Thread: F100 - power unit is off the mid section

I'm assuming you hit the puller bolt square with a hammer while under tension. Not so hard it will dislodge the magnets but all of us has to do that. I will startle you when it pops free.

Yes I did hit it, then this happened!

I got a heavy duty puller coming via the jungle company. Hopefully better bolts.


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I only use Grade 8 bolts, I have never had that happen. Sorry for your difficulties, the broken bolt should be easy to back out with a left handed drill bit. The Flywheels are very hard to get off, I use lots of HP grease on the puller threads and ring the puller bolt with a hammer several times before a Flywheel I just installed will come back off. When they pop sometimes they will clear the block, I put bungees over the top now.

Originally Posted by Rojo

I only use Grade 8 bolts, I have never had that happen. Sorry for your difficulties, the broken bolt should be easy to back out with a left handed drill bit. The Flywheels are very hard to get off, I use lots of HP grease on the puller threads and ring the puller bolt with a hammer several times before a Flywheel I just installed will come back off. When they pop sometimes they will clear the block, I put bungees over the top now.

Yep, the broken bolt came out real easy. I wanted to get this done so I went to the local auto store and bought the only one they had. When I went back, I asked for grade 8 bolts and they said the "no gots"! I got my money back on the one I broke and say "see ya". Ordered another one online. Now I gots to wait!

Cool stuff though. I love taking this apart. See the engineering and all. The intake side all came off as one unit with the carbs and all. Easy peasy. Removing the crank cover will be fun. See what's inside, yay, just like Christmas.

I too learned the hard way on a GEO flywheel with grade 5s swapping. Drilled em out.

A little heat and then some kroil will break a lot of stuff loose

Originally Posted by DockShootinJack

A little heat and then some kroil will break a lot of stuff loose

Can't heat the Flywheel, the magnets are epoxy glued only on the inside. Sling a magnet - buy a new flywheel. The old Looper OMC Engines, especially the V-6 engines were notorious for slinging magnets. How I have the Snap-on Puller I have today and a massive Strap Wrench just for those old flywheels.

I should have said warmed instead of heat.

Slab, on the grade 8 bolts you might try Lowes, Home Depot, etc. In the slide drawer cabnet they have a wide array of grade 8 bolts, Washers, etc.