Oil in your Fuel? LTR155, LTR 166 and LTR180: John Deere Lawn TractorsBy
Believe it or not, oil in the fuel can be caused by many different components on a tractor’s engine. You will want to make sure you check every possible cause in order to properly trouble shoot the issue. If you are seeing oil in your fuel, here are some areas you will want to check first:
1) Make sure you have no defective ignition components.
2) Check the spark plug: Do you have the correct one? Is the gap correct? Or maybe is it just time to replace it because it’s old or fouled.
3) Carburetor issues: Is it adjusted properly (you have it too lean), worn, plugged or have too much debris in it.
4) Does the air filter element have oil in it or is it clogged.
5) You may have worn or warped heads. If you have low compression, check the rings, valves and cylinder heads.
6) Is the choke, governor or throttle linkage worn out at all?
7) Make sure the carburetor is not set to rich.
8) Check on engine or valve seals. Make sure you don’t see any leaks at all!
9) Lastly, check the piston setup. Do you have broken or bent rings?
It will be best to first check what is easiest. If you see no glaring issues with the major engine components many times it’s a simple spark plug issue. So work your way through this list that way. Some things are just easier to check than others.