Cummins Adapter O-ring 3631471 for QSK60 KTA19 KTA38 KTA50

Part Number: 3631471
English Name: ADAPTER, O-RING / O-RING JOINT PLUG
Chinese Name: O-Ring Flange Joint, Rocker Cover Sealing Joint, Oil Passage Plug Adapter
Material: Precision machined cast steel, with built-in O-ring installation seat, resistant to engine oil, high temperature, and high pressure
Appearance: Dual-ear flange mounting structure, central cylindrical sealing boss, fixed with two bolts

All-series Cummins K-series high-horsepower units:
KTA38, QSK38, KTA50, QSK50

Applicable Scenarios: High-power generator sets, mining equipment, marine main engines, and oilfield power units

Assembly Location: Oil passage interface on the side of the cylinder head rocker arm chamber, serving as an oil passage plug/transition joint.

Core Function: Seals the lubrication oil passage and, in conjunction with the built-in O-ring, prevents oil leakage; in some models, it serves as a reserved plug for sensors or pipelines.

Failure Symptoms: O-ring aging and wear on the joint surface can lead to oil seepage in the rocker arm chamber and increased oil consumption.

When disassembling the rocker arm chamber, overhauling the cylinder head, or inspecting for leaks, it is recommended to simultaneously replace the matching O-rings; the connector body can be reused if it shows no deformation, but all sealing components must be replaced with new ones.

Ordering Note: These parts are exclusive to K38/K50 models and are not compatible with K19, QSK60, M11, or ISX15 engines.