My engine was missing so I performed the following to hopefully clear up the problem:
Cleaned and "rebuilt" the carburetor
Replaced all wiring from plugs to distributed cap and cap to coil
Replaced distributor cap with new points, plugs and condenser
Adjusted the valves
Adjusted timing
After this the engine now starts instantly but is still missing and after three hours of operation, the plugs are coated with carbon.
I took a compression test and here are the results:
1 2 3 4 Cylinder
75 75 75 75 Dry cylinder psi
82 86 80 80 Capful of oil in cylinder
When I did these tests the compression jumped up in jerks from about 50 psi or so to the final value.
I know these values are low but this tractor still pulls a plow. Do these values mean I will most likely have to change the rings and work on the valves in order to correct my missing problem?
Thanks for your help which is most appreciated.
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Engine missing
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- John *.?-!.* cub owner
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Re: Engine missing
As you said, those readings are low, and I am assuming you got them using the starter and with throttle wide open. Since the wet test only came up a little that indicates the valves need adjusted or lapping, or both. Those readings should not cause it to miss. For that you probably need to look into ignition, plugs, wires, points, rotor cap, etc. to find the problem.
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Re: Engine missing
John *.?-!.* cub owner wrote:As you said, those readings are low, and I am assuming you got them using the starter and with throttle wide open. Since the wet test only came up a little that indicates the valves need adjusted or lapping, or both. Those readings should not cause it to miss. For that you probably need to look into ignition, plugs, wires, points, rotor cap, etc. to find the problem.
John, he replaced the wires, plugs, etc. I agree that it's likely a valve issue. Probably were last serviced, during the Eisenhower administration. If your compression tester has a quick connect on it, it may fit an air compressor fitting. Mine does. Put air pressure into the cylinder, with the valves closed, and listen for leaking air, at the manifold, intake and exhaust sides. This will tell you if the valves are sealing.
Ed
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Re: Engine missing
You mention new plug wires, but not new plugs. How old are the plugs?
Michael Cummings
Eddie - a 1959 International Lo-Boy named after my father in law, who who bought her new.
Eddie - a 1959 International Lo-Boy named after my father in law, who who bought her new.
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Re: Engine missing
bythepond88 wrote:You mention new plug wires, but not new plugs. How old are the plugs?
New plugs listed in his first post, at the same time as the other "tuneup" work.
Stan in LA (lower AL)
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Re: Engine missing
Oops!
Michael Cummings
Eddie - a 1959 International Lo-Boy named after my father in law, who who bought her new.
Eddie - a 1959 International Lo-Boy named after my father in law, who who bought her new.
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Re: Engine missing
Thank you all for your kind help!
Here is what I am going to do:
1. Test the coil since it is new.
2. Do "The Ignition Stress Test"
3. If the test doesn't fail, then I am going to pull, inspect and clean the valves and lap them. Depending how things look in the bores, I may replace the rings and bearings.
It may take a month or two, but, I will let you know how I make out.
Thanks again for all the kind help!
Here is what I am going to do:
1. Test the coil since it is new.
2. Do "The Ignition Stress Test"
3. If the test doesn't fail, then I am going to pull, inspect and clean the valves and lap them. Depending how things look in the bores, I may replace the rings and bearings.
It may take a month or two, but, I will let you know how I make out.
Thanks again for all the kind help!
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