48 Minordefects
3. lf the brightness of the headlights does
not diminish, consult your BMW ser-
vice station (a fault in the starter is
indicated).
Engine will not start although starler
motor is tuming:
Provided that the instructions for starting
were observed, and there is enough fuel
in the tank, the fault may lie in the igni-
tion system or the fuel supply system.
1. Check that the plug leads are firmly
attached to the spark plugs. Check the
tightness of all cables on the coil,
distributor and other terminals, and
ensure that the fault is not due to
water that got into the engine com-
partment du ring a car wa§h.
2. Check spark plug gaps and general
appearance.
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metal body of the plug on an unpainted
part of the engine block. When the
starter i§ operated, sparks should be
seen ju mping the electrode gap.
If no spark is visible, attach a different
plug to the same lead and repeat the
test. lf no spark occurs this time, the
ignition distributor must be examined.
BMW 630 CS
4. To check that fuel is réaching the en-
gine, separate the fuel supply line from
the carburetor and operate the star[er.
lf no fuel emerges from the supply
line, the fuel line and the fuel pump
must be examined.
On the other hand, if fuel is pumped
through to the carburetor, unscrew
the carburetor jets (see pages 69 and
70) one after the other and clean them.
This work is best entrusted to a BMW
servicestation.
BMW 633 Csi
5.Check that fuel is delivered to the
system at starting speed. This is done
by unscrewing both hexagon nuts (10
mm wrench) at the valve flange,
removing the ' starting valve and
operating the starter motor briefly.
Fuel should be sprayed out. Warnlng:
risk of fire.
Then install the starting valve again
and tighten the nuts carefully
lf the engine is warm, perform the
same test by detaching the fuel hose at
the starting valve, since this valve
delivers fuel only up to 45°C (ii3°F).
lf, on the other hand, no fuel is sup-
plied to the system, checl( that the
corresponding fuse has not blown. lf
the fuse is intact, consult a BMW
servicestation.
lf the tank is run dry, there is no need to
bleed the fuel injection system, as this
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ated.
Coolant temperature too high :
1.Allow the engine to cool until the
coolant thermometer needle is within
the white marks. Carefully remove the
radiator cap and check coolant level.
Never add water to the system il the
engine is hot, after having lost a large
quantity of coolant. Allow the eng ine to
cool until a hand can be placed on the
block.
2. lf coolant is lost, check the radiator
cap, all hose connections and the
radiator for leaks.
3. Check V-belt condition and tension;
adj ust or renew as requ i red.
4. Check ignition timing.
5. lf necessary, have the complete cool-
ing system flushed out by your BMW
service station.
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