Posted by Roland Phillips on April 30, 2012 at 17:24:12 from (173.26.41.234):
I’m early in the process of restoring a 1929 22-36. I’ve had the head done. The bottom of the engine is good. I cleaned and put the carburetor back together. It’s the side draft brass version. I’ve put it back together and got it running. It runs on three cylinders except for engine acceleration, that is, from a slow idle to a fast idle. During the acceleration, it hits on four, then back to three. The plugs in cylinders 1, 2, and 3 are dry and clean after running. Number 4 is not as clean and slightly wet. I’ve changed plugs (using both 3076’s and 3077’s). Plug wires are new. I’ve changed magnetos. The current magneto throws a good ¼ inch blue spark and starts and runs an F-20 fine. Compression on all cylinders is about 75 lbs., and can be verified by a hard pull on the crank through all four cylinders. I’ve squirted oil around the rear intake manifold gasket while it is running to check for vacuum leak with no change. I feel like it must be a vacuum leak, but can’t figure out where it could be considering the construction of the head (primers are gone with brass plugs in their place). All the valves operate smoothly and all have more than sufficient lifter to valve gap. I have three running F-20’s (one overhaul and lots of tweeking on them), so I’m familiar with the engine type. I’ve about run out of ideas and any help would be appreciated. If you think conversation is in order, send me an email and I’ll call you on my dime. Thanks, Roland
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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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