LUK SMF pressure plate bolt

[laserjock]

I'm less than happy. Installed my Luk SMF. Went okay. Go to install the pressure plate. No Bueno.

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Here are the packages the bolts came in. They both clearly say torque to 45-49 ft lbs. flywheel bolts are 3/8. I could by that for them. I set torque wrench to 47. No problem. The pressure plate is 5/16" bolts. 45 is a lot on a bolt that size. Ford service manual calls for 15-20 ft lbs on those bolts. I figured, well, it's aftermarket, should go with what the package from the manufacturer says right??

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Not so much. The good news is that I got the broken bolt out of the flywheel.

So now *** do I do. I'm hosed until Monday at this point. Parts stores have nothing. Can't talk to CS anywhere till Monday. The thing is, I'm afraid to put the others back in there now because 1 broke and it seems like there were others that were stretching so I really need an entire set and I will not torque them to that spec, I don't care what the package says.

So here is my plea. Anybody have any idea where I can get such a thing? It's a 5/16-18 x0.95 as per the package. Closest thing I have found is this.

Mr. Gasket 911 Pressure Plate Bolt - Set of 6 https://www.amazon.com/dp/B000BWAOU8/ref=cm_sw_r_cp_api_QCVIxbSNWRH2X

Any other suggestions??

Thanks guys and gals.

[emoji20]

 

[riotwarrior]

That bolt looks used?

 

[F350camper]

other than spec-ing out more universal fasteners on mcmaster carr i've got nothing. But I will say you are right to want to replace them all. With all the time you have put into this build, wait it out till you get new ones. I agree that the non breakers are now suspect. I say wait till you get new ones, even if its another mislabeled bag from LUK. Just my .02

 

[laserjock]

Yeah it's used up now for sure. It was new in the bag. Bag was sealed.

Last thing I want is the damn clutch coming apart in this thing. I tried McMaster. They don't have anything that will work. I have the DMF bolts but they are a little short and the shoulder is much shorter. The bolts actually thread into the flywheel far enough that the shoulder acts like a pin. That's what makes it hard.

 

[ifrythings]

I just used grade 8 bolts with washers and loctite that were the same length and have had no problems, I wouldn't worry about getting the exact same fasteners.

 

[79jasper]

You try fastenal?

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[subway]

I have the old bolts I took out of my luk clutch but new would be best.

I would not worry to much about using a different bolt if the heads fit ok. Just don't use a regular hardware store bolt. Even the grade 8 at hardware stores can be suspect. Like mentioned I like Fastenall.

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[MTKirk]

I used the Mr. Gasket bolts you mentioned up thread, If you use regular grade 8's you'll end up with a fully threaded bolt that will allow the pressure plate to rotate a bit on the flywheel. It might be OK but then again it might not. If you want you can put it together with regular grade 8's, then change them out later through the inspection plate when the Mr. Gasket bolts arrive.

The torque setting for these bolts is 15 - 20 ft. lbs. The setting on your bag is a mis-print. There isn't a 5/16" grade 8 bolt in the world that can take that much torque.

 

[jwalterus]

Here's a link everyone should have bookmarked........

https://www.fastenal.com/en/83/torque-calculator

 

[laserjock]

Just to update. Called Tech line this morning. I told the guy what kit I had and asked what the bolt torque was supposes to be and he say "You didn't try to tighten them to 45-49 ft lbs did you?" before I even got to the what was printed on the bag. They recalled those because the bolt manufacturer screwed up the torque on the bag ( )but apparently missed a few sets. He was impressed that I got all but 1 torqued to that value though.

Waiting now on an answer as to what they recommend for the flywheel bolts and where my new bolts are coming from. I can't believe there is a question about that but apparently there is. I will update with resolution.

Some guys have all the luck. Apparently mines all bad. This is what I get for not trusting my gut. I knew better.

 

[laserjock]

Alrighty. Phone call from Luk. New flywheel and pressure plate bolts are in the mail. They put a torque spec of 47 ft-lbs on the flywheel to crank which is what I used so I think we are probably okay there. Torque spec for the pressure plate bolts is 20 ft-lbs. So it cost me time, but I was having a hard time finding bolts so I guess it all works out. For the record, the Mr. Gasket bolts referenced above were about to be ordered. Closest thing I could find. I had not worked my way all the way through the ARP catalog but they probably had something close enough somewhere.

Update to close this when material received.

 

[icanfixall]

Alrighty. Phone call from Luk. New flywheel and pressure plate bolts are in the mail. They put a torque spec of 47 ft-lbs on the flywheel to crank which is what I used so I think we are probably okay there. Torque spec for the pressure plate bolts is 20 ft-lbs. So it cost me time, but I was having a hard time finding bolts so I guess it all works out. For the record, the Mr. Gasket bolts referenced above were about to be ordered. Closest thing I could find. I had not worked my way all the way through the ARP catalog but they probably had something close enough somewhere.

Update to close this when material received.

Finally got to your last post and was going to tell you the bag torque was WRONG.. It was for the crank to flywheel bolt but you already now know this. sorry for the problems but.. they walk amongst us all the time. Please do not use the stretched bolts that took this high torque. they are probably well past the fail point of stretch. If you can please mic how much strtetch they took and compare to the new bolts. you might be surprised how much they took.

 

[laserjock]

Finally got to your last post and was going to tell you the bag torque was WRONG.. It was for the crank to flywheel bolt but you already now know this. sorry for the problems but.. they walk amongst us all the time. Please do not use the stretched bolts that took this high torque. they are probably well past the fail point of stretch. If you can please mic how much strtetch they took and compare to the new bolts. you might be surprised how much they took.

Yep Gary, those are going in the trash as soon as the new ones get here. I am sure some of them stretched quite a bit. If I think of it, I'll mic a few.

 

[MTKirk]

If your flywheel bolts are indeed grade 8 I would NOT tighten them to 47 ft lbs. That is the spec. for the Ford factory bolts which are a special grade 9 bolt. I and many others are using grade 8's with no problems. I torqued mine to 38 ft lbs. and used plenty of thread locker.

 

[laserjock]

I can tell you they are not just standard grade 8 bolts. The heads are oversize. 47 ft lbs is what LUK said to go to.