Posted by ScottyHOMEy on June 22, 2009 at 10:37:15 from (70.105.245.200):
In Reply to: M Stuck Valves posted by RickAshman on June 22, 2009 at 09:19:53:
If an inspection under the valve cover confirms your suspicions, you're on the right track.
There are better things than WD-40 for loosening them up -- any of the usual potions, ATF, Liquid Wrench has served me well, PBBlaster, Kroil . . . your choice on that.
If your push rods aren't bent, you can tell this after pulling them once you've removed the rockers) then the problem is a valve or valves stuck open. In that case, after a good soaking with your penetrant (a day or two) a little judicious tapping with a 12 or 16 oz. hammer to get them started in the downward direction can help to free them. It may take a heavier hammer to compress the springs, but the point is, reagardles of your hammer size, youu just need a little motions to free it up, and there is to be NO walloping! If you do detect a little motion, then apply more penetrating lubricant and tap some more. The tension of the springs will do the job of working them back upwards.
If the valve is stuck closed, I'd caution against prying up against the caps on the springs. In that case, I'd remove the spring (not easy with the head on!). Before any tapping, you need to turn the motor to get the piston on the cylinder in question to TDC. Happily, this is the same spot for both #1 and #4. With the pistons at the top and feeding through the plug hole, fill the cavity above the piston with all the small clothesline you can jam in there. This will hold the valve up enough to keep it falling so far that you have to pull the head to get it back. Then the valve springs can be removed without a danger of them falling down in case you've misdiagnosed. Once that's done, the same judicious tapping and relubing is called for. Once they've moved down, lube some more, pull them back up and reinstall the springs, caps and keepers.
Once you're confident they're all free, reinstall your push rods and rocker, do a quick check on the clearance and then turn it with a crank or the starter with the ignition off and watch to see that they're all operating.
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Today's Featured Article - Introduction to the Gibson Model D - by Brandon Burnett. The Gibson Manufacturing Corporation was founded 1946 by Wilber Gibson. The Gibson tractors were made from around 1948 to 1952. The picture shown here is of a 1948 Gibson model D. If you notice, this tractor is driven with a lever. You could get a attachment to convert it to a steering wheel.
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