Long story short, I couldn't find the correct bolts to hold the pressure plate onto my Trooper's flywheel. I did, however, find some without any shank that are correct in every other way. Will these be alright?
It's a Chevy 60 degree V6.
Long story short, I couldn't find the correct bolts to hold the pressure plate onto my Trooper's flywheel. I did, however, find some without any shank that are correct in every other way. Will these be alright?
It's a Chevy 60 degree V6.
Guess you'll find out sooner or later. 
Does it have dowel pins to locate the pressure plate?
might try ARP
After looking around, I'd play it safe. Get the correct bolts.
It's just easier to go for new bolts.
Want to tear that all apart again?
The manufacturer put those bolts on there for a reason. Get the right ones and don't find out what it's like to have your clutch come through the floor.
Tom Suddard wrote: I did, however, find some without any shank that are correct in every other way.
Are you sure? Most bolts that are threaded all the way are Grade 2, whereas most automotive bolts are either Grade 5 or Grade 8.
Answer: Depends on how much you value your feet and/or time. 
Get the correct bolts, shank, grade, and all.
+1 on the ARP. I've seen clutch/PP explosions at the track, it ain't pretty. I like my feet. Even if nobody gets hurt it causes massive amounts of damage. I've yet to see a failure that didn't total the car (destroyed floors, destroyed trans, destroyed engine).
Trooper means metric = Grade 12.9 (8.8 is lower grade stuff)
They are grade 8, I made sure.
The only reason I have them is that I've looked literally everywhere and can not find pressure plate bolts. I'm trying so hard to do this right that I've been through two sets of wrong bolts already.
I finally ordered bolts that I'd heard might work from Advance Auto Parts, but the threads were wrong. I've been trying to track down pressure plate and flywheel bolts for a month. I've even been emailing ex-Isuzu dealers trying to find someone. At this point, I would seriously pay $100 for six bolts if I knew they were correct.
Does anybody have a clue where where I can buy the right ones?
914Driver wrote: Trooper means metric = Grade 12.9 (8.8 is lower grade stuff)
They say 12.9 on the head.
I'll paypal $5 to anyone who sends me a link to the correct pressure plate and/or flywheel bolts for my 1991 Isuzu Trooper with a 2.8. I know this forum can do it!
So...
Possibly. I'll have to check those dimensions when I get home. Still looking for pressure plate bolts.
hrdlydangerous wrote: So... Did I win?
Are those clutch cover to flywheel? I think not.
This may sound silly but...Have you tried contacting a GM dealer for the parts?
I don't think there are any Isuzu dealers left but Maybe these guys can help?
In reply to spitfirebill:
He said "and/or flywheel bolts". 
hrdlydangerous has a point. IIRC on Isuzu/GM shared parts if you drop the first and last digits of the Isuzu part number what's left is the GM part number.
For some nutty reason, myisuzuparts.com is a 404 now? That suxxors. 
Yeah, tell me about it. I loved that site!
And my offer was for new bolts, but I think I'll send hrdlydangerous something.
In reply to Tom Suddard:
Can you send me the keys to Dad's Shelby? seriously though, don't worry about it. Glad to help.
I too had a hard time4 finding pressure plate bolts for a GM 3.4 V-6 which is the same as the 2.8 V-6. Even the dealership couldn't give me a straight answer. I finally used ARP Part Number 150-2202 which are pressure plate bolts for a Ford Mustang 302/351 Windsor V-8. The bolts are M8-1.25 pitch. They can be found on page 65 of the ARP onling catalog.
I figured if they were strong enough for the V-8's they would be good for the modest horsepower of the GM V-6. The 2.8 & 3.4 I believe were GM's first all metric fastener engines and even the dealerships have a difficult time. I have had them tell me "bring one in and we will match it up". Of course if I had one I wouln't have been asking them!
Tom,
The best bet in this kind of case is to stop trying to find a model specific bolt and source the hardware by spec. You know that the bolt is M8*1.25. That and the fact that it is a 12.9 grade bolt gets you everything except the unthreaded length and the threaded length. PLaces like McMaster-Carr (mcmaster.com) carry just about every bolt you can think of and then a few extras. If you can work out the threaded length and the unthreaded (shank) length you can order what you need for significantly less than dealer specific parts. If the threaded lengths are too long, that can be fixed with any number of destructive tools (lathe, hacksaw, grinder, teeth... maybe not a hammer).
This approach requires that you figure out how much load you are working with and how it is being resisted.
Oh yeah, refering to the title of the post, the shank on the bolt is only impontant if there are no dowel pins to locate the clutch cover (pressure plate). Once the cover is located, the bolts are only there to hold the cover to the flywheel and resist the force from the clutch spring.
I sorta like the idea of an unthreaded shank on a bolt like that. Under enough of a twist load the pressure plate could contact the bolt and if it's threaded there yeah it could start doing strange stuff like loosening the bolt, perhaps. Think of it this way: they spec'd that type bolt for a reason and had to convince the bean counters it was necessary.
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