| [GMCnet] FW: Engine & transmission oil coolers [message #281437] |
Sat, 04 July 2015 09:49  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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Gary. That extra 455 that came with Glenn's GMC. It had been remanufactured. I don't think that crankshaft had been cleaned properly. Because there was a very deep cut in # 3 rod bearing. All the way around the bearing. And it was interesting that the crank had no signs of damage. That groove lined up with that oil passage in the crank. I'll look to see if that bearing is still in that rod. If so. I could send a photo.This is the absolute truth so help me God. I really, really, really mean that. I bought a 74 GMC pickup with a 454 new to pull our camper.It started to have a light knock. It was out of it's 12,000 mile GM warranty. So I pulled it out. What I found was a broken drill bit still in the crankshaft. That passage was NOT completed. It got enough oil splash to last that long. This story is like saying I caught a shark in one of the Great Lakes. You can call Rob Bradley at 319-393-5754. He saw this. And to top this crazy story off. That 454 went 46,000 miles that
way. Steve Stone was the GMC rep in Chicago that got GMC to give me a crank, rod, and bearing. And GMC really didn't have to do that for me. Bob DunahughFrom: yenko108@hotmail.com
To: tkmiller714@yahoo.com
Subject: FW: Engine & transmission oil coolers
Date: Sat, 4 Jul 2015 00:07:54 -0500
From: yenko108@hotmail.com
To: gmclist@temp.gmcnet.org
Subject: RE: Engine & transmission oil coolers
Date: Fri, 3 Jul 2015 23:02:17 -0500
Jim Hupe is so right about, cleanliness is the next thing to godliness. When I assemble any engine. I do it in my shop that I keep my GMC in. It is vary sealed up with central heat, AC, and an air filtration system. Even a chandelier just for fun. And crown molding to complete the theme. I do the work on white paper. YES. I'm a nut on the cleanliness when I assemble an engine. Not to good the rest of the time. Right now it's a mess. HELP. Since the oil in the cooler HAS to go thrue the filter. So if you have the cooler cleaned the way Jay Leno suggest it be done. The filter should get anything that's missed by the cleaning of the cooler. And we should buy the smallest micron filter for the first few oil/filter changes. So most of the contamination in a reman'd engine has to be coming from improper cleaning of engine block oil passages. And the ones in the crankshaft. Plus working in a dirty environment. The problem is that a very small amount of contamination multipl
ies over time. Then exacerbated by the filter bypass valve. But then you have a finer oil filter that has colder fresh oil in it when the engine is at it's most vulnerable. Thus the bypass valve will be open the most. And the bearings in Glenn's GMC are indicating the story of deterioration over a very long time. There just has to be a passage in the 403, and 455 that holds trash, and is hard to clean. Is this what this is coming down too? Bob Dunahugh
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