July 23, 2020
Greetings,
My name is Don, I am a tractorholic and I need advice! (That used to be funny. Not so much, lately.)
I bought my 1948 Ford 8N (8N94754) in 1986. My mechanical & licensed electrician good friend, Rick, completed a very major overhaul 385 hours ago in 2012. Since then additional upgrades as noted below:
Problem:
Tractor starts strong and runs perfectly until it does not. After 45 minutes or so of constant pasture mowing work-load the engine begins to stutter and within two minutes it is running very rough, sometimes back-firing. However, it will idle just fine. After allowing a cooling period she is ready to go back to work, but 45 minutes later the problem repeats. It behaves much like a car of mine years ago which had a vapor-lock issue.
Having followed this forum for years I know when a member describes rough-running issues the advice usually concerns fuel or spark. And this may still be the culprit but let me list our repair attempts:
Pertronix electronic ignition, new remote coil, NGK #B-6L plugs, no ballast resister.
New fuel line installed and insulated hoping to cure imagined vapor-lock.
Rebuilt carburetor
Fuel bowl & carb filters perfectly clean - passed 2-minute gas flow test.
Drilled .067 hole in gas cap to relieve imagined gas tank vacuum issue.
Note: The new fuel line runs close to the (hot) vertical exhaust preventing a safe inspection of the carb filter and fuel flow in the field.
I will not be surprised when the fix is obvious to the more experienced on the forum. All suggestions are invited and sincerely appreciated!
Don
Sherwood, Oregon
[email protected]
Greetings,
My name is Don, I am a tractorholic and I need advice! (That used to be funny. Not so much, lately.)
I bought my 1948 Ford 8N (8N94754) in 1986. My mechanical & licensed electrician good friend, Rick, completed a very major overhaul 385 hours ago in 2012. Since then additional upgrades as noted below:
Problem:
Tractor starts strong and runs perfectly until it does not. After 45 minutes or so of constant pasture mowing work-load the engine begins to stutter and within two minutes it is running very rough, sometimes back-firing. However, it will idle just fine. After allowing a cooling period she is ready to go back to work, but 45 minutes later the problem repeats. It behaves much like a car of mine years ago which had a vapor-lock issue.
Having followed this forum for years I know when a member describes rough-running issues the advice usually concerns fuel or spark. And this may still be the culprit but let me list our repair attempts:
Pertronix electronic ignition, new remote coil, NGK #B-6L plugs, no ballast resister.
New fuel line installed and insulated hoping to cure imagined vapor-lock.
Rebuilt carburetor
Fuel bowl & carb filters perfectly clean - passed 2-minute gas flow test.
Drilled .067 hole in gas cap to relieve imagined gas tank vacuum issue.
Note: The new fuel line runs close to the (hot) vertical exhaust preventing a safe inspection of the carb filter and fuel flow in the field.
I will not be surprised when the fix is obvious to the more experienced on the forum. All suggestions are invited and sincerely appreciated!
Don
Sherwood, Oregon
[email protected]