Author Topic: crank bolt, substitutes for flywheel lock tool (Read 4135 times)

nomad · « **on:** March 06, 2008, 11:49:05 AM »

I feel the best option for me is to lock the flywheel and pop the front crank bolt that way. The head is off the engine and nearly everything is disassembled. I'm going to start reassembly soon and need to get this off.

I don't want to shear a bolt in half by getting the wrong type. Any suggestions?
I've seen suggestions to use large screwdrivers, bolts, steel rod etc.

I have some small rebar but I'd have to cut it off first.

should i just get a small prybar and stick it in there?

kowalski · « **Reply #1 on:** March 06, 2008, 01:30:15 PM »

http://m42club.com/forums/showthread.php?t=4961&highlight=loosening+crank+bolt

yes you can put a metal rod of some sort in there to hold it as long as its the same size.

crookc · « **Reply #2 on:** March 10, 2008, 09:57:18 AM »

So from what I have read on this site, you should lock the flywheel and then remove the 22mm bolt on the front of the crank.

Is this true for an engine still in the car?

Is it a left hand or right hand thread?

Thanks for the help

nomad · « **Reply #3 on:** March 10, 2008, 10:06:26 AM »

yes. i'll be doing this soon, when i get a chance, and the engine is in the car. thread is regular thread.

crookc · « **Reply #4 on:** March 10, 2008, 10:40:49 AM »

Thanks for the info

D. Clay · « **Reply #5 on:** March 13, 2008, 10:52:31 AM »

Make sure the cams are positioned as in this picture. TDC happens twice in a four stroke and it's best to have the cam gears as shown.

318is93 · « **Reply #6 on:** March 13, 2008, 02:51:10 PM »

Hey. If you get a bolt M8x50 it'll work. I just used a 24" breaker and got my bolt off yesterday. It actually wasnt that hard.

nomad · « **Reply #7 on:** March 13, 2008, 03:25:15 PM »

I'll probably get to it this weekend.
I think I'll try a headbolt first.

Paul Strefling · « **Reply #8 on:** March 14, 2008, 04:48:52 AM »

Is the hole 8mm?

318is93 · « **Reply #9 on:** March 14, 2008, 02:13:17 PM »

According to the templates I have it's 7.8? I just bought a good M8 bolt atleast 50mm long, filed down the threads a bit and it worked perfectly for the flywheel lock tool.

nomad · « **Reply #10 on:** March 15, 2008, 07:39:33 PM »

I tried a headbolt first but the threads juuuust kept it from fitting.
i have a punch set and used a straight punch slid in there. Worked fine.

blalor · « **Reply #11 on:** March 24, 2010, 07:56:19 PM »

Old thread, I know, but how far does the flywheel lock tool/bolt/shaft intrude into the flywheel? I tried using 6mm and 7mm allen wrenches, but it doesn't feel like it's going in very far. I see a mark on the wrench about 5mm in from the end, which doesn't seem like a lot. And when I turn the crank the end of the wrench not in the hole gets levered up. Doesn't feel like it's going in far enough.

dinu.negrean · « **Reply #12 on:** March 25, 2010, 03:51:09 PM »

I had it done by a shop and it work perfectly. Could loose the bolt with no problem using it.

http://www.flickr.com/photos/47779682@N05/4463470070/sizes/o/