911 Turbo AWD F6-3600cc 3.6L SOHC Twin Turbo (1997)
Lifter / Lash Adjuster: Testing and Inspection
Each time valve seats or valves are machined, the lift of the valve lifters must always be measured.
The following parts are needed for the test assembly:
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1 intake rocker arm
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1 exhaust rocker arm
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2 valve lifters (the valve lifters must be free from oil; clean them in petroleum spirit)
NOTE: These parts should only be used for checking valves and lifters and must therefore be appropriately marked and stored separately.
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Original rocker arm shafts
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Fastening screws
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Dial gauge mount (VW 387)
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Dial gauge
Measurement
1. Set piston to TDC, at which point the valves are closed. If the timing chain is not installed, turn the camshaft until the rocker arms are within the
circle of the cam.
2. Push rocker arm by hand and read valve lift of dial gauge.
The lift must be at least 0.2 mm on the intake rocker arm and 0.6 mm on the exhaust rocker arm.
If the valve lift measured is lower than the figure specified, a special, shorter replacement valve lifter must be installed.
Replacement valve lifters are available in 2 sizes:
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Size 1: 0.5 mm shorter
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Size 2: 1.0 mm shorter
CAUTION: The lift must not exceed:
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Intake Rocker Arm: 1.85 mm
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exhaust rocker arm: 2.25 mm