Reply To: 1931 Model 42 Mosquito Sprayer

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Here’s the exhaust valve from #4. There is an area that has enough deposit on it to raise the valve. Measured clearance was .013 and it was originally set at .008 cold. This deposit scraped off and I’m sure that I’ll be able to lap the valve in without any problem. These are all original valves, so I don’t want to have them ground if I can avoid it. While the valve is not burnt,I could hear the starter skip a beat when cranking the engine and that told me to check compression. Cranking pressure on this cylinder was 30 lbs. The others ran from 60 to 80.

The head is now fully cleaned and I’ll work on the block this weekend. If all goes well, it will be back together on Monday.

Bill