Maintenance Manual
UL
POWER
UL390i UL390i
S
UL390i
SA
MM 390A01 Revision No: 2
Date:
2014-09-15
Page:
14
of
18
Cylinder head bolts torque
As cylinder head bolts normally don't need re-torqueing, checking torque is only a precautionary
safety measure. Therefore it is sufficient to only check the torque of the 4 cylinder head bolts
which are easily accessible. If re-torqueing should be necessary, then all bolts need checking. Inlet
manifold, valve covers and plug ( n°6 parts catalogue ) shall have to be removed to access the 2
other bolts on the cylinder head.
Note:
When checking torque, do not loosen first.
Removal/change of spark plugs
Unplug ignition leads and unscrew spark plugs with 16mm Plug Socket.
Note:
As in any modern automobile, sparkplugs do normally not need cleaning.
Certainly do not use steel or brass brushes for cleaning and never
sand blast spark plugs! If you really want to clean spark plugs, use
a plastic brush in a solvent.
Spark plug consists of 3 electrodes round the core. Electrode gap cannot
be changed. Do not try to bend the electrodes!
Note:
Operation with leaded fuels (e.g. AVGAS 100LL) can result in
increased wear of the spark plugs. Reduce renewal intervals accordingly.
At replacement only use spark plug type
: Bosch FR 5 DTC
Attention
:
Use of incorrect spark plugs may result in ignition problems or electrical disturbance
and possible consequential engine damage.
Before inserting spark plugs back into cylinder head, apply appropriate anti-seize compound on
thread. Screw in spark plugs with fingers to seat; only then use Plug Socket to tighten to 21 Nm.
Place back ignition leads; make sure spark plug connectors are secure.
Idle speed adjustment
The throttle lever stop (1) is factory set to a position that should correspond to a warm engine idle
speed of approx. 800 rpm.
Attention
:
The idle speed of the engine should not be less than 700 rpm as rough turning could
cause damage to the engine. We recommend a minimum of at least 800 rpm.
With a cold engine, user should apply a little throttle so idle speed is at least 1000 rpm during
warm-up. Only when engine is at operating temperature, minimum idle speed can be tested/set.
WARNING:
Adjusting idle speed should always be done while engine and master switch are
switched off.
WARNING:
Take great care when adjusting throttle lever stop as the engine will be hot.
If the warm idle speed of the engine is unsatisfactory, adjust as follows:
If idle speed is too low: while engine is running
apply throttle to the desired engine rpm. Set
friction to keep throttle in position and turn off
engine. Loosen throttle lever stop screws (3) with a
2.5mm Allan Key and move throttle lever stop (1)
towards the left until it touches the throttle lever
(2). Tighten throttle lever stop screws (3) to
maximum 3 Nm (2.25 ft lbs).
If idle speed is too high, firstly verify if throttle
lever (2) is completely against the throttle lever
stop (1). If not, stops of aircraft throttle system are
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