Illustration 69 4C-6500 Digital Thermometer

TM 9-2320-312-24-2

Testing and Adjusting Section

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Illustration 69

Illustration 71

4C-6500 Digital Thermometer

9U-7400 Multitach Tool Group

The 4C-6500 Digital Thermometer is used in the

The 9U-7400 Multitach Tool Group is used to

diagnosis of overheating conditions and in the

check the fan speed. Refer to Operating Manual,

diagnosis of overcooling conditions. This group can

NEHS0605, "9U-7400 Multitach Tool Group " for

be used to check temperatures in several different

the testing procedure.

parts of the cooling system. Refer to Operating

Manual, NEHS0554, "4C-6500 Digital Thermometer

The 9U-7400 Multitach Tool Group can measure

Group" for the testing procedure.

engine rpm from a magnetic pickup. This magnetic

pickup is located in the flywheel housing. The

magnetic pickup also uses the ability to measure

engine rpm from visual engine parts that are

rotating.

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Illustration 70

8T-2700 Blowby/Air Flow Indicator

The 8T-2700 Blowby/Air Flow Indicator is used to

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Illustration 72

check the air flow through the radiator core. Refer to

Special Instruction, SEHS8712, "Using the 8T-2700

1U-6602 Photo-Tachometer

Blowby/Air Flow Indicator" for the test procedure

for checking blowby.

The 1U-6602 Photo-Tachometer is a

photo-tachometer that is held by hand for

general use. The 1U-6602 Photo-Tachometer is

a phototach, so this tachometer only registers

basic input frequency on any visible, rotating part.

The basic input frequency equals one revolution

per a piece of reflective tape. The 1U-6602

Photo-Tachometer does not replace the 9U-7400

Multitach Tool Group.