Clutchs

During my reading on our wonderful objects of affection, I have run across references to 9 & 1/4 inch clutch disks as well as the 8 & 1/2 inch ones for the F134 drivetrains.

Would these be a direct bolt on disk and cover plate, or do you need to replace the flywheel also? And would the larger clutch make that much difference?

 

I am not sure if it was originally this way, but the first Willys MB that I worked on had two sets of holes in the flywheel for two different sizes of clutch pressure plates. We were using the larger of the two. It had a l-134 flat head engine in it with the original transmission and tranfercase. This was in about 1974. I am sure that more knowlegeible folks that I will answear your question. Obviously on our Willys one could install two different sizes of clutch/pressure plate assembly. I am not sure why this was done, unless there was a shortage of the "proper" assembly during WWII? In any case, I would ASSUME that you would need different diameters of pressure plates for the two sizes of discs. Matt W.

 

The 9 1/4 clutch was a heavy duty oprion. To use it you will also need the flywheel.
The torque capacity with the 8 1/2 is 165 ft pounds and the 9 1/4 is 216 foot pounds.
At least this is what my Hollalnder interchange manual and my OEM service shop manual tells me. The 9 1/2 was an option from 1960 thru 1963 and was also used in the Henty J from 1951 thru 1954. It was also pretty much standard equipment behind the Six cylinders.
Hope this helps.
Cabover

 

You say the 9 1/4 was only available from 1960 to 63? Not to change subject, but I have a 56 with the 9 1/4 clutch setup. Of course it also has the t98, which some people say wasn't available till the sixty's, (and an IAT series distributor for that matter....the more I know the more it seems I don't have the original engine to my jeep)..... Anyway....when I went to get the clutch kit for my jeep, the guy at the shop said that the flywheel should be drilled for both sizes, (he only had the 8 1/2 in stock). I didn't have to remove the pressure plate, so I didn't look, (just replaced throw out bearing), but maybe some of them do, and some don't, like so many other options on early jeeps.

 

Didn't mean to confuse you. What i said was the 9 1/4 was an option in 60 thru 63. 8 1/2 was standard equipment. I'm sure that they had flywheels that were drilled for both. The 9 1/4 was standard equipment on six cyclinders and FC-170s. There was also different counts on the ring gear teeth.
The only way you will know for sure is to take it apart.
Your jeep is 48 years old. Who knows whats been added of removed over the years.
Good luck
Cavover