Overview – N GAS ENGINE CYLINDER HEAD 4914691-10
The Cummins N GAS ENGINE CYLINDER HEAD 4914691-10 is a direct replacement used in Cummins N-family natural gas engines (G855 and related gas builds), with no modification required at installation.
Parts Characteristics
A cast-iron cylinder head for the natural gas variant of the N-series engine, machined with gas-specific valve seats and guides, intake and exhaust ports, and a finished deck surface. The -10 revision reflects the updated machined configuration for the gas build.
Applicable Models & Applications
Fits Cummins N-family natural gas engines used in compressors, gensets and industrial drives. Verify the head casting number and the -10 revision against your engine serial number or old casting before ordering – N-series gas and diesel heads differ in seats, ports and compression arrangement and are not interchangeable.
Maintenance & Replacement
Track head health through oil consumption, coolant behaviour and compression readings. Persistent coolant loss without an external leak, bubbles in the expansion tank, or a cylinder with low compression all point at head-gasket or head integrity – confirm with a pressure test before pulling the head.
When a head comes off, have it pressure-tested and checked for cracks around the valve seats and deck, and have the deck surface measured for flatness within the manual’s limit. A gas engine runs hot exhaust seats, so inspect seat recession and record valve heights – resurfacing beyond limit calls for a replacement head, not another skim.
To fit a new head, clean both deck surfaces to bare metal without gouging, fit the specified head gasket dry and in the correct orientation, and lower the head squarely. Follow the manual’s bolt sequence and torque-plus-angle stages exactly, never reuse stretched head bolts, then set valve lash cold to specification before the first start.
After fitting, run the break-in procedure, retorque or recheck per the manual, and re-set valve lash after the first hot/cold cycle. Gas engines reward frequent lash checks – tight lash burns seats, and burned seats are exactly what this new head exists to prevent.
Price Reference (USD)
As a reference, the N GAS ENGINE CYLINDER HEAD 4914691-10 is typically priced between USD 450 and USD 1200 depending on configuration, lot size, and current exchange rates.
Value & Service
We supply brand-new, bare cylinder heads with the casting number and revision you specify, checked against your engine serial before dispatch so the rebuild starts on the right head.
Racer Machinery helps you standardize Cummins Engine Parts procurement; the N GAS ENGINE CYLINDER HEAD 4914691-10 can be set up as a repeat order for predictable servicing.
