2003/11/10 Caterpillar

Fuel Inlet Screens are Removed from Remanufactured Fuel Injectors {1250, 1252}

Usage:

793B 1HL

Caterpillar Products: Machine Engines
All 3500 Series

Service Magazine SEPD0685, 02 June 2003, "Fuel Inlet Screens Are Removed From Remanufactured Fuel Injectors ". Disregard this article. This article has been replaced by the following article.

Reports have been received about problems with the fuel inlet screens for the fuel inlet ports on the fuel injectors. To improve reliability, Cat Reman has removed the fuel inlet screens from all remanufactured fuel injectors for 3500 Engines.

Extensive field tests were performed on the fuel injectors without the screens. No significant difference in the wear of the fuel injectors was found in comparison to fuel injectors with screens.

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Illustration 1	g01002256
Typical example of a fuel inlet port on the case of a fuel injector

A washer is installed in place of the fuel inlet screen. Installation of the washer depends on the geometry of the case and on the previous method of screen installation.

The washers are roll formed onto new cases and onto cases that had staked screens.

The washers are welded onto the cases that had welded screens. The geometry of these cases do not have sufficient material for roll forming.

For Electronic Unit Injectors (EUI), serial number 195245 has welded washers. Serial number 198960 has washers that are roll formed.

For Mechanical Unit Injectors (MUI), serial number 124341 has washers that are roll formed.

The part numbers of the modified fuel injectors are listed in Table 1.

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Table 1
Remanufactured Fuel Injector Groups for 3500 Engines
3500 with MUI	3500 with EUI	3500B
0R-0906	0R-7780 ⁽¹⁾
0R-0995	0R-7977
0R-1756	0R-8215
0R-1758	0R-8619
0R-1759	0R-8688
0R-1760	0R-8690
0R-2921	0R-8691
0R-2922	0R-9735
0R-2923	0R-9796
0R-2924	0R-9944
0R-2925	0R-3539	-
0R-3051	0R-4149	-
0R-3052	-	-
0R-3743	-	-
0R-8338	-	-
0R-8680	-	-
0R-8681	-	-

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The fuel inlet ports for this fuel injector are modified by two different methods. Some of the cases have fuel inlet ports with a diameter of 2.8 mm (0.11 inch). The remainder of the cases have washers that are roll formed. None of these fuel injectors have welded washers.