Series 4180 Powerhead12
6.1 Special Servicing Tools, Servicing Aids
– Pump – 0000 850 1300
– Nipple – 0000 855 9200
– Socket, T27x125 – 0812 542 2104
– Torque wrench – 5910 890 0302
– Screwdriver, T27x200 – 5910 890 2415
– Hook – 5910 893 8800
– OH 723 press fluid – 0781 957 9000
6.2 Testing the Tank Vent
Atmospheric pressure and internal fuel tank pressure
must be equal at all times for correct operation of the
carburetor. This is ensured by the tank vent.
In the case of problems with the carburetor or fuel supply
system, also check and clean or replace the tank vent.
Testing the fuel tank’s vent is performed by applying
pressure or vacuum via the fuel hose.
N Drain the fuel tank.
N Remove the shroud, @ 4.2.
N Remove filter and filter housing, @ 10.2.
N Pull hoses (1, 2) off the carburetor, @ 10.2.
N Push assembly drift 4237 893 4700 (16) into hose
(1).
N Push the nipple 0000 855 9200 (17) into the hose (2).
N Connect pump 0000 850 1300 (18) to nipple.
N Close the tank cap (8).
Vacuum Test
N Set the pump to vacuum mode.
N Create vacuum in the fuel tank.
Equalization of pressure takes place via the tank vent.
There must be no buildup of vacuum in the tank. If there
is a malfunction:
N Clean the area around the tank vent.
N Replace tank vent, @ 6.3.
6 Fuel Tank
8
9
6
7
3
4
2
3
1
13
12
10
5
11 D5x24 (6 Nm / 53 lbf. in.)
14
0000-GXX-1967-A0
Interactive video "Testing Tank Vent"
1
2
16
17
18
0000-GXX-1970-A0
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