Caution! The plug is under spring pressure and may pop out. Please exercise caution. The sealing ring needs to be replaced. Knock the piston out of the valve hole.
1. Remove the bolts and pump cover (illustrated). Remove both gears from the pump.
Note: The pressure reducing valve can be replaced without removing the pump. It is located on the right side of the pump looking towards the engine, next to the pulley.
The lubrication system has a bypass valve. It is located in the cylinder head. To replace it, you need to remove the cylinder head, which requires a special tool. If you have any difficulties replacing it, you should contact a car repair shop. To do this, the cylinder head is removed.
2. Carefully knock out the crankshaft oil seal using a drift.
3. Clean all parts thoroughly and visually inspect them for wear. Signs of wear on the pump cover in most cases indicate pump failure. If the parts look satisfactory, further control is carried out as follows:
4. Insert the gears into the pump body and place a steel ruler on top as shown in the illustration. Use a feeler gauge to measure the gap between the ruler and the gears. It should be 0.03-0.10 mm. If the gap is beyond the specified limits, the gears or the entire pump are replaced.
5. Measure the gap between any two gear teeth with a feeler gauge as shown in the illustration. It should be 0.175-0.225 mm. If the gap is beyond the specified limits, the gears or the entire pump are replaced as a set.
6. The spool of the pressure reducing valve must not show any signs of wear. The spring must be in good condition.
The pump is assembled in the reverse order of disassembly. Lubricate the gears generously before installation. Lubricate the cover mounting bolts with sealant. Pressure reducing valve (assembly sequence: valve, spring and plug) install on a new gasket. Tighten the plug to a torque of 30 Nm.
Install the O-ring now or when installing the pump.
Bypass valve in the cylinder head
The valve, which functions as a safety valve, is located under the threaded plug and consists of a steel ball with a spring. It is possible to dismantle the specified plug (drill a hole, screw in a screw and remove the plug with pliers). However, it is possible to replace the valve seat. It can only be removed with a puller. Installing a threaded plug requires skill. Therefore, it is recommended to perform this work in a car repair shop.
Source is on the website www.OpelBook.ru
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