WHEEL AR-FINAL DRIVE & BRAKE 1724827 - Caterpillar

(4FD, 1RK),
G3408 (6NB, 8YR),
G3408B (6RJ),
G3408C (3WR),
G3412 (7DB, 3NK, 6ZM, 9RR) EnginesSUPPLEMENT: DECEMBER 1998Engine News SEBD9258, Article 10, Page 8, March 1998; "New Piston Cooling Jet Tube Assembly Provides Increased Piston Clearance".Disregard this article. See Engine News SEBD9267, Article 4, Page 2 titled "New Piston Cooling Jet Tube Assembly Provides Increased Piston Clearance For Engines With Gallery Cooled Pistons".
--------------- END SUPPLEMENT ---------------Description of Change: A new piston cooling jet tube assembly is used on these engines. This new tube assembly provides more clearance between the tube assembly and the inside of the piston skirt than the former tube assembly. This increased clearance will prevent the new tube assembly from contacting the piston which could result in a broken tube assembly. Also, on the G3406 Engines only, the cylinder block groups has been changed to allow the bolt that fastens the piston cooling jet tube assembly to the cylinder block to be changed from a 3/8inch bolt to a 7/16inch bolt. The new 7/16inch bolt has a machined flat that allows an increased oil flow from the piston cooling jet tube assembly.
Adaptable To: The new 155-4011 Piston Cooling Jet Tube Assembly is a direct replacement for the former 6I-2992 Piston Cooling Jet Tube Assembly in the above engines. The former tube assembly is canceled. The chart lists the effectivity of the new 155-4011 Piston Cooling Jet Tube Assembly. For G3406 Engines only, the 110-2099 Cylinder Block Group has been changed to use 151-5925 Bolts (7/16inch), instead of the 7E-6479 Bolts (3/8inch), to fasten the piston cooling jet tube assemblies to the cylinder block. This change is effective at the same time as the new 155-4011 Piston Cooling Jet Tube Assembly.