Water pump malfunctions are fraught with serious trouble. One of the most common breakdowns is coolant leaks, which can lead to overheating and seizure of the engine.
Bearing wear and coolant leakage from the drain hole are the main defects of the VAZ-2115 pump. Bearing wear can be recognized by its characteristic howling sound. Repairing a water pump with such defects, as a rule, does not give the desired results, which is why it needs to be replaced as an assembly.
Replacement of the VAZ - 2115 pump is carried out only on a cold engine. After the engine has cooled down, drain the coolant into a suitable container by unscrewing the plug at the bottom of the radiator and on the cylinder block.
Tools
In order to change the pump for a VAZ - 2115 you will need: wrenches for 10, 17 and 19, a screwdriver, a stroboscope. The latter is necessary to check the correct installation of the ignition.
Operating procedure
First you need to disconnect the negative terminal from the battery. Remove the timing belt protective cover and set the piston of the first cylinder to TDC of the compression stroke. To do this, place the mark on the flywheel opposite the cutout in the plate. In this case, the marks on the camshaft pulley and the teeth of the cover fastening must also coincide.
After removing the timing belt, do not turn the camshafts and crankshafts.
Now remove the toothed belt tensioner and camshaft pulley. When removing the latter, be careful not to lose the key that secures the pulley to the shaft. Next, remove the nut and four bolts that secure the rear camshaft cover. Now move the back cover aside and carefully remove the water pump by prying it over the toothed pulley with a screwdriver.
Install the new pump upside-down. Before installing it, you need to check the tightening of the pump bearing retaining screw and, if necessary, tighten it. The number on the pump must face up when installed.
The camshaft pulley is installed with a lip towards the engine. The key can be fixed with a small amount of thick grease so that it does not fall out of the slot. Use a large screwdriver or spade to keep the pulley from turning when tightening the bolt.
After installing the timing belt, it is necessary to check the quality of its installation. To do this, crank the crankshaft several times and try to set the marks again. When set correctly, all marks should match. If they do not match, reinstall the timing belt.
Do not over tighten the timing belt. This greatly shortens its service life.
Adjust the timing belt tension and fill with coolant. Before pouring the antifreeze, do not forget to tighten the plugs on the radiator and cylinder block in place.
Start the engine and check the operation of the pump - there should be no antifreeze leaks. Upon completion of all work, make sure that the ignition is set correctly using a stroboscope.
