Exhaust Pushrod Problems
#11
Hey all. Thanks for the ideas. It was an existing cam, so no issue there. Gunny, your way is the same as mine.
My biggest concern was that the valve timing could have somehow changed when I pulled the jugs. I'll try reassembling and check lift on the exhaust lobes of the cam. If the lift and the timing seem right then I'll try readjusting the pufhrods.
Thanks.
My biggest concern was that the valve timing could have somehow changed when I pulled the jugs. I'll try reassembling and check lift on the exhaust lobes of the cam. If the lift and the timing seem right then I'll try readjusting the pufhrods.
Thanks.
Go top dead center on compression stroke. Must be compression stroke, or you have no hope.
Take up any up and down play in the pushrods with adjustment.
Then add required turns from there to load the lifter. This is not rocket science. A lifter will work just fine anywhere within it's stroke. Shoot for 50% compressed as the average.
Don't go by using the spin the pushrod method as they will always spin as the lifter bleeds down to the point of full compression of the lifter. If you adjusted this way, the valve will never close and could hit the piston when you rotate the engine on a valve overlap cycle.
Tip. To find tdc on that particular cylinder rotate engine in the correct direction and watch the intake lifter. It will come up in the bore and then start to go down. Now go over to the spark plug hole and watch piston. When it comes to the top , you will have tdc on compression. Now do the adjustments for both intake and exhaust at the same time. Don't get caught up in those rediculous solid lifter adjustment proceedures and it don't apply. As long as a hydraulic is adjusted on the base area of the cam, they could care less about where the intake and exhaust is.
Since you have bent two pushrods already, take note that the valve that the bent pushrod was operating is actually closing and not bent. If you have no other method, use a rubber hose and blow into the sparkplug hole with your mouth to see if there is resistance indicating both valves are closed and will give compression. If not, the valve is bent and you need to dig deeper, since you will never be able to adjust the lifter correctly, and the valve will likely hit again anyway bending another pushrod.
Ron
Last edited by rbabos; 06-06-2009 at 10:22 AM.
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