5036691 JOHNSON BOLT

Illustration 1 g00286266
Cooling system pressure at specific altitudes and boiling points of water
Personal injury can result from hot coolant, steam and alkali.At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns.Remove filler cap slowly to relieve pressure only when engine is stopped and radiator cap is cool enough to touch with your bare hand.Cooling System Conditioner contains alkali. Avoid contact with skin and eyes.
The coolant level must be to the correct level in order to check the coolant system. The engine must be cold and the engine must not be running. After the engine is cool, loosen the pressure cap in order to relieve the pressure out of the cooling system. Then remove the pressure cap.The level of the coolant should not be more than 13 mm (0.5 inch) from the bottom of the filler pipe. If the cooling system is equipped with a sight glass, the coolant should be to the correct level in the sight glass.Making the Correct Antifreeze Mixtures
Do not add pure antifreeze to the cooling system in order to adjust the concentration of antifreeze. Refer to Operation and Maintenance Manual, "Refill Capacities" for the correct procedure. The pure antifreeze increases the concentration of antifreeze in the cooling system. The increased concentration increases the concentration of dissolved solids and undissolved chemical inhibitors in the cooling system. The antifreeze mixture must consist of equal quantities of antifreeze and clean soft water. Concentrations of more than 50% of antifreeze may have the adverse effect on the performance of the coolant. Refer to Operation and Maintenance Manual, "Refill Capacities" for the correct antifreeze mixture.Test Tools For The Cooling System
Table 1
Required Tools
Tool Part Number Part Name Qty
A 4C-6500 Digital Thermometer 1
B 8T-2700 Blowby/Air Flow Indicator 1
C 9U-7400 Multitach Tool Group 1
D 9S-8140 Pressurizing Pump 1
E 1U-7297 Coolant/Battery Tester 1
F 1U-7298 Coolant/Battery Tester 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.
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4C-6500 Digital Thermometer
Tooling (A) is used in the diagnosis of faults that cause overheating or overcooling in the engine. This tool can be used to check the temperature in several areas of the cooling system. The testing procedure is in Tool Operating Manual, NEHS0554.
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8T-2700 Blowby/Air Flow Indicator
Tooling (B) is used to check the air flow through the radiator core. Refer to Special Instruction, SEHS8712, "Using the 8T-2700 Blowby/Air Flow Indicator" for the test procedure for checking blowby and air flow.
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9U-7400 Multitach Tool Group
Tooling (C) is used to measure the fan speed. Refer to Operating Manual, NEHS0605, " 9U-7400 Multitach Tool Group" for the testing procedure.
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9S-8140 Pressurizing Pump
Tooling (D) is used to test the filler caps. This tool is also used to pressure test the cooling system for leaks.
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1U-7297 Coolant/Battery Tester or 1U-7298 Coolant/Battery Tester
Check the coolant frequently in cold weather for the correct glycol concentration. Use either Tooling (E) or Tooling (F) in order to ensure adequate freeze protection. The testers are identical except for the temperature scale. The testers give immediate, accurate readings. The testers can be used for