Crank oil clearance ?

[Jonny H]

I bought a rebuilt short block and was told the crank was .020 over and the rods were resized to .020 over. I do have the paperwork from the machine shop so I know it was done. I plan on checking the rod and main cap bolts torque just to double check them. Should I use some plasti gage and check the oil clearance also ? just to make sure and what should the clearance be?

Thanks

(72 stock 318 for street use)

 

[Coyote Jack]

The terms are actually .020 under. But to answer your question, you would want about .0025 clearance on the installed bearings if I remember correctly. This would be different in a boosted or nitrous engine.

Jack

 

[stroker_valiant]

I would most definatly check clearances. What does a strip of Plastiguage cost, 2 bucks? Well worth the effort to check! I would never assume anything on an engine that I did not assemble.

 

[Jonny H]

yeah your right on the over/under. .0025" sounds right

The pan was already installed but the gasket was pushed out on the end so I pulled the pan to redo it. figured I would check things out while I was in there. Glad I did the oil pickup was loose and after I checked the crank numbers I found out it was not a steel crank like the guy said.
Like you said for the little amount of time and money it would be better to be safe than sorry.
Thanks

Jon

 

[1wild&crazyguy]

on average street build...look for around .0015 -.0021....when higher rpms are planned, look for around .002 -.0025

check one at each end, like no.one & 8 rod/main journals.

jmo

 

[MRL Performance]

Dont forget, whatever the plasti gauge says you have to double it because your only checking 1 side of the journal.