Car engine repair Audi 100 C4

Devices used in repairing the engine crank mechanism (CRM)
Traverse — for removing and installing the engine. To do this, hang a crossbar or a clamp on the hoist, grabbing the engine with hooks on the right side by the...

Tools used in repairing the timing mechanism
Portable (A) and stationary (B) device for mounting and dismounting engine valves Using one of the devices, compress the valve springs, remove the released...

Visual inspection of the engine
Inspect the engine from top to bottom. Ignore the slightly oily areas, all engines occasionally "spray" some lubricant. However, you should pay attention to...

Running in a new engine
The first 1000 km of mileage, rubbing engine parts (pistons and cylinders, plain bearings and shaft journals) are adjusted to each other. This should happen at...

Compression measurement
Measuring the compression in the engine cylinders will provide information on the quality of the valve and piston ring seals. This affects the power, cold...

Engine cranking
To perform many jobs, the engine must be installed in a certain position or turned. To do this, with the car on a level surface, engage maximum gear and push...

Removal and installation the cylinder head
Attention. Before removing or installing the cylinder head, align the timing marks with the piston of cylinder No.1 in the top dead center (TDC) position. Turn...

Cylinder Head Gasket Fault Diagnosis

Distinctive features of installation of cylinder head gasket of diesel engine
When replacing the cylinder head gasket, it is necessary to pay attention to its marking and replace it only with a gasket with the same marking. Cylinder head...

Repair of the cylinder head with 2 valves per cylinder
1 Lid gasket 2 Oil change hole 3 Cylinder head cover 4 Reinforcement bar 5 Oil deflector plate 6 Cylinder head bolt 7 Nut, 10 Nm 8 Generator bracket 9 Cylinder...

Checking the cylinder head components
Valve springs A special device is required to check the valve springs correctly, although the exact lengths of the "stressed" springs are unknown. When using...

Repair of cylinder head with five or four valves per cylinder
Disassembling the cylinder head The camshafts can be removed and installed on an installed engine by performing some preliminary operations. To pre-tension the...

Replacing the camshaft seal
The camshaft seal may be replaced on an installed engine if leaks are found near this location. The seal is located behind the camshaft drive gear. You will...

Hydraulic tappets
A little should be said about hydraulic tappets, as improper handling can damage the engine. Hydraulic tappets are installed on all types of engines. When...

Removal and installation the front timing belt cover
4-cylinder engine Top cover Disconnect the wire from the negative battery terminal. Loosen the generator adjusting bolts, turn the generator upward and tighten...

Checking the timing belt tension
4-cylinder engine Toothed belt of a 4-cylinder engine 1 Toothed belt 2 Timing belt cover 3 Wire belt. 4 Timing belt sprocket 5 Crankshaft gear 6 Crankshaft oil...

Replacing the timing belt and cylinder engine
Removal Disconnect the wire from the negative battery terminal. Using the large bolt on the crankshaft sprocket, turn the shaft so that the piston of cylinder...

Replacing the timing belt of a 4-cylinder engine with five valves per cylinder
Removal Remove the front engine parts and do the following: Remove all accessory drive belts. Remove the upper timing belt cover. Using a felt-tip pen, mark...

Replacing the timing belt of a 6-cylinder engine
Removal Raise the car on a lift. Remove the lower engine compartment cover. After removing the V-belt, unscrew the mounting bolts and remove the V-belt...

Removal and installation gear wheels
The toothed wheels of the belts are fixed with keys on the corresponding shafts. Each sprocket is fixed with a bolt. To remove any or all of them, you must...

Tensioning and replacing toothed belts of a 5-cylinder diesel engine
Elements of the toothed belt transmission of a 5-cylinder engine (camshaft drive) 1 Toothed belt 2 Camshaft gear 3 Tension roller 4 Rear timing belt cover 5...

Engine overhaul
The term major engine overhaul refers to repairs that can only be carried out after removing the engine from the vehicle. Warning. Disconnecting the negative...

Removal and installation of a 4-cylinder engine
Removal Mark the location of the hood and hinges and remove the hood. Relieve the fuel pressure. Disconnect the wire from the negative battery terminal. Remove...

Removal and installation of 5-cylinder turbocharged engines
Removal Caution: Mark all wires and hoses when removing to facilitate subsequent reassembly. Disconnect the wire from the negative battery terminal. Relieve...

Removal and installation of 5-cylinder engines without turbocharging
Removal Disconnect the wire from the negative battery terminal. Relieve the fuel pressure. Drain the coolant. Disconnect the radiator and heater hoses from the...

Connecting rod and piston group
Piston and connecting rod assembly diagram 1 Piston ring 2 Piston pin retaining ring 3 Piston pin 4 Piston 5 Connecting rod 6 Connecting rod bolt 7 Cylinder...

Cylinder block
In case of complete disassembly, the cylinder block should be thoroughly cleaned and all foreign bodies should be removed from the holes and oil channels....

Crankshaft and crankshaft bearings
Crankshafts vary between engine types because they have different piston strokes. If a partial engine is installed, it comes with a needle bearing for the...

Crankshaft seals
The front and rear crankshaft oil seals must be replaced whenever the crankshaft or oil seal flange is removed. This requires special precautions and special...

Flywheel (manual transmission)
As already mentioned, a conventional or dual flywheel can be installed (dual mass flywheel). To disconnect the flywheel, hold it in a suitable manner by the...

Intermediate shaft
Intermediate shaft parts 1 Bolt, tightening torque 80 Nm 2 Washer 3 Reception gear 4 Seal 5 Seal flange 6 O-ring seal 7 Key 8 Intermediate shaft 9 Bolt, 25 Nm...

Cylinder head of a 4-cylinder engine
1 Cylinder head cover 2 Gasket 3 Bearing caps 4 Camshaft 5 Cylinder head 6 Valves 6a Inlet valve 6b Exhaust valve 7 Cylinder head gasket 8 Segment key

Lubrication system of a 6-cylinder gasoline engine
1 Bolt 2 Bolt 3 Oil pan, upper part 4 Oil pan, lower part 5 Bolt 6 Nut 7 Bolt 8 Drain plug

Lubrication system of a 4-cylinder engine
1 Oil filler cap 2 Gasket 3 Oil dipstick 4 Oil pressure indicator sensor 5 Oil filter 6 Bolt 7 Gasket 8 Gears 9 Suction filter 10 Perforated plate 11 Oil sump...

4-cylinder engine
1 Oil filler neck 2 Camshaft drive gear 3 Timing belt cover 4 Timing belt tensioner 5 Toothed belt 6 V-belt 7 Intermediate shaft gear 8 Crankshaft pulley 9...

Flat gear transmission of a 6-cylinder gasoline engine
1 Bolts 2 Tension roller 3 Toothed belt 4 Timing belt cover 5 Bolt 6 Bolt

V-belt and flat-tooth transmission of a 5-cylinder gasoline engine
1 Upper timing belt cover 2 Nut 3 Toothed belt 4 Bolt 5 Camshaft gear wheel. 6 Rear toothed belt shield 7 Spacers 8 Bolt 9 Bolt 10 Bolt 11 Generator drive...

V-belt and flat-tooth transmission of a 4-cylinder gasoline engine
1 Bolt 2 Lower timing belt cover 3 Upper timing belt cover 4 Bracket 5 Bolt 6 Timing belt tensioner with temperature control 7 Nut 8 Tension roller 9 Toothed...

Cylinder head of a 6-cylinder engine
1 Bolt 2 Suction manifold 3 Bolt 4 Lid 5 Bolt 6 Cylinder head mounting bolt 7 Oil pressure sensor, 25 Nm 8 Oil pressure switch, 25 Nm 9 Screw 10 Bolt 11 Bolt...

Gear and drive belt of a 4-cylinder engine
1 Rear drive belt cover 2 Intermediate shaft gear 3 Crankshaft gear 4 Drive belt 5 Tensioner 6 Upper drive belt cover 7 Lower drive belt cover 8 Cork 9 Belt 10...

Gear and drive belt of a 5-cylinder petrol engine
1 Upper timing belt cover 2 Nut, 10 Nm 3 Toothed belt 4 Bolt, 80 Nm 5 Camshaft gear wheel 6 Rear toothed belt shield 7 Distance bushings 8 Bolt, 20 Nm 9 Bolt,...

Five-cylinder engine with fuel injection
1 Inlet pipe 2 Camshaft 3 Camshaft drive gear 4 Valve tappet 5 Valve 6 Piston 7 Crankshaft pulley with vibration damper 8 Crankshaft gear 9 Oil pump 10 Oil...

Lubrication system of a 5-cylinder petrol engine
1 Oil level indicator 2 Gasket (replace) 3 Oil pressure sensor 0.3 bar, 26 Nm 4 Oil pressure sensor 0.3 bar, 25 Nm 5 Suction pipe 6 Oil receiver 7 Oil pan 8...

Rear suspension strut
1 Wheel arch 2 Combination bolt, 55 Nm 3 Protective cover 4 Rear pillar 5 Spacer washer 6 Bolt, 240 Nm 7 Self-locking nut (replace) 8 Axle housing

Drive shaft and front suspension strut
1 Protective cover 2 Self-locking nut 3 Thrust plate 4 Front pillar 5 Sealing 6 Drive shaft 7 Spacer strip 8 Screw: M8: 45 Nm; M10: 80 Nm 9 Self-locking nut,...

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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)