WESPC Seal Valve Stem CH11486/934871/1632478 for Perkins diesel engines

Product Specification

WESPC Seal Valve Stem CH11486/934871/1632478 for Perkins diesel engines

Application:

CH11486 / 934871 (Perkins): Perkins 2306, 2506, 2806, and 1506 series six-cylinder diesel engines (12.5-18.0 L displacement), used in FG Wilson 500-800 kVA generator sets, large agricultural tractors, mining equipment, and heavy-duty construction machinery. Each six-cylinder engine requires 12 valve stem seals (2 per cylinder: one intake, one exhaust). Specifically fits engine builds including FGA, FGB, FGD, HGA, HGB, JGA, JGZF, MGA, MGAF, MGB, MGBF, MGD, MGDF, MGE, MGEF. Common applications include Massey Ferguson high-horsepower tractors, JCB heavy excavators, and Perkins-powered gensets operating in continuous-duty environments.

1632478 (Cater): Cater 3126, 3406, C7, C9, C15, C16, and C18 diesel engines used in on-highway trucks, industrial equipment, and power generation. This seal is specifically for the exhaust valve stem in 3-valve cylinder head configurations. Each engine requires 6 seals (one per cylinder). Applications include Cater articulated trucks, wheel loaders, excavators, and heavy-duty highway trucks.

Technical specifications:

CH11486 / 934871:
Seal type: Valve stem oil seal (positive seal design)
Overall height: 12-15 mm (0.47-0.59 inches)
Outside diameter: 10-12 mm (0.39-0.47 inches)
Inside diameter (valve stem size): 9.5 mm (0.374 inches) for standard Perkins 2306/2506 valve stems
Material: Nitrile rubber (NBR) or fluorocarbon (Viton) depending on manufacturer specification
Spring tension: 0.5-1.0 N (50-100 grams) radial force
Package weight: 0.01 lbs (0.01 kg)
Package dimensions: 10.21 cm × 10.21 cm × 0.30 cm (4.02" × 4.02" × 0.12")
1632478:
Seal type: Exhaust valve stem seal (positive seal with enhanced heat resistance)
Overall height: 15-18 mm (0.59-0.71 inches)
Outside diameter: 12-14 mm (0.47-0.55 inches)
Inside diameter: 10.0 mm (0.394 inches) for Cater valve stems
Material: Fluorosilicone or high-temperature Viton (FKM) for exhaust applications
Temperature rating: -40°C to +200°C continuous, +230°C intermittent
Spring tension: 0.8-1.2 N radial force
Weight: 0.125 lbs (0.057 kg) per seal

Material & performance features:

CH11486 / 934871: Manufactured from high-grade nitrile rubber (NBR) compound with 70-75 Shore A hardness, providing excellent oil resistance and sealing performance at operating temperatures from -30°C to +120°C. The seal features a precision-molded lip with integrated garter spring that maintains consistent radial force on the valve stem, preventing oil migration into the combustion chamber while allowing controlled lubrication of the valve guide. 
1632478: Constructed from premium fluorocarbon (FKM/Viton) compound formulated for exhaust valve stem applications where temperatures exceed 200°C. The seal features a reinforced lip design with stainless steel garter spring providing 1.0-1.2 N radial force to maintain positive sealing under thermal cycling. 

Interchange part numbers:

CH11486 / 934871:
PERKINS CH11486 (primary OEM)
PERKINS 934871 (alternate OEM number, same part)
PERKINS 07433 (older reference)
KMP Brand CH11486 (warranty-backed)
Heavy Duty Pros 934871
Aftermarket Express CH11486
1632478:
CATER 1632478 (primary OEM)
CATER 102-6229 (superseded by 1632478)
CATER 1026229 (old format)
CATER 1Y-4025, 1Y4025
CATER 361-3926, 3613926
FP-1632478, M-1632478 (aftermarket prefixes)
Highway & Heavy Parts 1632478
Diesel Parts Direct DS-1632478
TRP 1632478