Cylinder Head - Fiat 411 Rb Instruction Book

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CYLINDER HEAD
I Fig. 27. - Reference marks
' on timing sprockets.
Engine efficiency drops if valve seats are scored, pitted or burned,
preventing proper vaive seating. Should this trouble occur, remove
cylinder head and reface valve t R
sea s. eplace valves if necessary.
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Fig. 28. - Ignition timing reference marks.
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At the same time, decarbonize the compression chambers and piston
tops. 4
When reinstalling the cylinder head tighten to a 9 kgm (65,087 ft/tbs)
torque the hold-down nuts in criss-cross sequence, starting from
the center nuts.
lGNiTiON TIMING
No timing is required if the distributor is removed and reinstailed
without disturbing the crankshaft.
instead, if the crankshaft has been rotated ignition must be re-timed
as ioliows:
—- Check that distributor contacts gap is as specified (see page 36).
— Bring mark PMS 1-4 on flywheel to coincide with the reference
index (fig. 28A) or bring the notch on pulley edge in line with the
reference mark on cover (fig. 28B).
—-- Check which of the two cylinders, 1 or 4, is in the compression
stroke (both valves closed) and rotate the distributor rotor con-'
tact on the contact for firing in said cylinder. >'
- Next, insert the distributor in its seat. » .. "
-~ Before tightening the distributor locking nut (4, fig. 25) check
that contacts are about to part. r
Fig. 29. - Steering controi
A Tlttillfti mark on ilywlierzl - B. Thrill':-rj] mark on wiinlaslisrtl |7lr!|i-y, ' _ ,
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adjustment screw _
39