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Old 13-08-2016, 09:10   #16
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Join Date: May 2011
Location: San Francisco and Australia
Boat: Liberty 458
Posts: 1,597
Re: engine mount trouble

Originally Posted by a64pilot View Post
When you go to replace the bolts, I'd make sure I had at least grade 5 bolts, do NOT use hardware store crap bolts, go to a fastener store and get real grade 5 or maybe grade 8 bolts.
On second thought I'd consider studs as it seems you can always get a nut off, but sometimes not bolts.
I'd also use plenty of anti-seize on the bolts as one day you may want to remove them.
Be real careful with easy outs, I've busted them off before, and your sort of screwed then, cause nothing I have found will drill out an easy out.
Using a pilot to keep the bit centered and drilling all the way through a bolt will sometimes make it easier to get out. get a few new good drill bits and replace when one gets dull, oil the hole being drilled of course with cutting oil
Grade 8 for sure. Grade 5 are a cheaper construction spec where there is always plenty of redundancy which is not the case for engine mounts. You'll see the multiple dash markings on the head. 3 for grade 5 and 6 for grade 8.

If access is an issue you might like to replace with socket head cap screw or mushroom head internal wrenching set screws.

No hardware store unmarked crap.

Access can be tricky so the quote of 8 hrs is probably not unreasonable especially since it includes alignment.

Ensure plenty of never seez or loctite on the threads. I prefer to lock wire torqued bolts. You will need to check they havent backed off regularly.

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