AR01.00-P-1300HV Testing Cylinders For Leaks

Inspect cylinders for leaks

Shown On Engine 112:

Remove, Install

DANGER:
- Risk of accident from vehicle starting off by itself when engine running. Risk of injury suffered in the form of bruises or burns to the hands when reaching in while the engine cranks or runs.
- Secure vehicle to prevent it from moving off by itself. Wear closed and close-fitting work clothes. Do not grasp hot or rotating parts.

1 Bring engine to operating temperature (approx. 80 degrees C)

NOTE: Check the cylinder for leaks only when the engine is at normal operating temperature.

DANGER:
- Risk of injury to skin and eyes suffering scalding from contact with hot coolant spray Risk of poisoning from swallowing coolant.
- Do not open cooling system unless coolant temperature is below 90 degrees C. Open cap slowly and release the pressure. Do not pour coolant into beverage bottles. Wear protective gloves, protective clothing and eye protection.

2 Open cap (2) of expansion reservoir
- In Model 463 with Engine 112, 113, a cap (2) with a detent is built-in

NOTE:
- Turn cap carefully up to the first pre-detent, relieve the pressure and then unscrew the cap (2).
- A 1-stage cap is fitted to Model 163 with Engine 112, 113.
- Turn the 1-stage and 2-stage cap half a revolution counterclockwise, relieve the pressure, then unscrew the 1-stage or 2-stage cover.

3 Remove a spark plug (19) from each cylinder
4 Position piston of cylinder to be tested to ignition TDC.

NOTE: Crank the engine at the center bolt of the crankshaft in the direction of rotation of engine.

5 Connect cylinder leak tester (04)

NOTE: Calibrate cylinder leakage tester (04) and screw the connection hose into the spark plug bore.

6 Remove the oil filler cap (3)
7 Apply compressed air to the cylinder, read off pressure loss on the cylinder leakage tester (04) and determine the cause if there is an increased pressure loss.
- If the crankshaft rotates:
- Engine 112, 113, 137.
- Install retaining lock for crankshaft.
- Engine 285.
- Lock crankshaft with counterholder.

8 Conduct the test of the other cylinders in the firing order of the engine.
9 Install in the reverse order.