1995/01/01 Caterpillar

Electronic Unit Injector (EUI) Replacement{1290}

Usage:

3176B (9CK),
3406E (5EK) Truck Engines

Reference: Electronic Troubleshooting 3176B And 3406E Diesel Truck Engine, Form No. SENR5582-01

Consult the Reference to determine if a specific EUI is malfunctioning. The replacement of a defective injector utilizing this procedure normally resolves performance complaints.

Numerous replacement sets of EUIs that were returned from the field have been carefully evaluated. In each case the customer complaint was low power or high fuel consumption. Each case of unacceptable performance was carefully evaluated with respect to dynamometer fuel rates, wheel horsepower, injector fuel flow on test benches, injector spay pattern, and subsequent customer feedback. Our investigation indicates replacing the majority of EUIs, or complete sets of EUIs is unnecessary in most cases. Long term gains in fuel economy or power are not occurring as a result of replacing all or most of the EUIs.

Chronic power or fuel economy complaints should be carefully evaluated on a certified PAR dynamometer, with specific attention to fuel rate. If an engine is found to have fuel rates below specifications, contact a service analyst to discuss possible solutions.

Caterpillar Information System:

1995/01/01 New Oil for All Engines Burning Low-Sulfur Fuel (0.05% or less) Except The 3600 Family Of Engines{1318}

1994/12/01 Black Painted Valve Covers Available{1107}

1994/12/01 New Exhaust Manifold Gasket Available{1059}

1994/12/01 Cold Weather Operation Reminder{0374}

1994/11/01 Be Sure Correct Piston Cooling Jets Are Installed{1331}

1994/11/01 Engine Oil Capacity Change{1326,7542}

1994/11/01 Unit Injector Removal And Installation{1290}

1994/11/01 Fuel System Pressure{1256}

1994/11/01 Fuel Injection Nozzle Reference {1254}

1994/11/01 Verification of Connecting Rod Eye Bushing Retention When Overhauling Engines{1218}

1994/10/01 New Engine Crankshaft Rubber Damper Assembly Uses Improved Rubber Material{1205}

1994/10/01 Check 9U-7242 Valve Spring Compressor Plate For Correct Thickness{0703}

1995/01/01 Description Of January 1995 (JAN95) Personality Module Changes {1902}

1995/01/01 Electronic Timing Advance Improvements{1272,1253,1264}

1995/02/01 Special Electronic Control Module (ECM) Used With J1939 Data Link And Eaton Autoshift Transmission{1901}

1995/02/01 Fabricated Tool For Holding Air Compressor Drive Gear While Tightening Nut On Compressor Crankshaft{0600,1803}

1995/02/01 New Inlet And Exhaust Valves Have Thinner Heads{1105}

1995/02/01 Returning Core Engines For Full Refund {0374}

1995/03/01 New Fuel Injection Pump Group{1251}

1995/03/01 Governors Now Use New Low Mass Weight Carrier{1272}

1995/03/01 Improved Air Fuel Ratio Control (AFRC){1278}

1995/03/01 Used Engine Oil From 1995 3406C (8PN) Truck Engines Is Darker In Color{1318}

1995/03/01 Jacket Water Pumps Now Include New Tapered Roller Bearings{1361}

1995/03/01 Do Not Install A Water Pump Designed For The 3406E Truck Engine On 3406, 3406B Or 3406C Engines{1361}