What This Gasket Seals
The 855 lube oil cooler lives in a housing on the side of the block, with a cover plate bolted over it. This composite fiber gasket sits between that cover plate and the housing face. Full pressurized lube oil runs behind it at operating temperature, so the joint sees heat, pressure pulses and constant thermal cycling every duty cycle.
When it lets go, you get oil down the side of the block, usually tracking back along the housing and pooling on the frame rail or the bellhousing area. It reads like a rear main or a cooler core leak from the ground, which is why plenty of shops pull the core before they check the cover joint.
Failure is normally the gasket taking a compression set after years of heat, or a cover plate that was pulled down uneven on reassembly. Once the fiber crushes and relaxes, torque bleeds off the fasteners and the joint starts to seep. It rarely blows out — it just weeps and gets worse.
Why 3069014 And 3801199 Match
3801199 is the Cummins interchange number for the same oil cooler cover gasket. On the 855 platform, numbers get superseded and reissued across Big Cam production and service kit changes, so the same physical gasket ends up listed under more than one number depending on which manual or kit sheet you're reading.
What actually defines the part is the cover plate footprint: the bolt hole pattern, the port openings and the sealing face width all have to match the oil cooler housing on the block. That geometry did not change across the 855 variants this gasket serves, so both numbers point at one gasket.
These numbers are listed for identification only. PartStop is not affiliated with, endorsed by, or authorized by Cummins or any other OEM. Treat the cross-reference as a starting point — confirm against the number stamped or tagged on your old part, or against your engine serial number.
Check Before You Order
Get the engine serial number off the dataplate first. The 855 family covers a long production run and multiple cooler housing configurations, so a chassis-year lookup on a Kenworth W900, T800 or Volvo VNL is not enough on its own. Serial number is what settles it.
Pull the old gasket and lay it flat. Count bolt holes, check the port cutouts and measure the outer envelope against what you're ordering. If the housing face is pitted or the cover plate is warped from over-torqued fasteners, dress it or replace it — a new gasket will not bridge a damaged sealing surface.
3069014 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 3069014. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Cummins | 3801199 |
Frequently asked questions
Is 3801199 the same gasket as 3069014?
Yes, 3801199 is the Cummins cross-reference for this oil cooler cover gasket. Both numbers describe the same sealing part for the 855-series cover plate joint. We list the number for identification only. Confirm against the number on your old gasket or your engine serial before ordering.
I have oil running down the side of the block on my NT855. Is it this gasket?
It's a common source and worth checking before you tear into anything bigger. Clean the area, run the engine and watch where the oil originates. If it starts at the cover plate seam on the oil cooler housing, this gasket is the likely cause. If it's coming from the core itself, the cooler needs attention instead.
Do I need to replace anything else while I'm in there?
Inspect the cover plate for warp and the housing face for pitting or old gasket material. Any hardware that has been over-torqued or is corroded should be replaced rather than reused. If the cooler core is out, it's a good time to pressure test it while access is open.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
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Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.