I bought this one for you, Honey

[rockfarmer]

During my recent Cub buying spree I picked up a demonstrator for my wife. Well, that's my story and I am sticking to it!

It worked, kinda. She doesn't share in my affliction so even though she accepted my offering, we ended up parking El Blanco for three years.

After using my other two Cubs to prepare our 1/4 acre garden this year, it became painfully obvious they both need some TLC.

So, I decided to pull 'ol Blanco out of her 3 year hibernation and determine her overall health. 6 volt generator with cutout, 4 position light switch and magneto. Brand new aftermarket $45 carb.

Removed the hood, attached a pony tank, primed the oil pump, and pulled the starter. To my surprise, she fired up after the second try, with half choke. Allowed the engine to warm up and drove it around for 30-45 minutes. Smoked pretty bad for first 15 minutes and then subsided to this,
https://youtu.be/wFC5KgTdTbU

Only tractor I own that keeps high oil pressure when hot.

Turned off engine shortly after the video and pulled the plugs. 4,3,2,1 in the photo.

#3 was oil fouled and the others have significant soot on them. The plugs are Autolite 386. I purchased some 3116's to replace them.

I poured 5-6 ml of seafoam into each cylinder making sure the valve and cylinder heads got a good soaking. Allowed to sit for 24 hours now.

Question 1: Should I use the old plugs when firing back up to rid the seafoam, and soot hopefully, or go ahead and use the new 3116's.

[Clemsonfor]

I'd put in the old plugs. But in reality it probably doesn't matter, that would just be one more set of plugs to pull. You can probably take a wire brush or sand paper to those and carb cleaner and get those plugs as good as new.

[Stevetractor]

Let that seafoam sit in there for as long as possible, up to a month. Add more every time you walk by and carefully rock engine back and forth slightly. You may be surprised at how much carbon will be dissolved around rings allowing them to seal better. Then check the oil, and if not too over filled from the seafoam, fire her up on the old plugs and go for a good rip and get engine hot. Change oil, run a bit more and do a compression check and see where you are. Is this a replacement for a motor job? No, but it may prolong this engines life and make it useable. Good luck

[Stanton]

I would re-use the old plugs after cleaning them off (wire wheel) so you have a good, clean starting point on all plugs for future evaluation.

Glad to hear it started for you after sitting for 3 years.

[Frozenstate]

Those plug wires look like carbon core also. If they are, get copper core ones and it will run better..

[rockfarmer]

Took your great advice and let the cylinders soak in Seafoam for almost three weeks. Adding some every day and rocking back and forth using the fan. Pulled the valve cover and adjusted the valves, didn't need much as most were 0.016 ". Also poured Seafoam on top each lifter every other day and again turned the engine over using the fan. Pulled the air breather tube off and sure enough it was clogged. Cleaned it out and re-installed. Drained the oil today, which was very thin due to the addition of Seafoam, and jet black in color. Also, pulled the exhaust manifold and drained 1-2 ounces of dirty Seafoam. Added fresh Rotella 15-40 and installed a set of Champion D-19's I had on hand along with confirmed copper core plug wires.

Put fresh gas in pony tank and fired her up. Did NOT install a muffler. Smoked for 2-3 minutes then cleared up and no smoke! Drove around for 20 minutes with excellent oil pressure and engine sounding great with no smoking at all. Success!!! until I put the muffler back on. Immediately started smoking again. Figured it was due to oil/Seafoam residue in the muffler, but it continued smoking until the pony tank ran out of gas 15 minutes later.

I had previously installed a rain cap on the muffler purchased at TSC, which is larger and heavier than my other rain caps. If I hold the cap open with a stick, the smoking is almost undetectable. Let the rain cap drop and smoking gets pretty bad. With this small amount of back pressure introduced by adding a muffler and rain cap, what is causing the engine to smoke?

[rockfarmer]

Pulled the plugs and ran a dry compression test this morning. Results are 100, 100, 40, 100. #3 was oil fouled again. Plugs are D21's and not D19's btw.

I am guessing the ring(s) are still stuck on # 3 or could it be a valve is booger ed up?

Looks like the head and oil pan will be coming off today.

[Slim140]

Before you pull the head I’d run it some more to see if the ring will unstick, if that’s what it is. As long as it isn’t knocking or ticking it shouldn’t hurt it. It could also be a cracked ring on #3 or a valve not seating all the way.

[Eugene]

Before you pull the head I’d run it some more to see if the ring will unstick, if that’s what it is. As long as it isn’t knocking or ticking it shouldn’t hurt it. It could also be a cracked ring on #3 or a valve not seating all the way.

My guess, stuck compression rings. Seafoam and run engine for a few hours.

Then do the dry and wet compression test on the #3 cylinder. If compression improves, more Seafoam.