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Turning engine for valve adjustment

December 15, 2015, 08:42:57 am

I wanted to adjust the valves on my 8.3 cummins,but did not have a turning tool.The PO did mark the harmonic balancer.

I first took off the hyd pump belt,then unloosen the 4 bolts holding the pulley to the balancer then remove pulley.

This will reveal 4 bolts spaced about 5" apart,simply put a 18mm socket on one of the bolts and you can easily turn engine
over.

Only takes a few minutes.

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Re: Turning engine for valve adjustment

Reply #1 – December 15, 2015, 10:10:40 am

How about the second part?    How far out were they? Exhaust vs intake? Miles/years since previous adjustment?

Pierce

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Re: Turning engine for valve adjustment

Reply #2 – December 15, 2015, 10:14:32 am

When you reinstall that pulley, spend some time ensuring it is concentric. Mine was mounted slightly off center and was causing bouncing in the tensioner. Use a piece of chalk or dial indicator to find the high spot. Chalk/wax marker workers fine, just start engine up and move it closer till it hits on the high spot.

I made a thread about the process a while back.

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Re: Turning engine for valve adjustment

Reply #3 – December 15, 2015, 10:51:14 am

Not sure when last check was(po passed away)but every valve was right on the money,.024 and .012,engine has 207k,
underside of valve cover looked like new.

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