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oil consumption

W

WW2N

Member
52 8N starts right up and runs great in all speeds 40 psi startup
working 30+ no lower then 20 psi warm idle. No smoke at startup.
Working faint tailpipe smoke.After sitting at idle, throttle up and
blue smoke is very obvious and goes back to just a trace when I go
back working with a blade on the driveway. It takes a few projects and
#2 plug fouls, clean it up runs fine no misses.It is using a good bit
of oil even seems to be liquid oil at the end of the tail pipe. No blow by none.
 
How badly do you want/need to fix this? Badly enough to do an overhaul or just a minor patch job? It could be nothing but valve guides, it might need sleeves, pistons, rings. The only way to be sure is to pull the head and do some measuring with micrometers. If you use the tractor a lot, spend the money to fix it. If not a lot, oil is pretty cheap so just keep filling it and cleaning #2 plug.
 
(quoted from post at 08:18:00 04/08/21)
(quoted from post at 07:15:32 04/08/21)

Valve stem seals
Click to expand...

Giving that a little more thought the valve guides on an L-head dont seem a likely source for the sort of oil use described. A broken oil control ring seems more likely. In any event time to pop the head and have a look. I am currently looking at the exact same problem on a 3 cylinder Kubota lawn tractor. Removing the head on it is going to be a much bigger job than on a flathead....

TOh
Click to expand...
 
We ran into a similar problem on my neighbors 8N. Good oil pressure but blowing smoke. There was some soot on the 3pt chain from the exhaust pipe. We put the engine on an engine stand last night. Pulled the head and there was a lot of wear in the cylinders. We ridge reamed the cylinders ,rolled over the engine get at the rod caps. We pulled the no. 2 rod cap off the rod and the piston fell right out of the cylinder. Never seen that before! I'm going out on a limb and thinking that is the cause of the engine smoking.
 
Valve seals but there should be oil burn on start up and is none and I think that it would need to be OHVT for that. I am thinking a oil ring and is that why no blow by? is the oil getting by on #2. I am using 15/40 Shell but its not a oil weight problem IMHO 90/140 I think would get by it. It should have visible blow by Right? Im open to more advice. The liquid oil on the tailpipe is not a good thing so whats that about----- stuck ring or rings.
 
(quoted from post at 16:58:23 04/08/21) Valve Stem Seal, Pack of 8 Part Number 8BA6571 Maybe thinking you dont
mean these.
Click to expand...

Despite the description those are not valve stem seals. They are valve guide seals and they seal air (manifold vacuum) not oil. This is a flathead not an OHV engine and there is no need for an oil seal on the valve stem.

TOH
 
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