Piston stop ignorance, what am I doing wrong

5182 Views 8 Replies 5 Participants Last post by Bluegoose1970, Aug 29, 2013

Steve Johnson

Discussion Starter · Aug 26, 2013

Installing a Cloyes true roller timing set and I'm looking for TDC on the #1 piston. So do I rotate the crank until the sprocket mark is at twelve and run the stop in and get all happy :hurray: when the it doesn't go in it's total length or do I screw in the stop and get happy when I rotate the crank by hand and I can't turn the crank any farther? Seems to me that depending on how much I screw the stop into the cylinder that I could have the piston make contact before It reaches it's highest point.
what am I missing here

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Bluegoose1970

· #9 · Aug 29, 2013

Steve Johnson said:
Let's try this from a different angle. A piston stop will get me in the neighborhood and then I should remove it and put my crankshaft timing mark at 12 o'clock. Since I am doing a cam change only on a good running engine I should be able the trust that the crank is right. So if the dot on the camshaft pulley is directly above the O on my Cloyes true roller timing set I can set my degree wheel to zero and degree the cam. Does this sound right?

To START align 0 deg marks on crank and cam gear, THEN you need to find TDC. The video link I have shows how to use a piston stop, there are others, this one is for determining if balance mark is correct. You are using a degree wheel, install degree wheel with a wire pointer that can be bent . Use the piston stop, find TDC. Adjust wheel to TDC, then degree cam. There are lots of videos on this, most have heads off.
Again video link is to show how to use a piston stop.

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