engine coolant AUDI A4 1997 B5 / 1.G AFC Engine Lock Carrier Removing For Service Workshop Manual

15-13

Cylinder head, removing and installing


Engine installed
This removal procedure refers to the left cylinder
head

Removing

- Remove ribbed belt page 13
-9

- Remove toothed belt page 13
-11

- Disconnect exhaust pipe from manifold.
- Disconnect components of EGR system, if applicable.

- Drain engine coolant at drain plug (arrow) using special tool 3247, and
at drain plug in bottom of radiator.
- Remove air hose between Mass Air Flow (MAF) sensor and intake
manifold.
- Disconnect all spark plug connectors.
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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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15-22

Hydraulic valve lifters, checking


Note:

Irregular valve noise during cranking is
normal.
Do not interchange hydraulic lifters. If
necessary mark them when they are being
removed.
Place lifters that have been removed on a clean
surface with the contact surface (camshaft end)
facing downward.
Hydraulic lifters cannot be repaired or adjusted.
Faulty lifters must be replaced.

- Start and run engine until warm-until radiator
coolant fan has come on at least once.

- Increase engine speed to approx. 2500 RPM for
2 minutes
If the irregular valve noise stops and then re-
occurs again each time vehicle is used in stop
and go traffic:

-
Replace the oil check valves Repair Group
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e=re
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