Flywheel threads

[67rcks]

Just wondering what is the thread on late model flywheels (like 87 gt) for pressure plate bolts. is it standard 5/16 or metric 8mm? Are these bolts hardened (SAE grade 8 or metric 10.9)?

 

[mrmustangman357]

late models are metric and hardened. you also need the pins for them too. ford racing sells them, check summit

 

[D.Hearne]

Ditto, the threads are metric, but the pins are not required for the pressure plate. They're good to have there, but not an absolute requirement.

 

[Rusty67]

Depends who you ask. Some manufacturers say that if you don't have those pins in your clutch WILL chatter. I don't have any personal experience without the pins but then, they are like 10 bucks for the package, cheap insurance.

 

[D.Hearne]

I've run one without the pins and had no problems.

 

[Rusty67]

I don't doubt it.

Out of curiosity was it a diaphram clutch or the earlier 3 finger style and how big was it ?

 

[D.Hearne]

It was the Centerforce dual friction set I'm still running in my 89 Ranger. 5+years now on this set. Looking like it's going to last another 5 . The lLong style pressure plates don't fit the bolt pattern on the flywheel (Ford iron 157 tooth)

 

[67rcks]

Do you know what is Ford specification on these bolts' torque? Is regular 20-25 lbs ok?

About the dowel pins I would definitely use them (they come with the flywheel anyway) clutch + trans work is no fun when no car lift is available (my case)

 

[D.Hearne]

25 ft/lbs is fine. That's what I torqued mine too. The bolts I have are Grade 9's though.

 

[67rcks]

DH as we talk metric did you use metric grade 9 (8.8) or metric equivalent of SAE grade 9 (most likely 12.9 but don't know for sure)?

 

[D.Hearne]

Huh, you've got me on that. Been a few years since I laid eyes on em. My Dad bought em for me at a bolt store down the road near where he lives.