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Low Boy sputters under load
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- 5+ Years
- Posts: 6
- Joined: Mon May 16, 2016 11:38 am
- Zip Code: 44878
Low Boy sputters under load
Hello, I have one of the yellow and white low boys...63-67 I believe. She starts right up and purrs like a kitten at any rpm. But as soon as there is any load on the motor, it sputters and loses power, also seems to run hotter now. I've rebuilt the distributor, new plugs and wires, and cleaned the main jet. I'm assuming that it is starving for fuel under load, but I'm concerned I might be chasing the wrong problem. Should I be looking at the valve train, timing...etc. Any help would be greatly appreciated.
- gitractorman
- 10+ Years
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Simplicity Conquest
Simplicity Legacy 4x4 Diesel
Mitsubishi MT180D 4x4 Diesel - Circle of Safety: Y
- Location: Grand Island, NY
Re: Low Boy sputters under load
Sounds to me like the timing is off, and/or the governor is not working properly. Also, with the early Lo-boys like this, the moderators should move this to the standard Cub forum. You'll get more eyes looking at it that way, and they're the same tractor up till 1968/69 when the number series starts.
Cub Cadets 682, 1811, 1864, Simplicity Legacy XL 4x4 Diesel with FEL, 60" mower, 50" Tiller
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- 5+ Years
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- Joined: Thu Nov 05, 2015 10:07 am
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Re: Low Boy sputters under load
May be running lean. Check carb. adjustment, intake manifold gaskets, carb to intake gasket, cracked intake, adjust timing by ear (not with the light), make sure points are opening and closing all the way, weak coil?, water in the gas?
There is a finite number of things to check until you find the problem, just keep at it, you'll find it.
There is a finite number of things to check until you find the problem, just keep at it, you'll find it.
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- 5+ Years
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- Joined: Mon May 16, 2016 11:38 am
- Zip Code: 44878
Re: Low Boy sputters under load
Well I completely tore down the carb and cleaned it. Then I adjusted the timing, which was quite a bit out. But when I put it where it should be, it didn't run good at all. How exactly do I adjust it by ear? Just advance it until it sounds like it's smooth? The distributor was good and tight, so I'm not sure how it got that far out....but even with it close to TDC on low idle, (where it sounded good) it still sputtered only under load. The advance is working properly as well. Any timing tricks I could try?
Thanks.
Thanks.
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- 5+ Years
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- Joined: Mon May 16, 2016 11:38 am
- Zip Code: 44878
Re: Low Boy sputters under load
I also just ordered a new coil. Hopefully that will help?
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Re: Low Boy sputters under load
Distributor timed to engine.dano6807 wrote:I adjusted the timing, which was quite a bit out. But when I put it where it should be, it didn't run good at all.
Used the 2nd pulley mark to line up with the pointer to time the ignition? 1st pulley mark to match the pointer is the distributor advance mark.
Roll engine over until pointer lines up with the 2nd mark to line up with the pointer. Mark the distributor base to line up with the center of the #1 spark plug tower on the distributor cap. If the rotor isn't close to the mark on the distributor base, roll the engine over 1 complete turn until the TDC mark and pointer line up. The center of the rotor should be pointing directly at your mark on the distributor base.
Edit: Frankly I don't know what you are doing wrong in timing your engine. Something is wrong. You should not have to time it by ear. There are You-tube videos on how to time the Cub engine.
I have an excuse. CRS.
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- 5+ Years
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- Zip Code: 44878
Re: Low Boy sputters under load
Exactly.....I used the first mark at low idle, then ran throttle all the way up and it advanced to the 2nd mark. I have no clue how that couldn't be right, but it didn't like being there (rough idle and slight backfiring). So I advanced it slightly, and it sounded great. That just doesn't seem right, unless the cam is out of time, but even then I think I would have bigger problems. Plus it ran perfect last summer, so again it makes no sense to me.
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Re: Low Boy sputters under load
Ignition timing problem. I'm sure I mentioned that a couple of times. Did you run the checks I posted?dano6807 wrote:I have no clue how that couldn't be right, but it didn't like being there (rough idle and slight backfiring). So I advanced it slightly, and it sounded great.
Did you check to see that the distributor wires are on the correct spark plug?
Yup. No comment.That just doesn't seem right, unless the cam is out of time, but even then I think I would have bigger problems. Plus it ran perfect last summer, so again it makes no sense to me.
I have an excuse. CRS.
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- 5+ Years
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Re: Low Boy sputters under load
Yes, I performed all of those checks after I used the timing light and saw how far out it was. Plug wires are correct, points are new, gap is correct. Like I said, she starts and runs perfect....just not under load. I'm going to run through the timing process again, and try the new coil. Hopefully the problem will arise.
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Re: Low Boy sputters under load
Check the crank pulley with the timing marks on it. There is a keyway that sometimes gets wallowed out and allows some slop. This may have your timing marks off a bit.
You can see it best with the timing light. If the keyway is sloppy, the timing marks seems to jump around a bit.
You can see it best with the timing light. If the keyway is sloppy, the timing marks seems to jump around a bit.
184 w/ Creeper & 3-Point
IH 3160a Mower
IH Model 15 Tiller
IH-54 Blade
IH 3160a Mower
IH Model 15 Tiller
IH-54 Blade
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- 5+ Years
- Posts: 6
- Joined: Mon May 16, 2016 11:38 am
- Zip Code: 44878
Re: Low Boy sputters under load
I will definitely check that out. That makes sense because I have gained some power back by messing with the timing, but the marks still don't line up with the pointer.
Thank you everyone for your help!
Thank you everyone for your help!
- gitractorman
- 10+ Years
- Posts: 2678
- Joined: Mon Oct 24, 2005 11:35 am
- Zip Code: 14072
- eBay ID: toysforjake
- Tractors Owned: Lots of Cub Cadets!
1951 Farmall Cub
1977 IH Cub
1966 IH Cub
1965 IH Lo Boy
1964 IH Lo Boy
1949 Farmall Cub
Several IH 154 Lo Boys
1979 IH 184 Lo Boy
Simplicity 4416 Sovereign
Simplicity Conquest
Simplicity Legacy 4x4 Diesel
Mitsubishi MT180D 4x4 Diesel - Circle of Safety: Y
- Location: Grand Island, NY
Re: Low Boy sputters under load
Since you're messing with the timing, I'd double check that the crank shaft pulley is still attached properly. It is VERY common for the key way to wear allowing the pulley to spin on the crankshaft. In many cases it turns just a little then becomes wedged in place but now your timing marks are not correct. It's a pain to fix but it could be a big problem if your tractor has lost power and you're trying to get it back in time, and the marks aren't in the right locations.
Cub Cadets 682, 1811, 1864, Simplicity Legacy XL 4x4 Diesel with FEL, 60" mower, 50" Tiller
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Case "S" 1941 - Location: Springfield, Ohio
Re: Low Boy sputters under load
Could you also be trying to time by a different cylinder? Is your timing light pickup on the right plug wire?
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