Posted by TimWafer on February 09, 2008 at 12:06:08 from (24.213.199.167):
Maybe this sounds like a stupid bunch of questions but its not like they will be my first ones! I’m currently rebuilding my 51 H. I just dropped the head off this week at the machine shop. He is putting new guides, hardened seats and shaving it .050” Also refacing the lifters & rockers and doing the crank. The question came up about valve seals. I’m reasonably sure it was never rebuilt before and there were no seals on it so I’m assuming it never had them? Right?
I rebuilt an F-14 a few years ago and recall it had seals on the exhaust valves but don’t know the history of it so not sure if they were original. However I did NOT put any seals on it when I rebuilt it and it does not smoke at all. The H will have new guides and I’m also putting in all new valves as the old ones were in bad shape. Is it customary now to put seals on the valve stems and if so where do I get them? Good idea? Bad idea? Should have discussed it with the machinist but didn’t think of it at the time. What I don’t understand if there is a seal on the top, how does the valve stem get any lubrication at all?? I just never understood that! Tim Wafer
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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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