blackbird307

Good evening everyone,

I am currently in the process of changing my timing belt. So far so good.

i understand when the engine is at top dead Center the camshaft pulley should have “up” stamped indicator showing and the two notches lined up with horizontal plane of cylinder head. However when I’m turning the engine over, I watch the valves. To me compression stroke occurs after the intake valves open, piston goes down, valves close, piston comes up, bam top dead centre. However when this is the case my “up” mark is at the bottom of the pulley. The crankshaft has to make two complete revolutions for the camshaft to make one.

Is my camshaft pulley off 180 degrees? I just finished changing the timing belt and everything went smoothly otherwise and at no point were the camshaft and crank shaft turned independently from each other. Also if it was off 180 degrees, my crank shaft wouldn’t be able to make a complete revolution if it was impacting the valves?

i don’t want to grenade my engine, so I’m being extra careful. Might be over thinking it. Thought I would run it by a forum before turning the key. Timing marks all line up. It’s just the guide that came with my kit states that cam shaft “up” and notches would indicate top dead centre #1 cylinder firing compression stroke. Which doesn’t same to be the case here.

So maybe I’ll pop the transmission rubber cover and double check flywheel marks.

Thank you,

hondamark35

With crank at TDC and cam gear lined up with "UP" at top, all valves on #1 should be closed (rockers are loose, this is when you would adjust valve lash on #1). The camshaft would have to be machined wrong (keyway is in the wrong place...?) terribly unlikely.

But if you are looking at cylinder #4 (near the distributor side) it will be at TDC on compression with the pulley showing "UP" at the bottom like you're describing. cylinder #1 is on the timing belt side.

nicolaselias

Great advice above, I always have to remind myself every time the order of the cylinders