Allis WD only running on 1 cylinder?

Clifford · #1 02/28/07, 12:38 PM

Is this possible? I pulled all 4 plugs and only #2 was hot. Cylinders 1, 3 and 4 were luke warm. It has been really running poorly since yesterday when I flooded it during start up. Oil has lots of gas in it.

It has been running fine until yesterday. Plugs are fouled black and flip top on exhaust stack is black now. I'm going out to get some new plugs and oil to change.

Is it running too rich, or is this just a result of the cylinders not firing after flooding?

Hammer4 · #2 02/28/07, 02:05 PM

I would suggest a compression test while you have them out if you can borrow a tester. That much gas in the oil sort of implies oil leaking down past the rings into the crankcase, not a good thing, low compression will point towards that as well......it could just be the plugs got really fouled, fresh oil and fresh plugs and she might be good as new.

Yeti · #3 02/28/07, 05:11 PM

you washed out the rings. shoot some oil in the cylinders and crank over. then re install the plugs after you have changed the oil. too much fuel in the oil will continue to wash out the cylinders. you may have a bad float check valve if its repeating this on start up.

Clifford · #4 02/28/07, 05:19 PM

Quote:

Originally Posted by Yeti

you washed out the rings. shoot some oil in the cylinders and crank over. then re install the plugs after you have changed the oil. too much fuel in the oil will continue to wash out the cylinders. you may have a bad float check valve if its repeating this on start up.

Oil pressure was very low, so I would imagine this is true.

I changed the oil, put in new plugs and it runs like a champ now and the oil pressure is high once again.

Thank goodness. There is a large snow storm coming tomorrow and I needed to skid logs before the snowfall. Thanks.

moopups · #5 02/28/07, 05:36 PM

Why did it flood is the question here. Does it do it repeatably? That section of the problem needs to be remedied before it will remain satisfactory.

One common source of flooding is the float bowl atmospheric vent being clogged, a common thing around older machines.

Is it a gravity feed carb? Does fuel squirt out of the air intake? When the air filter is removed, so that you can see?

I have seen this problem baffle long time 'experts'. There is a need for the air in the float bowl chamber to escape as the fuel enters. Gravity systems cause air compression in the chamber. The fuel is pushed down and then up through the jets to exit the into the air intake.

The opening is much less in size that a pencil lead, it has to be cleared for the thing to work right.

Yeti · #6 02/28/07, 06:28 PM

Glad you got it running right, sometimes the easy fixes elude us. I ussally see this problem when the fuel pump diaphrams leak into the oil pan. you never see it coming till its to late.

ericjeeper · #7 02/28/07, 09:01 PM

and updraft carb.,

Clifford · #8 03/01/07, 12:45 PM

Quote:

Originally Posted by moopups

Why did it flood is the question here. Does it do it repeatably? That section of the problem needs to be remedied before it will remain satisfactory.

It was running way too rich. Backed out the mixture needle two complete turns and it's doing much better. These old machines have to be fine tuned, but run forever...