Car engine repair Audi 100 C4, petrol

The structure and differences of engines
The Audi-100 car is powered by engines of various designs and cylinder counts. There is no shortage of their diversity. As the following table proves: Engine...

Basic elements
For those interested in how an engine works, below is a brief description of the most important parts before we move on to repairs and maintenance. Pistons,...

Lubrication system
The engine needs to lubricate a number of bearings and friction pairs. This is the job of the oil pump. It sucks oil from the oil pan through the inlet tube...

Crankcase ventilation
Even a properly functioning engine throws out 50-70 liters of exhaust gases per minute through the piston rings into the crankcase. This pressure must leave...

Visual inspection of the engine
TO #4 Inspect the engine. Lightly oiled areas are not a cause for concern, all engines "sweat" a small amount of lubricant from time to time. However, you...

Running in a new engine
During the first thousand kilometers, the rubbing parts of the engine (pistons and cylinders; bearings and shafts) must be able to run in. This must occur at...

Engine life
All Audi engines can easily cover 100,000 km. However, whether you can squeeze twice as much out of the engine from this mileage depends most decisively on...

Nominal and maximum speed
An internal combustion engine achieves its maximum power at a certain speed, the so-called nominal speed. Revving up more does not provide any gain in power....

Speed limitation
The absolute limit of the rotation speed is approximately at 6700 rpm. After this number of revolutions, the valve springs begin to compress and decompress so...

Measuring compression pressure
Drive a little to bring the engine up to operating temperature. Piston rings seal better when the oil is warm. Turn off the ignition and fuel supply. This is...

List of faults
Compression pressure too low Consistently low compression pressure is not necessarily a warning sign; the reason for this may also be the measurement...

Hydraulic tappets
What are hydraulic tappets used for? Due to the engine heating, the components of the valve train are stretched and lengthened. Therefore, there must be a...

Working with a toothed belt
The valves are driven, as already mentioned, by a toothed belt. It turns the camshaft half a turn of the crankshaft. The toothed belt also drives: the water...

Replacing the timing belt
4-cylinder engine Remove the V-belts or poly V-belts (chapter " Generator "). Remove the crankshaft pulley after loosening the Allen bolts (not the central...

Removal the camshaft
This job is relatively easy to do on 4- and 5-cylinder models. When working on a 6-cylinder engine, special tools will be needed for the final installation of...

List of cylinder head gasket faults

Removal and installation the cylinder head
A torque wrench is required for the job. Next, you will need a long T55 multi-tooth socket wrench (for 4- and 5-cylinder engines) or external star key E14...

Removal and installation the engine
A description of engine removal for all engine types would be far beyond the scope of this book. Only some essential points on this topic are given here. The...

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100(C4, 1990-1994)

100(C4, 1990-1994, petrol)

100(C3, 1982-1990)

100(C3, 1982-1990, petrol)

100(C3, 1982-1990, diesel)