Description
This article is from the VW
Technical FAQ, by with numerous contributions by Jan
Vandenbrande others.
21 Where are the timing marks on A1 & A2 VWs?
A: At the top of the clutch/bell housing you will find a plastic plug. Pulling
the plug allows you to use a magnetic factory sensor. If you want to use a
strobe, you will have to *unscrew* the whole plug assembly. Then you'll see
a reference mark, and an arrow somewhere on the flywheel:
Mark in hole: [ ]
^
flywheel: |
Normally the two have to line up under normal idle & a strobe connected to
cylinder #1. Some cars require certain vacuum hoses or the idle stabilizer
to be disconnected. Check manual.
Note: Some cars (e.g. 87 & 88 GTI 16V) also have marks on the front pulley,
with an arrow on the end of the block.
Note: Excessive advance raises combustion temperatures and pressures, while
excessive retard extends the burning cycle through the exhaust and raises
exhaust temps. (Mark Shaw)
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