Posted by Hobo,NC on June 24, 2017 at 03:30:35 from (75.136.231.157):
In Reply to: Timing issue posted by BigK on June 23, 2017 at 23:03:07:
An old trick to see if valve timing is right on would be to remove lifter/valve cover and bring #1 cyl up to compression stroke. While you are rotating the engine coming up on #1 TDC, #4 should be on overlap (exhaust valve closing, intake valve opening). This should happen right on TDC #1. If a valve on #4 is wide open or doing nothing at all, the valve timing is off... weather it's the cam gear . crank, gear or key way, broken cam,etc. The reason # 4 is the cyl in question is because that is the "middle" cyl in the firing order 1-3-4-2. The "middle cyl should always be in overlap. for instance, on a chevy the firing order is 1-8-4-3-6-5-7-2, so if we wanted to see if the valve timing was off we would look at cyl# 6 to see if it was on overlap rolling the engine over to #1 TDC. It should overlap right at #1 TDC at 0 degrees
Master this and you will never b stumped again timing a engine
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