CHRYSLER SERVICE MANUAL
ENGINE—19
51x971D
Fig.
25—Testing Hydraulic Tappet (Typical)
h. Installation
Lubricate tappets. Install tappets (Fig. 26)
and push rods in their original bores. Position
rocker arm so it is partially seated on valve
stem. Install valve spring compressor tool and
compress valve spring until rocker arm can be
positioned over push rod. Remove tool and in-
stall tappet chamber cover. Install intake mani-
fold, carburetor and coil, refill cooling system,
start engine, warm up to normal operating tem-
perature.
16.
CHECKING VALVE TIMING
Turn crankshaft until Number one intake valve
is closed. Insert a .210 inch spacer between
rocker arm and stem of Number one intake
valve. (This can be done by prying between
rocker and valve spring seat with a large screw-
driver).
Install a dial indicator so that pointer con-
tacts valve spring seat as nearly at a right
angle as possible. Wait until seat stops moving.
This indicates that oil has bled out of hydraulic
tappet and plunger has bottomed, giving, in af-
fect, a solid tappet. Set dial indicator on zero
and turn crankshaft clockwise (normal running
direction) until dial indicator shows that valve
has lifted .020 inch (SpitFire) and .024 inch
(FirePower). The timing on the vibration dam-
per should now read from 5 degrees (BTDC)
before top dead center to 7 degrees (ATDC)
after top dead center. Before making this check,
it is well to check the accuracy of the (TDC)
top dead center mark on the damper by bring-
ing Number One piston to (TDC) by means of
an indicator placed in spark plug opening. Af-
ter valve timing has been checked, turn crank-
shaft counter-clockwise until tappet is back
down to valve-closed position. Remove the .210
inch spacer from between the rocker arm and
valve stem.
NOTE:
To prevent damage to valve mechanism,
the engine must not be run above fast idle un-
til all of hydraulic tappets have filled with oil
and become quiet.
x51A
CAUTION
Under no condition should crankshaft be turned
further in clockwise direction, as spacer might
cause valve spring to bottom and damage valve
operating mechanism.
17.
LOCATING LOW POINT OF CAMSHAFT IN
CONJUNCTION WITH VALVE TAPPET FACE
(CYLINDER HEAD INSTALLED)
Remove distributor cap, noting position of ro-
tor for Number One and Number Six cylinders.
Set timing mark ("DC") on vibration damper
to pointer. With rotor at Number One firing
position, the following tappets will be on low
side of cam lobe.
Fig.
26-lnstalling Tappet Assembly
2—Intake
2—Exhaust
4—Exhaust
7—Intake
8—Intake
8—Exhaust
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