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Go Back   Only Cub Cadets > Cub Cadets > Cub Cadet Engines > Onan Engines
Reload this Page Not a Cub Onan, but a MF 1855 B48M
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  #1  
Old 03-28-2020, 10:29 PM
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EarlJ EarlJ is offline
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Default Not a Cub Onan, but a MF 1855 B48M
Ok guys, hopefully someone here can help. I've asked in the onan forum on fb but no resolve. This engine is on my snapper/massey ferguson 1855. The engine is a b48m that I freshened up. New rings and gaskets, valve job, surfaced the heads. I'm linking the video on facebook so that you guys can hear what it's doing. Now since making the vid, I've reset the float, installed new intake gaskets, sprayed from here to doomsday for vac leaks none found.
Additionally, I swapped the plug wires around on the coil but no change. I checked the valves while running and they are moving freely and in spec. That weird part is the drivers side exhaust is way colder than the passenger side, in fact I can grab the drivers side no problem, the pass literally blistered my hand in an instance.

https://m.facebook.com/groups/831304...93702804052438
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126 in surgery with weights, spring assist, 3 point and sleeve hitch
100 with woods finish mower and rear lift,
Nice 125 with super nice sweepster, 1782 Super Diesel,
1650,782D in surgery, 102 parts tractor..
3 Brinley plows, Brinley cultivators , rear scrape blade, front plows and custom built bedder attachment.
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  #2  
Old 03-29-2020, 10:27 AM
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cooperino cooperino is offline
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Quote:
Originally Posted by EarlJ View Post
Ok guys, hopefully someone here can help. I've asked in the onan forum on fb but no resolve. This engine is on my snapper/massey ferguson 1855. The engine is a b48m that I freshened up. New rings and gaskets, valve job, surfaced the heads. I'm linking the video on facebook so that you guys can hear what it's doing. Now since making the vid, I've reset the float, installed new intake gaskets, sprayed from here to doomsday for vac leaks none found.
Additionally, I swapped the plug wires around on the coil but no change. I checked the valves while running and they are moving freely and in spec. That weird part is the drivers side exhaust is way colder than the passenger side, in fact I can grab the drivers side no problem, the pass literally blistered my hand in an instance.

https://m.facebook.com/groups/831304...93702804052438
How much compression on dead cylinder?
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  #3  
Old 03-29-2020, 08:58 PM
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EarlJ EarlJ is offline
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It's not dead per-se just cooler. Its firing, the cylinder is just cooler. I haven't done a compression check yet, can't locate my gauge...
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126 in surgery with weights, spring assist, 3 point and sleeve hitch
100 with woods finish mower and rear lift,
Nice 125 with super nice sweepster, 1782 Super Diesel,
1650,782D in surgery, 102 parts tractor..
3 Brinley plows, Brinley cultivators , rear scrape blade, front plows and custom built bedder attachment.
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  #4  
Old 03-29-2020, 09:21 PM
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It's not dead per-se just cooler. Its firing, the cylinder is just cooler. I haven't done a compression check yet, can't locate my gauge...
Ok.. a temp check then?? Maybe the Hot cylinder is the issue? Need more info. Blister VS cool is kinda vague.
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Old 03-29-2020, 09:33 PM
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green407 green407 is offline
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It's not dead per-se just cooler. Its firing, the cylinder is just cooler. I haven't done a compression check yet, can't locate my gauge...
If you can hold onto it while the engine is running, it's dead. Maybe a bad plug, got one of the compression rings upside down, damaged head gasket, didn't stagger the rings? Could be anything.
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Old 03-29-2020, 09:33 PM
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ol'George ol'George is offline
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You should sizzle steak on the exhaust manifold on both sides.
Clearly the cool side is not producing power.
what color is the plug? fouled,wet? ????
something is not right on the cool side.
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Old 03-30-2020, 08:12 AM
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cooperino cooperino is offline
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It's not dead per-se just cooler. Its firing, the cylinder is just cooler.
How do you know its firing? In your video "hard to tell" but it looked like it was missing pretty badly. From what I saw I would say it is not firing. These engine will run on one cylinder. Sometimes will even have enough power to move around pretty well. If you engage the blades at full throttle does it stall the engine? If so theres a real good chance the cylinder is dead as I suspected..

As a side note. George is 100% correct. Both sides should burn your hand on contact. I think you threw me off a little by saying cooler. The temp difference should really be no more than 20 degrees. When you said cooler I assumed it to be just slightly outside that parameter.
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Old 03-30-2020, 05:47 PM
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EarlJ EarlJ is offline
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I've pulled the plug and checked for spark, it was beautiful. Now it seems to that the plug is fuel fowling, its wet. Installed a new plug ran a few mins did the same thing. Now I'm of the thought, I'm flooding and that being the long side of the manifold would be the reason it's fowling out. I think maybe I should order a brass float or swap this carb out.
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126 in surgery with weights, spring assist, 3 point and sleeve hitch
100 with woods finish mower and rear lift,
Nice 125 with super nice sweepster, 1782 Super Diesel,
1650,782D in surgery, 102 parts tractor..
3 Brinley plows, Brinley cultivators , rear scrape blade, front plows and custom built bedder attachment.
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Old 03-31-2020, 09:02 AM
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I've pulled the plug and checked for spark, it was beautiful. Now it seems to that the plug is fuel fowling, its wet. Installed a new plug ran a few mins did the same thing. Now I'm of the thought, I'm flooding and that being the long side of the manifold would be the reason it's fowling out. I think maybe I should order a brass float or swap this carb out.
OK..Well, that I guess could happen, However, a wet plug can happen from other things. Typically if your flooding an engine like this it effects both cylinders. I would do a compression test before ordering parts.
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Old 04-01-2020, 01:37 AM
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I've done compression check wet cylinder has 90psi and the other has 85psi. I'm thinking to order one of the nikki carbs from ebay. Pretty sure my carb is just wore out.
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126 in surgery with weights, spring assist, 3 point and sleeve hitch
100 with woods finish mower and rear lift,
Nice 125 with super nice sweepster, 1782 Super Diesel,
1650,782D in surgery, 102 parts tractor..
3 Brinley plows, Brinley cultivators , rear scrape blade, front plows and custom built bedder attachment.
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