Product Description
Interstate-McBee M-3802160 Piston Kit — STD, Marine Bowl — 1989–1998 5.9L Cummins 12-Valve (Aftermarket Replacement)
Quality aftermarket piston kit engineered to OE form, fit, and function for the 5.9L Cummins 12-valve (6BT). This version uses the marine-style combustion bowl and STD (standard) bore size. Sold individually (per cylinder).
- Direct replacement: Matches OE geometry and materials for dependable service life.
- Marine bowl design: Bowl profile as specified for marine-style applications and builds.
- Standard bore: For blocks at standard 102.0 mm (4.016") when within spec.
- Complete kit: Includes piston, rings, wrist pin, and pin retainers for one cylinder.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3802160 |
| Bore Size | STD (Standard) — 102.0 mm / 4.016" |
| Crown Type | Marine bowl |
| Configuration | Piston kit for one cylinder |
| Sold As | Each (1 piston kit) |
| Qty Required (Engine) | 6 kits (one per cylinder) |
| Engine | 5.9L Cummins 12-valve (6BT) |
| Model Years | 1989–1998 (12-valve applications) |
What’s Included (per cylinder)
- (1) Piston — Marine bowl
- (1) Ring set — STD (file-to-fit as required)
- (1) Wrist pin
- (2) Pin retainers/clips
Vehicle/Engine Fitment
Always verify by engine serial number (ESN) and current bore size before ordering.
- Cummins 6BT 5.9L 12-valve (commonly 1989–1998 Dodge Ram 2500/3500)
- Other B-Series applications calling for P/N M-3802160 and STD bore
- Does not fit: 24-valve (1998.5–2002) without confirming part supersession/compatibility
Recommended/Related Parts
- Head gasket and upper/lower gasket sets
- Main and rod bearing sets
- Oil pump and timing components (inspect while apart)
- Ring compressor tool and plastigage (installation aids)
Install Notes
- Measure cylinders; hone or machine as needed. Use STD pistons only if bores clean up within spec.
- Check and set ring end gaps to the manufacturer’s specification; verify ring orientation.
- Confirm piston orientation (bowl/markings) and connecting-rod offset before installation.
- Torque fasteners and set clearances per the Cummins service manual.
- Pre-lube pins and rings; clean bores thoroughly after machining.
FAQ
Is this sold as a set of six?
No. This listing is for one piston kit (one cylinder). Order six for a full engine set.
How do I know if I need oversize?
Measure bore taper/out-of-round. If it won’t clean up at 102.0 mm, you’ll need an oversize piston and matching rings.
Will a marine bowl piston work in a truck application?
Many builds use marine bowl pistons, but combustion characteristics differ. Confirm with your tuner/engine builder for your injectors and intended use.
