Removal and installation of the safety valve

If there is a problem in the oil circuit or the oil cooler seal is broken, the safety valve must be removed and checked, as its piston may be stuck in the up or down position.

If the valve piston is stuck in the up position, the viscous oil (with a cold engine) under high pressure will be supplied directly to the oil cooler. As a result, the radiator will be damaged.

If the valve piston sticks in the down position, the liquid oil is hot! The engine will take the path of least resistance and will not go through the oil cooler but will basically drain back into the oil sump. As a result, the body will be poorly cooled, and the shaft journals will not be sufficiently lubricated.

Removing

Use a wide screwdriver to unscrew the screw plug.

Remove pressure spring and remove safety valve. A stuck valve piston can be moved using an M10 tap, previously screwed shallowly into the piston.

Installation

Check the valve and orifice for damage before installation. If necessary, carefully remove defects in the bore and replace the valve.

Attention! A valve with nominal (16.0 mm) or repair (16.5mm) diameter.

Install the valve and spring, placing a new gasket under the screw plug. Tighten the plug to 25 Nm (2.5 kgcm).