540 Issues
holy crap yankey... I had no idea it was that bad... Are you going to pursue it in court?
02-22-2012 | 08:39 AM
#55
Registered
Joined: Jun 2009
Posts: 339
Likes: 0
From: League City, Tx
The burnt bearings are from having too tight of clearance on the bearings.
the little valleys that are ground into the oil galleys on the crank are to supply more oil to the bearings at high RPMs - they're good.
If those cam shafts are Comp Cams . . . they had lots of batches that went out that were not hardened correctly, and they would flake off, pit, and kill the rollers on the lifters. Yours look as if they're starting to do that also.
post #29 of the cam, pic # DSC00845 - that's a noticable dent in the cam lobe
Those lifter pics . . . the damage on them can come from the cam falling appart, and or too much or too little pre-load
the little valleys that are ground into the oil galleys on the crank are to supply more oil to the bearings at high RPMs - they're good.
If those cam shafts are Comp Cams . . . they had lots of batches that went out that were not hardened correctly, and they would flake off, pit, and kill the rollers on the lifters. Yours look as if they're starting to do that also.
post #29 of the cam, pic # DSC00845 - that's a noticable dent in the cam lobe
Those lifter pics . . . the damage on them can come from the cam falling appart, and or too much or too little pre-load
02-22-2012 | 08:58 AM
#56
Registered
Joined: Nov 2000
Posts: 709
Likes: 2
From: Grand Rapids Mi. U.S.
Seeing the cam and lifters it looks like there was a lack of a proper lubrication boundary/layer of oil, like the oil got real hot or pressure/flow at the actual mains/rods and cams was inadequate. As far as the oil reliefs, they look goofy, I wouldn't have ground them that way but its possible your engine builder has done it that way for years on other engines and it has worked. There wasn't a sale on recycled/reclaimed oil at advance auto was there??? (just kidding). I built a aluminum rodded motor for a jet boat I used to have years ago with no oil cooler and when my oil pressure dropped to 3 psi hot at idle and 20 lbs at wot brecause of the con rods growing from heat (didn't know that at the time I did it)my bearings and crank looked similar or worse in 20 hours, yours looks simila. What kind of oil pressure did you have hot at idle?? did you have a oil temp gauge, I would think your oil was 300+ degreees and not able to hardly carry any pressure hot if I was guessing.
02-22-2012 | 09:41 AM
#57
Registered
Joined: Oct 2007
Posts: 8,439
Likes: 93
From: yorkville,il
in a previous post i asked what brand of oil ,no response yet,also asked if gellner did these engines,again,no response,i have never seen a engine shop,s name on a crankshaft like that before,its pretty obvious who your engine guy is,so why are you not saying who built these engines?if a lawsuit ends up happening over this deal,im sure these pictures will be used as evidance.again i will ask,what does your engine builder have to say,as im sure you spoke with him before posting on oso.
02-22-2012 | 10:58 AM
#58
Registered
Joined: Feb 2005
Posts: 4,400
Likes: 25
From: Michigan
Calling you back with the real answers you are looking for (I think) - bearing clearances were .0025 on the rods and .0031 on the mains. Those were taken with a dial bore gauge and a micrometer.
Instead of using like an HX bearing - the bearing housing bores were oversized to: mains .0018 over and the rods were +.0008 over. Crank measured: mains 2.749 and rod journals 2.1998.
I do have oil temp and pressure gauges. 70 psi normal running. Oil temps were always around 185-190. I never ran the boat over 5000rpm.
Oil was changed 4 times in the 20 hrs - it never smelled burned, and there was no burnt oil smell when dismantling it.
I guess i need to ask - is this something I did wrong?
Instead of using like an HX bearing - the bearing housing bores were oversized to: mains .0018 over and the rods were +.0008 over. Crank measured: mains 2.749 and rod journals 2.1998.
I do have oil temp and pressure gauges. 70 psi normal running. Oil temps were always around 185-190. I never ran the boat over 5000rpm.
Oil was changed 4 times in the 20 hrs - it never smelled burned, and there was no burnt oil smell when dismantling it.
I guess i need to ask - is this something I did wrong?
My only question is where was the oil temp sensor? Maybe it was giving lower readings that what you were actually running?
02-22-2012 | 02:13 PM
#60
Thread Starter
Registered
Joined: Oct 2006
Posts: 364
Likes: 0
From: CHI-CA-GO
