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Pa/ny line | Put a new fuel pump on a 8.3 motor. I torqued it to 135 ft lbs and it keeps slipping time. Only slips time when the motor is working hard at full speed . What am I doing wrong ? |
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Leeds, North Dakota | Shaft and gear need to be clean, I use either, if its slipping not a good deal, possible taper is wore, correct torque? Scott. |
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Pa/ny line | I didn't clean with either.. Will try that. Thanks
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Northern ohio | 5.9 cummins has same pump and has the spec raised to 185 lb/ft to help stop the slipping |
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Herrick il | We had the taper not right on one wouldnt hold gear for anything |
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Garrett County, MD | You can find different torque specs for that nut.
I think the last one i did i tried to torque to 150 but i stopped shy bc i was afraid to strip it.
Ive done quite a few and never had a slipping problem. Just tightening by feel.
Worn taper or not tight enough is all i can think of. |
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Dearfield Co. | had a rebuilt from a big speed shop that did the same thing. I thought the shaft or the gear was bad and I called and griped . They said locktite it and torque it to 150 and that worked. It was on a 12 valve but the same principles should apply |
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| Ive seen this happen if an injector is plugged with debris. |
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Dearfield Co. | return line as well--------------the pump I did had lasor cuts and some speed secrets creating a higher load |
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South central MN | Could put loctite 609 on the taper as that's what they use on the cam gears on the isx/qsx. As Scott said, taper needs to be clean. |
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NW Central Ohio | ...clean shaft, Stud and Bearing Mount Loctite. Should hold it. (Loctite Primer is very good stuff too, helps make a good bond) |
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8.3 Cummins fuel pump gear problem
