Using FT1984 Air-to-Air Aftercooler Test Group
(1) Regulator and valve assembly. (2) Nipple. (3) Relief valve. (4) Tee. (5) Coupler. (6) Aftercooler. (7) Dust plug. (8) Dust plug. (9) Chain.
A low power problem in the engine can be the result of aftercooler leakage. Low power, low boost pressure, black smoke, and/or high exhaust temperature can be the result of an aftercooler system leakage.
A large cooler core leak often can be found by making a visual inspection. To check for smaller leaks, use the following procedure:
1. Disconnect the air pipes from the inlet and outlet side of the aftercooler core.
2. Install couplers (5) and dust plugs (7) & (8) from the FT1984 Air-to-Air Aftercooler Test Group as shown on each side of the aftercooler core. Installation of additional hose clamps on hump hoses is recommended to prevent the hoses from bulging while the aftercooler core is being pressurized.
3. Install regulator and valve assembly (1) on the outlet side of the aftercooler. Attach air supply.
4. Open air valve and pressurize the aftercooler to 205 kPa (30 psi). Shut off air supply.
5. Inspect all connections for air leakage.
6. System pressure should not drop more than 35 kPa (5 psi) in 15 seconds.
7. If the pressure drop is more than specified, use a solution of soap and water to check all areas of possible leakage and look for air bubbles. Replace hoses or repair the aftercooler core as needed.
8. After testing, remove FT Tooling and connect air pipes on each side of the aftercooler.