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(including the primary fuel filter) is changed, there can be air in the fuel system. It is required to prime the fuel system
as per following steps:
Caution: Priming the fuel system is required if air enters the fuel pipeline due to untimely fuel supplement
or there is air in the fuel system due to other reasons.
4.3.16 Draining water in primary fuel filter
4.3.17 Checking intercooler and its lines
Perform visual check on the air inlet and outlet chambers of the intercooler for crack, perforation or other damages,
and of the air inlet and outlet pipes for sealing-off and other damages. Replace the intercooler if necessary.
Perform visual check on the hoses of air inlet and outlet pipes and water inlet and outlet pipes (water-to-air cooler) for
crack and check the clamps for looseness. Replace the hose(s) if any fault is found, and tighten clamp screws if
looseness is found.
4.3.18 Checking and adjusting valve clearance
When doing the first maintenance for a new or overhauled engine, conduct valve-clearance checking to timely
regulate and correct the initial changes of the valve clearances. Later valve clearance checking and regulating should
be based on the maintenance plan if the engine operates normally.
Valve clearance checking should be conducted after the engine has been stopped and the coolant temperature falls
to below 60 .ć
(1) Unscrew the valve cover bolts and remove the cover.
(1) Loosen the bolt of the fuel return pipe.
(2) Prime the priming pump until there is no bubble visible
in the fuel that outflows from the bolt.
(3) Tighten the bolt.
The primary fuel filter has a function of water and fuel
separation. When water level in the water container of the
filter reaches a certain level, the water-level sensor will
send a signal to the water-level indicator light, reminding
the driver to drain the water timely. Loosen the water drain
valve about three and half turn to drain the water and
sediment until clean fuel outflows. Then tighten the valve
until you feel suitable. Don’t over-tighten it.
Water drain valve
Priming pump
Bolt
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