I posted this in the lounge so I could put up a pic . making easier to understand . I just recently took apart a engine that was having major thrust bearing problems since day one when I bought this block from a board member that had 3 billet caps installed . upon inspection I notice what looks like the front of the blocks thrust face has been machined for some reason (you can actualy see the marks from the cutter they used ) . I've seen a few blocks (lined bored , untouched) and have never seen anything like this before . what would be the reason that a shop would machine the thrust face on a block ? thanks . any feed back will be welcomed . I hate to trash a std bore block if it can not be corrected .
Block machine question .
- Thread starter KWIKR 1
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Ken Mosher I think it was posted a long article on thrust bearing failure, and I think I remember reading something about one of the causes of thrust failure was the fact oil cant sit on the vertical bearing surface and float the pieces. I believe it went on to mention taking both surfaces slightly out of parallel and cutting oil grooves into the ends of the bearing shells. This allowed some oil to drip into the thrust surface and helped with thrust wear.
I dont even remember where it was posted, maybe t6p? But you might wanna search for it as it was an excellent article, even if I dont remember it all
Another cause of thrust failure is balooning of the converter. I have seen people simply put flat a washer or 2 between the converter and flywheel which gives the belly of the converter a little room to grow without pushing the crank fwd. Also, running too high trans pressures will do this...etc...etc..
Which side of the thrust bearing it wearing?
I dont even remember where it was posted, maybe t6p? But you might wanna search for it as it was an excellent article, even if I dont remember it all
Another cause of thrust failure is balooning of the converter. I have seen people simply put flat a washer or 2 between the converter and flywheel which gives the belly of the converter a little room to grow without pushing the crank fwd. Also, running too high trans pressures will do this...etc...etc..
Which side of the thrust bearing it wearing?
Jim I've read every article ever printed about thrust bearing failure .
I've also tried that thurst bearing mod as well after the first failure . but , did not help . after first failure , TC was cut opened and inspected , trans pump send out inspected and rebuild . trans pressures checked done on cooler lines and trans (checked out fine). Flexplate checked out, Crank was removed and inspected/polished as well . after second failure trans was completely rebuild and a completely different brand new converter was installed stab distance on all converters were checked each time.Tried different methods of "setting" the crankshaft endplay . Put in extra ground straps on the engine and trans (articles mention about being ground related). after the third failure I pulled the engine . backside of bearing is where the problem is . very rapid wear .I think it is related to the machine work done on the blocks thrust face . it was done for a reason . to componsate for something that was out of wack with the line bore/billet caps . why else would that be done ??? I've seen a few blocks and have never seen or heard of that machine work done before . I'm just trying to figure it out before a throw the block into a dumpster . two different shops did line bores on this block before I purchased it . the second one was to correct the first shops screw up .
