HOSE 5P1294 - Caterpillar

3406B/C (8TC, 5YG, 3ZJ, 5KJ, 2EK, 4CK) Truck EnginesReference: Truck Engine News, October 1991, Page 5, "New Piston Pin Retainer Used". Truck Engine News, March 1992, Page 6, Supplement, "Special Instruction, Wall Chart." Truck Engine News, April 1992, Page 2, "New Turbocharger Groups With Ceramic Turbine Wheels Used".Reference: Service Manual, 3406B Diesel Truck Engine, SEBR0544-03, Specifications.There have been several component changes in 3406 Truck Engines since 1991. Those changes are identified in the rest of this article.
Piston Pin
During 1992 a new larger diameter 7E1749 Piston Pin, which provides greater strength and fatigue resistance, is available. The new 7E1749 Piston Pin is 55.000 mm (2.1654 in) in diameter and 113.20 mm (4.457 in) long. The 8N1608 Piston Pin is smaller. It is 50.795 mm (1.9998 in) in diameter and 111.89 mm (4.405 in) long. The longer pin will reduce pin retainer groove wear caused by pin side impact.
Pistons
Two new pistons were used in 1991 models. Both pistons have an 8 mm to top ring distance and both have a low crevice volume (LCV) design for better emissions control. The 7E8656 Piston (15.6:1 compression ratio) is used in 285-330 horsepower engines. The 7E8700 Piston (15.2:1 compression ratio) is used in 350-425 horsepower engines. The 7E0489 Piston (14.5:1 compression ratio) used in the 460 horsepower engine is not changed. This piston has a 12 mm to top ring distance. The 460 horsepower piston requires a 7E3632 Piston Cooling Jet with two tubes secured by a 7E6479 Bolt. The second cooling tube sprays oil into a piston crown cavity for additional cooling.
The 7E8656 Piston (15.6:1 compression ratio) is used in all 1992 Mechanical ratings (310 to 425 hp). The 15.6:1 piston is used in the 310 hp rated electronic engine, while the 15.2:1 piston is used in the 350 to 425 hp ratings. The 14.5:1 piston continued on the 460 hp rating for 1992.
During 1992, the new 7E0292 Piston (15.6:1 compression ratio) was released to accommodate the new larger diameter 7E1749 Piston Pin and 7E1177 Pin Retainer. This piston is used in all engine rating except 460 horsepower.
Pistons using different diameter piston pins should NOT be mixed in the same engine. The result could be excessive vibration.Piston Pin Retainer
The 7E5665 Piston Pin Retainer is used with the smaller diameter 8N1608 Piston Pin. See Reference Article "New Piston Pin Retainer Used". The 7E5665 Piston Pin Retainer is in effect with 3406 Truck Engines 3ZJ6028, 5KJ7572, 2EK860, and 4CK1.
The new 7E1177 Piston Pin Retainer is used with the larger diameter 7E1749 Piston Pin. See the Effective Serial Number Chart.
Crankshaft, Bearings
The new 9Y7735 Rod Bearing (Wide) and 4P4334 Crankshaft are used on 3406 Truck Engines 5YG1 -Up, 3ZJ2830-Up, 2EK512-Up, 4CK1-Up, and 5KJ1-Up.
The 4P4334 Crankshaft can be retrofitted into any 3406B/C Truck Engine with the corresponding rod assemblies, bearings, and damper.
Mid-life Bearing Roll-in Recommendations
Engines with the new 9Y7735 Connecting Rod Bearings DO NOT require a mid-life connecting rod bearing roll-in unless the following severe service conditions are encountered.
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