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When the crank in placed in time on the bottom mark and the cam pulleys and on timing marks could the crank be 180 degrees out or is the piston at top dead center the same on the compression and exhaust stroke? I suppose the cams determine which stroke?
 

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Read your post back - if you place the crank "in time on the bottom mark", can it be 180* out?

All "top dead center" means is that a piston (usually #1) is at the very top of it's stroke, it does not say compression or exhaust, and ideally, when people use the term they should specify which cylinder and which stroke, but many don't.

Yes, it is the cam that determines whether it is the compression or exhaust stroke.
 

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Ugh...it would help if you provided the model, year and engine type. :huh:

Read the top post in this section, for starters.
 
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