Ken Christopherson
Well-known Member
Ok everyone.. After getting out to see the tractor that I posted earlier about (originally thought it was a WD45, but it is in fact a WD).. Here are the things I went over:
- Adjusted the valves to .014"
- Checked inside the tank: Clean
- Checked fuel flow from tank to bowl, bowl through line, and then cracked the drain on the carb. All is good
- Adjusted idle mixture screw to 1 1/2 turns out. Set load screw to approximately 1 1/2 turns out (it was nearly 4 turns out)
- Checked the plugs (running Autolite 295).. All but #4 were pretty fouled. Cleaned them all as best I could (he didn't have new plugs). Set them to .030"
- Checked the points over. Some cloudy/discoloration on them. Polished them up, set them at .020"
- Noticed that the valve cover gasket was leaking considerably near the front
- Compression test conducted - wide open throttle, no choke. All cylinders had approximately 90-95 PSI.
- Started tractor up. Warmed up. Seemed to run fairly well. Adjusted Load needle to approximately 1 3/4 turns out. Idle was at about the same. Adjusted idle speed up some (was set too low)
- Shut tractor down to fuel up (let set for about 10 minutes). Started back up, tractor seems to 'hunt' throughout midrange rpm's. Also has a decent amount of popping/backfiring through carburetor. Tried to make more carb adjustments without much success. Pulled choke out to about 1/2-3/4 choke and seemed to alleviate symptoms slightly.
- Also, checked connections near manifold and carburetor with both propane and carburetor cleaner to test for leaks. No change in RPM.
- I also noticed, the exhaust port of the cylinder head at #1 cylinder seems to glow whenever there is a pop/backfire. Almost as though the casting is extremely thin at this point.
It is a 12 volt system, distributor with 6 volt coil and ballast resistor & alternator. Also, he replaced the ignition switch with a key switch. (Not sure if this has any bearing on the problems). To shut the tractor off, you must turn off the fuel. You can turn key switch off, battery disconnected and it will still run.
I have enclosed a video of the tractor running. It seems the governor/carb hunting only happens mid-range on RPM's. I get some popping back through nearly the entire throttle range. I have removed the carburetor to do a complete overhaul on it (Marvel Schebler TSX159).. Also will be replacing the valve cover gasket. At this point (other than new spark plugs), I am unsure what to check. Could the governor assembly be worn/need adjustment?
Like I say, I am new to Allis, so any help is appreciated! (Video should be ready about 6:30 PM Central Time
Allis WD Troubleshooting
- Adjusted the valves to .014"
- Checked inside the tank: Clean
- Checked fuel flow from tank to bowl, bowl through line, and then cracked the drain on the carb. All is good
- Adjusted idle mixture screw to 1 1/2 turns out. Set load screw to approximately 1 1/2 turns out (it was nearly 4 turns out)
- Checked the plugs (running Autolite 295).. All but #4 were pretty fouled. Cleaned them all as best I could (he didn't have new plugs). Set them to .030"
- Checked the points over. Some cloudy/discoloration on them. Polished them up, set them at .020"
- Noticed that the valve cover gasket was leaking considerably near the front
- Compression test conducted - wide open throttle, no choke. All cylinders had approximately 90-95 PSI.
- Started tractor up. Warmed up. Seemed to run fairly well. Adjusted Load needle to approximately 1 3/4 turns out. Idle was at about the same. Adjusted idle speed up some (was set too low)
- Shut tractor down to fuel up (let set for about 10 minutes). Started back up, tractor seems to 'hunt' throughout midrange rpm's. Also has a decent amount of popping/backfiring through carburetor. Tried to make more carb adjustments without much success. Pulled choke out to about 1/2-3/4 choke and seemed to alleviate symptoms slightly.
- Also, checked connections near manifold and carburetor with both propane and carburetor cleaner to test for leaks. No change in RPM.
- I also noticed, the exhaust port of the cylinder head at #1 cylinder seems to glow whenever there is a pop/backfire. Almost as though the casting is extremely thin at this point.
It is a 12 volt system, distributor with 6 volt coil and ballast resistor & alternator. Also, he replaced the ignition switch with a key switch. (Not sure if this has any bearing on the problems). To shut the tractor off, you must turn off the fuel. You can turn key switch off, battery disconnected and it will still run.
I have enclosed a video of the tractor running. It seems the governor/carb hunting only happens mid-range on RPM's. I get some popping back through nearly the entire throttle range. I have removed the carburetor to do a complete overhaul on it (Marvel Schebler TSX159).. Also will be replacing the valve cover gasket. At this point (other than new spark plugs), I am unsure what to check. Could the governor assembly be worn/need adjustment?
Like I say, I am new to Allis, so any help is appreciated! (Video should be ready about 6:30 PM Central Time
Allis WD Troubleshooting