spun bearing

tarmon8r · 04-06-2005, 01:52 PM

I just pulled the motor out and found the problem. Spun the rod bearing to piston #1. I will attach a pic shortly. It was bad. There was discoloration (black) on the #2 rod bearing. All of the other rod bearings color was fine except for a little wear, however it wasnt smooth wear. Motor has about 5000 miles. Havent pulled the crank bearings yet. Plan on pulling the crank out and checked. Having the rods rebuilt. Question, I already have ARP rod bolts, with only 5000 miles, can I reuse them? Im going to pull the motor completely down and clean everything. The block was O-ringed. I have never done those. How do you go about re-installing? Need a special/particular headgasket? BTW, the motor was built by my machinest. The cam was degree'd in. Can i just mark the timing chain, cam and crank and re-install or do i need to re-degree?

~The Jester~ · 04-06-2005, 03:54 PM

Absolutely no ******* way I would use the old rod bolts on #1, and I'd pitch #2 also just to be safe. Should be Okey Dokey on the rest of them though. Tighten them with a stretch gauge if you can, get a more accurate reading that way, and you'll see how much they're already stretched, outta spec, pitch 'em!

Capri306 · 04-07-2005, 02:38 AM

Better off safe than sorry, in my experience. I'd go with all new fasteners, and call it a cheap insurance plan. Also, was the rod itself the cause of the failure? Is the crank going to be reground and checked (I think it's going to be necessary after wiping damage like that)? Just questions on my mind. That REALLY sucks that it only lasted 5000 miles, dude. Hopefully it'll go right this time. Good luck.

04-07-2005, 02:38 AM	#3
Capri306 Moderator Join Date: Sep 1998 Location: Grand Rapids, Michigan, USA Posts: 1,001	Re: spun bearing Better off safe than sorry, in my experience. I'd go with all new fasteners, and call it a cheap insurance plan. Also, was the rod itself the cause of the failure? Is the crank going to be reground and checked (I think it's going to be necessary after wiping damage like that)? Just questions on my mind. That REALLY sucks that it only lasted 5000 miles, dude. Hopefully it'll go right this time. Good luck. __________________ Capri306, Moderator The Mustang Works Online 1979 Mercury Capri 1987 5.0L Mustang LX Notchback 1993 5.8L Eddie Bauer Bronco

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04-06-2005, 03:54 PM	#2
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	Re: spun bearing Absolutely no ******* way I would use the old rod bolts on #1, and I'd pitch #2 also just to be safe. Should be Okey Dokey on the rest of them though. Tighten them with a stretch gauge if you can, get a more accurate reading that way, and you'll see how much they're already stretched, outta spec, pitch 'em! __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....