39 Allis B

grandpa Love · Nov 13, 2019

Hand crank. Been doing some reading this morning and one thing I keep seeing is " make sure impulse is working correctly" how do you know? Also " charge the cylinder"? I usually pull handle 2 clicks then a fast pull and it starts. But........ Sometimes it just won't start! What makes the difference? I understand that sometimes when it's been running and it's hot it's gonna be hard to start. I'm more concerned with first start of the day when it gets cranky! Any input or ideas? Thanks

old · Nov 13, 2019

You should hear the impulse trip as your coming up on and past TDC. You should hear a sort of loud click and that is the impulse tripping

Steve@Advance · Nov 13, 2019

The "impulse" is the clacking sound the magneto makes.

There is a spring and a release mechanism that winds up and releases to spin the mag fast enough to spark at cranking speed to make a spark. Once it starts the impulse is bypassed mechanically as it is not needed. If you hear the clacking, it is working.

Charging the cylinder means turning it through a couple times with the choke on to pull some fuel up, then giving it the hard crank, hoping for a start.

Crazy Horse · Nov 13, 2019

I was told once that after starting an Allis B, make sure you have oil pressure. Well, I guess that would be the case for anything but especially the Allis B's (and maybe other ones as well). Apprently the pump is driven off the camshaft (or something like that, not sure) and sometimes it does not activate the pump. After startup you'll hear some clanking and banging noises which tells you to shut it down and start again. Maybe somebody can clarify this a bit, especially if you post it over on the Allis forum.

tractorsam · Nov 13, 2019

What I usually do to handcrank almost anything is set the ignition to ?off? and then crank twice (two half turns) with full choke. Then set choke to half and turn the ignition on. Usually the next crank will start it if it?s in decent shape. As demonstrated to me by an old farmer one time and it?s treated me well. Sam

Matt Thomas · Nov 13, 2019

The reason for the oil pressure warning is that these can lose "prime" and not deliver oil through the system. Most often happens on high hour tractors that have been sitting a long time. If I have not been able to start mine up for a while, I have to pull the line from the oil filter and pour a bit down the line. That always does it and good pressure returns.

9001ron · Nov 13, 2019

Allis b has a goofy oil system -- yes it has a oil pump and a pressurized system BUT !!!! The camshaft is hollow and is drilled with holes to line up with each cylinder. When the oil pressure comes up and fills the camshaft it sprayers out like a sprinkler system when watering your lawn oiling every thing . So it is just an elaborate splash oil system.
On an allis b always keep the oil level on full on the dipstick even slightly over. Like I said it is essentially a splash system so it isnt going to do any harm to have it splash some more. Keeping it full also makes it easier for the oil pump to prime . If I am going to be doing some heavy work with the finishing mower I also mix some oil with the gas.

9001ron · Nov 13, 2019

I will also add that my B if you stall it hot it will NEVER start again till it has compleatly cooled off. That is the hand cranked model. You just have to take a brake and do some thing else for awhile.

47fivewindow · Nov 13, 2019

When I was young we had a couple of tractors without starters. We just hooked another tractor up and pull started them. Parked on the top of a hill at lunch time. Be careful, broken arms heal slowly.

grandpa Love · Nov 13, 2019

Hmmmm.... Ignition off? Mine has a wire running out of the mag back to the steering wheel. It has a bare end that I touch to metal to ground it and kill it.

rustyfarmall · Nov 14, 2019

(quoted from post at 09:28:59 11/13/19) I was told once that after starting an Allis B, make sure you have oil pressure. Well, I guess that would be the case for anything but especially the Allis B's (and maybe other ones as well). Apprently the pump is driven off the camshaft (or something like that, not sure) and sometimes it does not activate the pump. After startup you'll hear some clanking and banging noises which tells you to shut it down and start again. Maybe somebody can clarify this a bit, especially if you post it over on the Allis forum.

Pretty much every engine I have been into drives the oil pump from the camshaft.

Aaron SEIA · Nov 14, 2019

An Allis B drives direct off the back of the cam. The pump is a good 6" above the oil with a pickup tube going down. I guess some can lose prime and not pump from time to time.
AaronSEIA

39 Allis B

grandpa Love

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old

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Steve@Advance

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Crazy Horse

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tractorsam

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Matt Thomas

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9001ron

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9001ron

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47fivewindow

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grandpa Love

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rustyfarmall

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Aaron SEIA

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