Housings For Reman Engines
Oil pumps on Caterpillar engine models 3408 (S/N 28V1-Up), 3406B (S/N 3ZJ1-Up), C-15 (S/N EGH1-Up, MBN1-Up, 6NZ1-Up and 9NZ1-Up) C-16 (S/N 7CZ1-Up), C-18 (S/N CJP1-Up, MDP1-Up, MEP1-Up) and C15 (S/N SDP1-Up, BXS1-Up, MXS1-Up and NXS1-Up) may be assembled with two different types of housings.
One of the housings has a drilled oil gallery (see Figure 1) and the other housing does not (see Figure 2). The housing with the drilled oil gallery allows the pump to send oil to a passage that allows lube for an idler gear in the gear train.
For 3406 pumps with plugged passages, a housing with a drilled oil passage is not needed. These pumps can be remanufactured using either housing. However, if you receive a 3406 oil pump with a housing that has a drilled oil gallery, then you must also use the 2S-7905 pipe plug. If the plug is not in place, the pump will move oil, but the pressure is lost because the oil is not diverted to the proper oil gallery. For 3408/3412 oil pumps with open oil passages, use a housing with a drilled oil gallery. These pumps must be manufactured with the housing that has the 2S-7905 pipe plug installed.
Revised Fuel Level Sending Unit
Effective April 30, 2007, Mack implemented a revised fuel level sending unit (Part No. 16MB421M) into production on GU, CTP and CT model chassis to address issues concerning the fuel cap tether chain entangling with the float arm. The revised sending unit, which replaces the old sending unit (Part No. 16MB419M), is rotated 90 degrees on the mounting flange so that the float arm is positioned away from the fuel tank cap when installed on the fuel tank.
Leak Testing Oil Coolers
A high percentage of the OR-9056 oil cooler core assemblies on Caterpillar engines that are returned for leaks will pass the leak test in Special Instruction REHS1758. As of May 1, 2007, all OR-9056 oil cooler core assemblies that are returned will be leak tested. All assemblies that pass the leak test will be returned to the dealer and the claim will be denied.
Special Instruction REHS1758, Test Procedure For Brazed And Rubber End Sheet Oil Cooler, provides technicians with a listing of tooling and the steps that are required to properly test for leaks in oil coolers that have brazed or rubber end sheets.
Diagnosing Turbocharged Diesel Engines
BorgWarner Turbo & Emissions Systems offer possible causes for several common problems with turbocharged diesel engines.
