I have been planning to switch my 1983 Universal M25 to a serpentine belt. Have a Delco SI12 modified to work with Balmar
MaxCharge MC614 and a 150A stator. I have experimented with the settings of the voltage regulator
(including the belt saver setting of 4) and I am happy with the performance, except that while cruising I had to replace 3/8"belt too often.To advance this project
, I searched for info and came across this dated thread.
Now I haven't done the math and may be way off on this, but my guess is that the individual combustion strokes, as the forward most connecting rod slams down on the journal of the crank shaft every other revolution when motoring or maybe even in fast idle, would impose loads on the front crankshaft bearing that should be comparable to (if not larger than) the loads imposed by the alternator
belt. I always figured alternators were traditionally mounted up on the left side (right side facing the pulley) so the belt load subtracts from the operational front bearing loads. Anyone cares to comment?
I have considered adding a ball bearing in front of the crakshaft pulley (M25 has a convenient splined stud poking out there) and preloading it somehow ( spring or short V-belt?) to balance the tension of the alternator
belt. Just an (dumb?) idea.
Now the main thing: the commertially available kits are way too expensive for me, slightly cheaper solution were the few machine shops that advertise to make the necessary pulleys from a drawing. The latter, maybe both use aluminum
stock, which I don't have enough experience with. Would it wear faster than steel
? Any idea about using an automotive pulley that could be modified to fit over the existing V-belt one?
Anyone has done the conversion to the serpentine belt on a small diesel
and cares to share details?