CARRIER ROLLER ASSY. 0990178 - Caterpillar

Engine: G3516B (S/N: JEF1-UP) G3520B (S/N: GLF1-UP)Petroleum Engine: G3520B (S/N: TPC1-UP)Introduction
The following procedure describes installation for the 378-8458 Solenoid Valve Gp .The new solenoid valve group seals the gas supply from the engine during shutdown at high operating pressures. Sealing the gas at high operating pressures reduces restarting difficulty, or backfiring.Required Parts
Table 1 contains the parts needed for installation of the solenoid valve group. Table 2 contains the parts that are reused.
Table 1
Item    Qty    New Part Number    Part Description    
1     1     378-8458     Solenoid Valve Gp    
2     1     419-6617     Tube As    
3     1     420-5122     Tube As    
4     2     420-8789     Gasket    
5     1     424-1117     Bracket    
6     2     425-3549     Gasket    
7     8     4K-0367     Full Nut    
8     16     5P-8247     Hard Washer    
9     8     9X-8881     Bolt    
Table 2
Item     Qty     Part Number     Part Description    
10     4     7X-0325     Bolt    
11     4     237-0927     Bevel Washer    
12     8     8T-4223     Hard Washer    
13     4     6V-8188     Nut    
14     1     293-8396     Core    
15     8     4L-9337     Bolt    
16     8     8T-4896     Hard Washer    
17     1     265-5255     Plate    
18     4     8T-2502     Bolt    
19     4     5P-1075     Hard Washer    Disassembly
Shut down the engine and shut off the gas supply to the fuel lines.
Purge fuel from the fuel lines and gas shutoff valve.
Remove the current gas shutoff valve, fuel piping, and fuel gas heater.Installation
Illustration 1 g03346601
378-8458 Solenoid Valve Gp
Illustration 2 g03346606
(3) 420-5122 Tube As
Install tube (3) so that when the gas shutoff valve is installed. the valve is positioned vertically.