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Blue smoke on rebuilt H motor

A

Anonymous-0

Well-known Member
Took my H and little genius 2 bottom to a plow day on Sat. Tractor had been run several hours up and down hills with light load. Tractor ran great with no smoke while plowing, but developed a light blue haze at slow/fast idle with no load. What's going on here? Motor was totally rebuilt with new sleeves, pistons, valves, guides, valve springs, and bearings. I wouldn't think it should puff blue smoke like this. It does not appear to be burning any oil. Checked at end of plow day (about 6 hours of almost continuous running and oil came out of petcock.
 
How much clearance did you have on the pistons. I find Red Power sleeves to be too tight but have no idea what you used. In this day of different mixes of aluminum pistons it is difficult at best to know what you are getting as they expand at different rates.
 
Another thing to keep in mind is that these engines do not have valve seals (unless you added umbrella seals upon rebuild). Due to this it is not uncommon to get a puff of blue smoke every now and then. My h seems to do it occasionally upon idling down or even upon throttling up after it has been idling for an extended period. It does not do it all the time though.

Nothing to worry about really as long as not excessive and constant. In my case my h has not been rebuilt as far as I know so I am not too concerned with it.
 
Not too sure since I didn't do the rebuild, but I know they were aluminum stepped pistons and (I think) chrome rings. Would they be more difficult to seat?
 
Almost exactly what this is doing. Great oil pressure and no misfire. More of a nuisance than anything else.
 
I would agree on the valve seals also, but they normally really puff it out on start up and after idleing for a while then accelerating. Not a steady light blue at idle. But, these old H and M's do wear the rocker arms and shafts a lot so they can really pour oil on the valves. I put valve seals on two out of three of my own tractors and now wish I had done the other and the rockers were in good shape on all of them.
 
Chrome rings generally take longer to seat. Some old cures were slowly feeding a spoonful of Bon-Ami into the carb while the engine was idling--never tried it myself so don't know if it worked.
 
Chrome rings do take longer to seat. Some guys prefer to use cast iron rings on old tractors that won't be put to work long enough to set chrome rings. The Bon-Ami trick was discussed on YT not too long ago. You might find it in the archives.

I have an Oliver 88 that was completely rebuilt maybe 5 or 6 years ago and it will puff a little blue just once-in-awhile but I never need to add oil between changes. I didn't have it on a load for several years after I did the rebuild so I'm thinking the chrome rings didn't seat well. I'm a little hesitant to do the Bon-Ami trick but they claim it works. Jim
 
They need to be worked hard to seat the rings properly! Plowing is good, grinding feed is good, chopping silage, generator, dyno, etc are all excellent ways to get the tractor working hard after the initial warm up.

A pull type bush hog and 3' grass would be the best for the tractor to spread its wings a little.
 
(quoted from post at 19:37:27 05/05/13) Chrome rings generally take longer to seat. Some old cures were slowly feeding a spoonful of Bon-Ami into the carb while the engine was idling--never tried it myself so don't know if it worked.
Click to expand...

Google has tons of info on the Bon-Ami trick. I never knew...thanks!
 
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