I am brand new to the forum and I have searched for this answer and I have not found a minimum spec for the situation I am currently faced with. I took on the job of a true basket case. I am working on a 2005 C4500. The engine had approximately 72000 miles and it apparently blew a head gasket. Was pushing compression into cooling system. The owner of the truck hired a mechanic to repair this vehicle and he got it all apart and sent heads to an unreliable machine shop in my opinion. The gentleman that was working on the truck got the heads and valve train and covers back on and got sick and was diagnosed with cancer and unfortunately passed away. The owner of the truck was desperately looking for someone that would finish the job. I accepted under the condition I would not stand behind any of the work done prior to me. He agreed and the truck came to me in many boxes. Got the engine and truck all back together and no left over parts. Problem is that I could hear an noise in the top end of the engine and started doing more research and found valves were at .008 approximately and questioned machine shop into how much material was removed not real sure. I am concerned that the valves are not recessed enough and the valves are hitting the pistons. Removed one head and using a straight edge and feeler gauges I am approximately .015 on intake and .025 on exhaust. I think from what aim finding that is to close. Sorry for the long post but I wanted to include all information that is applicable. Pleas help. I am bringing home a depth micrometer tomorrow to get a closer measurement. Thanks
Valves Recession
- Thread starter Dozer1980
- Start date
Take valves out and mill the face.
They are usually just .005" above the head.
I think the spec you want does not exist because the heads are not to be resurfaced.
You could also use grade c head gaskets they are the thickest.
Or you could measure piston potrusion.
If the valves were hitting there should be a mark. Put playdough on top piston and turn it over with head on is another option.
Sent from my SPH-L300 using Tapatalk
They are usually just .005" above the head.
I think the spec you want does not exist because the heads are not to be resurfaced.
You could also use grade c head gaskets they are the thickest.
Or you could measure piston potrusion.
If the valves were hitting there should be a mark. Put playdough on top piston and turn it over with head on is another option.
Sent from my SPH-L300 using Tapatalk
The valves will be recessed more after a valve job, to be expected. NOT the source in of itself. If anything, it will create more clearance for the valves. Use clay or poly or whatever and check the valve clearances then get back to us.
I am not totally sure but I think he was saying that the heads were milled but the valve seats were not touched.
You would know better than me but the only spec I could find was installed height for the valves and valve guide wear.
That is correct the head was milled but the valves have not been touched. The guy at the machine shop has no record of what was removed from the head but he is sure he did not do anything to the valves. I have both heads off now and I do not see any marks on the pistons or valves but the head gaskets were installed backwards from side to side. They were felpro gaskets and measure approx. .039-.040 thick
So the valves are protruding 0.015" above the head surface? Regardless, the only real way to tell is to actually check the clearance with clay or poly. The stock cam leaves lots of room for clearance, I just don't know how much.
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2004 Chevrolet Chevy K Silverado - 4WD | Sierra, Silverado (VIN C/K) Service Manual | Engine | Engine Mechanical - 6.6L (LB7) | Specifications | Document ID: 827716 <HR>
Engine Mechanical Specifications
<TABLE border=1 width="95%"><TBODY><TR><TH vAlign=bottom rowSpan=2 align=middle>Application
</TH><TH vAlign=center colSpan=2 align=middle>Specification
</TH></TR><TR><TH vAlign=center align=middle>Metric
</TH><TH vAlign=center align=middle>English
</TH></TR><TR><TD vAlign=top colSpan=3 align=left>General
</TD></TR><TR><TD vAlign=top align=left>
- Engine Type
</TD></TR><TR><TD vAlign=top align=left>
- Displacement
</TD><TD vAlign=center align=middle>402 cu in
</TD></TR><TR><TD>
- RPO
</TD></TR><TR><TD>
- Bore
</TD><TD vAlign=center align=middle>4.0551 in
</TD></TR><TR><TD>
- Stroke
</TD><TD vAlign=center align=middle>3.8976 in
</TD></TR><TR><TD>
- Compression Ratio
</TD></TR><TR><TD>
- Engine Compression Test - Minimum
</TD><TD vAlign=center align=middle>300 psi
</TD></TR><TR><TD vAlign=top align=left>
- Idle Speed
</TD></TR><TR><TD>
- Firing Order
</TD></TR><TR><TD colSpan=3>Block
</TD></TR><TR><TD>
- Cylinder Bore Diameter - Service Limits
</TD><TD vAlign=center align=middle>4.0594 in
</TD></TR><TR><TD vAlign=top align=left>
- Cylinder Bore Diameter - Production Value
</TD><TD>4.0551-4.0557 in
</TD></TR><TR><TD vAlign=top align=left>
- Cylinder Bore Out-of-Round - Production Value
</TD><TD vAlign=center align=middle>0.0006 in
</TD></TR><TR><TD vAlign=top align=left>
- Cylinder Bore Taper - Production Value
</TD><TD vAlign=center align=middle>0.0006 in
</TD></TR><TR><TD vAlign=top colSpan=3 align=left>Camshaft
</TD></TR><TR><TD vAlign=top align=left>
- Camshaft Bearing Inside Diameter - Service Limit
</TD><TD vAlign=center align=middle>2.4043 in
</TD></TR><TR><TD vAlign=top align=left>
- Camshaft Bearing Inside Diameter - Production Value
</TD><TD vAlign=center align=middle>2.4016-2.4028 in
</TD></TR><TR><TD vAlign=top align=left>
- Camshaft End Play - Service Limit
</TD><TD vAlign=center align=middle>0.0079 in
</TD></TR><TR><TD vAlign=top align=left>
- Camshaft Journal Diameter - Service Limit
</TD><TD vAlign=center align=middle>2.3984 in
</TD></TR><TR><TD vAlign=top align=left>
- Camshaft Journal Diameter - Production Value
</TD><TD vAlign=center align=middle>2.3990-2.4001 in
</TD></TR><TR><TD vAlign=top align=left>
- Camshaft Lobe Lift - Exhuast - Production Value
</TD><TD vAlign=center>0.2326 in
</TD></TR><TR><TD vAlign=top align=left>
- Camshaft Lobe Lift - Intake - Production Value
</TD><TD vAlign=center align=middle>0.2863 in
</TD></TR><TR><TD vAlign=top align=left>
- Camshaft Runout - Service Limit
</TD><TD vAlign=center align=middle>0.0020 in
</TD></TR><TR><TD colSpan=3>Cooling System
</TD></TR><TR><TD vAlign=top align=left>
- Capacity @ Engine RPM
</TD></TR><TR><TD vAlign=top align=left>
- Thermostat Full Open Temperature
</TD><TD vAlign=center align=middle>230 degrees F
</TD></TR><TR><TD vAlign=top align=left>
- Turbocharger Coolant Bypass Valve
</TD><TD vAlign=center align=middle>140 degrees F
</TD></TR><TR><TD colSpan=3>Connecting Rod
</TD></TR><TR><TD vAlign=top align=left>
- Connecting Rod Bearing Clearance - Service Limit
</TD><TD vAlign=center align=middle>0.0039 in
</TD></TR><TR><TD vAlign=top align=left>
- Connecting Rod Bearing Clearance - Production Value
</TD><TD vAlign=center align=middle>0.0014-0.0030 in
</TD></TR><TR><TD vAlign=top align=left>
- Connecting Rod Bore Diameter - Bearing End - Production Value
</TD><TD vAlign=center align=middle>2.4789-2.4795 in
</TD></TR><TR><TD vAlign=top align=left>
- Connecting Rod Bore Diameter - Pin End - Service Limit
</TD><TD vAlign=center align=middle>1.3594 in
</TD></TR><TR><TD vAlign=top align=left>
- Connecting Rod Bore Diameter - Pin End - Production Value
</TD><TD vAlign=center align=middle>1.3587-1.3591 in
</TD></TR><TR><TD vAlign=top align=left>
- Connecting Rod Length
</TD><TD vAlign=center align=middle>6.42 in
</TD></TR><TR><TD vAlign=top align=left>
- Connecting Rod Side Clearance - Service Limit
</TD><TD vAlign=center align=middle>0.0213 in
</TD></TR><TR><TD>
- Connecting Rod Side Clearance - Production Value
</TD><TD vAlign=center align=middle>0.0122-0.0193 in
</TD></TR><TR><TD vAlign=top colSpan=3 align=left>Crankshaft
</TD></TR><TR><TD vAlign=top align=left>
- Connecting Rod Journal Diameter - Service Limit
</TD><TD vAlign=center align=middle>2.4756 in
</TD></TR><TR><TD vAlign=top align=left>
- Connecting Rod Journal Diameter - Production Value
</TD><TD vAlign=center align=middle>2.4764-2.4772 in
</TD></TR><TR><TD vAlign=top align=left>
- Crankshaft End Play - Service Limit
</TD><TD vAlign=center align=middle>0.0213 in
</TD></TR><TR><TD vAlign=top align=left>
- Crankshaft End Play - Production Value
</TD><TD vAlign=center align=middle>0.0016-0.0081 in
</TD></TR><TR><TD vAlign=top align=left>
- Crankshaft Main Bearing Clearance - Service Limit
</TD><TD vAlign=center align=middle>0.0055 in
</TD></TR><TR><TD vAlign=top align=left>
- Crankshaft Main Bearing Clearance - Production Value
</TD><TD vAlign=center align=middle>0.0015-0.0028 in
</TD></TR><TR><TD vAlign=top align=left>
- Crankshaft Main Journal Diameter - Service Limit
</TD><TD>3.1453 in
</TD></TR><TR><TD vAlign=top align=left>
- Crankshaft Main Journal Diameter - Production Value
</TD><TD vAlign=center align=middle>3.1459-3.1466 in
</TD></TR><TR><TD vAlign=top align=left>
- Crankshaft Runout - Service Limit
</TD><TD vAlign=center align=middle>0.0173 in
</TD></TR><TR><TD vAlign=top align=left>
- Crankshaft Runout - Production Value
</TD><TD vAlign=center align=middle>0.0020 in
</TD></TR><TR><TD colSpan=3>Cylinder Head
</TD></TR><TR><TD vAlign=top align=left>
- Surface Flatness - Block Deck - Service Limit
</TD><TD vAlign=center align=middle>0.0079 in
</TD></TR><TR><TD vAlign=top align=left>
- Surface Flatness - Block Deck - Production Value
</TD><TD vAlign=center align=middle>0.0030 in
</TD></TR><TR><TD vAlign=top align=left>
- Surface Flatness - Exhaust Manifold Deck - Production Value
</TD><TD vAlign=center align=middle>0.0039 in
</TD></TR><TR><TD vAlign=top align=left>
- Surface Flatness - Intake Manifold Deck - Production Value
</TD><TD vAlign=center align=middle>0.0039 in
</TD></TR><TR><TD colSpan=3>Exhaust Manifold
</TD></TR><TR><TD vAlign=top align=left>
- Surface Flatness- Production Value
</TD><TD vAlign=center align=middle>0.0118 in
</TD></TR><TR><TD colSpan=3>Intake Manifold
</TD></TR><TR><TD vAlign=top align=left>
- Surface Flatness - Production Value
</TD><TD vAlign=center align=middle>0.0118 in
</TD></TR><TR><TD colSpan=3>Lubrication System
</TD></TR><TR><TD vAlign=top align=left>
- Oil Capacity - with Filter
</TD><TD vAlign=center align=middle>9.5 L
</TD></TR><TR><TD>
- Oil Capacity - without Filter
</TD><TD vAlign=center align=middle>8.7 L
</TD></TR><TR><TD>
- Oil Pressure - Minimum- Hot - at idle
</TD><TD vAlign=center align=middle>14 psi
</TD></TR><TR><TD>
- Oil Pressure - Minimum - 1800 RPM
</TD><TD vAlign=center align=middle>42 psi
</TD></TR><TR><TD>
- Oil Relief Valve Opening Pressure
</TD><TD vAlign=center align=middle>64 psi
</TD></TR><TR><TD>
- Piston Cooling Jet Valve Opening Pressure
</TD><TD vAlign=center align=middle>29 psi
</TD></TR><TR><TD vAlign=top colSpan=3 align=left>Oil Pump
</TD></TR><TR><TD vAlign=top align=left>
- Gear Shaft Outside Diameter - Drive - Service Limit
</TD><TD vAlign=center align=middle>0.7819 in
</TD></TR><TR><TD vAlign=top align=left>
- Gear Shaft Outside Diameter - Drive - Production Value
</TD><TD vAlign=center align=middle>0.7853-0.7858 in
</TD></TR><TR><TD vAlign=top align=left>
- Gear Shaft Outside Diameter - Driven - Service Limit
</TD><TD vAlign=center align=middle>0.7819 in
</TD></TR><TR><TD>
- Gear Shaft Outside Diameter - Driven - Production Value
</TD><TD vAlign=center align=middle>0.7853-0.7858 in
</TD></TR><TR><TD>
- Gear Shaft-to-Bushing - Service Limit Clearance
</TD><TD vAlign=center align=middle>0.0055 in
</TD></TR><TR><TD>
- Gear-to-Cover Clearance - Drive/Driven - Service Limit
</TD><TD vAlign=center align=middle>0.0043 in
</TD></TR><TR><TD>
- Gear-to-Cover Clearance - Drive/Driven - Production Value
</TD><TD vAlign=center align=middle>0.0025-0.0043 in
</TD></TR><TR><TD>
- Gear-to-Housing Clearance - Drive/Driven - Service Limit
</TD><TD vAlign=center align=middle>0.0087 in
</TD></TR><TR><TD>
- Gear-to-Housing Clearance - Drive/Driven - Production Value
</TD><TD vAlign=center align=middle>0.0049-0.0087 in
</TD></TR><TR><TD vAlign=top colSpan=3 align=left>Piston Rings
</TD></TR><TR><TD vAlign=top align=left>
- Piston Ring End Gap-First Compression Ring - Service Limit
</TD><TD vAlign=center align=middle>0.0539 in
</TD></TR><TR><TD vAlign=top align=left>
- Piston Ring End Gap-First Compression Ring - Production Value
</TD><TD vAlign=center align=middle>0.0118-0.0177 in
</TD></TR><TR><TD vAlign=top align=left>
- Piston Ring End Gap-Second Compression Ring - Service Limit
</TD><TD vAlign=center align=middle>0.0531 in
</TD></TR><TR><TD vAlign=top align=left>
- Piston Ring End Gap-Second Compression Ring - Production Value
</TD><TD vAlign=center align=middle>0.0197-0.0256 in
</TD></TR><TR><TD vAlign=top align=left>
- Piston Ring End Gap-Oil Control Ring - Service Limit
</TD><TD vAlign=center align=middle>0.0472 in
</TD></TR><TR><TD vAlign=top align=left>
- Piston Ring End Gap-Oil Control Ring - Production Value
</TD><TD vAlign=center align=middle>0.0059-0.0138 in
</TD></TR><TR><TD vAlign=top align=left>
- Piston Ring to Groove Clearance-First Compression Ring - Service Limit
</TD><TD vAlign=center align=middle>0.0102 in
</TD></TR><TR><TD vAlign=top align=left>
- Piston Ring to Groove Clearance-First Compression Ring - Production Value
</TD><TD vAlign=center align=middle>0.0030-0.0067 in
</TD></TR><TR><TD vAlign=top align=left>
- Piston Ring to Groove Clearance-Second Compression Ring - Service Limit
</TD><TD vAlign=center align=middle>0.0039 in
</TD></TR><TR><TD vAlign=top align=left>
- Piston Ring to Groove Clearance-Second Compression Ring - Production Value
</TD><TD vAlign=center align=middle>0.0004-0.0012 in
</TD></TR><TR><TD vAlign=top align=left>
- Piston Ring to Groove Clearance-Oil Control Ring - Service Limit
</TD><TD vAlign=center align=middle>0.0047 in
</TD></TR><TR><TD vAlign=top align=left>
- Piston Ring to Groove Clearance-Oil Control Ring - Production Value
</TD><TD vAlign=center align=middle>0.0004-0.0012 in
</TD></TR><TR><TD vAlign=top colSpan=3 align=left>Pistons and Pins
</TD></TR><TR><TD vAlign=top align=left>
- Piston-Piston Diameter
</TD><TD>4.0531-4.0535 in
</TD></TR><TR><TD vAlign=top align=left>
- Piston-Piston Pin Bore Diameter
</TD><TD>1.3584-1.3587 in
</TD></TR><TR><TD vAlign=top align=left>
- Pin-Piston Pin Clearance to Piston Pin Bore - Service Limit
</TD><TD vAlign=center align=middle>0.0007 in
</TD></TR><TR><TD vAlign=top align=left>
- Pin-Piston Pin Clearance to Piston Pin Bore - Production Value
</TD><TD vAlign=center align=middle>0.0002-0.0007 in
</TD></TR><TR><TD vAlign=top align=left>
- Pin-Piston Pin Diameter - Service Limit
</TD><TD vAlign=center align=middle>1.3563 in
</TD></TR><TR><TD vAlign=top align=left>
- Pin-Piston Pin Diameter - Production Value
</TD><TD vAlign=center align=middle>1.3581-1.3583 in
</TD></TR><TR><TD colSpan=3>Starter
</TD></TR><TR><TD vAlign=top align=left>
- Rated Output
</TD></TR><TR><TD colSpan=3>Turbocharger
</TD></TR><TR><TD vAlign=top align=left>
- Axial Play
</TD><TD vAlign=center align=middle>0.0043 in
</TD></TR><TR><TD vAlign=top align=left>
- Radial Play
</TD><TD vAlign=center align=middle>0.0079 in
</TD></TR><TR><TD colSpan=3>Valve System
</TD></TR><TR><TD vAlign=top align=left>
- Valves-Valve Face Angle - Production Value
</TD></TR><TR><TD vAlign=top align=left>
- Valves-Valve Face Runout
</TD><TD vAlign=center align=middle>--
</TD></TR><TR><TD vAlign=top align=left>
- Valves-Valve Face Width - Service Limit
</TD><TD vAlign=center align=middle>0.0984 in
</TD></TR><TR><TD vAlign=top align=left>
- Valves-Valve Face Width - Production Value
</TD><TD vAlign=center align=middle>0.0827 in
</TD></TR><TR><TD vAlign=top align=left>
- Valves-Valve Head Diameter - Exhaust
</TD><TD vAlign=center align=middle>1.22 in
</TD></TR><TR><TD vAlign=top align=left>
- Valves-Valve Head Diameter - Intake
</TD><TD vAlign=center align=middle>1.30 in
</TD></TR><TR><TD vAlign=top align=left>
- Valves-Valve Seat Angle
</TD></TR><TR><TD vAlign=top align=left>
- Valves-Valve Stem Diameter
</TD><TD vAlign=center align=middle>0.28 in
</TD></TR><TR><TD vAlign=top align=left>
- Valves-Valve Stem Oil Seal Installed Height
</TD><TD vAlign=center align=middle>0.2382 in
</TD></TR><TR><TD vAlign=top align=left>
- Valves-Valve Stem-to-Guide Clearance - Service Limit
</TD><TD vAlign=center align=middle>0.0079 in
</TD></TR><TR><TD vAlign=top align=left>
- Valves-Valve Stem-to-Guide Clearance - Exhaust - Production Value
</TD><TD vAlign=center align=middle>0.0015-0.0028 in
</TD></TR><TR><TD vAlign=top align=left>
- Valves-Valve Stem-to-Guide Clearance - Intake - Production Value
</TD><TD vAlign=center align=middle>0.0012-0.0025 in
</TD></TR><TR><TD>
- Valves-Valve Stem-to-Guide Clearance
</TD><TD vAlign=center align=middle>0.0079 in
</TD></TR><TR><TD vAlign=top align=left>
- Valve Lifters/Push Rods-Push Rod Straightness
</TD><TD vAlign=center align=middle>0.0315 in
</TD></TR><TR><TD vAlign=top align=left>
- Rocker Arms-Valve Rocker Arm Bore Diameter
</TD><TD vAlign=center align=middle>0.8665-0.8675 in
</TD></TR><TR><TD vAlign=top align=left>
- Rocker Arms-Valve Rocker Arm Bore-to-Shaft Clearance - Service Limit
</TD><TD vAlign=center align=middle>0.0079 in
</TD></TR><TR><TD vAlign=top align=left>
- Rocker Arms-Valve Rocker Arm Bore-to-Shaft Clearance - Production Value
</TD><TD vAlign=center align=middle>0.0004-0.0022 in
</TD></TR><TR><TD vAlign=top align=left>
- Rocker Arms-Valve Rocker Arm Ratio - Exhaust
</TD></TR><TR><TD vAlign=top align=left>
- Rocker Arms-Valve Rocker Arm Ratio - Intake
</TD></TR><TR><TD vAlign=top align=left>
- Rocker Arms-Valve Rocker Arm Shaft Diameter - Service Limit
</TD><TD vAlign=center align=middle>0.8602 in
</TD></TR><TR><TD vAlign=top align=left>
- Rocker Arms-Valve Rocker Arm Shaft Diameter - Production Value
</TD><TD vAlign=center align=middle>0.8653-0.8661 in
</TD></TR><TR><TD vAlign=top align=left>
- Valve Springs-Valve Spring Free Length - Production Value
</TD><TD vAlign=center align=middle>2.2283 in
</TD></TR><TR><TD vAlign=top align=left>
- Valve Springs-Valve Spring Installed Height - Production Value
</TD><TD vAlign=center align=middle>1.6142 in
</TD></TR><TR><TD vAlign=top align=left>
- Valve Springs-Valve Spring Load - Exhaust - Service Limit
</TD><TD vAlign=center align=middle>61.8 lb at 1.61 in
</TD></TR><TR><TD vAlign=top align=left>
- Valve Springs-Valve Spring load - Exhaust - Production Value
</TD><TD vAlign=center align=middle>71-81.6 lb at 1.61 in
</TD></TR><TR><TD vAlign=top align=left>
- Valve Springs-Valve Spring Load - Intake - Service Limit
</TD><TD vAlign=center align=middle>68.8 lb at 1.61 in
</TD></TR><TR><TD vAlign=top align=left>
- Valve Springs-Valve Spring Load - Intake - Production Value
</TD><TD vAlign=center align=middle>71-81.6 lb at 1.61 in
</TD></TR></TBODY></TABLE>
© 2008 General Motors Corporation. All rights reserved.
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2001 Chevrolet Chevy K Silverado - 4WD | Sierra, Silverado, Suburban, Tahoe, Yukon (VIN C/K) Service Manual | Engine | Engine Mechanical - 6.6L | Repair Instructions | Document ID: 1651925 <HR>
Cylinder Head Cleaning and Inspection
Special Tools
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>J 9666 Valve Spring Tester</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>EN-47909 Injector Bore and Sleeve Cleaning Kit</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top> • </TD><TD vAlign=top>EN-47909 Injector Bore and Sleeve Cleaning Kit</TD></TR></TBODY></TABLE>
<LI type=1>Clean the cylinder head of all foreign material. Do not use a motorized wire brush on any gasket sealing surface. <LI type=1>Clean the threaded holes. <LI type=1>Clean the injector bores using EN-47909 . <LI type=1>Inspect the cylinder head for the following:<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Damage to the gasket surfaces</TD></TR></TBODY></TABLE><LI type=1>Measure the cylinder head for warpage with a straight edge and a feeler gauge. A cylinder head block deck with warpage in excess of 0.1 mm (0.0039 in) must be replaced.
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Damage to the threaded bolt holes</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Cracks in the exhaust ports</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>External cracks in the water chamber</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Cracks between the valve seats</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Restrictions in the intake or exhaust passages</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Restrictions in the cooling system passages</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Rusted, damaged or leaking core plugs</TD></TR></TBODY></TABLE>
<LI type=1>Measure the cylinder head exhaust manifold deck for warpage. A cylinder head exhaust manifold deck with warpage in excess of 0.1 mm (0.0039 in) within a 453 mm (17.83 in) area must be replaced.
<LI type=1>Measure the cylinder head intake manifold deck for warpage. A cylinder head intake manifold deck with warpage in excess of 0.3 mm (0.011 in) within a 493 mm (19.41 in) area must be replaced.
<LI type=1>Measure the valve spring tension using J 9666 . Replace the valve spring if the valve spring tension is less than 275 N (61.8 lb) at 41 mm (1.6142 in)
<LI type=1>Measure the valve spring for squareness. Replace the valve spring if squareness is beyond 2.0 mm (0.0787 in).
<LI type=1>Measure the valve spring free length. The production free length is 56.6 mm (2.2283 in). <LI type=1>Measure the valve stem to guide clearance.<TABLE border=0><TBODY><TR><TD vAlign=top>11.1. </TD><TD vAlign=top>Set a dial indicator to the valve stem measuring point.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>11.2. </TD><TD vAlign=top>Move the valve stem from side to side while reading the total movement on the dial indicator. If the measured valve exceeds 0.20 mm (0.0079 in), replace the cylinder head.</TD></TR></TBODY></TABLE>
<LI type=1>If the valve stem to guide clearance is over 0.25 mm (0.098 in) for the exhaust valve guides or 0.20 mm (0.0079 in) for the intake valve guides, the cylinder head must be replaced. <LI type=1>Inspect the valves for the following:<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Bent valve stem</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Scored valve stem</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Worn valve key grooves</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Pitted surfaces</TD></TR></TBODY></TABLE>
<LI type=1>Measure the valve margin. The intake valve production margin is 1.2 mm (0.0472 in) and the service limit is 0.88 mm (0.0346 in). The exhaust valve production margin is 1.0 mm (0.0394 in) and the service limit is 0.73 mm (0.0287 in). Replace the valve if the valve margin is below the service limit.
<LI type=1>Measure the valve depression.<TABLE border=0><TBODY><TR><TD vAlign=top>15.1. </TD><TD vAlign=top>Insert a new valve into the cylinder head (1).</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>15.2. </TD><TD vAlign=top>Use a depth gage or a straight edge to measure the valve depression from the cylinder head gasket surface (2). The intake valve depression is 0.6 mm (0.0236 in) and the service limit is 2.5 mm (0.0984 in). The exhaust valve depression is 0.9 mm (0.0354 in) and the service limit is 2.0 mm (0.0787 in). Recondition the valve seat if the valve depression is above specifications.</TD></TR></TBODY></TABLE>
- Measure the valve contact width. <TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Inspect the valve contact area for roughness or unevenness.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The intake valve contact width is 2.1 mm (0.0827 in) and the service limit is 2.5 mm (0.0984 in).</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The exhaust valve contact width is 2.1 mm (0.0827 in) and the service limit is 2.5 mm (0.0984 in).</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Recondition the valve seats to bring the contact width into specifications.</TD></TR></TBODY></TABLE>
</FORM>
Rule of thumb is what ever is take off the heads you set the valves back into the seats the same amount.
http://www.duramaxdiesels.com/forum/showthread.php?t=15732
http://www.duramaxdiesels.com/forum/showthread.php?t=6136
http://www.duramaxdiesels.com/forum/showthread.php?t=15732
http://www.duramaxdiesels.com/forum/showthread.php?t=6136
Are rockers or upper valvetrain dry from lack of oil?
Maybe backwards gaskets blocked a passage.
Idk because I never tried flippin gaskets lol
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So then that would cause overheating, the op did not mention overheating, but if the heads were dry of coolant yet the coolant was still circulating in the block but not the head would the ect actually read hot?
Could the heads be getting hot enough to make a popping sound?
I say it would be best to have the heads redone at the machine shop and checked due to poor coolant flow.
If the heads were overheated plan on injector problems as well.
The heads are the heat sink to cool injectors.
hopefully it is all fine
good luck
We'll I think we got it figured out. Got the heads to the machine shop and he thought to check for a bad valve guide and found the rearmost valve wouldn't open. Found that valve was bent. Figuring that the head must have been dropped before it was put together by the other mechanic and it landed on the valve stem and it was bent. Thinking the noise came from the good valve opening while the valve bridge acted as a fulcrum from good valve to the bad valve.