Cummins 6BT-5.9 (1988) Valve Adjust Question

[Joseph C Wharton]

I reviewed the Cummins factory manual I have on this engine – preparing to do the first 1000 hours valve adjustment. Manual describes how to use the pin to establish TDC, but does not say anything about any need to insure TDC is at top of compression stroke or top of exhaust stroke.

I know from past work on gas engines, this was critical – maybe I am over thinking this here.

Cummins manual has diagrams to say which valves are adjusted first (both valves on cylinder #1 + others), and which ones are adjusted after a 360 degree crankshaft rotation.

Is it true that the cam would be off of both valves on #1 irregardless of which TDC I am at?

My friend Andy and I thank you for all your help over the years.

Topic

[Joseph C Wharton]

The light bulb just came on ….

OH – so the TDC pin goes int a hole on the camshaft – that explains everything. Many Thanks.

[mark gaudy]

No it’s not true, that is why they don’t tell you to adjust the valves on the sister cylinders, so don’t do that.
The pin hole is on the cam gear, so when the pin is in the hole, TDC is the top of compression stroke, no confusion possible. Have fun!

[Author]

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