Posted by Tom in MO on April 14, 2013 at 12:19:43 from (64.136.27.161):
I ran a compression test on my 1950 TO-20 today. (First time ever doing a compression test on anything. Thanks, O"Reilly loaner tool program!)
Dry numbers (1 through 4) were 90,90, 85 and 90.
Wet on #4 was 100, but it"s the only cylinder I checked wet - my pump oiler quit, and I didn"t have a good way to squirt a small amount of oil into the cylinders. (I didn"t want to make another trip to town today.)
I"m investigating a small coolant leak on the left side of the engine at the head gasket, between cylinders 1 and 2, as described in the linked thread below.
The previous advice was (a) check compression, and (b) re-torque head.
I didn"t think those compression numbers looked too bad, based on what I"ve read in the archives, so I"m inclined to retorque the head, while I have some other stuff apart, rather than jump into replacing the head gasket. Does that sound reasonable?
Also: the loaner gauge was designed to fit two different sizes of spark plug holes. On the TO-20, the smaller fitting just goes right into the cylinder, and the larger fitting threads into the spark plug hole, and seals with an o-ring.
The problem: the smaller fitting also has a o-ring, and at some point during the test the smaller o-ring disappeared.
I couldn"t find it on the floor, so I"m assuming it fell into one of the cylinders.
When I was through, I re-started the tractor, and after the smoke cleared from the "wet" test, everything seemed fine.
Should I worry about that where that o-ring might be?
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