Testing Cylinders For Leaks

NOTE: Numbers in parentheses ( ) indicate a component or tool in the associated illustration.

Procedure
1. Warm up engine up to normal operating temperature (about 80°C)

WARNING:
^ Risk of injury to skin and eyes from scatting from hot coolant which splashes out. Risk of poisoning from swallowing coolant
^ Do not open cooling system unless coolant temperature is below 90°C.
^ Open cap slowly and allow the pressure to release. Do not pour coolant into containers for drinks.
^ Wear protective gloves, protective clothes and eye protection.

2. Open cap of expansion reservoir or radiator (2)
- Turn cap anti-clockwise to the 1st detent and release pressure.
- Then, turn cap (2) onto the 2nd detent.
3. Remove spark plugs (l9)
4. Position piston of cylinder to be tested to ignition TDC
- Rotate engine and crankshaft.
5. Connect cylinder leaktightness tester (04) as follows:
- Calibrate tester and screw connection hose into spark plug hole
6. Pressurize cylinder with compressed air and read off pressure loss on-tester (04)
- If crankshaft rotates. Install retaining lock for crankshaft/ring gear
7. If excessive pressure loss, determine cause
8. Perform the test of the other cylinders in the firing order of the engine
9. Install in the reverse order

Cylinder Leaktightness Specifications
Permissible losses total readout: less than 25%
Permissible losses at valves and cylinder head gasket: less than 10%
Permissible losses at pistons and piston rings: less than 20%