5033150 JOHNSON TUBE, CDI LEAD

Illustration 1 g00286266
Boiling Point Of WaterRemember that temperature and pressure work together. When a diagnosis is made of a cooling system problem, temperature and pressure must be checked. Cooling system pressure will have an effect on the cooling system temperature. For an example, refer to the Illustration 1. This will show the effect of pressure on the boiling point (steam) of water. This will also show the effect of height above sea level.Test Tools For Cooling System
Table 1
Tools Needed     Quantity    
4C-6500     Digital Thermometer     1    
8T-2700     Blowby/Air Flow Indicator     1    
9U-7400     Multitach     1    
9S-8140     Pressurizing Pump     1    
Making contact with a running engine can cause burns from hot parts and can cause injury from rotating parts.When working on an engine that is running, avoid contact with hot parts and rotating parts.
Illustration 2 g00286267
4C-6500 Digital Thermometer The 4C-6500 Digital Thermometer is used to test for any overheating conditions or for any cooling problems. This group can be used to check temperatures in several different parts of the cooling system. Refer to the testing procedure in Operating Manual, NEHS0554.
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8T-2700 Blowby/Air Flow Indicator The 8T-2700 Blowby/Air Flow Indicator is used to check the air flow through the radiator core. Refer to the testing procedure in Special Instruction, SEHS8712.
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6V-3121 Multitach
Steam or hot coolant can cause severe burns.Do not loosen the filler cap or the pressure cap on a hot engine.Allow the engine to cool before removing the filler cap or the pressure cap.
Check the Filler Cap
One cause for a pressure loss in the cooling system can be a worn seal on the filler cap.
Steam or hot coolant can cause severe burns.Do not loosen the filler cap or the pressure cap on a hot engine.Allow the engine to cool before removing the filler cap or the pressure cap.
After the engine is cool, loosen the filler cap. Then, allow the pressure out of the cooling system. Remove the filler cap.
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Typical Schematic of Filler Cap (1) Sealing surface of cap and radiator. Inspect the filler cap carefully. Look for damage to the seal or to the surface that seals. Any foreign material or deposits must be removed. Check for foreign material and for deposits in the following locations:
The filler cap
The filler cap seal
The sealing surface for the filler capUse the 9S-8140 Pressurizing Pump to test filler caps. Also, use the pressurizing pump to check the cooling system for leaks.
Steam or hot coolant can cause severe burns.Do not loosen the filler cap or the pressure cap on a hot engine.Allow the engine to cool before removing the filler cap or the pressure cap.
Use the following procedures for checking the filler cap:
After the engine is cool, loosen the filler cap to the first stop. Allow the pressure out of the cooling system. Then remove the filler cap.
Put the filler cap on the 9S-8140 Pressurizing Pump .
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9S-8140 Pressurizing Pump (1) Adapter. (2) Hose. (3) Release Valve.
Look at the gauge for the exact pressure that makes the filler cap open.
Compare the reading on the gauge with the filler ca