MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
260
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 5-7-20 Installing the timing system
Fig. 5-7-21 Installing the timing pulley
fuel pipe from deforming and being damaged.
Installing the timing system
②
(1) Install the woodruff key to the exhaust camshaft,
install the timing pulley to the exhaust camshaft and
tighten the fastening bolt washer component to the
required torque. The camshaft timing pulley should be
pressed and installed to the right position without
deflection.
(2) Adjust the mark position of the scribed line on the
camshaft timing pulley till this position aligns with the
junction seam (on the exhaust side) which is between
the cylinder head and the camshaft bearing cap. See
Fig. 5-7-18.
Tightening torque for bolt washer component of
camshaft timing pulley
110N·
m±5N·
m
(3) Align the timing marks on damping pulley and timing
hood II. See Fig. 5-7-19.
(4) Align the timing mark on the fuel pump pulley to the
horizontal bar on the water pump housing. See Fig.
5-7-20.
(5) Install the timing belt. During the installation, make
sure the belts, except the timing tension pulley, are
connected with the pulley firmly without any looseness.
See Fig. 5-7-21.
(6) Install the timing tension pulley. Fix the limit bracket
of the timing tension pulley in the place where the bowl
shaped plug is installed on the cylinder head, and then
use a hexagon socket head spanner to turn the
pinhole-mounting position clockwise until it is slightly
over 30° past the vertical direction and the tension
pulley arm indicator is 1°~2° past the lower verge of the
installation arm notch, and tighten the fastening bolts.
After removing the hexagon socket head spanner, the
mounting dowel pin of camshaft pulley and the
crankshaft locking tooling, turn the camshaft for two
circles clockwise with a spanner to make sure that the
damping pulley, camshaft timing pulley and fuel pump
pulley center the corresponding installation timing
marks and the belts mesh perfectly. If there is any pulley
that is not aligned properly, loosen the fasting bolt of
timing pulley and install them again to align the pulley
properly. So that one cylinder is just at the top dead
center of the compression stroke, and the valve timing
is accurate. See Fig. 5-7-22.
Fuel pump pulley
Timing
mark
Horizontal
bar
Timing pulley
Timing
tension
pulley
