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5 Intake and Exhaust Valves
⇒ 5.1 Valve Guides, Checking, page 170 .
⇒ 5.2 Valves, Checking, page 170 .
⇒ 5.3 Valve Dimensions, page 170 .
5.1 Valve Guides, Checking
Special tools and workshop equipment required
♦ Dial Gauge Holder - VW387-
♦ Dial Gauge - 0-10mm - VAS6079-
Test Sequence
– Insert the valve into guide. Valve stem end must be flush with
the guide. Due to differences in valve stem diameter, make
sure that only intake valves are used to check intake valve
guides, and only exhaust valves are used to check exhaust
valve guides.
– Determine tip clearance.
Wear Limit
Intake Valve Guide Exhaust Valve Guide
0.80 mm 0.80 mm
Note
♦
If wear limit is exceeded, measure using new valves. Replace
the cylinder head if the wear limit is still exceeded.
♦
If the valve is replaced during a repair, use a new valve for
measurement.
5.2 Valves, Checking
– Check valves at stem and seating surface for traces of wear.
– If there are clear traces of wear, replace valve.
5.3 Valve Dimensions
Valve Dimensions
Note
Intake and exhaust valves must not be reworked. Only lapping is
permitted.
Dimension Intake Valve Exhaust Valve
Diameter
a
mm 33.85 ± 0.10 28.0 ± 0.1
Diameter
b
mm 5.98 ± 0.01 5.96 ± 0.01
c mm 104.0 ± 0.2 101.9 ± 0.2
α ∠° 45 45
Golf 2015 ➤ , Golf Variant 2015 ➤
Engine Mechanical, Fuel Injection and Ignition - Edition 04.2015
170 Rep. Gr.15 - Cylinder Head, Valvetrain
ProCarManuals.com
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