lock AUDI A4 1998 B5 / 1.G AFC Engine Lock Carrier Removing For Service User Guide

15-15

- Disconnect harness connectors for Heated
Oxygen Sensors (H02S) and oxygen sensor
heaters at engine compartment bulkhead, and
move to one side.

- Disconnect vacuum line to EGR vacuum
regulator solenoid valve at throttle body.

- Remove EGR valve from intake manifold.

- Remove hydraulic hose bracket and disconnect Ground (GND) wires
(arrow) on intake manifold.

Note:
The intake manifold has two slanting mounting surfaces to the left and - Remove bolts (arrows) and remove intake manifold.
- Seal off openings using clean cloth rags.
- Disconnect coolant line at rear of cylinder head.
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right cylinder heads. The cylinders heads can be warped by removing the
manifold. If only the intake manifold is removed, or if only one cylinder
head is removed, then the cylinder head bolts of the head(s) that are not
removed must be tightened 1/4-turn (90 ).
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15-16

- Remove heated oxygen sensors.

- Remove exhaust manifold heat shield.

- Remove cylinder head cover.

- Remove rear toothed-belt guard.

- Disconnect hose from hydraulic reservoir to
pump.

- Remove cylinder head.

Checking cylinder head distortion

- Measure with feeler gauge at several points using straight edge.
Max. permissible distortion: 0.05 mm (0.0020 in.)
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15-17

Installing

- Clean sealing surfaces.

- Install cylinder head gasket.

Lettering on gasket faces toward cylinder
head.

- Install cylinder head.

Pay attention to centering pins in cylinder
block.

- Install cylinder head bolts and tighten by hand.

Tightening

Note: - Tighten cylinder head bolts in two stages:

Stage 1 60 Nm (44 ft lb)
Stage 2 additional 1/2-turn (180 )
For final 1/2-turn, two 1/4-turns (90 ) are also permissible if tightening
with a fixed wrench. It is not necessary to retighten the cylinder head bolts after repairs, or
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as part of maintenance service.
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15-18

Compression pressure, checking


Engine warm-oil temperature at least 30 C
(86 F)

Throttle valve fully open during cranking

- Disconnect harness connectors from ignition coil
power output stage and from all six fuel
injectors.

- Use compression pressure recorder VAG 1381
together with adapter 1381/5 or equivalent to
measure compression.

Note:
Refer to operating instructions for use of the
recorder.

- Operate starter until tester shows no additional
increase in pressure.

Compression pressures
New: 9-14 bar (131-203 psi)
Wear limit: 7.5 bar (109 psi)
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Max. permissible pressure difference between
all cylinders: 3 bar (44 psi)

CAUTION!

If the test values are not within the
specifications, recheck compression
pressure after a test drive.
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15-19

Camshaft, removing and installing


Removing

- Removing ribbed drive belt page 13-9 .

- Remove toothed camshaft drive belt page 13
-
11
.

- Remove cylinder head cover.
_________________________________________________________
Left side:

- Remove housing for camshaft position sensor.
Right side:

- Remove plug/cover on cylinder head.
_________________________________________________________

- Remove toothed belt camshaft sprocket.

- Remove camshaft bearing caps -2- and -3-.
- Gradually and evenly loosen nuts for bearing caps -1- and -4-,
alternating in diagonal sequence.
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CAUTION!
DO NOT allow bearing caps to become mixed up. Identify as
necessary using a felt marker.
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15-20

Installing

Tightening torque: 17 Nm (15 ft lb)
CAUTION! - Install bearing caps -1- and -4-.
Gradually and evenly tighten bearing cap nuts, alternating in diagonal
sequence.
- Install bearing caps -2- and -3-.
After installing new or re-installing old lifters, and after installing
the camshaft(s), the engine must not be started for at least 30
minutes. Otherwise the valves could strike the pistons. After working on the valve train and lifters, crank the engine
carefully by hand, at least two full revolutions, to make sure that
the valves do not strike the pistons.
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