Anonymous-0
Well-known Member
41' Farmall H that I had the head cleaned and valves done just last year. oil seems to be bubbling out of a sparkplug inlet and soot is on the hood from the exhuast. What is happening?
- Thread starter Anonymous-0
- Start date
Anonymous-0
Well-known Member
Sounds like its time for some piston rings...
There are only a couple of ways oil can get into a cylinder.
I've been ranting and raving about worn rings todays, so I'll list that one first. Worn rings simply allow oil to stay on the cyliner walls where it usually burns up.
The second way is through the top, down through the valve stems.
now, unless there's something on an H I don't know about - oil BUBBLING out of a spark plug hole... that's pretty extreme no matter what the cause.
The engine almost HAS to be hemoraging blue smoke when you run it, and I find it odd that you didn't mention that...
Is it?
Oil could just be dripping down from the valve cover to the plug holes. Are you SURE it's coming from inside the cylinder?
Soot build up can also be caused by running very rich, with lots of carbon coming out as black smoke from the exhaust.
I guess you need to describe it in a little more detail.
I've been ranting and raving about worn rings todays, so I'll list that one first. Worn rings simply allow oil to stay on the cyliner walls where it usually burns up.
The second way is through the top, down through the valve stems.
now, unless there's something on an H I don't know about - oil BUBBLING out of a spark plug hole... that's pretty extreme no matter what the cause.
The engine almost HAS to be hemoraging blue smoke when you run it, and I find it odd that you didn't mention that...
Is it?
Oil could just be dripping down from the valve cover to the plug holes. Are you SURE it's coming from inside the cylinder?
Soot build up can also be caused by running very rich, with lots of carbon coming out as black smoke from the exhaust.
I guess you need to describe it in a little more detail.
Anonymous-0
Well-known Member
engine sounds nice, starts easy and purrs when running. no smoke at all. I am not sure it is coming from inside the cylinder. It could be dripping from somewhere. Plug is in the hole, but when running it looks like small bubbles or air leaking from the seat.the oil gets spattered out from the pressure or fan maybe?
Russ from MN
Well-known Member
- Location
- Bemidji MN
Sounds like you need a new sealing washer on the spark plug to start with, then maybe new piston rings, or just seat the ones that you have. You didn't tell us if you did a complete overhaul or just the head.
Anonymous-0
Well-known Member
I just did the head. I did pull that one piston out (the leaky one) to check rings, which a tractor mechanic said were fine. I staggered the ring gaps and replaced the piston. This whole thing has been running good for about a year. the leak just started yesterday when pulling a load
In that case, I'm willing to bet it's leaking from the valve cover.
Oil is a funny thing, the way it leaks sometimes. It might not look like a drip, but more like a wet area. I'd blast the whole area with carb cleaner, wipe it all nice and dry. The keep an eye on it.
And as somebody else said - if you're getting air escaping past the spark plug, you might want to try new plugs - or tighten them a bit.
As for the soot, I'd clean that up too and keep an eye on it. If it builds back up, I'd back off on the gas mixture, lean it up a bit. (I'd double check the situation by yanking the plugs and looking at them. Are they black? - if so you're definitely running too rich)
Oil is a funny thing, the way it leaks sometimes. It might not look like a drip, but more like a wet area. I'd blast the whole area with carb cleaner, wipe it all nice and dry. The keep an eye on it.
And as somebody else said - if you're getting air escaping past the spark plug, you might want to try new plugs - or tighten them a bit.
As for the soot, I'd clean that up too and keep an eye on it. If it builds back up, I'd back off on the gas mixture, lean it up a bit. (I'd double check the situation by yanking the plugs and looking at them. Are they black? - if so you're definitely running too rich)
Allan in NE
Well-known Member
Normal
Allan
Allan
NoNewParts
Member
lots of oil getting past the spark plug seal
could be bad rings or scratched sleeve
or
in one engine I fixed,
broken piston skirts (it also smoked a lot)
(I could feel the pieces thru the oil pan drain hole)
when I tore it down, the reason for the broken skirts
was totally worn out wrist pin bushings
could be bad rings or scratched sleeve
or
in one engine I fixed,
broken piston skirts (it also smoked a lot)
(I could feel the pieces thru the oil pan drain hole)
when I tore it down, the reason for the broken skirts
was totally worn out wrist pin bushings
Janicholson
Well-known Member
Your tractor is (as Allan indicates) NORMAL.
The spark plug gasket is bad, or the plug is not torqued correctly, (put a tiny dab of silver Moly antisieze on the threads.) Oil is to be found inside the cylinder, condensed on the chamber walls (especially when the tractor is not run hard working and up to temp.) The same element is at work on the soot!
A cold tractor muffler condenses water, a cold tractor produces more unburned HC. The soot condenses int the water making a wattery black slobber that is propelled out the exhaust pipe.
Run it hard for an hour and it will go away.
It will come back every time the tractor is operated toodeling arouns and short run times.
Jim
The spark plug gasket is bad, or the plug is not torqued correctly, (put a tiny dab of silver Moly antisieze on the threads.) Oil is to be found inside the cylinder, condensed on the chamber walls (especially when the tractor is not run hard working and up to temp.) The same element is at work on the soot!
A cold tractor muffler condenses water, a cold tractor produces more unburned HC. The soot condenses int the water making a wattery black slobber that is propelled out the exhaust pipe.
Run it hard for an hour and it will go away.
It will come back every time the tractor is operated toodeling arouns and short run times.
Jim
Allan in NE
Well-known Member
Boy, I dunno Jim,
That spark plug hole is a direct window into that 1200-1500° combustion chamber and it is flat-out HOT.
Any grease on the plug threads or oil/grease around the outside of the plug is gonna melt and bubble.
It APPEARS to be "leaking", but actually it is just boiling off on the outside.
Ya see that a lot on tractors 'cause the plugs are "right there in your face" at eye level. :>)
Allan
That spark plug hole is a direct window into that 1200-1500° combustion chamber and it is flat-out HOT.
Any grease on the plug threads or oil/grease around the outside of the plug is gonna melt and bubble.
It APPEARS to be "leaking", but actually it is just boiling off on the outside.
Ya see that a lot on tractors 'cause the plugs are "right there in your face" at eye level. :>)
Allan
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