Texasmark1
Well-known Member
Never had a bad one and had tractors back to the Farmall Super A, MF TO-20. New 1988 3910 acquisition has the 192 cu. in. (I think) diesel engine, and besides being a very noisy engine, vibrates way more than my 2000 and 3000.
Suspect the Balancer has dried out and isn't balancing. Hard to see down in there without tearing things out, radiator, fluid hoses and such....... and if I go that far I will have a new one handy. Besides fan and alternator, the belt attached drives a PS pump, no biggie on the load thing. Fan belt is a ?" wide HD however.
Any of you guys have problems with HBs on these engines? My first possible experience in 40 years.
One thing that may have caused it to fail prematurely, if that's the case, is the fact that the tractor has an accelerator pedal just to the right of the right foot platform that is easily hit with the right foot, meaning over it's 30 years of life (900 proven, actual engine hours however).
The engine accelerates like a hot rod......may be due to it being the "over square" 4.4 x 4.2 bore-stroke design, like under square hot rod gassers. That could have placed undue stress on that pulley that normal under square, slow accelerating normal high torque diesels don't apply and is why I suspect it to be the cause of the vibration. The other thing is that the vibration changes over the rpm range as would happen with resonances in the engine which the damper is designed to dampen.
On the noise, it's just loud. It apparently is built in UK and has the 10" oval, horizontal muffler (new) and non-view obstructing, down the side exhaust system. Checked the exhaust, manifold and gasket fine, exhaust pipe is without defects, new muffler, blows a stream 4-5 foot behind at 1000 rpm I know that these engines won't run with back pressure, idles down to 300 on a test, nice and smooth, checked valve condition with a piece of paper at the muffler outlet...passed that, little valve noise but I like to hear them tick...don't see a problem there. Starts just about as fast as you can get your fingers off the key even after sitting overnight.
Thoughts appreciated.
Thanks,
Mark
Suspect the Balancer has dried out and isn't balancing. Hard to see down in there without tearing things out, radiator, fluid hoses and such....... and if I go that far I will have a new one handy. Besides fan and alternator, the belt attached drives a PS pump, no biggie on the load thing. Fan belt is a ?" wide HD however.
Any of you guys have problems with HBs on these engines? My first possible experience in 40 years.
One thing that may have caused it to fail prematurely, if that's the case, is the fact that the tractor has an accelerator pedal just to the right of the right foot platform that is easily hit with the right foot, meaning over it's 30 years of life (900 proven, actual engine hours however).
The engine accelerates like a hot rod......may be due to it being the "over square" 4.4 x 4.2 bore-stroke design, like under square hot rod gassers. That could have placed undue stress on that pulley that normal under square, slow accelerating normal high torque diesels don't apply and is why I suspect it to be the cause of the vibration. The other thing is that the vibration changes over the rpm range as would happen with resonances in the engine which the damper is designed to dampen.
On the noise, it's just loud. It apparently is built in UK and has the 10" oval, horizontal muffler (new) and non-view obstructing, down the side exhaust system. Checked the exhaust, manifold and gasket fine, exhaust pipe is without defects, new muffler, blows a stream 4-5 foot behind at 1000 rpm I know that these engines won't run with back pressure, idles down to 300 on a test, nice and smooth, checked valve condition with a piece of paper at the muffler outlet...passed that, little valve noise but I like to hear them tick...don't see a problem there. Starts just about as fast as you can get your fingers off the key even after sitting overnight.
Thoughts appreciated.
Thanks,
Mark