Bent push rods can be caused by only a few things. The first is that the valve stuck in the guide due to a lack of lube, or valve fitted to tight to the guide. Did you check the rocker arms to see if everything was getting lube when you first started the engine? If you had lube oil at the top of the engine dripping on the valves a little of that oil has to get in and lubricate the guides. With the engine cooled down are the valves with bent push rods free to move in the guides? You should be able to push them down by hand and the spring should return. Compare to other valves to see what I'm talking about. Let me know what you find. charlie
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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