Oliver 550

redbull · Jan 20, 2019

I recently bought an Oliver 550, It cranks almost immediately but has a miss, I took the plugs out and one has a little oil on it and all of them are
smutty so I guess it is running to rich. I did a compression test and they checked from 135 to 145, the one with the oil checked 140. Is this about
right for the compression, also what is the right spark plug for this tractor ? Thanks

J. Schwiebert · Jan 20, 2019

You are good on compression. 120 is the minimum. Less than 10% variation. Plugs, no idea anymore.

mechknit · Jan 21, 2019

Use champion D-21 or equivalent.

Oliver 550

redbull

Member

J. Schwiebert

Well-known Member

mechknit

Member

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