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Need help/info/advice 53 8N

F

Farmer(Ga)

Member
a friend helped me today to installed the sleeves and pistons, got the sleeves out and in ok,started with number 4, after torking dowm to 40 we could not rotate the shaft to install number 3, what could be wronge here, we had to give up fore today and will try again tomorrow. Thanks for any advice or help, will report back late tomorrow. James
 
Tell us a little more.
Did you have the crank ground? Buy new main or rod bearings? If so how did you determine what size bearings you need?
At this point I would plastigauge your bearings.
That's usually the cause of one not turning over.
 
Oil seal?

Years ago, I made plans to help an inexperienced friend rebuild a SD 421 Pontiac engine out of a 65 Royal Bobcat GTO.

We had everything ready to start assembly, and I told my friend to wait until I arrived after work before starting assembly but he did not.

He installed the main bearings and crank before I arrived. There were 2 rope seals in the gasket set so he installed one in the correct channel and the other in the adjacent channel that provides clearance for the crankshaf oil slinger. He then torqued down the main bearing bolts.

When I arrived the crank was completely seized and the block was cracked at the rear from the force applied to the cantilevered oil seal flange.

Expensive mistake.

Dean
 
I'm guessing that you rotated the crank to install #4 so maybe your main bearings are OK.

But if after torquing rod cap #4 you couldn't rotate the crank to install #3, then I'd say something is amiss with your rod bearings and #4 has no bearing clearance at all.

How easy was it to push #4 piston into its bore?

mhb has probably solved the problem. :)

T
 
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