how do you adjust the valves on an AC 2900 motor?

hubbub · Feb 5, 2015

My uncle bought a AC 605B Loader and needs to adjust the valves... I did a little keyboard commando work for him (he's about as tech savy as Fred Flintstone) and found that the 2900 engine was used in a lot of AC farm equipment. Can someone post directions or a link to the procedure.

Thanks!

Edit* This loader uses the same motor as a 7010 tractor. Also my Uncle has adjusted valves on Cat equipment as well as Cummins truck engines but this is his first AC.

screwloose · Feb 7, 2015

Run engine up to temperature. Take valve cover off. Rotate
engine until #6 cylinder exhaust valve closes and adjust both
valves on #1 cylinder. Actually #6 cylinder valves, both of
them should be closed but with no clearance, it's called
overlap. That way you know #1 cylinder is at tdc. Then rotate
engine 120 degrees until #2 cylinder exhaust valve closes and
adjust both valves on #5 cylinder. Rotate engine another 120
degrees until #4 cylinder exhaust valve closes and adjust both
valves on #3 cylinder. Rotate engine another 120 degrees until
#1 cylinder exhaust valve closes and adjust both valves on #6
cylinder. Rotate engine another 120 degrees until #5 cylinder
exhaust valve closes and adjust both valves on #2 cylinder.
Rotate engine another 120 degrees until #3 exhaust valve
closes and adjust both valves on #4 cylinder. All valves are to
be .015 hot.

hubbub · Feb 7, 2015

(reply to post at 04:20:03 02/07/15)

Thanks a million! I'll get the info to him so he can knock it out.

Michael V (NM) · Feb 9, 2015

one more thing to add, do not adjust or check valve clearance with the engine running

how do you adjust the valves on an AC 2900 motor?

hubbub

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screwloose

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hubbub

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Michael V (NM)

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