#4 plug saturated with oil on VAC

york · Jul 3, 2016

I will start with my first problem. #4 plug had no compression, I found rocker arm broken. Replaced rocker arm now I have good compression. But now the spark plug is saturated with oil and fails to fire. I know oil could be coming from broken cylinder oil ring or it could be coming from a worn valve seal. I don't understand what caused a broken rocker arm in the first place, no bent push rod, valve opens and closes just fine. But could the broken rocker arm indicate a valve condition causing oil to enter the cylinder. Any way to determine cause of oil saturating the plug. Plug fires just fine out of the head.

111 · Jul 3, 2016

Get a new plug or plugs and put them in, I have had lots of plugs that will not fire under compression, buy autolite or ngk plugs, I never buy champions anymore, they are garbage. It seems like if you flood them you might as well throw away even if new. Or try switching plug and wire with another cylinder. It still should fire even with low compression and new plug. Then take it out and work it
Ben

york · Jul 3, 2016

I have already put in all new autolite 386. The cylinder has good compression 75 psi. I will switch plugs and plug wires. When I pull the plug it is saturated with so much oil I don't think it can fire.

oldproudvet · Jul 3, 2016

I'd keep putzing with it and changing that plug when needed. If it was used with the broken rocker, one valve wasn't opening. If it was the ex, you'd keep drawing in fuel and air and it couldn't get out, making a mess out of the combustion chamber. If you could make it "work", it just may clean up. lots of carbon, oil etc to clean out of there. A bit a patience may avoid pulling the engine down.

york · Jul 3, 2016

Thanks guys for the suggestions. I am going to work with it a little more with changing plugs and wires on Tuesday. Let me give you a complete discription of my troubleshooting. With the new plugs in I started the tractor it had a miss right away, I pulled #4 plug wire off and miss stayed the same. I had fire through the plug wireto ground, I pulled # 4 spark plug out and it was soaked with oil. I wiped it off put it on the plug wire held it to ground and it fired. Reinstalled the spark plug and miss continued, pulled plug wire again miss didn't change, pulled spark plug, soaked with oil again, not carbon or soot good clean oil.

york · Jul 4, 2016

Problem found, (111) you were correct moved new plug from #4 to #3 problem moved with it. Plug will fire when it is out of the head but won't fire under compression. (oldproudvet) you were correct also, once #4 started firing I had a lot of carbon and other things coming out of the exhaust. I ran the old tractor too long with a broken rocker arm. I plowed and disc my garden this spring, and blew leafs with a PTO blower with it missing not knowing that the problem was. Lesson learned. Thanks guys for the help.

#4 plug saturated with oil on VAC

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