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CUMMINS

CUMMINS 3906698 OEM WATER PUMP RECTANGULAR RING SEAL – 5.9L/6.7L (1989–2018)

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SKU:
CUM3906698
MPN:
3906698
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  • CUMMINS 3906698 OEM WATER PUMP RECTANGULAR RING SEAL – 5.9L/6.7L (1989–2018)
  • CUMMINS 3906698 OEM WATER PUMP RECTANGULAR RING SEAL – 5.9L/6.7L (1989–2018)
  • CUMMINS 3906698 OEM WATER PUMP RECTANGULAR RING SEAL – 5.9L/6.7L (1989–2018)
$7.27

Description

Cummins 3906698 — Genuine Water Pump Rectangular Ring Seal for 5.9L & 6.7L

MPN: 3906698  |  Also Known As: rectangular ring seal, water pump seal  |  Type: Pump-to-block sealing ring

Genuine Cummins rectangular ring seal that seals the water pump to the engine block on B-Series applications. Designed for 5.9L (1989–2007) and 6.7L (2007.5–2018) Ram applications; always confirm by VIN/ESN. Replace this seal whenever the water pump is removed to ensure a leak-free service. Sold individually (1 required per pump).

Features & Benefits

  • OE sealing geometry for a perfect pump-to-block interface.
  • Coolant/heat resistant elastomer formulated for long life.
  • Direct-fit replacement that installs with factory-style pumps (OE or quality aftermarket).
  • Prevents leaks & pressure loss that can lead to overheating.
  • Backed by Cummins quality and material specs.

Verified Fitment (Automotive)

Year RangeEngineChassis
1989–1993 5.9L 12V (6BT) Ram 2500/3500
1994–1998 5.9L 12V (6BT) Ram 2500/3500
1998.5–2002 5.9L 24V ISB (VP44) Ram 2500/3500
2003–2007 5.9L ISB (Common-Rail) Ram 2500/3500
2007.5–2018 6.7L ISB (Common-Rail) Ram 2500/3500

Industrial/Off-Highway: Used primarily across BS3 5.9L B-Series and related ISB/QSB platforms. Verify by ESN before ordering.

Compatibility Notes:

  • This seal installs between the water pump and engine block. Replace it anytime the pump is serviced or removed.
  • Designed for OE-style pumps; ensure any aftermarket pump follows OEM dimensions.

Specifications

  • Part Type: Rectangular ring seal (water pump to block)
  • OE Part Number: 3906698
  • Cross-References (ID only): Interstate McBee M-3906698; “Seal ring / rectangular” listings
  • Quantity Required: 1 per water pump

Often Paired With

  • Water Pump Assembly: Cummins 5473238 (popular 5.9/6.7 pump kit)
  • Coolant & thermostat: Replace as needed when servicing the cooling system

What’s In The Box

  • (1) Genuine Cummins Rectangular Ring Seal (3906698)

Installation Tips

  • Clean mating surfaces thoroughly; inspect pump housing and block pocket for nicks or corrosion.
  • Lightly lubricate the seal; do not use RTV unless specified by service manual.
  • Torque water pump fasteners to factory specification and pressure-test the cooling system after fill.

FAQ

WILL THIS FIT MY 1989–2018 RAM 5.9L/6.7L?

Yes—this rectangular ring seal is used on 5.9L (’89–’07) and 6.7L (’07.5–’18) Ram applications; always confirm by VIN/ESN.

WHERE DOES THIS SEAL GO?

Between the water pump and the engine block to create a leak-free joint.

DO I NEED A NEW SEAL EVERY TIME?

Yes. Replace the seal anytime the water pump is removed or replaced.

IS THIS THE SAME AS AN O-RING?

No—this is a rectangular ring seal specifically sized for the Cummins B-Series water pump interface.

WILL IT WORK WITH AFTERMARKET PUMPS?

Yes, provided the pump matches OEM geometry; most quality aftermarket pumps do.

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Additional Information

Vehicle Year:
1989,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016,2017,2018
Vehicle Make:
DODGE
ENGINE:
5.9L
Part Type:
WATER PUMP SEAL
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