How can you tell if a piston is TDC?
A more accurate way to locate (TDC) is by using a piston stop tool. Screw the tool into the #1 spark plug hole by hand; and then slowly rotate the crankshaft by hand until the piston come up against the stop.
How do I verify my TDC?
Look into the hole with a flashlight to find TDC. Once your thumb has been pushed off the spark plug hole, use a flashlight to peer down into the hole at how close the cylinder is to the hole itself. Have your friend rotate the motor very slowly as you watch to get it as close as possible to top dead center.
What should the timing marks be on a camshaft?
After you have installed your crankshaft and camshaftand connected the two with your timing set, take a moment to make sure you have your cam installed “straight up,” which means the tick marks on the timing gears point toward each other. At this point, the camshaft should be installed as your cam manufacturer intended.
Where to find alignment mark on camshaft sprocket?
The camshaft sprocket alignment mark is visible through the opening in the front distributor housing cover just above the distributor cap. When the letters “OT” are visible in the window, continue to rotate the engine clockwise until the scribe mark (line) beside the “OT” is aligned with the tab inside the window.
How do you find the mid point of a camshaft?
To be absolutely sure, take a point either side of full lift, say 0.020” before and after, note the protractor readings at these two points, add the two readings together and divide by two. This will give you the true angular mid-point position.
When does a cam line up with the crankshaft?
When a cam is installed “straight-up,” the imaginary centerlines of the two shafts line up exactly. Advancing or retarding the cam pushes the centerline of the camshaft to one side or the other of the crankshaft centerline.