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INTERSTATE MCBEE

INTERSTATE-MCBEE M-3904409 EXHAUST VALVE GUIDE 51.75MM 89–98 5.9L CUMMINS (AFTERMARKET REPLACEMENT)

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SKU:
MCBM-3904409
MPN:
M-3904409
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  • INTERSTATE-MCBEE M-3904409 EXHAUST VALVE GUIDE 51.75MM 89–98 5.9L CUMMINS (AFTERMARKET REPLACEMENT)
  • INTERSTATE-MCBEE M-3904409 EXHAUST VALVE GUIDE 51.75MM 89–98 5.9L CUMMINS (AFTERMARKET REPLACEMENT)
$13.54
724-785-4022

Description

Interstate-McBee M-3904409 Exhaust Valve Guide – 51.75mm for 89–98 5.9L Cummins (B-Series)

Premium thick-wall exhaust valve guide engineered to OEM dimensions for Cummins B-Series 4B/6B engines, including 1989–1998 Dodge Ram 2500/3500 5.9L Cummins 12-valve (6BT). Interstate-McBee delivers OEM-style fit and long service life at an aftermarket price.

  • Direct OEM cross: Replaces Cummins 3904409 for B-Series applications.
  • Correct length: 51.75 mm exhaust guide for 12-valve heads (see intake note below).
  • Durable thick-wall design: Maintains valve stem alignment and reduces guide wear.
  • Aftermarket value: Interstate-McBee quality at significant savings vs. OEM boxed parts.

Specifications

Brand / Part Interstate-McBee M-3904409
OEM Reference Cummins 3904409
Application Exhaust valve guide, B-Series (4B/6B), 5.9L 6BT 12-valve
Length 51.75 mm (≈ 2.04 in)
Typical Dimensions Approx. 0.316 in I.D. (semi-finished), 0.554 in O.D.
Material Thick-wall steel/iron valve-guide alloy
Cross-References PAI 192040 / 192040-048 / 192040E; Cummins 4090327
Package Contents (1) Exhaust valve guide

Vehicle Fitment

Always verify by engine serial number (ESN) for exact compatibility.

  • Dodge Ram 2500/3500 5.9L Cummins 12-Valve (6BT)
    • Model Years: 1989–1998 (pre-ISB/24V)
    • Quantity guidance: 6 exhaust guides per engine (one per exhaust valve)
  • Industrial / Agricultural: Cummins 4B/4BT and 6B/6BT variants where 3904409 is specified.

Install Notes

  • Press guides using proper drivers; heat cylinder head and chill guides as needed for correct interference fit.
  • Semi-finished I.D.: Ream/hone to final valve-stem clearance after installation per Cummins specs.
  • Verify installed height/protrusion and chamfer orientation; lubricate during valve installation.

Important Intake vs. Exhaust Note

Intake guides on many 6BT applications use a longer 60.50 mm guide (e.g., Cummins 3904408). This M-3904409 is the 51.75 mm exhaust guide. Order the correct length for each valve position.

Why Buy From CPP Diesel

  • Expert ESN-verified fitment support for B-Series engines
  • Fast shipping, easy returns, and knowledgeable techs
  • One-stop source for valves, seats, springs, seals, and full head kits

FAQ

Will this fit my 1998.5–2002 24-valve (ISB) 5.9L?
No. This guide targets 12-valve 6BT (1989–1998) applications. Later 24-valve ISB heads use different guides.
Is 51.75 mm the intake or the exhaust guide?
51.75 mm is commonly the exhaust guide length. Many intake positions use a longer 60.50 mm guide (e.g., Cummins 3904408). Check your head casting and ESN.
Do I need machining after pressing the guide?
Yes. These guides are typically supplied with a semi-finished I.D. and must be reamed/honed to the valve-stem clearance after installation per the Cummins service manual.
How many exhaust guides are needed for a full 6BT head?
A 12-valve 6BT has 6 exhaust valves, so 6 exhaust guides complete the set (order intake guides separately if needed).
What other parts should I replace during a head refresh?
Consider valves, valve stem seals, seats/inserts, springs, and keepers/locks. Inspect rocker bridges and pushrods.
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