Aussie Ken
Member
Working on a 1938 BO and a 1938 BN for a friend in Australia this past Saturday
Neither tractor has petcocks
Have rebuilt the carb and adjusted the WICO X mag on the BO - had trouble starting it until we found a throttle setting just above idle - marked in with a scribe line - now it starts 2nd spin of flywheel -sometimes, but the throttle setting is critical- I am getting a new throttle plate, the old one is worn at top and bottom from former bushing replacements that were not installed correctly - I install the bushing down into the carburetor bore, then use a half round file to remove material so the bushing fills the entire area-
The BN is another story
I adjusted the wico c mag to throw the spark at #1 impulse
Put gas in and it started after 15 pulls of the flywheel - ran terrible - no idle circuit
Dismantled the carb and it was full of rust and crud- don't know how it started
Replaced carb with one for a BR that was recently returned from the USA rebuilt
Checked fuel level in bowl -3/4 inch from top of bowl - 2nd spin it popped and then nothing for at least 40 spins- not even a pop - removed the plug - not wet after having full choke on for at least 20 spins -
Pulled rebuilt carb back off - will dismantle yo check everything
I have filed and set points in mag - seems like a decent spark
What are we doing wrong?
I seem to have trouble starting these early B's- had the same problem on one in Canada -
What are other guys methods to start these tractors without petcocks?
tried the BN again on Sunday-- unfortunately it appears it had a "CIL overhaul" - tried to start again today -switched mags since the Wico C spark was irratic - to a new X mag -timed perfectly - reinstalled the rebuilt in USA carb after inspecting and finding nothing wrong - good fuel flow - correct level of fuel in bowl - correct idle and load settings - second spin got one pop and that was it -adjusted the throttle setting to different positions -nothing -noticed that the flywheel was easier to get over TDC than the BO beside it -also without petcocks - THEN - while turning the flywheel down on my knees, I could hear a "swoosh" sound when turning it over - took the valve cover off, sounded like the compression was leaking out the intake, took off the crankcase cover, and a LOT of compression was moving past the rings!!! Next step will be a compression test and then head removal, and then hone and ring replacement. OH, and the clutch driver is loose on the crankshaft as well - the poor owner purchased the tractor along with others from a man in MI - looks like this one looked good, but mechanically bad!!
I found the compression PSI on a early B -according to the "MR Thinker's" Green Magazine Almanac to be 60 psi - correct?
Neither tractor has petcocks
Have rebuilt the carb and adjusted the WICO X mag on the BO - had trouble starting it until we found a throttle setting just above idle - marked in with a scribe line - now it starts 2nd spin of flywheel -sometimes, but the throttle setting is critical- I am getting a new throttle plate, the old one is worn at top and bottom from former bushing replacements that were not installed correctly - I install the bushing down into the carburetor bore, then use a half round file to remove material so the bushing fills the entire area-
The BN is another story
I adjusted the wico c mag to throw the spark at #1 impulse
Put gas in and it started after 15 pulls of the flywheel - ran terrible - no idle circuit
Dismantled the carb and it was full of rust and crud- don't know how it started
Replaced carb with one for a BR that was recently returned from the USA rebuilt
Checked fuel level in bowl -3/4 inch from top of bowl - 2nd spin it popped and then nothing for at least 40 spins- not even a pop - removed the plug - not wet after having full choke on for at least 20 spins -
Pulled rebuilt carb back off - will dismantle yo check everything
I have filed and set points in mag - seems like a decent spark
What are we doing wrong?
I seem to have trouble starting these early B's- had the same problem on one in Canada -
What are other guys methods to start these tractors without petcocks?
tried the BN again on Sunday-- unfortunately it appears it had a "CIL overhaul" - tried to start again today -switched mags since the Wico C spark was irratic - to a new X mag -timed perfectly - reinstalled the rebuilt in USA carb after inspecting and finding nothing wrong - good fuel flow - correct level of fuel in bowl - correct idle and load settings - second spin got one pop and that was it -adjusted the throttle setting to different positions -nothing -noticed that the flywheel was easier to get over TDC than the BO beside it -also without petcocks - THEN - while turning the flywheel down on my knees, I could hear a "swoosh" sound when turning it over - took the valve cover off, sounded like the compression was leaking out the intake, took off the crankcase cover, and a LOT of compression was moving past the rings!!! Next step will be a compression test and then head removal, and then hone and ring replacement. OH, and the clutch driver is loose on the crankshaft as well - the poor owner purchased the tractor along with others from a man in MI - looks like this one looked good, but mechanically bad!!
I found the compression PSI on a early B -according to the "MR Thinker's" Green Magazine Almanac to be 60 psi - correct?