Harmonic balancer? Loosing power but engine sounds good.. help

Those units have a dry clutch and it may be that your clutch needs adjusted. is the engine loading down? or will the tractor just not push? if the engine isn't lugging down but the tractor won't push check the clutch adjustment. it should "snap" in, there is a spec of how many pounds force is needed to get the clutch to "snap" over centre, don't have it in front of me.

If the engine is lugging down and seems to be underpowered, i would check the fuel pressure first, if it is smoking black smoke then check the air filter. Can't see how the vibration dampener would affect power, it will cause vibration.

the tractor will not push. I believe the clutch does needs adjusting but I didn't think that played any part in it. ok will do. and I believe fuel pressure is good and so is air filter. it has to be the clutch then. thanks a bunch!

Not trying to argue, but.....

My service manual for d6 4r,5r shows one available for the d4600 in the front, and my parts book shows one fitted to the engine as well, 6b6669 is the part number.

i thought, "there is no way that old engine has a harmonic balancer" but i checked my books and thy were originally fitted with one.

Check your clutch, most likely the culprit.

Thank you gentleman, TCTractor and CCjersey,

I did not realize there was a difference between a vibration dampener and a harmonic balancer, you are quite correct, i checked my parts book again and it is called a dampener assembly, not a harmonic balancer.

i also checked my d318 book, and my 9u/8u parts books and they are only fitted with a pulley on the nose of the crank.

Harmonic balancers and vibration balancers are one of the same. They are similar to a flywheel in that they protect the crankshaft from twisting and breaking. When engines became more powerful, they were used. Like when an old D 8 was made into a "H P", High Horsepower unit.

The engine balancer used on 4 cylinder engines, like later D 315 and D 339 is a device to keep the engine from bouncing (vibrating) up and down. This is commom on any 4 cylinder engine or a V8 that is any degree less than a 45o, example D336. On a 3408, which is less than a 45o engine, they fooled the engine to think it is a 90o by off setting the crank journal at each adjoing rod bearing. Buick had already done that on a V6 engine. Now, with that said!! Go to bed and sleep tight! Bill Walter

Hi Team,
from a Service Magazine dated May 15 1967. The article is on this very subject.
It is a bit in-depth to start with but goes on thru the differences--the Harmonic Vibration Damper is discussed later in the article.
Hope this helps.
Cheers,
Eddie B.

PS looks like we are back to the BB posting out of order again.
The pix are numbered for ID sequence :- 1 thru 3--sorry.