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Camshaft R&R checklist with Valve seal replacement added 700 1990

posted by  rstarkie on  Fri Feb 22 14:16 CST 2008
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last visit: Fri Oct 24 10:14 CST 2014
[RELATED]

Since I do not have air at home, the rope trick is in.

I am sorry but the rope trick will not work for this procedure. The rope trick is a way of preventing the piston from moving beyond TDC when you are attempting to remove the crankshaft bolt so that you can remove the crankshaft pully/vibration dampner- it "locks" the crankshaft.

When you remove the spring tension on the valve it will want to fall into the cylinder. The compressed air will create enough pressure that the valve will be forced to stay closed. It is also necessary to lock the crankshaft so the air pressure will not force the piston down (although I imagine the piston could be at bottom dead center since with the cam removed the valve will not respond to crankshaft movement).

I do not know of a way to change the valve stem seal with the head in place without using compressed air to pressurize the cylinder and hold the valves closed.

Randy






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