Look What I found

durallymax

durallymax

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Apr 26, 2008
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Well turns out my tranny jack wasnt fixed and still has settling issues so NAPA is dropping a new one off tomorrow as per the jack companies warrenty policy.

But since that wasnt working and I had no other helpers today I just started tearing into the motor with it in the truck. Not as nice as having it out but suprisingly it wasnt too bad.

Once I got the drivers side head off I saw no signs of a cracked piston. But once I got the #2 piston up to TDC I saw that my rod was definately a little short. I put a straightedge over it and I could slip a .075" feeler gauge in the gap.

Below is a pic and also a pick of some markings I saw in the #6 cylinder wall that I was wondering about it lookes like a random scuffed area. Didnt remember seeing it before.


DSCN0242.jpg


DSCN0237.jpg
 
Josh2002cc

Josh2002cc

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Apr 2, 2007
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The lepord spots are normal, but is the brownish grey scuff marks normal? I didn't see that in my motor when I tore it apart.
 
Josh2002cc

Josh2002cc

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This is what my motor looked like, it has 343,xxx miles on it. Lepord spots are normal but I didn't have the brown scratches like you.
 

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JoshH

JoshH

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I think this is what he's talking about. Maybe rust?

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durallymax

durallymax

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thanks josh thats what i was referring too.

I know the leopard spots are normal. The black stain is just a run from the coolant mixing with the carbon ring and running down the wall.
 
RPM Motorsports

RPM Motorsports

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May 13, 2008
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Looks like minor rust from cleaning out the cylinder with brake clean or de greaser to me. I've seen it look similar When a block comes out of the wash, they change that color pretty quick if not sprayed down with some kind of oil.
 
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whitetrash21

whitetrash21

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Apr 29, 2008
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RPM Motorsports said:
Looks like minor rust from cleaning out the cylinder with brake clean or de greaser to me. I've seen it look similar When a block comes out of the wash, they change that color pretty quick if not sprayed down with some kind of oil.
Click to expand...


Sounds familiar. Had a 396 block do that to me. Hauled from machine shop to the house and already had rust building on cylinder walls and mains. 20 minute trip was all it took. I thought the same thing but it doesnt look consistent enough..... but what do I know.
 
LBZ

LBZ

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On the big diesels at work, I usually spray the cylinders down with wd-40 until assembly time and that seems to keep the walls from rusting. Then I clean them up good and lube them up with 15w40 before I throw the pistons in.

Is it just me, or can you still see the cross-hatching in that cylinder?
 
durallymax

durallymax

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1slow01Z71 said:
What is the deck height on these motors? I know on all the LS1s Ive built they were usually 8 thousandths out of the hole, but all the pics of seen of the dmax motors they seem to be at 0 deck height.
Click to expand...

The lowest the factory manual lists is .0088 for grade a gaskets and the highest is 14.8 for a non overbored block using grade c's

i didnt clean the walls with anything at all really the only fluid that touched it was some coolant but there wasnt any in that cylinder.
 
ripmf666

ripmf666

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LBZ said:
On the big diesels at work, I usually spray the cylinders down with wd-40 until assembly time and that seems to keep the walls from rusting. Then I clean them up good and lube them up with 15w40 before I throw the pistons in.

Is it just me, or can you still see the cross-hatching in that cylinder?
Click to expand...


I bet that smokes for awhile lol. Gm says to use oil but we have always used WD40 when installing the pistons.
 
LBZ

LBZ

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ripmf666 said:
I bet that smokes for awhile lol. Gm says to use oil but we have always used WD40 when installing the pistons.
Click to expand...

Actually surprisingly not much. The rings scrape most of the oil off when you slide them in. But a 2200 HP QSK50 Cummins smokes no matter what you do!:rofl:
 
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