390 crank woes

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Sep 22, 1999 | 06:02 PM

msmyth

Thread Starter

New User

Joined: Jul 1999

Posts: 13

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390 crank woes

My 76 F250 4x4's 390 has spun a bearing. Should I pull the heads and pull the piston's to see if the rod (bearing end) is out-of-round, or is it safe to just replace the crank and bearings? I'm looking at $65.00 for a complete gasket set versus $20.00 for the pan & timing set gaskets.
The heads were reworked about 25,000 miles ago (previous owner).

Sep 22, 1999 | 09:45 PM

390fe

Fleet Mechanic

Joined: Jul 1999

Posts: 1,360

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From: Iowa

390 crank woes

Along with rcank and bearing replecement, I'd go ahead and have the rod checked, just to be sure.

Sep 24, 1999 | 09:23 AM

deleontow

Laughing Gas

Joined: Jun 1999

Posts: 903

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From: Banning CA

390 crank woes

If your bearing spun, rod or main? Your rod will be bad, replace the rod, recondition rods are not very expensive.If your main spun, Major problems, normally cheaper to replace the block.

Are you having the crank cut?

Advise

Dave

Sep 24, 1999 | 06:55 PM

Mulletwagon

Senior User

Joined: Jun 1999

Posts: 349

Likes: 1

390 crank woes

Usually a spun rod bearing wipes out the crank and rod. Final branch on your decision tree may say "short block rebuild". If you are already going to pull the crank and heads we're only talking about a new set of rings (assuming bore is in spec). HTH
FL Panhandle