Motortech VARIFUEL2, Assembly Instructions Manual

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5 Installation Instructions
Rev. 09/2020 33
2. First, completely disassemble the flow body by unscrewing the self-locking nut and
disconnecting the two body halves .
3. To install the flow body, first slide the round half over the central nozzle ring on the air
inlet side . Note that the smallest flow body (ø 23 mm/0.9") cannot be put on the central
nozzle ring, but must be put in front of it.
4. On the mixture outlet side , put the second half of the flow body over the threaded rod
of the first half and the central nozzle ring .
5. Secure the threaded rod with the self-locking nut . Apply the adequate torque:
– Flow bodies made of aluminum: 5 Nm (3.7 lb-ft)
– Flow bodies made of thermoplastic material: 3 Nm (2.2 lb-ft)
5.2.2
Install VariFuel2/2+ into Intake Section
The mounting position of the VariFuel2/2+ gas mixer is arbitrary. For mounting, use the four
threaded holes and the flat surface on the bottom side of the device.
The following must be observed during installation:
– The VariFuel2/2+ must be mounted tension-free, i.e. all bores of the flanges must be aligned
with the housing bores.
– For the mixture outlet, consider the additional depth of the engine-specific mounting flange.
– With series 300 and 350, you can mount ring eyelets for lifting the VariFuel2/2+ into the
provided threaded holes, if necessary.
– For the air inlet, gas inlet and mixture outlet, use only galvanized hexagon bolts.
– Tighten the screws firmly enough so that all connections are gas-tight. Use a suitable torque
that matches the strength of the screw.
– Ensure that the inspection window on the fuel ring remains freely accessible and is for
example not covered by a pipe.
– Take care that the inspection window on the drive belt remains easily available for check-
ing and setting the belt tension.
– During installation, make sure that no loose parts get into the VariFuel2/2+.