Low compression + burned oil

[RMi]

My JD2010 has sometimes really little power, exhaust a lot light blue smoke and from the cylinder head outlet a lot of white smoke.
The measured compression is really low 70-50-60-50psi.
3 from 4 spark plugs are oily and black, one (1st cyl.) is good/brown.
So far refurbished the carb, checked and adjusted ignition, new oil, cleaned/replaced all filters.
Look like there's more work to do.
Suggestions? Where to start? In what order to proceed?
Valve clearance check/adjustments?
Valve or cylinder head overhaul?
New piston rings?

Any experience and recommendation is appreciated.

 

[Bob Harvey]

You could put an ounce (or more) of ATF into each cyl. and let it set for a few days. You may have something as simple carboned up rings and valves. Given the age, I suspect not. BUT, check the compression after the thing has set for awhile. Crank the engine over before you test, it will make a mess (easy to clean) and keep your tester viable. Hope I got this right and it is a gas engine. ;^)

 

[DONMYEIL]

Oh the woes of a 2010 owner . You could start by finding some fool to actually buy it from you . It needs a sleeve deck and new pistons, oil pump, rod and main bearings etc. . These are the top of the line John Deere money pit. There is no end; best advice I can give is to get a stick of dynamite down the exhaust . Sorry to be so sarcastic but I worked at a dealer for 40 yrs. and everybody ran the other way when one came in .

 

[buickanddeere]

Maybe able to limp along with straight weight 50 low ash motor oil with the two stroke Detroit diesel rating of SF-2.
A 195F thermostat will assist in keeping the engine warm enough to burn clean. Operating too cold without a stat or shutters causes rapid cylinder bore wear.

 

[ss55]

Gas engine? A leak down test could diagnose where the compression is leaking on each cylinder: past the rings, intake valve, exhaust valve or into the coolant.

 

[David G]

I would agree with the fact it is probably just worn out, best not to put money in it.

 

[David G]

It sounds like, AT LEAST, the rings are shot and you have a coolant leak into the combustion.

 

[RMi]