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I'm trying to identify the correct 10 inch 10 spline clutch disc for my 8BA engine. The Ford shop manual '49-52..(mine might be a '48 engine) indicates a PN 51A-7550-A for my F-1 light duty 3 spd transmission.
When I search this part number I can't seem to come up with exact part measurements maybe because my disc is pretty worn?
I measure 10" diameter 10 spline disc at 1 1/8" inside diameter of spline but get greater than 1 5/16' outside diameter of spline. Even then it refers to a PN
29A-7550-A??
Any suggestions?? how accurate do these measurements have to be given a 10" diameter disc..10 splines and correct inside spline dimension of 1 1/8?
Unfortunately the disc I have is a "re-manufactured Borg Warner disc without a part # which I can't locate. BTW. the shop manual refers to specific colored disc springs. Color of my springs long gone..
Ford Cars didn't get the 8BA until '49, and a lot of parts places assume trucks were the same. '48 8BA's are exactly the same as '49-53, as far as the clutch goes. I don't know why the shop manuals cover '49-'51 but not '48.
Edit: edited due to incorrect info. See Joezzzz's reply below
As an example the autoparts store that I used had a clutch that looked liked it fit, except when you rotated the clutch on the pressure plate, (yes I did put in the right way) would hit the bolts that hold the flywheel to the crank. To make matters worse, the pressure plate fingers set lower by .200" and no matter what you do, you can't adjust that much.
If memory serves me correctly, Ford used the 1 3/8" ten spline clutch in passenger cars back in the 1930s.
Yes, but most passenger cars were 9" or 9.5" clutches. HD cars like police and taxi got the 10"
Meant to address the spring color question, here's a list of all the different colors used in the 8BA era. Mind boggling! Note the number listed for F-1 10", not sure what that is.
Pass. car 8 cyl 9-1/2 clutch ORANGE SPRINGS
Pass. car 6cyl w/o OD 9-1/2 clutch ALUMINUM SPRINGS
Pass. car 6 cyl with/OD 9-1/2 clutch BLACK SPRINGS
Pass. car and Taxi 8 cyl 10" clutch ORANGE SPRINGS
Police car & Taxi 6 cyl WO/OD 10" clutch ALUMINUM SPRINGS
Police Car & Taxi 6 cyl with /OD 10" clutch BLACK SPRINGS
Pass. car pressure plates 9-1/2 clutch GREEN SPRINGS
Police Car & Taxi 10" clutch BLUE SPRINGS
F1 19A-7563-A 10 inch Blue
F1 to F6 4 Speed 51-7563-A 11 inch Gray
F2 to F6 81B-7563-A 11 inch Brown
F7 & F8 7EQ-7563-B 12 inch Light Blue
Thanks to all for your replies..after further research into my clutch disc issue my '48 F-1 had a previous engine swap from an original flat head 6 to a Ford "car" 8BA..I think a 1949.
Having added to my confusion..is there someplace I can send what I have to be rebuilt avoiding a further headache?
Ok..let me see if I can solve my dilemma with the help from you guys again..
While I'm beating my head against the wall about determining the correct clutch disc for my 8BA engine..would you mind taking a closer look of the pictures (below) of my present disc. Does it even look worn and in need of replacement.
When I look at pics of similar new discs the new ones don't look (in terms of wear) any different than the one I have.
I just jumped to the conclusion that it needs replacement because each side of my disc shows every other pair of rivets near the top of the disc lining material. Again each side shows the same pattern of wear.
Hopefully I can put this matter to bed once and for all and continue on with my work.
Thanks
Appears to have a rebuilt sticker from an earlier life. The friction surface has very little life left. If I had it out, I would certainly replace it as it appears like at least one rivet is touching steel. The springs look ok. Should not be a problem finding a replacement disk, just verbally ascertain with the seller that any replacement would be the same spline count and outside diameter. What condition is the flywheel surface and the pressure plate friction surface? Replace the throwout bearing.
I'd say the disc is 50% worn. Are you going to replace the pressure plate too? If so, I'd say it's a no brainer.
I'm not sure why you are anguished about this? You must have a Truck trans (a Car trans wouldn't fit), which will have the 1- 3/8" shaft, and you have confirmed it's a 10" clutch. You should be able to buy an off-the-shelf disc. Here's a quick way to verify what you have, buy this alignment tool at OReilly's for $5, and try it on your old disc: Pioneer Inc. TAT5325 - Clutch Alignment Tool | O'Reilly Auto Parts
Thanks..I'll give this a try. Not replacing the pressure plate.
I guess the anguish stems from buying a part for $50+(and wasted time) only to find that it isn't the exact fit because I can't get the measurements to match anything I look at on line and there are many variations.
Humm..a truck trani in a car engine (8BA) maybe?
My disc measures 10" with 10 splines. Outside spline diameter is 1 5/16" and depth of spline is 1 1/4".
The inside spine to spline is 1 3/8" and 1 1/4" inside spine to spline.
Haven't found one disc that matches dimensions that I have so doing some homework to avoid do things over again.
Considering I grew up in a Manhattan apartment with a hammer, screwdriver and pliers in a kitchen drawer..no auto experience and working alone on the floor of my garage at 70 years old, I'd say I've come pretty far.
Can't wait to show you guys the finished product some day. Stay tuned.
Pretty common to have a Car engine in a truck, I have one! There's no fundamental difference other than water pumps, and sometimes the clutch diameter. Using the Truck flywheel solves that issue. But the Truck trannies are all 1-3/8.
