Pilot bearing is vital to stability of the clutch and main nose shaft of the ZF.
Mechanical Catalog - 1989 - Ford - F350
Clutch, Clutch and flywheel, Pilot bearing, PILOT BEARING, Pick-Up $18.18 sell $13.36
93 F250 7.3 IDI S/C XLT 4X4 E40D 3.55LS, Captains chairs, Tutone Mocha, Leer 48" Hiboy cap, FR & RR hitches, full DeeZee running boards. Factory ordered/delivered Jan 93
Toys: 2006 37' Triple E Embassy coach (powered by Cummins), 18' Sylvan Pro Fish with Mariner motors.
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It's a needle bearing that comes from the factory? I was thinking that the factory calls for a bushing. Which is best? If the bearing falls apart, wouldn't the bushing be better?
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The hole in the end of the crankshaft is fairly large to fit the snout of a torque converter. So to fill that hole, there is a large cast iron bushing with a needle bearing pressed in. That is why I refer to it as a bushing / bearing. (Some older vehicles used a plain brass bushing).
The bearing is superior to a plain bushing, it's a matter of an anti-friction (roller) bearing vs friction (plain) bearing. Anytime the clutch is pressed in, the input shaft and crankshaft are turning at different speeds, the pilot bearing allows that speed difference.
The needle bearings are fragile simply because the walls are a thinwall design, and rely on the housing they are pressed into for strength. Once properly pressed into that housing, they are very durable.
I spent a few years in the bearing business and processed hundreds of thousands of the buggers from ones smaller than your pinkie nail to ones taller than you and me. So I know more than I care to on the subject.
1997 Ford F350 SRW 7.3L PSD
1985 Ford Ranger 2.3L 5 speed
1966 Mustang 200 I6, auto, 4 wheel disk, power brake retrofit, Corvette master.
Former vehicles, 1994 E350 7.3L IDI, 1985 International 1654 rollback, 6.9L IDI, (2) 1994 Ford E350 7.3L IDI, 1985 Ford F350 DRW 6.9L IDI, 1985 Ford F350 wrecker 6.9L IDI.
*dual ASE Master Certified, Automotive, Medium & Heavy trucks*
Owner / operator, Patriot Automotive, N Ridgeville OH
This input shaft repair kit eliminates the high cost of disassembling the transmission and replacing the input shaft, front bearing and race. The kit includes a Pilot Bearing with an additional 0.215 wear surface and a high grade lip seal to keep the lubrication in and dirt out. The repair sleeve is hardened for more durability.