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Ferked "Flywheel Puller Hole Thready Things"
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Author:  kazjim [ Wed Jan 04, 2006 8:36 pm ]
Post subject:  Ferked "Flywheel Puller Hole Thready Things"
Hey all, I've officially started on "BIG HP 998" tonight.... started pulling down a spare motor i had lying around (9Y/Ta/........)
Turns out to be 0.060" over ..... sweet, if it cleans up with a quick hone, then all is well, otherwise its an anchor....

But anyway, the point is... trying to take off the flywheel ... I pulled out my trusty BMC Flywheel puller, threaded the 3 bolts into the flywheel about 2" and then proceeded to tighten the centre bolt , all ready to release the flywheel with a satisfying little pop....

this did not happen... one of the "Leg" bolts, pulled out of the flywheel !!!

the thread was already stuffed by the previous builder !!! :x :x :x :x :x :x :x

So, anyone have any ideas on how to get the FLywheel off ? - I'm happy to sacrifice the flywheel, i have a "DRMINI ST" flywheel here so the single-piece one is going to get turfed anyway.... but i'd like to save the crank and the housing . . . .

Little help ?
J
Author:  drmini in aust [ Wed Jan 04, 2006 8:39 pm ]
Post subject: 
Tap the flywheel holes out to 7/16" and buy 3 new bolts..
They are 3/8" UNF now.

Get grade 5 or 8, not Chinese cheese ones...
Author:  kazjim [ Wed Jan 04, 2006 8:44 pm ]
Post subject: 
Yea, thats what i was thinking.....

I'm thinking that the PO didnt have the flywheel bolt tight enough (i undid it without even a little sweat) and the taper has micro-welded...... :?

thanks Kev....
J
Author:  drmini in aust [ Wed Jan 04, 2006 8:48 pm ]
Post subject: 
People use bolts with worn threads, eventually these pull the threads out of the flywheel. And the 1 piece one is `Detroit Wonder Metal', not steel. Easier to strip.

Tip- keep an eye on all the threads (including centre bolt), and oil them well.
Author:  9YaTaH [ Wed Jan 04, 2006 8:56 pm ]
Post subject:  Tap
If you can get any sort of purchase on the flywheel with the existing bolts, another puller or Kevs bigger bolts....try carfully whacking the back of the flywheel with a short piece of hardwood and a BFH...use the biggest lump of wood that will fit through the starter motor hole.

dont keep hammering in one place....one or two descent hits should be enough....the second you should rotate the flywheel 180 (yep loosen off, turn the engine then apply tension again.

be careful because they can let go with a bang....some fall off easy, others... well....
Author:  mooman10_0 [ Wed Jan 04, 2006 9:00 pm ]
Post subject: 
it is possible to drive it out from the starter motor hole. Takes time and patience though. Thats how i did it when one of my bolts snapped with the thread still stuck in the flywheel :? Long metal pole and a big ass mallet!!!
Author:  drmini in aust [ Wed Jan 04, 2006 9:27 pm ]
Post subject: 
Very best place to hit them (ONLY if you must!!) is on the side of the taper, with puller tightened up. Use a big copper drift and a VBFH...

Careful, hitting them thru the starter hole. I've scrapped flywheels due to bad bruising on the back, they are only cast iron and crack easy.
And in a RHD car, we all KNOW where they go when they shatter....
:shock:
Author:  TheMiniMan [ Wed Jan 04, 2006 10:13 pm ]
Post subject: 
B F H through the starter hole

easy-peasy

spin 1/3 of a turn every hit & hit the ring gear

easy-peasy
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