SkyTrak 6036 Service Manual - Manual (Page 109)

Section 8A Perkins Engine
Model 6036/6036T S/N 9B0500 thru 14833 8A-17
8A.13.4 Fuel Pre-Filter
Drain water from fuel pre-filter, Fig. 8A.26 and
8A.27, every 250 hours of operation.
1. Unlock and open the right rear engine access
door.
2. Loosen drain cock (6, Fig. 8A.27) on under-
side of fuel pre-filter and drain water into a
glass until clear fuel is visible.
3. Tighten drain cock after draining.
4. Close and lock access door.
a. Removal
1. Remove fuel pre-filter inlet and outlet tubes,
Fig. 8A.26.
2. Support filter with one hand and remove lock
nuts (15) and capscrews (14) and remove fuel
pre-filter from mounting bar.
b. Disassembly
Loosen the hex head screw in the top of the filter
and separate the filter base from the filter head.
c. Cleaning and Drying
Clean the pre-filter using an approved solvent and
dry with a clean, lint-free cloth.
d. Assembly
Assemble filter base to filter head using hex head
screw.
e. Installation
1. Hold filter in position and install capscrews
(14) and lock nuts (15) to secure filter to
mounting bar.
2. Reconnect inlet and outlet tubes.
8A.13.5 Fuel Lift Pump
Clean fuel lift pump sediment chamber, Fig. 8A.28,
every 500 hours of operation.
1. Unlock and open the left rear engine access
door.
2. Remove fuel lift pump cover screw, cover
washer, cover, and strainer (Fig. 8A.12).
3. Wash any sediment from lift pump and clean
cover and strainer.
4. Install strainer and cover making sure that
cover seats on pump with NO leakage.
5. Remove air from the fuel system (see para-
graph 8A.7.3, How to Bleed to Fuel System).
6. Close and lock access door.
a. How to Test Fuel Lift Pump in Position
To test the diaphragm, block the fuel inlet line with
your finger and operate the priming lever. A good
pump will have suction that will not bleed down
until you remove your finger from the inlet.
To test pump performance:
1. Disconnect the outlet line from the fuel lift
pump to the fuel filter.
2. Rotate the engine. There should be a spurt of
fuel from the outlet port once every two
revolutions.
b. Check Pressure with Pump in Position
1. Fit a 0 to 10 psi (0 to 0,69 bar) pressure gauge
to the outlet of the pump. Ensure that there
are no leaks at the connections between pump
and gauge.
2. Crank the engine for 10 seconds and note the
maximum pressure on gauge. If the pressure
recorded is less than 75 percent of minimum
production static pressure which is 4.5 psi
(0,31 kgf/cm
2 or 31 kN/m 2 ), then replace the
pump.
NOTE: Minimum production static pressure is
6 psi (0,42 kgf/cm
2 or 41 kN/m 2 ).
Also observe the rate at which the pressure
drops to half the maximum figure obtained
when cranking has ceased. If less than 30
seconds, replace the pump.
NOTE: These figures apply to a 4-bolt-type fuel lift
pump. If your engine has a 2-bolt-type fuel lift
pump, contact your Engine Distributor for pump
pressure specifications.
PRIMING LEVER
OA0332
FUEL LIFT PUMP
Fig. 8A.28 Typical Fuel Lift Pump