THERMOSTAT AS 3762701 - Caterpillar

6V2023 Flow Checking Adapter Group
The 6V2023 Flow Checking Adapter Group can be used for the flow check timing procedure for Caterpillar diesel engines. A pin, that is part of the adapter group, can be adjusted to the correct length for flow timing check of those direct injection engines that have a reverse flow check valve. This pin can be removed, and the adapter group can then be used instead of the 7M1999 Tube Assembly for flow timing check of diesel engines that do not have a reverse flow check valve. (The 7M1999 Tube Assembly is part of the 1P540 Flow Checking Tool Group.) The procedure for use of the 6V2023 Flow Checking Adapter Group for each of the two types of fuel system is as follows. 1 Assembly of the adapter group is shown above. The part names and part numbers are: 5P580 Tube (1), 4K9822 Nut (2) and 4K9821 Sleeve, 5P2948 Connector (3), 6V2021 Fitting (4), 6F612 Jam Nut (5), 6L3921 Washer (6), 6V2019 Nut (7), 6V2020 Adapter (8) and 6V2018 Pin (9). 6V2018 Pin (9) is for use only on direct injection engines that have reverse flow check valves. Do not use the 6V2018 Pin (9) when flow checking an engine that does not have reverse flow check valves.2 At first assembly of tube (1) and 4K9822 Nut (2) with the 4K9821 Sleeve, use a wrench to tighten nut (2) and swage the sleeve on tube (1). After this is done the first time, it is normally not necessary to tighten the nut with a wrench for installation of tube (1) if it has been removed. Use of the fingers (finger tight) is normally all that is needed for tube installation.3 If the engine to be flow checked is a direct injection engine that has a reverse flow check valve in each fuel injection pump, install the 6V2018 Pin (9) according to the procedure that follows. If the fuel injection pumps do not have a reverse flow check valve, do not install pin (9). 4 Loosen adapter (8) so not more than .2" (5) [dimension (A)] of pin (9) extends beyond the end of adapter (8). Temporarily remove tube (1).5 To install the adapter group on the injection pump for these engines, put the adapter group on the injection pump bonnet and tighten nut (7) to 30 lb.ft. (40 N m) maximum. Turn fitting (4) down, until pin (9) just starts to contact (resistance is felt) the reverse flow check valve, then turn fitting (4) an additional 1/4 turn.6 Move washer (6) down so it is against adapter (8) at location (B), then tighten nut (5), with fingers only, so it is against washer (6). Connect tube (1).
It must be remembered, that if the engine does not have a reverse flow check valve in each fuel injection pump, do not install 6V2018 Pin (9).
Fuel Injection Pump Timing Test
1 Piston travel from the beginning of injection to TC can be measured and converted to crankshaft degrees