Wren Turbines Ltd. MW54 Mk2 & Mk3 Turbo-Jet, kit assembly instructions, Jun 2004
Page 30
Wild rpm reading – interference to rpm pickup by electromagnetic device sited too close, find and move.
Engine slows or stops during
Air in fuel line – check tank system for air-leaks/fuel flow problem.
acceleration
Blocked intake filter screen (if fitted) – unblock.
Check TX setup – stick may not have been fully positioned on setup.
Engine slows in flight.
ECU battery discharged – recharge.
Tank vent blocked preventing fuel being supplied – unblock.
Clunk filter or fuel pipe blocked – unblock.
Engine stops in flight.
Low fuel, refuel.
Air in fuel system – check tank system for leaks or blockages.
Bad connection at pump, pump battery or ECU – check and solve.
Rpm or temp’ sensor faulty or bad connections – check and solve.
“Kill switch” operation insecure – replace.
RX interference causing ECU shutdown – find interference source and solve.
Excessive/unusual noise or
Engine out of balance due to poor balance or foreign object ingestion – investigate and replace
vibration.
damaged parts.
Maintenance.
As the engine has few consumable parts as such, beyond the bearings. We would not recommend taking it apart unless you need to do a visual
check on bearing wear (perhaps prompted by noises), which only involves the rotor assembly. Bearing wear is expected to be minimal and is likely
to be at its highest whenever the engine is reassembled and first run as the bearings have to settle back in onto their seating. For this reason it is
advised to not do this unless any unusual noises are noted in which case immediate investigation is required. Do however check the various screws
and fittings for tightness and note any apparent leaks. The O-ring seal at the front of the engine sometimes leaks a tiny bit in the area of the case
seam, this is not usually a problem and can be sealed with a wipe of silicon sealer.
If there are any fuel leaks, then these must be investigated immediately, and rectified. Do not fly with a known fuel leak – if a fuel pipe were to
come off under pressure neat fuel could be sprayed into the engine intake and could cause sudden over-speed of the engine with highly dangerous
consequences. Leaks at pipe connections are often cured by trimming the last 4mm of tube and re-fitting into the quick-release fitting. Check the
condition of your gas line regularly as this is connected to the hot part of the combustion chamber. Every time you rev the engine it pushes hot
gases down the feed line through the quick release connection. In time the tube gripper loosens off and the fitting must be replaced if it is possible
to easily pull the tube out. It is good practice to always trim the end of any tube which is removed from the connector and refitted, as a groove is
left from the gripper which impairs sealing if reused too often.
Summary of Contents for MW54 Mk2
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