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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 12-30-2006, 01:45 PM   #1 (permalink)
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bearing replacement for pilot bushing?

Does anybody know where to find this? Is it really that significant? Maybe a part number?
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Old 12-30-2006, 03:12 PM   #2 (permalink)
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Re: bearing replacement for pilot bushing?

Pilot bearing is vital to stability of the clutch and main nose shaft of the ZF.
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Clutch, Clutch and flywheel, Pilot bearing, PILOT BEARING, Pick-Up $18.18 sell $13.36
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Old 12-30-2006, 04:23 PM   #3 (permalink)
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Re: bearing replacement for pilot bushing?

The pilot bearing is what holds the weight of the clutch disk up.... Yep it's important.

I recommend replacing the whole bushing / bearing assembly (rather than the needle bearing itself) because the needle bearing is easily damaged if not pressed in with a special tool.
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Old 12-30-2006, 05:50 PM   #4 (permalink)
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Re: bearing replacement for pilot bushing?

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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Old 12-30-2006, 07:09 PM   #5 (permalink)
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Re: bearing replacement for pilot bushing?

[ QUOTE ]
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?

[/ QUOTE ]

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.
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Old 12-31-2006, 05:43 PM   #6 (permalink)
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Re: bearing replacement for pilot bushing?

http://cgi.ebay.com/ebaymotors/Input-Pil...72788QQtcZphoto

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.
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