CUMMINS 4089742 OEM VACUUM PUMP RESEAL KIT – 5.9L CUMMINS (1994–2002)

Product Description

If you’re driving a 1994-2002 Ram with the 5.9L Cummins engine and you’re seeing oil seeping from the vacuum pump area, the OEM Cummins 4089742 reseal kit is exactly what you need. This kit is **manufactured by Cummins** to deliver the same build quality and fit as the factory-installed part.

With this genuine kit you’ll get the reliable seal do-over you need, helping stop that stubborn pump-to-power-steering joint leak or shaft seep. You’ll restore engine bay cleanliness and protect your vacuum / power signalling systems from contamination and wear.

Fitment is engineered to the factory spec and designed for smooth installation. Since this is a *re-seal kit* (not a full vacuum pump replacement), you retain the original pump housing and bearings — cost effective and efficient.

Fitment Details

• Fits 1994-1998 5.9L 12-valve (P7100) and 1998.5-2002 5.9L 24-valve (VP44) Ram 2500/3500 pickups. 
• Designed specifically for the Cummins/WABCO style vacuum pump assembly used on 5.9L B-Series engines. 
• One kit per vehicle. 

Why Choose This OEM Kit?

• Direct-fit replacement — no modifications required. 
• Stops the common leak at the vacuum pump shaft and the interface with the power steering pump. 
• Includes shaft seal, O-rings and interface gasket in one package. 

Cross Reference / Alternatives

While this is the genuine Cummins kit, you may also want to consider other related service parts in the vacuum pump area if you’re already servicing the unit:

• CUMMINS 3914868 OEM VACUUM PUMP BLOCK-OFF / COVER PLATE – 5.9L CUMMINS (1994-2002)
• CUMMINS 3934396 OEM VACUUM PUMP OIL SUPPLY LINE (Pump to Engine) – Ram 5.9L (1998.5-2002)
• CUMMINS 3923084 OEM VACUUM PUMP OIL SUPPLY LINE – 5.9L 12V Ram (1994-1998)

FAQ

Will this kit fit my 1994-2002 5.9L Cummins Ram?
Yes — this OEM kit is designed specifically for 1994-2002 Ram 2500/3500 with the 5.9L engine (both 12-valve and 24-valve versions). Confirm your ESN or pump tag if early 1991.5-1993. 

 Does it also work for 1991.5-1993 intercooled trucks?
Some sources list the kit for 1991.5-1993 trucks, but because of running changes you should verify your ESN or pump tag before ordering. 

 What’s included in the kit?
The kit typically contains one shaft seal, two O-rings and one vacuum-pump to power-steering pump interface gasket. 

 What are the signs I need this kit?
If you notice oil dripping where the vacuum pump mounts (especially at the junction with the power steering pump) or oil seeping from the pump shaft, you likely need this reseal kit.

Is this a genuine Cummins part?
Yes — this is the OEM Cummins part number 4089742.