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keeping flywheel bolts tight

Hi. Forgot password but does anyone know how to keep them tight? Its a lightened flywheel on a knife edge crank, big rev motor. 202 red.

Not sure if the bolts have been enlarged or any other crank/fwheel mods performed. I think i put threadlock on when i assembled.

I also remember the heads of the bolts were not very tall and it was hard to get a grip on with the socket.

What torque setting do i use?

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Loctite Red thread sealant on the threads and a dab of oil under the bolt head then torque up as per factory specs. Make sure you get the torque right so it doesn't rattle loose which the lightened flywheels can do.

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Cheers,

Emu

O.H.T.C. original member

use arp bolts 206-2802 with their lube on threads and under head. these take a double hex socket. they tell you the torque, IIRC its 55lb/ft when using them.

if the bolts have been enlarged to v8 spec they will be 7/16unf not 3/8unf.

if you have had one come loose check very carefully the flange and hub faces because it is actually the friction between these 2 faces when torqued up that is supposed to transfer the torque of the engine, not the bolts.

with flywheels, some people dowel them on, some use loctite, i have never felt the need to do either even with the stock bolts because i have NEVER ever had one come loose. simply clean, dry, rust-free flange and hub, bit of lubes on threads and under heads and properly torqued.

i believe if you are having constant problems you are probably in a bad harmonics range of the engine, for most inline 6 cylinders this is around the 6200rpm. change driving style or gearing as required to go quickly above or stay below this range.

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Thanks so much guys. Taking a lunch break from gearbox removal. Will keep you posted!

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Ok so the bolts are enlarged double socket ones. Assuming they are arp.

They were loose and im wondering if theyre ok to use again?

There is some chatter style marks on the flange face of flywheel that match with filled in crank flange holes. Ill clean these up.

i remember now the flywheel was on the motor when i got it and not having a fitting socket i assumed the bolts were torqued up. whoops, not a good way to run an engine in..

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arp will be marked arp.

quality brands are not afraid to display their names. that goes for almost any aftermarket engine component.

anyway if they are 3/8unf the arp's will have a 9/16 head. if yours are bigger they are something else. doesn't matter, just make sure you know the size so you can torque accordingly - if its got v8 size bolts for example they must be tensioned tighter than 6 cyl bolts.

be careful with any fret marks. it can be a loss of friction between the crank and flywheel and that can cause problems as i explained why in my post above.

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Ill clean it up really well, its only a few spots on the flange faces. Thanks heaps

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Hi all I've had this problem with my torana a few times I always make sure it's spotless I actually do the bolts up not to the tension but tight then remove each one individually use the loctite primer add the loctite and tension it up, it's dowled also, just about had it ... The repairs about to happen for the 3rd time, this time sonic injection locking tab is to be fitted ... Oh yes and every time new bolts 😠😠😠

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