Quarter Master Pressure Plate bolts

[BrokenTsi]

For those who have a QM clutch for a 6 bolt laying around, what is the part number of the pressure plate bolt kit? The one I was given from SBR, is QTR309507. These bolts will not thread into my flywheel. They are definitely not 8x1.25 like the stock bolts.

Can someone please give me the thread size/pitch of your bolts that actually work in your flywheel?

These bolts started to thread about 1/2 a turn, and I didn't push it any further.

 

[twicks69]

They are SAE Grade 8 bolts -- they use a 1/2" socket, so I am assuming that they are a 5/16"-24 bolt.

The part number from Quarter Master is: 309507
I also have them on my website under QM Replacement parts on the Mitsubishi Parts page.

Also, are you using a Quarter Master flywheel?

Please take a picture of what you are using -- clutch, flywheel, bolts, etc. It will make life easier in getting the parts that you need.

 

[BrokenTsi]

I'm pretty sure its a QM flywheel. I had to swap over a ring gear onto it. I already installed the flywheel, is that ok? Yes, its a 1/2" socjet grade 8 bolt. it doesn't thread in easy at all and I didn't want to force it. Ill take pics tonite.

 

[twicks69]

That is odd....Do you have metric and SAE thread chasers to check the thread pitch? There is only one bolt kit for these clutches for the 7.25" V-Drive twin-disk.

As well, it likely is a QM flywheel, as they are the only ones that require you to get a ring gear, then install it.

 

[BrokenTsi]

How about I order a kit from you and ill send you these bolts to have a look....

What is the actual thread size/pitch of the flywheel? Ill go buy a chase or even just a bolt to check it.

Can I use studs instead of bolts anyways? I noticed the bolt kit also came with 6 nuts.

 

[twicks69]

Hmmm....that's odd. It should be 6 bolts, and 6 washers. That's it.

I didn't even look at the last one I sold; I just threw it in a box, and shipped it to Canada for a DSMTuner member.

I can have Geoff ship me a hardware kit, or give me the bolt size/pitch information tomorrow.

 

[BrokenTsi]

I decided to take a look at the flywheel and have a better look. There is nothing wrong with the threads on the flywheel, nor the bolt. Let me try to explain this the best way I can.

The thread inserts on the QM flywheel appear to be spot welded on from the back of the flywheel. 3 of 6 inserts will not accept a pressure plate bolt (5/16-24). I can get all 6 bolts to thread into 3 successfully, and those SAME pressure plate bolts will NOT thread into the other 3.

I believe the problem is, when the inserts were installed, the heat caused the insert to contract thus making it smaller than it should be.

I COULD chase it with a tap and call it a day, however, I feel that I shouldn't have to. I think someone forgot to chase and/or at least check these inserts to make sure they can accept the supplied hardware. I am pretty disappointed about this. I don't want to chase these threads. I don't want to risk having a pressure plate bolt fly out that's only torqued 18ft/lbs or so because the threads have been compromised. It really makes me feel skeptical.

I still want a QM clutch regardless, but I think someone owes me a new flywheel.

Also, while I'm thinking about it.....I'm using flywheel bolts that Shep gave me. I don't know the part number, but he has a QM install kit that I bought, which included TOB, modified clutchfork, spacer, and flywheel bolts. What's the proper way to check that these flywheel bolts are the correct length and they won't bottom out before final torque value?

 

[twicks69]

Well, measure the depth of the crank bolt holes from the flange to the total thread depth, then measure the thickness of the flywheel flange and the spacer flange to get the total value.

Just chase the bolt hole threads on the flywheel. If you are complaining that they don't fit, send it back to Quarter Master, and they will likely just chase the threads and ship it back to you. It is not rocket science, you just have to fix it.

As easy as that.

 

[BrokenTsi]

I talked to quartermaster, they are going to press in new inserts for me when I send the flywheel back.

I ran a chase thru it, and it didn't go in easy. It broke my tap. Twice. I refuse to run that flywheel with those thread inserts. Quartermaster will be hooking me up to fix the issue and they are giving me new PP bolts as well for good measure. I talked to Jeff, and he said he would make sure all the threads will accept the pressure plates bolts before they are shipped out.

 

[twicks69]

Sounds perfect!

It should likely work out alot better.

Sorry to hear about the broken taps....

 

[BrokenTsi]

Actually, I decided to tap it. I havent done it yet, but it shouldn't be a big deal. I just have to go get a new tap. The last ones were pretty old anyways, so a new one should do better.

 

[WIDSM]

Bringing back a bit of an old thread I just came across but I to had a similar problem, though not as bad but there were some metal shavings coming out the backside of the flywheel. This is something that needs to be addressed by QM. Quality assurance is not something that should be lacking in a company selling drivetrain parts.

 

[twicks69]

I will notify them of these details so that they will hopefully improve their quality control.

Thank you for the feedback,

Tim Zimmer