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XLS .15A AIRCRAFT ENGINE TROUBLESHOOTING GUIDE

This troubleshooting guide has been provided to help you diagnose and solve most problems that you may encounter with your XLS 
series engine.  Most problems encountered can be solved by carefully following the problem-cause-solution sections below.  If you 
cannot solve the problem using this troubleshooting guide, please feel free to contact us using the information below.

WARRANTY INFORMATION

All Magnum engines returned for warranty service must be within the warranty terms as stated on the warranty card provided with your engine.  Do not return the engine 
to the place of purchase.  They are not authorized or equipped to perform warranty work on Magnum products.  When requesting warranty service, please observe the 
following guidelines:

  Always send the complete engine including the carburetor and muffler.  The engine must be removed from the model.

  Include a note detailing the problem or service you are requesting.  Service cannot be provided without this information.  Include your daytime phone number in the event 

we need more details pertaining to the service requested.

  You may request an estimate of services at the time you return your engine for service.  An omission of this request implies permission for the Magnum Service Center 

to service your engine at our discretion.

  Include a method of payment for any service charges.  If not specified, the unit will be returned to you C.O.D.

  Send the engine to us by United Parcel Service, Federal Express or by Insured Mail.  Postage is not refundable.  Send to:

Global Services  

 

 18480 Bandilier Circle  

  Fountain Valley, CA  92708

Phone (714) 963-0329  

 

 Fax (714) 964-6236  

  Email: service@globalhobby.com

1)  Engine does not start 

A)  Failed glow plug 

A)  Replace glow plug with new one

 

 

B)  Glow starter not charged and/or faulty 

B)  Fully charge glow starter and/or replace

 

 

C)  Engine not being turned over fast enough 

C)  Use an electric starter to start engine

 

 

D)  Low speed needle valve set too lean 

D)  Reset low speed needle valve to factory setting

 

 

E)  Old or contaminated fuel 

E)  Replace with new fuel

 

 

F)  Engine flooded with too much fuel 

F)  Remove glow plug and expel fuel from cylinder

 

 

G)  Faulty fuel tank and/or stopper assembly 

G)  Check and/or replace fuel tank assembly

 

 

H)  Air leak in fuel system and/or engine 

H)  Replace fuel lines and/or tighten all engine bolts

2)  Engine does not draw fuel 

A)  Air leak in fuel system and/or engine 

A)  Replace fuel lines and/or tighten all engine bolts

 

 

B)  High speed needle valve fully closed 

B)  Reset high speed needle valve to factory setting

 

 

C)  Low speed needle valve set too lean 

C)  Reset low speed needle valve to factory setting

 

 

D)  Fuel lines kinked 

D)  Check and straighten fuel lines

 

 

E)  Defective fuel tank 

E)  Replace fuel tank

3)  Engine vibrates excessively 

A)  Propeller out of balance 

A)  Balance propeller

 

 

B)  Engine and/or engine mount loose 

B)  Tighten engine mounting bolts

4)  Engine does not transition 

A)  Failed and/or wrong type glow plug 

A)  Replace with new recommended glow plug

 

 

B)  Old and/or wrong type fuel 

B)  Replace with new recommended fuel

 

 

C)  High speed needle valve set too rich 

C)  Set high speed needle valve to leaner setting

 

 

D)  Low speed needle valve set too lean 

D)  Set low speed needle valve richer

 

 

E)  Low speed needle valve set too rich 

E)  Set low speed needle valve leaner

 

 

F)  Air leak in fuel system and/or engine 

F)  Replace fuel lines and/or tighten all engine bolts

 

 

G)  Propeller too large 

G)  Replace with one size smaller propeller

5)  Throttle barrel does not 

A)  Throttle servo linkage out of adjustment 

A)  Adjust throttle linkage to close throttle barrel   

 

close completely 

 

 

 

completely

 
6)  Engine overheats 

A)  Engine running too lean 

A)  Richen high speed needle valve

 

 

B)  Cowl too restrictive 

B)  Open larger vents in cowling to allow air to exit

 

 

C)  Wrong type of fuel used 

C)  Use fuel with recommended oil content

 

 

D)  Engine not fully broken in 

D)  Allow engine further break-in time

7)  Engine stops abruptly 

A)  Engine running too lean 

A)  Richen high speed needle valve

 

 

B)  Piston and sleeve out of tolerances 

B)  Return engine to Global Services

 

 

C)  Engine Overheating 

C)  See # 6 above

PROBLEM 

CAUSE 

  SOLUTION

Summary of Contents for XLS .15A

Page 1: ...d behind the engine to make any adjustments to the needle valves Do not reach over or around the propeller Do not lean toward the engine Do not wear loose clothing or allow anything to be drawn into the spinning propeller while the engine is running If you need to carry your model while the engine is running be conscious of the spinning propeller Keep the airplane pointed away from you and others ...

Page 2: ...the front of the engine Using your thumb push down firmly on the carburetor so that the base of the carburetor sets completely into the crankcase An o ring is installed on the carburetor throat to seal the joint While holding the carburetor down firmly gently tighten the retaining nut to draw the pinch bolt into place WARNING Do not overtighten the retaining nut or damage to the base of the carbur...

Page 3: ...h lower flash point than Castor Oil lubricants Flash point is the point at which the lubricant begins to actually burn and lose its lubricating qualities Using fuels containing a blend of Castor Oil and synthetic lubricants results in an engine that runs cooler and lasts longer One lean run using a fuel containing only synthetic lubricants can cause engine failure Using fuels with a Castor Oil and...

Page 4: ...e lowering the amount of lubricant entering your engine Less lubricant means more chance of your engine overheating and possible engine failure Information about returning your engine for warranty service can be found on the separate sheets packaged with these Operating Instructions Magnum XLS series engines are distributed exclusively by Global Hobby Distributors 18480 Bandilier Circle Fountain V...

Page 5: ...d not be used as a replacement for the Operating Instructions included rather it should be used along with the Operating Instructions We highly recommend reading through the Operating Instructions to familiarize yourself with each part of the engine along with the proper procedures for engine break in and tuning Engine Mount Dave Brown 15 Size Engine Mount P N 218119 The Dave Brown engine mount is...

Page 6: ...le valve set too lean D Reset low speed needle valve to factory setting E Old or contaminated fuel E Replace with new fuel F Engine flooded with too much fuel F Remove glow plug and expel fuel from cylinder G Faulty fuel tank and or stopper assembly G Check and or replace fuel tank assembly H Air leak in fuel system and or engine H Replace fuel lines and or tighten all engine bolts 2 Engine does n...

Page 7: ...fler Axial Bolt Set M3x83mm 281721 12120K Muffler Bolts 2 M3x25mm 281798 S15860 High Speed Needle Valve Assembly Complete 281799 S15861 High Speed Needle Valve with O Ring 281901 12833 Needle Valve Detent Spring 281903 12847 Needle Valve Seat Gasket 282002 12819 Fuel Nipple with Fiber Gasket 282004 12114 Fuel Pressure Nipple 282102 12837G Rotor Bolt with Fiber Gasket 282130 46814A Carburetor Rotor...

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