Duramax Diesels Forum Truck of the Week
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Old 07-28-2009, 12:39 AM
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Default Anybody Identify this Engine Noise?

This is my new built engine that has 1200 miles on it. It started making a noise about the time we found we had a dud injector and its gradually getting worse. Any ideas? RH Side near No 5-7 seems the worst. We had a dud injector at No 7

http://s235.photobucket.com/albums/e...DSCF0002-1.flv
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Old 07-28-2009, 12:52 AM
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I cant say for sure but new injectors do make noise?even stockers

Think it could be that? Have you done a compression check ( always good for a base compraison

Im sure Mike has the rail at idle diald in? Hmm what else could it be?

balance rates are good? Smoke levels?
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Old 07-28-2009, 12:59 AM
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Doesnt seem as bad in the vid simon but when your sitting at the lights its embarrasing sometimes - a real knocking - balance rates are excellent
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Last edited by mick; 07-28-2009 at 01:00 AM.
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Old 07-28-2009, 01:01 AM
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shit mick my truck does the same thing...
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Old 07-28-2009, 05:12 AM
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If you take the boost tube of at the intake does it get noiser? You might just need to adjust valves.
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Old 07-28-2009, 04:07 PM
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Quote:
Originally Posted by paint94979 View Post
shit mick my truck does the same thing...
Your saying it may be NORMAL? By the way this engine is 15:1 CR
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Old 07-28-2009, 04:10 PM
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Quote:
Originally Posted by JOHNBOY View Post
If you take the boost tube of at the intake does it get noiser? You might just need to adjust valves.
As in how John? You talking about as in Tappet clearance? Or Springs?
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Old 07-28-2009, 04:41 PM
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When mine got noisy it was because of the Rocker Arm to bridge clearence on the exhuast valves was to high on one cylinder. With the intake boost tube off you could hear it poping back for lack of better description. Adjusted lash noise gone.
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Old 07-29-2009, 01:18 PM
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Thanks John. Ill have a look there today. Ive ordered a complete 7.1 from Guy that he says he will have to me around the end of August. Worst scenerio is we will have 2 engines. One for a race truck and one for my 04. but by the sound of this noise getting worse by the hour, I think we will have one engine for the 04 and one boat anchor
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Old 07-29-2009, 03:47 PM
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Mick

If you have open lash on exhuast valve it can and will make an evil noise. If it opens up enough the rocker bridge will fall off and it will sound even worse. Watch this video at the 2 min mark. The knock you hear is because the exhuast valves on cylinder number 1 was mot open hardly at all. It sounded horrible but was not as bad as it seemed.

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Old 07-30-2009, 08:06 AM
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holy jeez that's a scary sound.
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Old 07-30-2009, 08:35 AM
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whats the oil pressure?

I hunted a knocking noise on 02bigstrokins motor for weeks, swapped injectors, tunes checked valves. It ended up being the heater lines going into the cab were rattling against the firewall.
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Old 07-30-2009, 03:43 PM
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Quote:
Originally Posted by bullfrogjohnson View Post
whats the oil pressure?

I hunted a knocking noise on 02bigstrokins motor for weeks, swapped injectors, tunes checked valves. It ended up being the heater lines going into the cab were rattling against the firewall.
Oil Pressure is good Travis
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Old 07-30-2009, 04:11 PM
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Quote:
Originally Posted by JOHNBOY View Post
Mick

If you have open lash on exhuast valve it can and will make an evil noise. If it opens up enough the rocker bridge will fall off and it will sound even worse. Watch this video at the 2 min mark. The knock you hear is because the exhuast valves on cylinder number 1 was mot open hardly at all. It sounded horrible but was not as bad as it seemed.

Pulled the Rocker cover off rh side and nearly all the clearances were way over 12 thou. 2 were up at 18 in fact one bridge looked like it could have fallen out with a bit more gap. Will put it back together today but I am sceptical that it is the cause (Id like to hope so) I did notice by moving one pushrod around and up and down there was a definate noise coming from the lifter that I couldnt get from of any of the others?
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Old 07-30-2009, 09:02 PM
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Quote:
Originally Posted by mick View Post
Pulled the Rocker cover off rh side and nearly all the clearances were way over 12 thou. 2 were up at 18 in fact one bridge looked like it could have fallen out with a bit more gap. Will put it back together today but I am sceptical that it is the cause (Id like to hope so) I did notice by moving one pushrod around and up and down there was a definate noise coming from the lifter that I couldnt get from of any of the others?
Could your pushrods be bent or warped?
That sound would make me pee my pants, I've had something similar twice, only both times it was major. Talking about a heartbreak.
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