Product Description
Interstate-McBee M-3755843 — T4 Turbo Inlet Gasket (1989–2024) 5.9L / 6.7L Cummins
Replacement turbocharger inlet gasket for standard T4 turbine housings. Designed to seal between the exhaust manifold (or T4 adapter) and the turbocharger on Cummins 5.9L and 6.7L applications equipped with a T4 flange. Sold individually.
- T4 fitment: Matches the common T4 turbine inlet footprint used on many stock-replacement and upgraded turbos.
- Reliable seal: Helps prevent exhaust leaks at the turbo inlet for proper spool and performance.
- Drop-in: Direct replacement when servicing or swapping a T4 turbo/manifold.
What’s Included
- (1) T4 turbo inlet gasket — P/N M-3755843
Vehicle / Application Fitment
Verify your flange type before ordering.
- 5.9L Cummins (1989–2007) using a T4 exhaust manifold or T3-to-T4 adapter.
- 6.7L Cummins (2007.5–2024) using a T4 exhaust manifold or T4-flanged turbo kit.
- Not interchangeable with T3 or T6 inlet gaskets.
Recommended / Related Parts
- Turbo mounting hardware kit (studs, nuts, washers)
- Exhaust manifold to cylinder head gaskets
- T4 exhaust manifold or T3-to-T4 adapter (if upgrading from T3)
- Downpipe and oil line gaskets/seals as needed for your turbo setup
Install Notes
- Clean both mating surfaces; remove all old gasket material and carbon.
- Dry-fit to confirm bolt pattern and alignment, then install without kinks or folds.
- Torque fasteners to the manifold/turbo manufacturer’s spec in a criss-cross pattern.
- After initial heat cycle, re-check fastener torque and inspect for exhaust leaks.
FAQ
Will this fit a stock 5.9L/6.7L Cummins?
It fits when your turbo/manifold uses a T4 turbine inlet. Many factory setups are T3; if you haven’t converted to T4 or added a T4 adapter, this gasket won’t fit.
Is this the divided (twin-scroll) style?
This gasket fits standard T4 turbine inlet patterns. For specialized divided housings that require a partitioned gasket, confirm your turbo’s requirement before ordering.
How many do I need?
One per turbocharger inlet connection.
Specifications for Interstate-McBee M-3755843
| Brand | Interstate-McBee |
| Part Number | M-3755843 |
| UPC | Not specified by manufacturer/seller |
| GTIN | Not specified by manufacturer/seller |
| Shipping Info | Package weight: approx. 0.04 lb. Approx. package dimensions: 6.00" (W) x 4.00" (D) x 1.00" (H). Standard small-parts packaging; ships via standard ground service unless otherwise selected at checkout. |
| Cross Reference | Cummins: 3755843 (turbocharger mounting / T4 inlet gasket). Interstate-McBee: M-3755843 (direct aftermarket replacement). Reliance: K3755843 (equivalent listing). Common usage: T4 turbocharger inlet gasket on various Cummins 5.9L / 6.7L and medium-duty applications using a T4 turbine inlet flange. |
| E-Codes | Not specified |
| Prop 65 | WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information: https://www.P65Warnings.ca.gov |
