well i think my vaccum pump is not putting out what i need it to, the brake pedal is hard and the exhaust brake only works when it wants to, plus the engine has been through 2 swaps already and the diaphram pots are alittle beat up.
so my question is, can i swap the diapragm style pump for a rotary style vaccum pump?
it would clean up that area and if i understand correctly they are more efficient.
has anyone done this?

oh yeah it is a 92 engine.

 

 

A '92 Cummins should have the vane type pump already.

Mark.

 

ok maybe it is earlier than 92, that was what i was told it was.
nobody has upgraded there vaccum pump i guess

 

I'll go on the assumption that yours is a non-intercooled engine, especiallly since you mentioned the dual pods.

Here's the parts you'll need to convert it CORRECTLY:
Vane Style Vaccum/power Steering Pump assembly (91.5-'97)
BLOCK SIDE Power steering/injection pump support bracket ('91.5-'93), this is the same bracket that supports the rear of the injection pump.
P.S PUMP SIDE support bracket, often missing or broken, this is WHY the o ring sometimes leaks in this version-no support, it looks more like a bent "tab" and is nut/studded to the pump.
Oil supply line and corresponding fittings on the block.
The oil supply orifice is plugged on non-intercooled engines and it's located directly behind the PS/VAC pump, towards the front.

In order for the newer pump assembly to clear the non-intercooled throttle bracket, you'll need to cut the lower end of the throttle bracket off.
It will not affect the functionality of the throttle assembly, but you do have to remove the bottom bolt and that part of the bracket for the PS/VAC pump to clear.

Mark.

 

ok that is what i needed to know, thanks Mark.
sounds like it might be a little more effort than it is worth.
anyone know where to get parts to fix my vaccum pump, i went to the local parts store and they don't have any listings at all.

 

LOL, you don't know what effort is until you've tried to rebuild one of those types of pump assemblies.
EVERYTHING is pressed together on them, they don't "just come apart".

You'd be better to buy a new one (super big $$$), go buy a used one from a yard that will warranty it, or convert to the new style.

Another option is to run an electric vacuum pump.

Mark.

 

I swapped the vacuum pump on my '90 Cummins with one from a '96 Cummins because of clearance issues in my 1984 Ford. It sounds worse than it is. Just follow Mark Nixon's directions, and you will be done in an hour or so. Nothing to it, and I know very little about the Cummins engines. Mine has great vacuum.