I don't "think" so. Noise was down low, from the oil pan. Pistons are stock replacement, cylinder decks were not machined, cylinder heads were machined 0.006", I am running Fel-Pro head gaskets. I don't think clearance was too close.
I am going to check the wrist pins, in a manner of speaking...
I will look closer.
Agreed. Though to be honest, if I don’t find anything soon, I am going to just pull the engine. It will go back on the engine stand to be completely disassembled.
And we will see what I did wrong.
Reassembly will include all new bearings, gaskets, and hardware.
#4 main cap lower bearing.
#4 main journal. Sorry for the poor quality. Me and the camera's auto focus were not getting along...
Tabs on rear seal plate overlapped #5 main bearing cap. No access.
I reinstalled the main caps with a smear of oil on the bearings, then hand tightened all...
I was able to get more work on my Escalade today.
I jacked up the front end again, lowered the steering rack, and removed the oil pan.
I removed main caps 1 through 4, one at a time. They all looked the same. Some wearing off of the tin plating, no scratches or grooving in the lower bearings...
Agreed. Once I finish checking the rockers and lifters for cylinders 6 and 8, then borescope the rest of the cylinders, I am going to pull the main caps one by one.
Understood.
Nope. No smoking gun. Just a list of things it is not.
I don't know what the cylinder finish is. My machinist bored...
The past two days have pretty much been a wash. Other responsibilities and rain have kept me away from my Escalade. However, I did get a brief chance to start to learn how to use my new borescope. I was able to look in cylinder #3 with the piston near BDC.
#3 cylinder walls and piston. I...
West 1: I do agree that the lifters were likely OK. However, I measured existing preload at 0.145". The Delphi LS7 lifters call for preload between 0.050" and 0.100". My OCD will not let me let that go. I will cheerfully purchase a new set of correct length pushrods.
Also, I agree that the...
‘New’ spark plugs with 100 miles on them. No smashed electrodes. Even burn on all them.
Looks a little white(lean) to me, though.
However, 50,000 mile spark plugs I pulled out of the driver's cylinder head when I started engine disassembly showed the same kind of burn.
Before the thunderstorms rained me out this afternoon, I got a little more work done.
I removed all 8 spark plugs. All were tight, came out smoothly, showed a good even burn(if a touch lean?). None of them had damaged electrodes.
More importantly, getting to #8 was only a minor pain in the...
I don't 'think' so. I replaced the crankshaft pulley with a new GM unit in December of 2023. This one seemed intact when I reinstalled it on the crankshaft after I installed the overhauled engine back into my Escalade in April.
I can remove the serpentine belt and get a feel on the pulley...
Agreed. If and when I don't find anything in the valve train, I will pull the timing cover for a look see. While I had the oil pan off, I tried looking up into the timing cover. Oil pump was in the way.
However...my new articulated borescope arrived today. For giggles, I may try to snake it up...
Thank you! I do this like I mean it!
Yeah. Nature of the beast for the kind of luck I have. Had I just slapped it back together with a new cam and lifters, the engine likely would have run just fine. ;) Tried to do it right, though...
I WILL figure out what is wrong. I will gladly through...
I did not. With the air intake ducting still in place, I didn't have good access for the stethoscope probe. I didn't think to remove the serpentine belt. However, I don't recall any general noise from the timing cover area.
I did check my assembly photos and verified I DID remove the locking...
I agree. However, my measured preload of approximately 0.145" is out of the recommended spec for the Delphi LS7 lifters. I am going to fix that.
There was no miss of any kind. Engine ran quite smoothly.
Understood. For the moment, I am cranking it over by hand. The starter is off the engine...
That is definitely a concern! Cam bearings were replaced with new coated Durabond bearings. Camshaft installed tight and smooth into them.
However...if I don't find anything in the lifters, or if I do, next step is removing the engine again and hanging it on my engine stand. Deeper surgery...
#1 cylinder intake and exhaust rocker arms.
Passenger’s side valve train.
MM 7.400” pushrod, adjustable pushrod set to 7.325”, and the calipers I used for all this.
This weekend, I have done the following:
-inspected both catalytic converter pipe flanges to the exhaust manifolds. All nuts were tight, flange gaps were tight and even. I saw no soot or evidence of exhaust leakage.
-inspected top and bottom of both exhaust manifolds. There were no gaps between...
I agree. Thanks for the confidence!
Crank was ground 0.010" under on both the rods and mains. Matching 0.010" under King bearings were installed. I checked clearances with plastigauge during assembly. Approximately 0.0025" on the mains and approximately 0.0015" on rods.
Before the overhaul...
All 8 rod cap bearings and crankshaft journals looked like this. Yes, there are minor scratches.
However, not the carnage of a rod bearing coming apart.
Here is what happened:
I was set up to start the engine. Prelubed oil system again, checked all fluids, hot battery, etc...
Tried to download the new L9H tune from Blackbear to the ECM. My Autocal V3 unit died. Had to start the engine on the L94/DOD turned off tune that was already in the ECM...
Understood. I should have clarified that I was trying to determine if the noise was crankshaft speed or camshaft speed.
I have checked the undersides of both exhaust manifolds, no gaps between the manifolds and cylinder heads. I had the manifold faces surfaced. Gaskets are intact, no signs of...
Sigh...I'm back. I have not posted recently because this project has gone wrong. I have been sulking and trying to figure out what went wrong.
In a nutshell, the overhauled engine has developed a noise and the overhauled transmission bucks and runs hot.
Right now, I am concentrating on the...
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