Vacuum Pump for 2006.

[MFranz]

Tried to buy the Vacuum Pump from Cummins for a 2006 Dodge 1 ton and there telling me it's a Dealer Item. Can anyone tell me where they have purchased one recently?Do you need to replace both the Vacuum Pump and Pump Diaphragm?I see Genos has both parts but was wondering whom else would sell this. This pump is made by Jacobs and it's for the exhaust brake.
Looking for info on the installation. Any special tools needed?I here the belt can be difficult to install. I have also heard that that same belt can be used without the Vacuum Pump. Anyone have experience with this?

Thanks,Mike

 

[CKelley1]

genos is the best and cheapest place to get one. the pump is a pos the best thing to do is to replace the jacob with a bd, the bd does not use a vacuum pump and the jacob is old technology. the bd works a lot better and is easy to install. as our vacuum pumps fail we keep a bd in stock and just replace. you are luckey only the diaphragm failed. i was outside pecos texas on a friday night in july when a pump failed and burned the surpentine belt up before i could get shut down. it was not a very pleasant 4 day vacation

 

[mwilson]

Mike,



I think that these Cummins Dealers are going brain dead, can they not look up their own products anymore???



Here is a link to the Jacobs parts manual with Cummins part numbers...



http://www.jacobsvehiclesystems.com/files/support/docs-pdfs/32416 Rev E.pdf



Print that out and lug it back into the dealer, ask them why they could not find it.



The belt is different than the stock belt, carry a spare stock belt with you so in the event of a pump failure you can put the stock one back on and keep on motoring.



Mike W.

 

[Bill Stockard]

That same vacuum pump was used on the Navistar/Ford 6. 9L and 7. 3L IDI engines beginning in '83. The belt pulley is the only difference. At one time the pump at a Navistar/International truck dealer was around $125-150 which was about half what Ford charged for it. Our dealership parts department sold truck load of them to Ford pickup owners.



Bill

 

[CKelley1]

mwilson i am glad you mentioned the belt. on the remaining 3 trucks we have with the jacobs that is what we do. wish i thought of that before the pecos trip

 

[HBarlow]

There is nothing at all wrong with the Jacobs Exhaust brake used on ISB5. 9 engiens. Two of them gave me hundreds of thousands of miles of great service on my two previous Rams.

The vacuum pump used on the '06 Jacobs pump was a weak point but I only had to buy one replacement at 60k miles. The second one was running fine at 170k miles (on the vacuum pump) when I sold the truck.

 

[MFranz]

Thanks for the replys all. Spare belt sounds like a good idea. Has anyone changed a pump out and can offer advise on how to?I here the belt can be a challenge. Harvey are you saying that the pumps in the 2006 were not built as good as the current replacements?Would I have to replace both the pump and the diaphragm?I believe that mine might be the pump that's making all the noise. Sounds like a bearing going bad. Thanks again everyone.



Take Care

Mike

 

[HBarlow]

Thanks for the replys all. Spare belt sounds like a good idea. Has anyone changed a pump out and can offer advise on how to?I here the belt can be a challenge. Harvey are you saying that the pumps in the 2006 were not built as good as the current replacements?Would I have to replace both the pump and the diaphragm?I believe that mine might be the pump that's making all the noise. Sounds like a bearing going bad. Thanks again everyone.

Take Care
Mike

Mike,

I can't actually make that claim because I have no evidence to support it but my experience was that the first one provided a short service life, the replacement was fine. I have known or read posts by others with a similar experience.

I bought the vacuum pump at a Cummins dealer and handed it over to my long time personal Dodge mechanic who put it on and charged me a few bucks. I don't remember any need to replace a diaphram.

As long as you can buy one from your local Cummins dealer or Geno's I would keep using the Jacobs and consider an occasional failed part no big deal.

 

[mwilson]

Thanks for the replys all. Spare belt sounds like a good idea. Has anyone changed a pump out and can offer advise on how to?I here the belt can be a challenge. Harvey are you saying that the pumps in the 2006 were not built as good as the current replacements?Would I have to replace both the pump and the diaphragm?I believe that mine might be the pump that's making all the noise. Sounds like a bearing going bad. Thanks again everyone.



Take Care

Mike

Changing the pump will not be a bad job, all bolts are right there. The belt is a little intimidating at first but really is not bad. I remove the air cleaner box, that gives a little more room for my arm.



Do some of the threading from underneath, then the left side and finally finish with the tensioner on the right.



A lot of us are leaning towards a vacuum leak in the system as the root cause for many failures of pumps.



You should use a mighty-vac or something similar and draw a vacuum on the system while you have the line unhooked changing the pump. Be sure to test for leaks with system at rest and then with engine brake applied to make sure it is all tight.



Current Cummins pricing on the 3965925 Vacuum Pump is around $220. 00. I think that the price has dropped since last year.



I feel if it is noisy then the whole assembly should be changed. I wouldn't trust it otherwise.



Mike.

 

[MFranz]

Thanks everyone,Mike I found the pump at Genos for $169. But they also show a pump diaphragm for $359. Where is the diaphragm located at on the motor. From the catalog it looks like it sits on top of the Vacuum pump. I have called Genos and haven't got thru yet. Any thoughts.



Thanks,Mike

 

[mwilson]

Thanks everyone,Mike I found the pump at Genos for $169. But they also show a pump diaphragm for $359. Where is the diaphragm located at on the motor. From the catalog it looks like it sits on top of the Vacuum pump. I have called Genos and haven't got thru yet. Any thoughts.



Thanks,Mike

They have the prices reversed in the printed catalog.



See this link for the on-line picture and pricing of the complete pump with diaphragm. Same thing as the Cummins one mentioned above.



. . GOULD REPLACEMENT VACUUM PUMP - JAKE BRAKE ('03-'07, 5. 9L)-Dodge Cummins Diesel Truck Accessories – Geno’s Garage



This for the diaphragm which is the top portion of the pump only.

GOULD REPLACEMENT VACUUM PUMP DIAPHRAGM - JAKE BRAKE-Dodge Cummins Diesel Truck Accessories – Geno’s Garage



Mike.

 

[MFranz]

Thanks Mike,I was just looking at that online. Cummins dealer was telling me I also should be able to pick this pump up at most auto parts stores. Cummins dealer has it for $215 plus $15. Shipping. I'm going to go by and make sure it's the right one. I'm concerned about the pulley size and pattern.



Thanks,Mike

 

[mwilson]

Thanks Mike,I was just looking at that online. Cummins dealer was telling me I also should be able to pick this pump up at most auto parts stores. Cummins dealer has it for $215 plus $15. Shipping. I'm going to go by and make sure it's the right one. I'm concerned about the pulley size and pattern.



Thanks,Mike

The Cummins 3965925 pump should be identical to what you have now.



Mike.

 

[MFranz]

Mike,ordered the 3965925 Vacuum Pump. Pick it up tomorrow. Thanks for all the help. It's going to cost me $249. 88 out the door. I was quoted $1000 at our local Dodge Dealer. Thanks again to all for the support.

Take Care
Mike

 

[mfrost]

Good point in carrying a stock belt. I have a Banks engine brake and it sure looks like a Jacobs vacuum pump they installed on it. Got it installed in Jan. 2011. Does anyone know it is a Jacobs or something else?

 

[CKelley1]

up untill last year it was the same as the junk jacobs but i understand banks found a way around bd and pac patients and the new one is supose to work as good as the pac and bd but i have never seen the new one but if it still uses the vacuum pump i still would not have one. harvey and i do not disagree on many things but jacobs and automatics are two that we do.

 

[HBarlow]

up untill last year it was the same as the junk jacobs but i understand banks found a way around bd and pac patients and the new one is supose to work as good as the pac and bd but i have never seen the new one but if it still uses the vacuum pump i still would not have one. harvey and i do not disagree on many things but jacobs and automatics are two that we do.

No hard feelings if we disagree once in awhile.

Hell, some members disagree with every post I write. Their problem, not mine.

 

[PFlory]

I lost my first vacuum pump with only 30k miles on it . Luckily the original belt (which I kept in the truck) can be reinstalled without interference on the vacuum pump.



The replacement pump (Geno's Garage) went on easily, with no difficult or hard to reach bolts. When removing the pump I found the dealer that installed it just slipped the vacuum hose on the pump barb without any clamp. After reading on here how vacuum leaks can cause pump failure, I installed a worm gear clamp on that fitting.



I had a banks brake in my former 01 which seemed to have a little more stopping power, but that said the Jake still works well and I can descend any grade I've come across here on the East coast with the 5'er without use of the service brakes.