Jclgodale3

Can someone tell me the difference in automatic transmission (flexplate) bolts and manual transmission (flywheel) bolts? I seem to have some interference on my clutch plate springs with the bolt heads on the flywheel...

Jclgodale3

anyone? Are the automatic flexplate bolts taller in the head of the bolt than Manual flywheel bolts? Seems to be the only possability of the springs on the new clutch disc touching them...

joe73vette

Flywheel bolts and flexplate bolts both have thin heads. The difference is only the length. You shouldn't use the wrong ones - too long and they hit the back of the block, too short and they won't hold the flywheel. They should protrude just a tiny amount through the crankshaft flange.

If you are using the correct thin head bolts, the reason your clutch disk is hitting the bolts is it's on backwards. The springs go out towards the cover.

Hope this helps.
Joe

Jclgodale3

Joe...I have the thin head bolts on it...the clutch disc is marked and says "this side towards flywheel". The springs proturde out from the disc much lees on the flywheel side than on the pressure plate side but that small protrusion in the front seems to be just catching the heads of the bolts. The disc is on correctly and the flywheel is a brand new aluminum flywheel. Any other ideas? Thanks

joe73vette

Hmm, you ruled out my other idea, the flywheel has been surfaced too many times. If nobody else has any ideas you might have to go to the manufacturers for advice. Perhaps you should list the names here in case someone else has the same stuff. Sorry I can;t help. Joe

Jclgodale3

the clutch is a 10.5" Zoom and this is the flywheel
http://cgi.ebay.com/ebaymotors/ws/eB...964741965&rd=1

WESCH

HI

When I changed the clutch and resurfaced the flywheel, I used new bolts ( ARP ). Those are different from the ones that where installed.
The old once where 6 point heads, the ARP are 12 point bigger diameter heads. The old bolts used washers, the ARP bolts had a danger note with them to not use any washers with them ?
This of course brings them further away from the clutch ( springs ).
Would that help ? I think I ordered from SUMMIT.

Günther

Engraver

I bought some arp bolts for a new flywheel a couple weeks ago. The ones I bought were part number ARP-200-2802

There is something about two different head sizes that summit mentioned to me when I ordered these and that the larger ones could be too large in some applications. The ones I ordered are the larger head size (they take a larger socket). I didn't quite understand what these larger ones would interfere with since they go into a recessed area on the flywheel.

I'm not sure if this info is any help to the problem you are having.

WESCH

Hi

Did you install washers with the ARP bolts ?
Without washers , as they mention to do , this bolts are very long and nearly touching the block casting.
I actually ground about 2 threads away of each bolt to assure clearance.
The ARP bolts have the exact same lenght as the old 6 point bolts had , but the old bolts had locking washers installed, so rather thick washers.

Günther

Engraver

I didn't use washers... a small sheet that came with the arp bolts said not to. I did take a look at how far they were coming through. They were sticking out a little, but it appeared like a safe distance from the block.

Jclgodale3

could I have a machine shop machine just the bolt suface down about 3/16" for the clearance I need? Would this compromise the flywheel strength?

Rockn-Roll

That sounds extreme to me. Yes it would reduce the strength, and since it's aluminum and not steel then 3/16" could weaken it too much. If the clutch disk springs touch the flywheel then it's the wrong flywheel or the wrong disk. There should be a significant indent in the flywheel where the springs will sit. I believe the flywheel for the automatic tranny and the flywheel for the manual clutch are different...they could have shipped you the flywheel for an automatic by mistake.

You may want to contact Zoom and order a flywheel from them (if they sell them), or ask for some options that will work with their disk.

Jclgodale3

but the springs aren't touching the flywheel...only catching the heads of the bolts. Thats why I thought a small machining then going without the washers on the bolts would create the clearance I need. Bad idea?

dmacp

ARP 200-2807 is made for a 1 piece rear main and is 1.0" long. ARP 330-2801 is standard SBC and is .875 long. the 1 inch long bolt will just contact my '70 350 block using a Speedmaster flywheel.
They are not real clear about this on Summit. Please beware!

derekderek

haven't heard anybody else mention this issue in the last 18 years...

dmacp

well, it just happened to me, it was a near painful experience, so I thought I might try and save someone else the trouble. If you know better, then please disregard

Rescue Rogers

what is the clutch disc part number. They offer them with reversed springs so they would be on the wrong side in your application...its the only thing I can see causing your issues.Or you have a the wrong disc for your flywheel.

vettebuyer6369

Unfortunately, adding a post to a thread thats been dead for 18 years might not get read. Its better if you start a new thread describing your experience, and you can link this thread from 2005 if you like.