Re: 1992 - 1993 D250/ W250 replacement vibration damper
Current Cummins part number = 3916436 ($200 at local Cummins house)

looking on line, i find Cummins P/N 3958258 listed for several IH Case tractor applications, with one site listing "Replaces Cummins Mfg nos 3916436, 3958258, 3914454, 3911422, 3907190"

on visual comparison, they are identical, only the Case damper does NOT have the 2x indents as does the Cummins 3916436

Has anyone successfully used Cummins P/N 3958258? i only ask because this P/N is 1/4 to 1/3 the price of 3916436 from typical of Geno's or the Cummins parts house

edit: i suspect the answer is no, the lower cost damper will not work. i am guessing the 2x indents located on P/N 3916436 are how the speed sensor keeps count, thus allowing tach to work.
Definitive answer before i install this thing would be very much appreciated

thanks in advance for your response
Bill

 

From my understanding you need the notches in the damper so the CPS can get it's signal. Having said that if you have a 89-91.5 motor with no CPS then it would work fine.

 

nope, it was slated for later '92 with CPS.
My wife's gonna be thrilled - going to tell her i gotta now go buy a non-IC truck to match my new in box damper....

 

That dampener will actually only be found on the '89-'91.0 motors,

The 91.5 is the beginning on the intercooled motors, CPS, and over drive autos transmissions.

 

Thrashing and Oliver: I'm curious - based on the posted pic, would you have run the old dampener? my local Cummins house shop guys looked it over and said, "Mmmmm man we think you oughta replace it".
Rubber is pretty checked, not bulging too bad, alignment marks are still lined up

thank you
Bill

 

Bill,
I would run the OEM dampener.
I see nothing in the pictures that makes me think it is needing to be replaced.

 

Hey Ollie,

You need to zoom in. The rubber liner is cracked. It should be replaced before it separates.

I ordered one from Geno's. Was cheaper than local. It made the truck idle a tad smoother. Worth replacing, IMO.

 

Those cracks don't worry me. Sure maybe something to keep an eye on when changing the oil out and make sure it doesn't change. I bet it doesn't. I would hop in my truck, if it had a balancer like that, and drive across the country.
I have never seen one separate without bulging out and getting squishy, most likely due too oil or fuel soaking.

 

Well sir... I guess you would know more than I.

I'm just not a fan of broken rubbers.


Tires, harmonic balancers, or prophylactics. None of it's good for me.

 

Could it be replaced as a preventive move? Sure.
I just got the feeling the guy was trying to not spend the money unless he really needed to sort of feel, from the wording of his question. I would say that is not in the kind of shape where I think it will lead to any problems in the near future. I would say it would be safe to run and keep an eye on it.

If he does decide to change it out I recommend the right later style harmonic balancer. He could even use a '94-'98.0 12V or '98.5-'02 24V balancer as well.

I have put a few of the later year balancers on my 1st gens as they get a bigger and better balancer in the later years. Kinda like a cheaper, easier to install version of the "Fluidamper" SP? aftermarket ones.

 

Same here, the 1998.5-2002 model is the largest and cheapest for some reason.
cummins pn 3918999

 

Oliver - Do the larger 2nd gen dampeners have same pulley size? i.e. would not require belt change when installed in 1st gen?
thanks
Bill

 

Bill - The pulley size is the same.
You will need to loose up the CPS [crank position sensor] bolts and back it out on the adjustment tabs for the larger diameter dampener.
It is a bolt in affair other than that small adjustment.

I run that 24V dampener on my '85 crew cab and ''89 RC with a 1st Gen 12V motor swapped in.

 

As you have noted, the notches are for the tach signal, but if it is that much cheaper than the right one, a local machine shop ( or a buddy who works there ) should be able to put the cuts in cheaply.......... Just make sure he uses a cutter with a generous radius.