[Awesome 72]

Just put in the new crank, but it seems there's a clearance problem with the bearings. Can someone who is familiar with this please get back to me so I can explain.

 

[big2bird]

Did you use a plastigauge? Too tight/loose?

 

[matchframe]

Could it be possible that you may have the wrong bearings? You may have bearings that are for a crank that has been machine turned which needs a thicker bearing. If your crank has not been turned and you have the thicker bearing, it would bind up.

 

[Awesome 72]

too mutch bearing clearance o crank?

1-4 bearings are .004
# 5 is .006
thats seems too loose to me ,its a new eagle crank,standard size cleavite 77 bearings..plastigaged all the bearings...

 

[TwinTurbo]

......

EDIT I should read better, it's too loose WOOPS Did you mic the main bores and the crank mains?

 

[TimAT]

Too much clearance!! The rear should be .002 to .003 at the most. Looking for an oil leak otherwise, not to mention oil pressure problems.

Factory specs-

Mains .002 to .003 Minimum Preferred .005 to .007 end play
Rods .002 to .0025 Side clearance .010 to .020


You guys just can't catch a break..

I'll tighten up the rear main a bit to improve oil control at the rear main seal, IF I'm looking at a really long term engine. If it's one that's going to be run hard and rebuilt then .002 is best. But that's just me. I've seen lots of factory built engines with .0015 rear bearings.

Tim

 

[Awesome 72]

Well I Tried

Tim...followed advice and torqued main down to 70 instead of 65 and now
most are in the 3th range with front and rear ones at 4th.