1993/01/25 Caterpillar

Check Engine Water Pump Impeller Face Clearance If The Engine Experiences Symptoms Of Overheating {1361}

Usage:

Caterpillar Machines Powered By 3204 (7YJ, 45V, 10X) Engines

Reference: Service Magazine; November 30, 1992; Page 10; "Procedure To Replace Cylinder Head Gasket."

Reference: Special Instruction, Form No SMHS7090, "Water Pump Reconditioning Using The 9N3139 Rebuild Kit and 5P7361 Tool Group."

If an engine displays symptoms of overheating, such as a damaged head gasket, warped cylinder head, cracked exhaust manifolds, etc., check the water pump impeller clearance. For optimum water pump performance, the clearance (A) between the water pump housing and the impeller should be 0.35 to 1.14 mm (.014 to .045 in). See the illustration

Location to check water pump impeller face clearance.

If the clearance is not correct, the Reference Special Instruction provides information on rebuilding the water pump and setting the correct clearance. An 8T3142 Impeller Installer can also be used to set the correct clearance.

Caterpillar Information System:

1993/01/25 Unit Injector Tip Seal Deterioration {1290}

1993/01/25 Drive End Bearing Service For 50/75 Amp Brushless Alternators {1405}

1993/01/25 Special Instruction For Installing VR3 Voltage Regulator On SR4 Generators Now Available {4450}

1993/01/25 New Connecting Rod Bearing Used In Piston And Rod Groups {1219}

1993/01/18 New Cylinder Head Group Used To Help Reduce The Amount Of Oil On The Valve Stems {1102,1109,1104}

1993/01/18 New Exhaust Manifold Group Will Help Reduce Vibration On Bellows {1059}

1993/01/18 New Grommets With Higher Temperature Capacity Used In Clamp Assemblies {1307,1052}

1993/01/18 New And Remanufactured Fuel Injector Reference {1290}

1993/01/18 Cylinder Pack Puller Groups Improved {0705,1239}

1993/01/18 Part Number References For 0R2818, 0R2819, And 0R3231 Remanufactured 3208 Truck Engines {0374}

1993/01/18 New Videotape "Detection of Air and Combustion Gases in the Cooling System" Available {0374,1350}

1992/12/21 New Bellows Assemblies Used In Turbocharger Groups{1052,1059}

1993/02/01 New 9U6101 Lower Pilot Reamer Group Available{0670,1125}

1993/02/08 Maintenance Tips For 6I0799 Exhaust Restrictor; Additional Spring Improves Performance Of 6I0799 Exhaust Restrictor{1119,1061,1088}

1993/02/15 Procedure To Determine Idler Height {4159}

1993/02/15 Aftercooler Core And Turbocharger Compressor Wheel Cleaning Interval {1317,1052,1054,1060}

1993/02/15 New Breather Group And Fumes Disposal Group Help Reduce Oil In Blow-By Fumes {1317}

1993/02/15 New Tank Assemblies Used In Expansion Tank Groups; New Pressure Cap; New Coolant Recovery System Available {1354,1392}

1993/02/15 Maximum Wiring Harness Extension Length Specification {1408,7451}

1993/02/15 New Oil Pump Groups Do Not Require Key On Drive Shaft {1304}

1993/02/15 Valve Seat Insert Removal Tools {0703,1103}

1993/02/15 New Water Seals Used In Cylinder Head Groups; New Water Seal Assemblies And O-Ring Seals Used In Insert Kit {1115}

1993/02/15 Low Idle Operating Expense

1993/02/22 New Voltage Regulators Provide Improved Reliability{1410,1405}