My SH has low hours but sat outside (nonrunning) for over 15 years before I purchaced it 10 years ago...Anyway,I recently ran a compressoin test.It only shows a consistent 60 lbs all cylinders.It does use some oil and occationally fouls a plug.What should be normal compression?The tractor runs great and seems to have plenty of power.Thanks,Steve
- Thread starter DeltaRed
- Start date
Dean Olson
Well-known Member
Both my SH's have 120-130psi per cylinder. 53 I rebuilt 2 years ago, 54 PO rebuilt 6 years ago.
60psi is essentially worn out.
You say it has "plenty of power." For what, though? Putzing around the yard doesn't take much power. You probably won't be too happy with its power output if you hook a plow to it, for example.
However, if it runs and does what you want, there's no reason to fix it just yet. You can dump a LOT of oil and spark plugs in it for what a rebuild will cost you.
You say it has "plenty of power." For what, though? Putzing around the yard doesn't take much power. You probably won't be too happy with its power output if you hook a plow to it, for example.
However, if it runs and does what you want, there's no reason to fix it just yet. You can dump a LOT of oil and spark plugs in it for what a rebuild will cost you.
Janicholson
Well-known Member
The issue is interesting in that there are variables that make our response valid -or not-. The first is that, the test cnditions must include: an open throttle, a good starting system that cranks the engine at 3 to 4 compression strokes per second, a leak free compression tester that is accurate (tested on a air source that is known pressure). If that is the case, and the engine was built with flat top pistons and a distillate head, I would say the readings are just a little low, but not much. If it was built as a gasoline SH (especially with domed pistons and or a big bore kit, it is at about 50% of normal.
My take is that if it provides good power as you need to use it as you do, leave it alone. Running simi synthetic 10-40 oil, and a one step hotter plug can be helpful in reducing the foweling. Jim
My take is that if it provides good power as you need to use it as you do, leave it alone. Running simi synthetic 10-40 oil, and a one step hotter plug can be helpful in reducing the foweling. Jim
Janicholson
Well-known Member
Be sure your process is as noted, and the gauge is close to accurate. It should be in the 110 to 125 range at altitude on the western slope. Jim
sallystractor
Member
t chances are the piston rings are frozen and letting oil up on the cylinder walls most likely the carbened up oil ring ,install some hot d-23 sparks plugs and gap em at 0.35 in my opion nice working tractor
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