SHIM 2081974 - Caterpillar

Engine: G3304B (S/N: A4E1-UP) G3306B (S/N: R6S1-UP)Introduction
Do not perform any procedure that is outlined in this Special Instruction until the entire Special Instruction has been read and understood.General Requirements
Illustration 1 g02805819
Air Starter and Components Supplied
The Caterpillar supplied air starting system includes the starter motor, relay valve, control solenoid and a flow matched pressure regulator. These components, properly installed, are compatible for use with either air or natural gas.There are two options in the starter groups. Refer to Tables 1 and 2.
Table 1
Engines without starter use 359-4332 Air Starting Motor Gp    
Qty     Part Number     Description    
1     3N-4579     Hose As    
1     4H-7869     Gasket    
1     4M-5317     Reducing Bushing    
1     5F-5434     Vent Valve As    
3     5P-8247     Hard Washer    
1     6K-1972     Flared Elbow    
3     7J-8902     Bolt    
1     251-9396     Solenoid Valve Gp    
1     279-4495     Fitting    
1     348-2765     Air Starting Motor Gp    
Table 2
Engines that need the starter use 348-2765 Air Starting Motor Gp    
Qty     Part Number     Description    
1     365-6627     Air Starting Motor Gp    
4     005-8160     Bolt    
1     365-6630     Control Valve    Note: Also available is the 367-6268 Pressure Regulator Starter Supply System Operation and Requirements
The flow matched regulator will control upstream starting supply pressure, up to a maximum of 150 psig. The regulator provides flexibility for equipment packages located at sites where the supply pressure of starting gas varies.The low-pressure turbine starter delivers maximum starting power at 25 psig, which is the maximum operating pressure of the starter. To protect the starter from over pressure, the Cat supplied pressure regulator must be used wherever static upstream starting supply pressure exceeds 25 psig.To gain the benefits of low-pressure starter operation, use 1.5 inch diameter piping from the source to the starter inlet. Locate the pressure regulator as close to the engine as possible. However, not closer than 18 inches from the starter. Where the length of supply piping exceeds 50 ft, a pipe diameter of 2 inches is recommended from the gas source to the regulator.Sizing of the pipe helps minimize the flow and pressure losses in the system. Using smaller pipe sizes and/or an incompatible pressure regulator will require higher upstream supply pressures.Gas Starting
For equipment packages operating on field gas pressure, low pressure starting capabilities may eliminate the need for a starting air compressor. The starting option described here may provide engine starting, where electric starting systems and batteries are undesirable or prohibited.Starter Controls
The starting control system relay valve, solenoid, and engine software provide capabilities to start an engine manually or remotely. The engine software provides a starter lock-out, which includes a ten-second delay between remote start attempts. The lock-out protects the air starter and ring gear from improper engagement after false starts or