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so i just finished the mock up of 5.3 /7875 turbo( jy 05 L59, 146 k) in my 56 chevy. tonight i pulled it out for final tear down and clean up. i was originally going to do the head gasket, studs, sloppy jegs cam, btr springs , and run it....
well when i pulled the cam i found this....couple of the last few lobes wiped out on the cam. any one had one like this?
is it a few bad lifters or due to a low oil pressure situation?
i had no intentions of taking the lower end apart....looks like im gonna have to now...
so i just finished the mock up of 5.3 /7875 turbo( jy 05 L59, 146 k) in my 56 chevy. tonight i pulled it out for final tear down and clean up. i was originally going to do the head gasket, studs, sloppy jegs cam, btr springs , and run it....
well when i pulled the cam i found this....couple of the last few lobes wiped out on the cam. any one had one like this?
is it a few bad lifters or due to a low oil pressure situation?
i had no intentions of taking the lower end apart....looks like im gonna have to now...
Could be bad springs, looks like the lifters were jumping around on the lobes.
You were going to pull the heads anyways so once you pull the lifters you will have more answers.... This would lead me to at least want to check out the rod bearings which I would see when gapping the rings anyways so now you can gap your rings , lol
I would say one problem was lack of oil, then go after why was there a lack of oil.
Anymore I pull the engine down, bearings are cheap, and my luck at a good engine
has not been very good, lol.
i havnt done a build thread yet i will ....i was coming alone nicely but then things like yard work and fishing get in the way lol...
heads and lifter are out , ill check rod bearings tonight.....
saying i do take it apart is everyone reusing ther rod bolts? what are you guys torqueing them too?
I re-used everything. My L33 was brown inside, but in good shape.
Just google LS rod bolt torque. They are TTY bolts so there is an initial TQ spec followed by degrees of rotation. The later engines had a slightly different spec than the earlier engines. GM upgraded the bolts.
I don’t have the info at hand.
well disassembled the engine....cam bearings are shot . mains look ok , rods look ok ish.
so looks like its gonna need a new set of lifters, pushrods,oil pump, timing chain, new cam bearings ,pribally rods , regap rings and back together......uhg
thats was my feeling.... anyway i supose i ahould start a build thread on this old girl....
https://ls1tech.com/forums/forced-induction/1900228-1956-chevy-5-3-7875-turbo.html
Last edited by jasonsnova; Jun 10, 2018 at 10:32 PM.
Jason - those rod bearings look fine... I am working on an L33 with similar look, but 1 had some copper showing so I got some Clevite standard replacements on amazon for 18 bucks...
CAM bearing isn't even showing copper so send it....
new lifters/trays kit from summit is 149.00 , sloppy stage 2 cam ? use the ebay sale..... Beautiful ride man, your daddy is gonna go crazy once he takes it for a spin when done lol
the top pic is all copper....as a matter of fact all the cam bearing are showing copper.
i dropped block off today to get new cam bearings and gonna have heads surfaced.....rest is going back together
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l59 cam wiped out..... 
