ULPOWER UL390i Maintenance Manual

Also see for UL390i: Operating manual Installation manual

Contents

ULPOWER UL390i Maintenance Manual Manual pdf 16 page image

Maintenance Manual ULPOWER UL390i UL390iS UL390iSAMM 390A01 Revision No: 2 Date: 2014-09-15 Page: 14 of 18Cylinder head bolts torqueAs cylinder head bolts normally don't need re-torqueing, checking torque is only a precautionarysafety measure. Therefore it is sufficient to only check the torque of the 4 cylinder head boltswhich are easily accessible. If re-torqueing should be necessary, then all bolts need checking. Inletmanifold, valve covers and plug ( n°6 parts catalogue ) shall have to be removed to access the 2other bolts on the cylinder head.Note: When checking torque, do not loosen first.Removal/change of spark plugsUnplug 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 neversand blast spark plugs! If you really want to clean spark plugs, usea plastic brush in a solvent.Spark plug consists of 3 electrodes round the core. Electrode gap cannotbe changed. Do not try to bend the electrodes!Note: Operation with leaded fuels (e.g. AVGAS 100LL) can result inincreased 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 disturbanceand possible consequential engine damage.Before inserting spark plugs back into cylinder head, apply appropriate anti-seize compound onthread. 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 adjustmentThe throttle lever stop (1) is factory set to a position that should correspond to a warm engine idlespeed of approx. 800 rpm. Attention: The idle speed of the engine should not be less than 700 rpm as rough turning couldcause 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 duringwarm-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 areswitched 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 runningapply throttle to the desired engine rpm. Setfriction to keep throttle in position and turn offengine. Loosen throttle lever stop screws (3) with a2.5mm Allan Key and move throttle lever stop (1)towards the left until it touches the throttle lever(2). Tighten throttle lever stop screws (3) tomaximum 3 Nm (2.25 ft lbs). If idle speed is too high, firstly verify if throttlelever (2) is completely against the throttle leverstop (1). If not, stops of aircraft throttle system are