INJECTOR GP-FUEL 20R7170 - Caterpillar

And 3306 Direct Injection EnginesIt has been found that some engines give better performance if the fuel injection timing tolerance is less than the 1° normally permitted. One example of this is, some engines with 18° BTC static timing were found to give best performance if fuel injection timing is put at 18.0° 0.5° BTC. In this example, if the pin timing method is used, the static fuel injection timing will be 18 1° BTC.
On these engines the fuel injection timing can be more exactly adjusted by the fuel flow method. The 6V2023 Flow Check Adapter Group, 1P540 Flow Checking Tool Group, 6V2056 Rod, 6V2057 Contact Point, 9S215 Dial Indicator and 3P1565 Collet can be used to do this on 3304 and 3306 DI Engines with static (stationary) timing not earlier than 20° BTC. The 6V2056 Rod and 6V2057 Contact Point were originally released to find piston top center.
Special Instruction, Form SMHS7083, gives complete instructions to check fuel injection timing by the Fuel Flow Method with the above tools.