G Step 43: Stop the engine and allow it to cool, check the
oil
and coolant levels and look for any leaks.
G Step 44: Avoid over-rewing or overloading the engine
during its settling down period of 600 miles. We recommend
an oil
and filter change at this mileage
-
this will help to
extend the life of your new engine.
Job 7. Petrol engine.
Valve clearances - adjustment.
0 INSIDE INFORMATION! Adjustment should always be
made with the engine cold. B
G Step 1: Remove the camshaft cover and the spark plugs.
Jack up a front wheel and engage top gear. Turning the wheel
will rotate the engine and therefore the camshaft. If the
engine
is
out of the car, use a socket and long lever on the
crankshaft pulley nut. If the cylinder head is detached, turn
the
camshaft belt sprocket, by hand.
G Step 2: The inlet and exhaust valves use different clear-
ances
which are checked when each cam lobe is pointing
directly away from its follower. See Chapter
3,
Facts and
Figures.
G Step 3: The order in which the valves are fitted in the
cylinder head is:
Inlet: 2-3-6-7
Exhaust: 1-4-5-8
from
the timing cover end.
G Step 4: Select a feeler blade which is about the thickness
of the
correct valve clearance and insert it between the heel of
the cam
and the cam follower shim when the cam lobe is
uppermost. If necessary, select different thicknesses of feeler
blade until a small amount of drag can be felt as the blade is
pushed in and out. Record the total blade thickness. This is the
valve clearance for this valve.
G Step 5: Rotate the camshaft and repeat this operation on
each
of the remaining seven valves, noting their respective
clearances. Those which have clearances within limits
obviously don't need any further attention.
Q Step 6: The remaining valves will now need to have their
shims (arrowed) changed for thicker or thinner ones, bringing
their clearances to within the specifications shown in Chapter
3, Facts and Figures
Ll Step 7: A special tool is needed to depress the cam
follower and allow extraction of the shim. This is available
from your FIAT dealer, or you will have to make a lever with a
fork that locates nicely on the rim of a cam follower allowing
removal of the shim by prising it from the follower.
• Step 8: The
thickness of a shim
is engraved on it in
mm (arrowed). If
this is worn away,
you will have to
measure the
thickness with a
metric micrometer
-
or have your FIAT
dealer do it for you.
Your FIAT dealer can
also supply any new
thickness of shim
you may require.
• Step 9: Where
a clearance is too
small with the thinnest shim in position, the valves should be
removed and the stem ground just sufficiently to make the
correction. Your FIAT dealer can do this, keeping the end
square and retaining a smooth finish.
fjfefe^ | Job 7-10
Q Step 10: Be sure to use a new gasket when the cover is
replaced.
