PIPE AS-EXHAUST 7E3560 - Caterpillar

Pressurized System: Hot coolant can cause serious burns. To open the cooling system filler cap, stop the engine and wait until the cooling system components are cool. Loosen the cooling system pressure cap slowly in order to relieve the pressure.
Table 1
Tools Needed
9S-8140 Pressurizing Pump One cause for a pressure loss in the cooling system can be inadequate sealing of the pressure cap.After the engine is cool, loosen the pressure cap and allow the pressure out of the cooling system. Then remove the pressure cap. Inspect the pressure cap carefully. Look for damage to the seal or to the sealing surface. Any foreign material or foreign deposits that accumulate on the following parts must be removed: cap, seal and sealing surface.
Illustration 1 g00296067
Typical schematic of filler cap
(1) Sealing surface of both filler cap and radiator
Illustration 2 g00286369
9S-8140 Pressurizing Pump
The 9S-8140 Pressurizing Pump is used to pressure test the caps and the cooling system for leaks. To check the pressure cap opening pressure, use the procedure that follows:
Remove the pressure cap from the radiator.
Put the pressure cap on the 9S-8140 Pressurizing Pump.
Look at the gauge for the exact pressure that makes the pressure cap open.
Compare the reading on the gauge with the correct opening pressure that is labelled on the cap.
The pressure cap must open within 1 psi. Otherwise, install a new pressure cap.