Pressure plate install question
Thread Starter
Instructor
Joined: Apr 2004
Posts: 196
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From: St Paul MN
Thanks, also one of the bolts that tighten the pressure plate broke off in the flywheel, had it extracted with an EZ out tool, but where can I purchase these bolts? Can I just bring the bolts to Home Depot and buy the same size, or do they sell at an auto parts store?
Tech Contributor
Joined: Aug 1999
Posts: 14,375
Likes: 6,374
From: At my Bar drinking and wrenching in Lafayette Colorado
crazy -
The bolts are grade 8 bolts, but more importantly they have a short shank (non-threaded area) under the head that acts as a bearing surface against the pressure plate bolt holes. Bolts you buy at Home Depot in this grip length will be fully threaded, and are not suitable for use as pressure plate bolts. Either get the right "shanked" bolts from an auto supply store or order grade 8 bolts with a shank from a good source such as McMaster-Carr.
BTW, I've never used LocTite on PP bolts, and I've never seen one come loose as long as the correct lockwashers and the correct torque is used.
Lars
The bolts are grade 8 bolts, but more importantly they have a short shank (non-threaded area) under the head that acts as a bearing surface against the pressure plate bolt holes. Bolts you buy at Home Depot in this grip length will be fully threaded, and are not suitable for use as pressure plate bolts. Either get the right "shanked" bolts from an auto supply store or order grade 8 bolts with a shank from a good source such as McMaster-Carr.
BTW, I've never used LocTite on PP bolts, and I've never seen one come loose as long as the correct lockwashers and the correct torque is used.
Lars
Melting Slicks
Joined: Dec 2000
Posts: 3,407
Likes: 2
From: Carmichael CA
I never have used anything on my threads except Part B for anything entering the water jacket or oil passages. I was a fleet mechanic for a dozen high use vehicles for 3 years and during that time replaced just about everything...if a bolt, nut, or anything would have fallen off then I would have known about it.
In fact I found that bolts which had lock-tite on them would break or break my sockets trying to get them off...sometimes breaking more than just the parts or tools (rubs knuckles with scars). The same problem occurs if you use oil...the oil will burn and form a really brittle substance that acts like glue.
Also, anything you put on the threads will interfere with the torque settings...usually making it easier for them to tighten, thus resulting in over torqued bolts. Just clean the bolts real good...and like Lars said...make sure the bolts don't have threads all the way to the head...there needs to be a solid ring where the pressure plate will hit...otherwise...in time...the bolts may snap due to the impact.
