Problem with 1964 MF 35 Z134 Continental engine,need some he

bcraig2N

Member
I changed the oil on the tractor today.

Also put on a spin on oil filter kit.

I did some bushogging for about 2 hours before changing the oil.

I had noticed before that there was a small amount of oily black residue underneath the outside of plug closest to the driver(#4)
There was a excessive black looking buildup on the electrode on the plug compared to the rest of the plugs which looked fine.
I noticed this when changing the Plugs a week or so ago.
I wiped it off and reminded myself to look again after I changed the plugs to see if it had come back.

Well sure enough it did and I could see a black liquid under the outside of the plug(maybe 3 or 4 drops of whatever it is )under the same plug.

I got off the tractor and watched the drops under the plug as I shut off the fuel to the engine.
The drops seemed to be jumping as though there was air pushing them as the engine ran out of gas.

What do you think the problem is ?

Thanks
 
So you are getting oil fouling on the electrode and you are getting oil on the ceramic portion of the plug? Put in new plugs with same effect. How does it run? Is it missing or smooth? Run a compression test and see if you are loosing pressure on that cylinder. Take a bottle of soapy water and spray it around the head where the plug screws in and see if it bubbles at all. Might have a crack in the head.
 
(quoted from post at 08:30:28 09/23/17) So you are getting oil fouling on the electrode and you are getting oil on the ceramic portion of the plug? Put in new plugs with same effect. How does it run? Is it missing or smooth? Run a compression test and see if you are loosing pressure on that cylinder. Take a bottle of soapy water and spray it around the head where the plug screws in and see if it bubbles at all. Might have a crack in the head.


I would also look at the surface of the head where the spark plug "gasket" seats. Make sure its flat, and has no pitting.
 
(quoted from post at 08:30:28 09/23/17) So you are getting oil fouling on the electrode and you are getting oil on the ceramic portion of the plug? Put in new plugs with same effect. How does it run? Is it missing or smooth? Run a compression test and see if you are loosing pressure on that cylinder. Take a bottle of soapy water and spray it around the head where the plug screws in and see if it bubbles at all. Might have a crack in the head.

I am getting oil fouling on the electrode but not on the ceramic part of the plug.where I am seeing oil is under the plug in the recessed part of the plug seat.

It seems that it misses sometimes,and sometimes it doesn't.

I took the plug out today and cleaned the recess where the plug shoulder seats then tightened it down more ,in fact I came to a spot that felt like the plug had bottomed out and would turn no more. I then ran the tractor for about 45 minutes bushogging and then looked and did not see any more oil.
I then pulled the tractor under the carport and just sat on it and listened, sounded alright for a couple of minutes and then starting to have a slight miss.
From what i noticed it SEEMS like the plug washer on all the plugs needs to be a slightly larger diameter.so there would be more area for the washer to but up to the recessed part on the engine ?Hope I am making sense here.

Thanks
 
(quoted from post at 08:52:52 09/23/17)
(quoted from post at 08:30:28 09/23/17) So you are getting oil fouling on the electrode and you are getting oil on the ceramic portion of the plug? Put in new plugs with same effect. How does it run? Is it missing or smooth? Run a compression test and see if you are loosing pressure on that cylinder. Take a bottle of soapy water and spray it around the head where the plug screws in and see if it bubbles at all. Might have a crack in the head.


I would also look at the surface of the head where the spark plug "gasket" seats. Make sure its flat, and has no pitting.

I checked and there does not appear to be pitting but it seems that the Autolite 3116 washer or gasket could be of a larger diameter for more surface area contact with the recessed area on the engine that it Butts up to.
Are there larger diameter washers available?

Thanks
 
No over sized ones that i know of. In all fairness though i have never needed any so never looked. I use those same plugs in mine and they seal up just fine. Did you do the soap test to see if it's actually leaking compression there?
 
You might be able to find a copper crush washer at place that works on diesel injection. A washer that fits on the plug like the washer that came on the plug, but has a little bigger outside diameter of that the washer that came of the plug. You could find a piece of shaft that just will just fit in the plug hole with a step a little bigger that plug washer, and clean up the seat on the head with a little lapping compound (just don't go crazy with the lapping compound).
 
(quoted from post at 07:56:45 09/25/17) No over sized ones that i know of. In all fairness though i have never needed any so never looked. I use those same plugs in mine and they seal up just fine. Did you do the soap test to see if it's actually leaking compression there?

No I haven,t got the chance to do the soap test yet but will try and do it tomorrow

Thanks
 
(quoted from post at 08:10:12 09/25/17) You might be able to find a copper crush washer at place that works on diesel injection. A washer that fits on the plug like the washer that came on the plug, but has a little bigger outside diameter of that the washer that came of the plug. You could find a piece of shaft that just will just fit in the plug hole with a step a little bigger that plug washer, and clean up the seat on the head with a little lapping compound (just don't go crazy with the lapping compound).

I think I will try and find a copper washer first.
Might even put a relatively thin washer in front of the original washer,would have the same effect as a slightly hotter plug right?
 
(quoted from post at 22:35:12 09/25/17) I think I will try and find a copper washer first.
Might even put a relatively thin washer in front of the original washer,would have the same effect as a slightly hotter plug right?


The washer doesn't change the heat range of the plugs. If you need a hotter plug because they are getting fouled try Autolite 386 plugs.
 
(quoted from post at 07:56:45 09/25/17) No over sized ones that i know of. In all fairness though i have never needed any so never looked. I use those same plugs in mine and they seal up just fine. Did you do the soap test to see if it's actually leaking compression there?

I did the soap test and it was difficult to tell anything definitive as the air movement with the tractor running was blowing the water and soap everywhere except where I wanted it !
 
(quoted from post at 22:58:53 09/25/17)
(quoted from post at 22:35:12 09/25/17) I think I will try and find a copper washer first.
Might even put a relatively thin washer in front of the original washer,would have the same effect as a slightly hotter plug right?


The washer doesn't change the heat range of the plugs. If you need a hotter plug because they are getting fouled try Autolite 386 plugs.

I looked at the engine seats where the plug washer butts up to and there is a Barely perceptible amount of roughness (hate to even call it pitting).
I cleaned them up with a Qtip best I could and when I can get some copper washers .

I did notice that the removable heads on the plugs(that the plug wires slip over) were loose.
Any solution to this issue other than just tightening them u with pliers?

I also saw that the first 3 plugs( coming back from the Radiator)looked fine with only the last plug having oil on it.

Also the 386 Plug you mentioned is a resistor Plug,will it hurt anything to run the Autolites(non Resistor)in the first 3 cylinders and the 386 (resistor) in the last cylinder?

Thanks
 
(quoted from post at 22:04:39 09/26/17)
(quoted from post at 22:58:53 09/25/17)
(quoted from post at 22:35:12 09/25/17) I think I will try and find a copper washer first.
Might even put a relatively thin washer in front of the original washer,would have the same effect as a slightly hotter plug right?


The washer doesn't change the heat range of the plugs. If you need a hotter plug because they are getting fouled try Autolite 386 plugs.

I looked at the engine seats where the plug washer butts up to and there is a Barely perceptible amount of roughness (hate to even call it pitting).
I cleaned them up with a Qtip best I could and when I can get some copper washers .

I did notice that the removable heads on the plugs(that the plug wires slip over) were loose.
Any solution to this issue other than just tightening them u with pliers?

I also saw that the first 3 plugs( coming back from the Radiator)looked fine with only the last plug having oil on it.

Also the 386 Plug you mentioned is a resistor Plug,will it hurt anything to run the Autolites(non Resistor)in the first 3 cylinders and the 386 (resistor) in the last cylinder?

Thanks

It won't know the difference.
 
(quoted from post at 22:21:07 09/26/17)
(quoted from post at 22:04:39 09/26/17)
(quoted from post at 22:58:53 09/25/17)
(quoted from post at 22:35:12 09/25/17) I think I will try and find a copper washer first.
Might even put a relatively thin washer in front of the original washer,would have the same effect as a slightly hotter plug right?


The washer doesn't change the heat range of the plugs. If you need a hotter plug because they are getting fouled try Autolite 386 plugs.

I looked at the engine seats where the plug washer butts up to and there is a Barely perceptible amount of roughness (hate to even call it pitting).
I cleaned them up with a Qtip best I could and when I can get some copper washers .

I did notice that the removable heads on the plugs(that the plug wires slip over) were loose.
Any solution to this issue other than just tightening them u with pliers?

I also saw that the first 3 plugs( coming back from the Radiator)looked fine with only the last plug having oil on it.

Also the 386 Plug you mentioned is a resistor Plug,will it hurt anything to run the Autolites(non Resistor)in the first 3 cylinders and the 386 (resistor) in the last cylinder?

Thanks

It won't know the difference.

Thank you much
 

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