Hatz 2-4L31 - Lubricating Oil Air-Cooled Engines

–
Preparations:
– On engines with enclosure, take off
the enclosure hood and side panel;
see M 35.00.
– On engines without enclosure, take off
the cooling air duct to the oil cooler.
Removing block-pattern oil cooler:
– Remove the oil line to the servo (only
on older version of the engine).
– Take out machine screws (196/1) and
detach the oil cooler.
Removing gilled-tube oil cooler:
– Take out machine screws (197/1) with
spring washers and detach oil cooler
with sealing rings (197/5).
– To dismantle the oil cooler: Pull the oil
guides (197/2) apart and take out both
gilled tubes (197/3) with O-ring seals
(197/4).
Note:
The gilled-tube oil cooler is only used on
two-cylinder engines without enclosure
and rated for engine speeds up to a
certain limit.
Checking parts:
– Make a visual check for cracks or
damage to the sealing faces.
– Clean the cooling surfaces.
Installing:
– Install the oil cooler by following the
appropriate removal instructions in the
reverse order.
Retrofitting engine with oil cooler:
– If an engine has an oil cooler retrofitted,
the missing threaded rod (198/3) must
be inserted and secured with sealant D.
Unless this work is performed, the oil
cooler will be unable to operate.
2
L / M . . 09.96
196
197
198
A 07.00 Lubricating oil
A 07.10 Oil cooler (air-cooled engines)
L3 / 189
1
L3 / 10
1
2
5
3
4
2
L3 / 190
3