Piston Cooling Nozzle
The McBee‑Interstate McBee M‑7W4990 Piston Cooling Nozzle is a precision-engineered jet for Caterpillar 3406 and 3408 diesel engines. Available from Wofford Truck Parts, this USA-made component ensures proper piston oil cooling and maintains DPI-based OEM specifications. Manufactured in ISO 9001:2015-certified facilities, it helps prevent overheating and piston wear. Backed by a two-year unlimited mileage warranty, it's essential for engine rebuilds, service shops, and heavy-duty fleet maintenance.
$21.67
Specifications
The M‑7W4990 Piston Cooling Nozzle, produced by McBee‑Interstate McBee and offered through Wofford Truck Parts, is engineered for precise oil jet cooling in Caterpillar 3406 and 3408 series engines. This nozzle delivers critical lubrication directly to piston crowns, helping reduce heat, lower piston temperatures, and minimize wear—vital for heavy-duty and vocational applications.
Manufactured at ISO 9001:2015–certified U.S. facilities, it meets stringent quality standards and is fully backed by Interstate‑McBee’s 2‑year unlimited mileage warranty on engine parts. Designed as a direct replacement for Caterpillar OEM 7W4990 and 290‑6568, it restores factory-spec piston cooling performance without modification.
This part is essential during engine overhauls and rebuilds of CAT 3400-series inline‑6 engines. It ensures effective piston cooling, improved durability, and reliable operation in demanding diesel environments—making it a trusted component for professional technicians and heavy-duty service fleets.
Compatibility
Caterpillar 3406B engines (CPL prefix 3ZJ/4MG) - 1980s through early 2000s)
Caterpillar 3406E / C15 / C15 Acert - 1980s through early 2000s)
Caterpillar 3408 engines - 1980s through early 2000s)
Alternative Part Numbers
M‑7W4990
2906568
CATERPILLAR 290‑6568
CATERPILLAR 7W4990
INTERSTATE‑MCBEE M‑7W4990
PAI 345009