VAZ 2108 / VAZ 2109 / VAZ 21099, online lubrication system

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Repair of oil pump for VAZ 2108, 2109, 21099 cars

Based on the fact that the entire work of the oil pump consists of rotating the gears in the housing, with minimal clearances, its repair on VAZ 2108, 2109, 21099 cars comes down to defectiveness and rejection of worn parts after several control measurements.

Despite the fact that this unit has a long service life and rarely fails, the use of low-quality motor oil, and the considerable mileage of the engines of these no longer young cars (far exceeding 100,000 km - the trouble-free service life of the oil pump) leads to gradual or sudden (for some) his refusal.

You should not immediately rush to repair the oil pump when the emergency oil pressure lamp on the instrument panel lights up. To begin with, you should change the oil filter, engine oil, check the oil pressure sensor, and clean the oil intake in the car engine sump. If it doesn't help, then go ahead.

To repair the oil pump, you will need special tools: a micrometer (with limits from 0 to 25 mm), a caliper. As well as a metal ruler and a set of flat probes. If they are not there, then it is better not to repair the oil pump, but to replace it with a new one (since the price of special tools will be higher than the price of a new pump).

Features of oil pump repair for VAZ 2108, 2109, 21099 cars

— We remove the oil pump from the car engine , disassemble it and wash it (with diesel fuel or kerosene). Blow with compressed air. Particular attention should be paid to flushing the pressure relief valve holes, as debris getting under the valve is one of the most common causes of oil pump failure.

pressure reducing valve holes for flushing

— Visually inspect the oil pump.

Its parts (working surface of the housing, gears) should not show signs of severe wear: scratches, cracks, crumbling. The pressure reducing valve and the hole for it should not have pronounced longitudinal marks.

the working surface of the oil pump housing 2108 under the drive and driven gears should not have deep marks

Next, we check how worn the driven and driving gears are, and their workplace.

— We measure the size of the gap between the plane of the housing and the gears.

We apply the ruler with its edge to the plane of the pump housing and use a feeler gauge to measure the gap between the ruler and the gears. The clearance for the drive gear is 0.12 mm, the driven gear is 0.15 mm.

measuring the gap between gears and ruler

— We measure the thickness of the drive and driven gears.

We use a micrometer. The thickness of the drive gear is 7.45 - 7.47 mm (nominal), the maximum size is 7.42 mm. The thickness of the driven gear is 7.45 - 7.47 mm (nominal), the maximum size is 7.35 mm.

measuring the thickness of the drive and driven gears of the oil pump 2108

— We measure the diameter of the driven gear seat and the thickness of the partition between the drive and driven gears in the pump housing.

We use a caliper. The diameter of the driven gear seat should not exceed 75.1 mm. The minimum thickness of the dividing wall between the driven and driving gears (segment) is 3.4 mm.

measuring the mounting hole of the driven gear and the thickness of the segment in the oil pump housing

We carry out additional checks (optional).

— We check the presence or absence of deformation of the plane of the oil pump housing cover.

Place it on a flat surface and rock it. There shouldn't be any gap. If there is deformation, it can be eliminated by grinding.

the plane of the oil pump housing cover 2108 for grinding

— We measure the diameter of the hole for the pressure reducing valve (12.03 mm).

— It is also advisable to measure the size of the pressure reducing valve spring

Without load - 44.72 mm and under load 4±0.24 kgf - 31.7 mm.

pressure reducing valve spring length

Rejected parts should be replaced with new ones, measurements taken again, lubricated with engine oil and installed on the engine. Before installation, clean the oil intake receiver.

In addition, it is advisable to replace the crankshaft oil seal pressed into the pump housing.

Notes and additions

— More unpleasant reasons for the emergency oil pressure light to come on and the pressure in the engine lubrication system to decrease include cranking or wear of the liners on the crankshaft and wear of the crankshaft journals (this is already an engine overhaul).

— The oil pump pressure reducing valve plug is tightened with great force. Before unscrewing, carefully clean it from dirt and use a high-quality edger with un-licked edges for unscrewing.

More articles on engines of VAZ 2108, 2109, 21099 cars

— The emergency oil pressure lamp is on, reasons

— Blue smoke from the muffler, causes

— Oil pump design for VAZ 2108, 2109, 21099 engines

— Selecting motor oil for the engine of VAZ 2108, 2109, 21099 cars

— Oil pressure sensor VAZ 2108, 2109, 21099

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Design

Oil pump VAZ 2109

Today there are three types of pumps:

2-gear pumps, in which one gear is connected to a shaft, which starts working from the intermediate or camshaft of the VAZ. This pump is installed inside a sump located in the lower area of the cylinder block. Typically, the rotation speed of the element is ½ the rotation speed of the motor.
A gerotor pump has a rotating small gear inside an outer gear. This pump is located in the lower area of the motor in the sump.

Source

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Checking the pressure sensor

Oil pump cover VAZ 2109

If there is no unusual noise coming from the engine and the oil level is normal, the warning light may still sound indicating low oil pressure. Then, most likely, the problem will be with the oil pressure sensor. This sensor is usually located on the motor block. Inside the device there is a spring-loaded diaphragm, as well as an automatic switch diaphragm, which is highly sensitive to pressure. This switch is designed to close the low pressure warning light circuit when the pressure drops below a certain level. Reasons for sensor failure:

if the diaphragm stops moving;
when the switch is jammed;
if the hole through which oil gets inside the sensor is clogged;
in case of unsatisfactory connection, which may be caused by corrosion, connector or wiring failure.

Attention! If the car is equipped with an electronic pressure gauge, a small rheostat will be placed inside the sensor, which, when this diaphragm moves, sends a variable voltage signal.

To check the pressure sensor, you need to connect a mechanical type pressure gauge to the pressure port located on the engine. If the device shows a satisfactory pressure reading, and the sensor gives a corresponding signal, most likely the problem lies in the sensor itself. And, conversely, if the indicators are unsatisfactory, this indicates that the pump is worn out or the oil receiver is clogged.

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