Join Date: Apr 1999
Location: Justin,Texas, Republic of TEXAS (USA)
Feedback Score: 0 reviews
Sil-Glyde or 3M silicone paste is the slave pushrod grease of choice. I don't know how big a risk but regular grease getting onto the bore of slave (or master too) and getting onto the wall can get to the rubber of the piston and cause it to swell. Silicone sprays are usually 3 drops of silicone and the rest of the can is propellant and inert stuff. SO many of the aerosol lube products will wash away the remainder of what lube paste is there and end up making the problem worse.
Another thing from years of working on these: 7.3 PSD trucks with 6 speeds use that pilot bushing with needle bearing that rides on input shaft. The bearing failure scars the input shaft and a new bearing will fail quickly.
There is a sealed bearing, 6003-crs or 103-cc are some numbers for it in some brands, that fits into flywheel and has an ID for trans shaft that works. if you clean the shaft up. A sealed bearing for pilot is pretty common and I'm surprised they chose the needle bearing which is more problematic on all I have seen it used on. A brass bushing is better than the needle bearing.
The bore of flywheel where the pilot bearing fits is 35mm and the input shaft pilot diameter is 17mm the bearing is 10mm wide but it could be wider if you found the ID/OD the same.. Pilot bearing is not noisy enough to hear it with engine running in many cases. You hve to get truck on an incline, turn off engine, then put it in ger and depress clutch and let it roll. In 1st you will have a high speed at input shaft with rolling speed no faster than a walk. If the growling to squealing noise happens then it narrows it to a small list. Pilot bearing is most likely. A driveshaft support bearing could be noisy but it turns much slower than input shaft in this test. Release bearing (throwout bearing) is not turning when fly wheel isn't turning so that can't be the noise source.
I suspect the 6.0 with ZF-6 also uses this bearing but I have never put a clutch in a 6.0 truck. There are so few of them and the only ones I worked on did not need clutches before the owners got out of them.
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