Testing Blowby Pressure - Komatsu PC88MR-10 Shop Manual

Hydraulic excavator

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30 Testing and adjusting

Engine and cooling system

Testing blowby pressure

a Testing tools

799-201-1504 Blowby checker

2 799T-201-3210 Plug

3 799T-201-3220 Cap

Place the machine on a level ground and

lower the work equipment to the ground.

a Check this item under the following conditions.

Coolant temperature: 75 to 94°C

Hydraulic oil temperature: 45 to 55°C

(PC88MR-A000-36C-K-00-A)

1. Open the engine hood.

2. Loosen clamp (1).

3. Disconnect KCCV gas outlet hose (2), block the

hose by using plug E2, and block KCCV hose

insertion pipe by using cap E3.

4. Loosen clamp (3).

5. Disconnect KCCV gas inlet hose (4), block

KCCV hose insertion pipe by using cap E3,

install tool and adapter [1] of the blowby checker

to hose (4), and connect gauge [2].

6. Start the engine, and set the working mode to

power mode (P).

7. Measure the blowby pressure when the

hydraulic relief is made by arm IN operation at

engine high idle.

a Read the blowby gas pressure when the

gauge pointer stands still.

(PC88MR-A000-360-K-02-A)

8. After finishing the measurement, remove the

testing tools, and restore the machine.

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