76 lgnitiontiming, cylinder head bolts
Adjusting breaker points gap:
Loosen locking screw "a" slightly, insert
a screwdriver blade between the two
small pins "b" and into slot "c" on the
breaker poìnts plate, and turn slightly
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Tighten screw "a" firmly, and check that
the breaker points gap has not changed.
Checking ignition timing during a BMW
lnspection every 15000 km (10000 miles)
- always necessary after resetting the
points gap -should be performed. dyna-
mically with vacuum ignition control out
of action, using a strobe light and a revo-
lution counter.
Test englne speeds:
BMW 630 CS 1500 rev/min
BMW 633 Csi 1800 rev/min
The ignition timing mark "Z" (a pressed-
in steel ball, or on automatic transmis-
sion cars the longer taper pin at the side
of the starter gear ring) refers to the first
cylinder. lt can be seen by examining the
flywheel through the inspection hole in
the transmission housing on the left,
behind the starter.
Checking and adjusting ignition timing
should always be entrusted to an autho-
rized BMW §ervice station.
During the first BMW lnspection after
1000 km (approx.o 600 miles), and agajr.
during the 7500 km (5000 miles) BMW
Oil Service, the cyllnder head bolts
should be tightened in the specifieG
sequence while the engine is cold. Note
the correct tightening torque (see
"SPECIFICATIONS").
Take off the air cleaner.
Detach the rocker cover (10 mm cap nuts
and washers).
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