Engine Rotation Direction
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Tuned
Joined: Jun 2006
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From: Graham WA
Engine Rotation Direction
Did a leak down compression test tonight. After doing so my engine has a valve or lifter tapping. I rotated the crank by hand counter-clockwise to get to TDC with a compression whistle on each cylinder. When I fired it I had a tapping that was not there before. Is there harm in rotating the engine (by hand) the opposite direction from that intended? I have never really worried about hand turning an engine in the correct direction only. But, I can't come up with any other explanation.
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Any thoughts?
Tom
\Any thoughts?
Tom
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
On marine engines with their raw water pumps (rubber vaned impellers) turning them backwards is a no-no. But for land motors backwards is not a problem, at least in my experience (25 years as a professional mechanic).
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Tuned
Joined: Jun 2006
Posts: 363
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From: Graham WA
Appreciate the comment and your expertise. I didn't think backwards rotation should hurt anything. It's not like the cam lobes are differently shaped on the valve closing side or anything else I can think of.
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