924Board.org

[MikeDanger]

Well even if I did bent some valves, i would think i would hear the pistons hittin them, if not when it first happend, when ive tried to crank it later. I mean its not like they woudl have been bent out of the way and im sure they would flex a bit when they were hit.

But either way..
I have a fresh head ready to go, Its not so much the bent valve thing that i worry about as taking the head off, more specifically the exhaust manifold.

As for checking for the bent valves, does an air chuck just thread in? and how do i know when the valves should be in the closed position?

[Joes924]

squirt the bolts real ghood with a good quaklity penetratent for loosening bolts they not torqued on that tight its the rust
mine came off with only breaken 2 Im glad my p&p head didnt have that prob.Any way put on the pentratent the night before or even a day before you plan to loosen em. You can pick up the studs and lock washers and bolts pretty easy.

[Smoothie]

That's true - I'd expect some kind of banging or clicking noise. If this were happening to me, I'd just get the crank pulley fixed and on right, get the belt on and crank-cam timed and see if it goes. That's easy stuff. I'd be pissed if I went right in and took off the head only to find it's ok. It may be f'd, but do the easy work first just in case it isn't. One way to check for bent valves would be to check valve clearances like someone mentioned earlier. Any bent valves won't close completely and they'll have a much larger gap than they should. Valves are closed at TDC on the compression stroke. Cylinder #1 is there when the TDC mark on the flywheel is lined up.

[Paul]

To check the valve clearances, remove the camshaft cover and the valve cover. Turn the cam by its hold down bolt until the lobe is pointing up for the valve you want to check. (Never do this on a engine that has a good belt).

If you want to do the blow down check, then one at a time bring each piston up to top dead center, then turn the camshaft until both valves are closed. I use the hose from my compression tester, which just happens to have the same quick release connector that I use on my air hose. Pump in the air and listen for leaks.