That may be. I looked a little closer and didn't see anything older than 91.5. I did see they're now carrying pumps and kits for the Jacobs engine brake vacuum pumps.

 

Here are some pics and Part numbers:

Gasket x 1....Have to find this 1
Vacuum pump pod O-rings x 2 These come with the remans... 3910260
larger O-ring between Power steering and vac pump... 3912822
O-ring below pod adapter...391282200
The arrow shows where O-ring below adapter goes.

Here is the price info from Rock auto

A-1 CARDONE Part # 641300 More Info {Reman.}
Category: Vacuum Pump

Part Image
$126.99 core $20.00 $146.99

 

This just keeps getting better. It looks like the individual pump heads are the same part as the vacuum pump head on the Jacobs pump. ($169 at fixinrams) You might just have hit on a bonanza for the towing crowd! Maybe368, I put a link to your pics in the towing section for the Jacobs crowd.

 

That's coool, It just goes to show that even a blind squirrel finds an acorn every once in a while...Mark

 

Vacuum pods are interchangeable across the board, same four-bolt pattern, regardless of with or without that little hose-thingie = some have it--others don't--makes no difference in function.

Belt-driven such as found on Ford diesels, some GMs, and ALL vacuum-brake kits for vacuum-over-hydraulic trailer-brakes are identical and will swap with the engine-driven ones found on our Cummins and elsewhere.

I find them wherever price is cheapest, regardless of what application the box may say.

 

For what it's worth, according to my science education, a "perfect vacuum" is 29-INCHES HG (mercury).


My two dash-mounted vacuum gauges, one for truck, one for trailer, hold a steady 24-inHG and 26-inHG respectively AT IDLE.

These readings are from both the single engine-driven pod that supplies the truck (I had to lose the bottom one to clear the huge Ford cross-member) and the belt-driven one that supplies the trailer; both have many many thousands of miles on them.

A dash mounted vacuum gauge is a very useful tool for monitoring vacuum system health and trouble-shooting.

 

I am a little confused; are we getting the whole nine yards, power-steering pump and all; or, the entire vacuum-pump unit itself minus the PS-pump; or, are we just getting the two replacement pods ??

Thanks.

 

I agree 1oo% that monitoring the vacuum on these trucks is as important as monitoring egt's and such. After all, going is 1 thing and stopping is another, and I think more important thing Mark

 

I see, my mistake. It is because all my years as a paramedic measuring blood pressures in mm of hg, I just assumed vacuum was measured in mm's also. See what happens when one assumes ...Mark

 

No, just the pods, although I did replace the pump, hoses and all o-rings and seals and the gasket. Also. the pods from rock auto come with the o-rings for them, except the one that goes under the adapter plate. I have to say that it cured ALL of my leaks Mark