Fiat 411 Rb Instruction Book page 22

SERVICE HINTS
eon 'THE SPECIALIZED SHOPS
VALVE-TO-ROCKER CLEARANCE AEJdUSTlVlENT
To adjust vaive tappet clearance (operation to be performed when
the engine becomes noisy or overheats) reinove the head cover and
check clearance by a feeler gauge: specified clearance is 0,15 mm
(.0O59") both for intake and exhaust.
IGNITION DISTRIBUTOR CONTACTS ADJUSTMENT
Maximum contacts gap should be 0,42 to 0,48 mm (.O17" to .019").
For gap adjustment: slacken screw 6 (fig. 25), move as required the
contact carrier plate and reiock in place.
it on inspection (to be
carried out every 300
working hours) con-
tacts are found dirty,
clean with a cioth
moistened in gasoline;
if contacts are uneven-
ly worn or charred, triin
with a fine cut file.
/..._\ _
Fig. 25. ~ ignition distributor.
't. (fJ<>iiliii.i:s (ciirruiit lo iiiiiililt
piugirjs).
2. Rotor.
3. i.ubrir;aloi'.
4. Distributor lOC2iiiii(] screw nut.
5. Contacts.
6. Stationary contact plate
screw.
36
Fig. 26. - idle speed adii.ist-
ment screws on carburetor.
1. 'l'lirnllle opening; adjusting
screw.
2. lulu sponrl iiiixliiro .1-lditifiiiiiij
'i(Il'E?\N.
IDLING SPEED ADJUSTMENT
if at idle speed the engine runs irregularly and tends to stop, adjust
carburetlon (fig. 26) with engine running and warm:
-~~ first, set throttie to minimum opening by setscrew 1 so as to insure
steady operation;
~~ next, by turning screw 2 in or out set mixture richness to the most
suitable ratio for said throttle opening, thus accompiishing a fast
and steady idiing;
—s reduce minimum throttle opening some more by screw 1 until
best idling speed rate is obtained.
VALVE GEAR TIMING
If the chain coupling the camshaft to crankshaft has been removed,
before reinstallation make sure the sprockets are set with timing
marks in line, as shown in fig. 27.
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