I have a vintage 1967-70 john deere 112 with a I believe is a 8hp Kohler engine I did a compression test and I got a 82 pound reading is that good and will the engine start with that reading ?? I appreciate any help johnny
I work at a dealership and 112's could have either a Tecumseh or Kohler.
Can you verify what engine you have? I have attached the serial number and engine info below.
To answer your question, the engine may run at that compression depending on what's wrong.
For instance, my 1964 110 (that my great-grandfather bought new) had similar compression a few years ago. It would run, but I couldnt adjust the carb enough to get it to run smoothly.
Long story short, I did a leakdown test on the engine and discovered the valves were leaking. I removed the cylinder head and did a valve job, and it has been running great ever since.
On the other hand, I had a 1973 model 140 a few years back that also had a Kohler with similar compression. It's issues were a mixture of valves and worn rings.
The engine would run, but it was low on power and had blue smoke coming out the muffler and crankcase breather as it ran. That engine got a full rebuild.
I would recommend doing a leakdown test on your engine and see where it's leaking.
1. If air blows out the carb, the issue is the intake valve.
2. If air blows out the muffler, the problem is the exhaust valve.
3. If air blows out the dipstick tube, then you have worn rings.
4. You may have air blowing out one or more of the above, but at least you will know what the issue is.
This test will eliminate any guess-work and help you pinpoint the issue.
If you have a Tecumseh, they were known for needing to adjust the valves more often than a Kohler.
Hope this helps!
Will