Slant Six Forum :: Hydraulic Throwout Bearing & Diaphram Clutch

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I purchased both the Ranger/Explorer 9 1/8 PP/Disk and 10 PP. Both have retaining bolt holes around 8.6 mm or just about .340" dia.

Sites list a Ford 10mm (.392") x 1 x 23mm bolt ATP ZX102 for the Ranger/Exporer/etc application but it's unlikely that will drop in a 8.6mm bolt hole in the PP. The Ford PP Bolts for 85 & earlier small block V8 were 5/16-18 and came in a set of 6 in ARP 150-2201 fastener kit.

Maybe the PPs were made with too small a bolt hole (6 total)?
or.....Maybe the sites have it all wrong on the Ford bolt size?
or maybe my measurements are off?

So the question is did you run into this diameter difference and substitute 5/16 bolts and threads? The .3125 bolts would be slightly loose in the PP hole in that case?

Obviously I'm trying to get the correct drilling/tap size for the flywheel determined. Seen a 9 1/8 drilling pattern? I'm measuring 6 equally spaced holes on a 10 1/4" diameter with 5 1/8 straight line distance between adjacent holes.
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Author:	DonPal [ Fri Jun 23, 2017 4:09 pm ]
Post subject:	Hydraulic Throwout Bearing & Diaphram Clutch
Anyone have a significant amount of slant 6 miles and shifts on a Hyd. throwout bearing in concert with a diaphram clutch with a 833od trans & 76 bellhousing? What/whose bearing and clutch did you use successfully?

Author:	Jerame_c [ Tue Jul 04, 2017 9:25 am ]
Post subject:
not with the hydraulic throw out bearing but with the diaphragm clutch. I'm using the larger of the two pressure plates that were used in the 2000 ford explorers with clutch disk and throw out bearing from a 10" Borg and beck three finger setup. the most important part of the throw-out bearing on your hydraulic is that its face needs to match the pressure plate. if the pressure plate is designed for a flat face throw out it will not last with one that is radiused and vice versa search inexpensive effective clutch in the forums for details on my build.

Author:	DonPal [ Tue Jul 04, 2017 6:10 pm ]
Post subject:
"search inexpensive effective clutch in the forums for details on my build." Thanks for lead. If Explorer used a hydraulic throwout bearing with the stock explorer diaphram clutch....would that be viable combo.....ie match on throwout bearing surface to PP?

Author:	DonPal [ Thu Aug 17, 2017 7:17 am ]
Post subject:	PP Retainer Bolt Size
"I'm using the larger of the two pressure plates that were used in the 2000 ford explorers with clutch disk and throw out bearing from a 10" Borg and beck three finger setup. the most important part of the throw-out bearing on your hydraulic is that its face needs to match the pressure plate. if the pressure plate is designed for a flat face throw out it will not last with one that is radiused and vice versa " I purchased both the Ranger/Explorer 9 1/8 PP/Disk and 10 PP. Both have retaining bolt holes around 8.6 mm or just about .340" dia. Sites list a Ford 10mm (.392") x 1 x 23mm bolt ATP ZX102 for the Ranger/Exporer/etc application but it's unlikely that will drop in a 8.6mm bolt hole in the PP. The Ford PP Bolts for 85 & earlier small block V8 were 5/16-18 and came in a set of 6 in ARP 150-2201 fastener kit. Maybe the PPs were made with too small a bolt hole (6 total)? or.....Maybe the sites have it all wrong on the Ford bolt size? or maybe my measurements are off? So the question is did you run into this diameter difference and substitute 5/16 bolts and threads? The .3125 bolts would be slightly loose in the PP hole in that case? Obviously I'm trying to get the correct drilling/tap size for the flywheel determined. Seen a 9 1/8 drilling pattern? I'm measuring 6 equally spaced holes on a 10 1/4" diameter with 5 1/8 straight line distance between adjacent holes. I've found the stock Ranger/Explorer 9 1/8 disk appears to fit the slant flywheel. Since I just had a B&B disk come apart (rivets pulled out, hub halves separated, springs let loose, and hub cracked thru rivet hole and broke into two pieces......I'm not anxious to use another B&B disk. I'm going with the Ram 78125HD hydraulic throwout bearing which is flat faced and has a great diameter match to the ford 9 1/8 PP fingers. The 833 od input bearing retainer collar must be built up from 1.25" to 1.37" to use that unit but Ram good reviews seem to exceed reviews of the McLeod more expensive throwout when it comes to leak potential. The Ram also uses a guide pin off the retainer which feels more secure than the loosely installed 1400 series McLeod unit.

Author:	DonPal [ Sat Dec 30, 2017 1:31 pm ]
Post subject:	Hydraulic Throwout Bearing Installed and Testing-Overview
Hydraulic Throwout Bearing installed on the 65 Dart 225 with 833 OD & has been tested for several months. Have an "Overview" with assembly pictures and list of major components used (call it part 1): http://www.plymouthcarclub.com/2017/12/ ... -retrofit/ Part 2 with details & step by step machining/assembly to follow when the weather socks us in again

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Hydraulic Throwout Bearing & Diaphram Clutch https://slantsix.org/forum/viewtopic.php?f=20&t=61291	Page 1 of 1

Author:	jcc [ Sat Dec 30, 2017 5:09 pm ]
Post subject:	Re: PP Retainer Bolt Size
DonPal wrote: " I purchased both the Ranger/Explorer 9 1/8 PP/Disk and 10 PP. Both have retaining bolt holes around 8.6 mm or just about .340" dia. Sites list a Ford 10mm (.392") x 1 x 23mm bolt ATP ZX102 for the Ranger/Exporer/etc application but it's unlikely that will drop in a 8.6mm bolt hole in the PP. The Ford PP Bolts for 85 & earlier small block V8 were 5/16-18 and came in a set of 6 in ARP 150-2201 fastener kit. Maybe the PPs were made with too small a bolt hole (6 total)? or.....Maybe the sites have it all wrong on the Ford bolt size? or maybe my measurements are off? So the question is did you run into this diameter difference and substitute 5/16 bolts and threads? The .3125 bolts would be slightly loose in the PP hole in that case? Obviously I'm trying to get the correct drilling/tap size for the flywheel determined. Seen a 9 1/8 drilling pattern? I'm measuring 6 equally spaced holes on a 10 1/4" diameter with 5 1/8 straight line distance between adjacent holes. . I think your bolt dim's are correct, why can't we solve the problem by taking an alloy allen bolt and undercutting the head on a lathe to the needed new diameter for say a 1/16"? shoulder? Obviously the deeper the shoulder the better the engagement, but the weaker the fastening strength of the reduced head, ie a tradeoff, but a solution?

Author:	DonPal [ Sat Dec 30, 2017 8:16 pm ]
Post subject:	Bolt Hole Size Versus PP Hole Size
Shoulder on bolt would have to be fairly precise on thickness as you pointed out. Testing is now proceeding with the 5/16 Ford bolt in the slightly oversize PP hole. When you consider the accuracy in locating the holes it's likely the some of the bolts are up against the PP hole and preventing rotation/whipping of the PP even when ignoring the clamping force? I located the holes two different ways and confirmed position with one method against another which I will cover in Part 2 of the writeup at http://www.plymouthcarclub.com/2017/12/ ... -retrofit/ on the install. Still I believe it's possible to be off 1/32 on the hole center of one or more bolts. It would be good to know however what the practice was on the factory new Ford Ranger as far as bolt size versus PP hole size. There is even the possibility that metrics are used to make the PP holes by some aftermarket company? Hopefully my ongoing testing doesn't find this hole versus bolt size as an issue effecting reliability.

Author:	Exner Geek [ Sun Dec 31, 2017 5:53 pm ]
Post subject:	Re: Hydraulic Throwout Bearing & Diaphram Clutch
If the holes in the pressure plate are larger that the shoulders on the bolts you have to use maybe you could drill some holes through the pressure plate into the flywheel and press in some 1/4" dowels. Balance could be an issue if the pressure plate isn't concentric on the flywheel.

Author:	jcc [ Mon Jan 01, 2018 9:17 am ]
Post subject:	Re: Hydraulic Throwout Bearing & Diaphram Clutch
The dowels are an interesting solution, and relatively easy for a one time solution, in that a replacement PP would require an identical match for dowel placement, and if one is going to all that trouble, might as well fix it right from the start.

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