Product Description
Interstate-McBee M-3902343 Cylinder Head Alignment Dowel — 1989–2018 5.9L / 6.7L Cummins
OE-style cylinder head alignment dowel for Cummins B-Series engines. Centers and locates the cylinder head to the block during installation to ensure proper gasket alignment and clamp load. Sold individually.
- Accurate head location: Helps prevent gasket misalignment and sealing issues.
- OE-equivalent dimensions: Built to match Cummins reference 3902343 for a precise fit.
- Durable construction: Hardened steel dowel for repeatable installs and service work.
- Service friendly: Ideal when replacing heads, blocks, or when original dowels are damaged or missing.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3902343 |
| OEM Reference | Cummins 3902343 |
| Material | Hardened steel |
| Sold As | Each (1 alignment dowel) |
| Typical Quantity | Commonly two (2) per engine — verify for your ESN/application |
| Position | Cylinder head to block locating dowel |
What’s Included
- (1) Cylinder head alignment dowel, P/N M-3902343
Vehicle Fitment
Always confirm by engine serial number (ESN).
- Cummins B-Series applications specifying 3902343, including:
- 5.9L Cummins (12-Valve & 24-Valve): 1989–2007
- 6.7L Cummins: 2007.5–2018
Install Notes
- Inspect block and head dowel bores for damage or debris before install.
- Seat dowels fully; do not crush or deform. Replace any bent or marred dowels.
- Carefully lower the head squarely over the dowels to avoid nicking the gasket.
- Follow the Cummins service manual for head bolt torque/angle procedures.
FAQ
How many dowels does my engine use?
Most B-Series applications use two dowels to locate the head, but counts can vary. Verify the required quantity for your specific ESN.
Do I need new dowels when replacing the head gasket?
If your original dowels are damaged, missing, or loose in the bore, replace them. Proper location is critical for gasket sealing.
Is this compatible with aftermarket heads or blocks?
Yes, if the aftermarket component is machined to OE spec for the 3902343 dowel. Always check the manufacturer’s spec sheet.
Why Buy From CPP Diesel
- ESN-verified fitment help from diesel specialists
- Fast shipping and hassle-free returns
- Large inventory of complementary head/gasket hardware
