CHECK HUB GAP ON A/C CLUTCH

[sam peterson]

yesterday being a sunny day I decided to get familiar with some of the workings on the cummins engine, so I decided to adjust the valves {hadn't been done for 30K}. It took me the most time to locate the timing pin. They couldn't have found a better place to hide it, and such easy access---Anyway while I was under the front of the motor I noticed that the gap on the a/c clutch hub was approx 60 thou. It is easy access so got some tools and removed the hub and took out shims to get gap to approx 20 thou. Because these clutches have a tendency to slip on hot days with increased pressure buildup I figure the life of the clutch was extended for a lot more miles. I recommend that all you guys look at yours and check the gap.

 

[jsimpson]

sounds like good advice. how much pressure does the spring exert in holding the clutch open? do you think that reducing the gap signmificantly increases clamping pressure?

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[sam peterson]

the closer the gap the easier for the magnet to engage the hub and also the flatter the engagement. if the gap gets to wide the magnet can't pull it in. the pressure of the flat springs has to be enough to disingage the hub when magnet power is shut off. the hub is on a tapered shaft of the compressor with a keyway. care should be taken when removeing the hub. if hub appears to be a little bent on reinstall it can be adjusted by bending the front face plate of the hub. 3 small buttons by the flat springs are for this purpose. tap in or out as needed.