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I sure would like to replace the old clutch on my 49 F2, when it comes to deal with the engine and transmission innards a bit more. Everything looks stock, but the 239 engine was replaced before, as it seems to be a 1950 or 51 model. Is there a quick and easy way to tell what size clutch is in it now? Could I measure the diameter of the pressure plate versus the flywheed through the inspection cover? What number would I get if a 9,10 or 11" clutch is installed?
I have all other parts at hand: Pilot bearing, throwout bearing, alignment tool, clutch shaft bushings…. do I really have to split the engine from the transmission, take everything apart and then wait several weeks for the clutch disk? I would love to put it all back together in one go.
A tough one, top of my head says 10 inch. The big IF is somebody's been in there before. I don't know how
you could measure anything through that small square hole unless you have a good friend at napa & buy a
10 & 11" disk and bring the wrong on back or keep it not that much money. usually napa get it in a day. Whatever = transmission still has to come out.......( and then I just could have a 9 inch) because yrs ago I
put a 239 car engine (9 inch) in a 50 F6 dump truck and that truck still going strong as I speak today. sam
The flywheel on a flathead is drilled for only one size clutch, so that is your determining factor. The 9 1/2" clutch was a passenger car only application. You're not going to find one in a truck that has a stock truck transmission as the input shaft diameter was much different. The 10" clutch was standard in the F-1 with the 3-speed light duty transmission, but the 11" clutch was an option and is interchangeable if the flywheel was swapped also. I believe that the transmissions offered in the F-2 and larger trucks were all paired with an 11" clutch, but again, the 10" will fit too so it's just an educated guess after almost 70 years of repairs and maintenance. The only way to know for sure is to pull it out and stretch a tape measure.
The input shaft would be from the 4 speed crash box, so that leaves the 10 + 11" clutch in the game. I have no way to compare, but the pedal is stiff as hell. Thus I am leaning towards the 11" cluch which would make perfect sense in the F2. Anyway, it might be best to get both 10" and 11" clutch disks. My wife will do a business trip to Ohio soon and I cannot miss the opportunity to get her getting a few parts over here. The left over one will sell here in Europe quite easily.
That an F6 under full load does not burn a 9" clutch is a little surprising, but then …. seemingly it works fine.
I have had to replace the clutch in my F-1 239. Understand you have an F-2 that may have a larger clutch. Please be wary of the diaphram (multi-fingered) pressure plates..........there is something about them that is wrong, there is something in the geometry of those pressure plates and they don't adjust to work.
I sent a lot of money, and busted knuckles to figure out they don't work.
Stick with a 3 finger pressure plate. Find a clutch re-builder, or read thru some of the old threads to locate where you can get a rebuilt clutch.
You should be able to tell by looking thru the inspection port on top of the bellhousing. An 11" pressure plate goes right to the edge of the machined surface of the flywheel, while a 10" is about 1/2" inwards of the edge. If you post a pic, I can tell you.
I can't recommend Ft Wayne Clutch highly enough as a source for your new setup. They really are head and shoulders above the usual crap. https://fortwayneclutch.com/
Anyway, it might be best to get both 10" and 11" clutch disks.
Just so we're clear, the clutch disc and the pressure plate are a matched set. A 10" clutch disc needs to have the 10" pressure plate to go with it, and vice-versa. A 10" disc won't work right with a 11" pressure plate, and you won't get an 11" disc to fit at all with a 10" PP.
I'll grab my camera and will post the picture Ross advised to do. If it is possible to tell the 1/2" difference in radius of an 11 vs.10" pressure plate against the fly wheel, my initial thought would work out and I can happily shop the right parts.
I sure would like to replace the old clutch on my 49 F2, when it comes to deal with the engine and transmission innards a bit more. Everything looks stock, but the 239 engine was replaced before, as it seems to be a 1950 or 51 model. Is there a quick and easy way to tell what size clutch is in it now? Could I measure the diameter of the pressure plate versus the flywheed through the inspection cover? What number would I get if a 9,10 or 11" clutch is installed?
I have all other parts at hand: Pilot bearing, throwout bearing, alignment tool, clutch shaft bushings…. do I really have to split the engine from the transmission, take everything apart and then wait several weeks for the clutch disk? I would love to put it all back together in one go.
best, Wil
C = F1/F100; D = F2/F250; Y = F3/F350 .. See 7550 in pic:
here are a few pictures though the inspection plate as Ross suggested. Bill, I could not find a part number on the pressure plate. That would have been
the easiest way to identify it. But it is full of dirt, up to now.
Whatever size this clutch is, it is huge. I can barely stick my little finger between the hexagon edge of the pressure plate basket and the bell housing.
I cannot imagine how an even larger one would look like. So, is this an 11 "clutch, Ross? Hopefully the pictures tell something.
The neck from the shift stick is in the way. Thus, no picture at completely right angle to the flywheel, which is still in the dark , unfortunately.
I agree, it appears to fill the bellhousing, so I'd say it's an 11". I'd be more confident if I could see the PP bolts in relation to the edge of the flywheel. Here is the only pic I could find of my 10" on a flywheel. Compare to the amount of flywheel you can see.
Anyway, you appear to have the crashbox 4-sp? They were only used with 11" clutches.
for your opinion on my clutch disc. If there is no such thing as a 10" cluch disk with a (1 3/8 ?) spline fitting the 4 speed spur gear, then of course it has to be the 11" I have now. I can't think of anything else, to be honest. I'll try to have a better look on the mounting face of the flyyweel, but I would bet the farm that my pressure plate exceeeds the dimensions you showed me in your picture of the 10" pressure plate.
Ford built your 4-speed transmission with an 11" clutch. Chances are that it's still an 11" clutch. But a 10" clutch and flywheel will fit. The depth of the cover and spline count/diameter are the same. If the engine got swapped at some point in the last 70 years, a smaller clutch could have gone in with it.
Let's say for discussion he bought the 11" clutch and finds the 10" has been replaced in it. Is the flywheel for the 10" clutch also drillable for an 11" clutch, or will he need to source a different flywheel?
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