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Old 01-07-2020, 10:33 AM   #21 (permalink)
legendman
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I would try slicing as much as I could with a razor blade, even if it meant taking the intake and whatever else off to get better access

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What your saying happened, should never be able to happen.
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I put a chevrolet tailgate on my last truck and it started acting like a girl...love me, need me, want me pay attention to me. Took it off and put the GMC back on (fixed the latch) and it went back to being the same old dirty bastard it used to be
~ Bob
1987 K20 5.7 TBI 700r4 np208
1990 C1500 5.7 700r4 Short stepside
1999 Chevrolet K2500 5.7L Auto
2006 Jetta TDI 5sp

Do yourself a favor and read the 6.2 Diesel Student Training Manual ... lots of good info...it's in PDF format located here >> PDF Manuals
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Old 02-06-2020, 07:14 PM   #22 (permalink)
BadDog
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This whole thing put a damper on my project about the same time I entered a run of birthdays for grandkids (and SIL) and other family stuff, so it got put on hold.

I finally got motivated to strip the top side down and remove that valve cover. Sadly, there was nothing at all suspicious in there other than what appeared to be a very minor scuffing on the back wall of the valve cover (at firewall). Nothing at all could be visually identified to explain the clacking.

On the up side, the upper lip of the valve cover was pretty bent by the time I got it free, but given it's going to get glued on again anyway, I suppose it's easy enough to straighten close and reuse. I never did find anything but import covers on ebay.

It was getting dark, so I put the cover back on and sealed the open bits just as I lost light and left it to await another day. As soon as I get a chance, I'll hook up some batteries and see what I can see with it running with the cover (and intake) off, but I'm not expecting a fortunate outcome.

At this point, I really fear my first thought may prove accurate. I'm not sure what a cracked piston sounds like in a diesel/6.2, and I initially rejected it anyway due to inexplicable dramatically intermittent nature. But if I can't identify something on top of the head, the only course I see is pulling the engine again, and dig in until I find something.

I hate going in blind. I always worry that I still won't identify a clear problem, and then where will I be. Probably doing a full rebuild anyway since I'll be in that deep anyway. But then, what if it does it again?

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Last edited by BadDog; 02-06-2020 at 07:16 PM.
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Old 02-10-2020, 04:42 AM   #23 (permalink)
Caldiesel1
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So I'm wondering if you access to a scope to look at the cylinders to maybe see if you have a crack in a piston but I also know I've had cracks you couldn't see without help. Sadly it seems like run it till it brakes or start taking it apart. I wish you luck. Keep us posted.
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Old Today, 02:25 AM   #24 (permalink)
redpepper
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Quote:
Originally Posted by BadDog View Post
This whole thing put a damper on my project about the same time I entered a run of birthdays for grandkids (and SIL) and other family stuff, so it got put on hold.

I finally got motivated to strip the top side down and remove that valve cover. Sadly, there was nothing at all suspicious in there other than what appeared to be a very minor scuffing on the back wall of the valve cover (at firewall). Nothing at all could be visually identified to explain the clacking.

On the up side, the upper lip of the valve cover was pretty bent by the time I got it free, but given it's going to get glued on again anyway, I suppose it's easy enough to straighten close and reuse. I never did find anything but import covers on ebay.

It was getting dark, so I put the cover back on and sealed the open bits just as I lost light and left it to await another day. As soon as I get a chance, I'll hook up some batteries and see what I can see with it running with the cover (and intake) off, but I'm not expecting a fortunate outcome.

At this point, I really fear my first thought may prove accurate. I'm not sure what a cracked piston sounds like in a diesel/6.2, and I initially rejected it anyway due to inexplicable dramatically intermittent nature. But if I can't identify something on top of the head, the only course I see is pulling the engine again, and dig in until I find something.

I hate going in blind. I always worry that I still won't identify a clear problem, and then where will I be. Probably doing a full rebuild anyway since I'll be in that deep anyway. But then, what if it does it again?
Hi had the same problem! but it ran well it
Turned out to be a crack in one off the valve rockers
Its split had fracture crack in it easy fix ! And cheap hopefully yours might be this
Does it go louder with revs ?

Sent from my SM-G965F using Tapatalk
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