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XL .52RFS AIRCRAFT ENGINE TROUBLESHOOTING GUIDE

This troubleshooting guide has been provided to help you diagnose and solve most problems that you may encounter with your XL RFS 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.

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

 

 

I)  Valves out of adjustment 

I)  Readjust valves to correct gap

 

 

J)  Engine timing incorrect 

J)  Adjust camshaft to correct setting 

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)  Use propeller within the recommended size range

 

 

H)  Valves out of adjustment 

H)  Readjust valves to correct gap

5)  Throttle barrel does not 

A)  Throttle servo linkage out of adjustment 

A)  Adjust throttle linkage to close throttle barrel   

 

close completely 

 

 

 

completely

 

 

B)  Idle stop screw out of adjustment 

B)  Turn idle stop screw counter-clockwise until throttle  

 

 

 

 

 

barrel closes fully

 

 

C)  Low speed needle valve set too lean 

C)  Set low speed needle valve richer

 

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 and type

 

 

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 ring and sleeve out of tolerances 

B)  Return engine to Global Services

 

 

C)  Engine overheating 

C)  See # 6 above

 

 

D)  Low speed needle valve set too lean 

D)  Set low speed needle valve richer

 

 

E)  Failed glow plug 

E)  Replace glow plug with new one

 

 

F)  Fuel tank empty 

F)  Refill fuel tank

8)  Engine lacks power 

A)  High speed needle valve set too rich 

A)  Set high speed needle valve to a leaner setting

 

 

B)  High speed needle valve set too lean 

B)  Set high speed needle valve to a richer setting

 

 

C)  Engine overheating 

C)  See # 6 above

 

 

D)  Valves out of adjustment 

D)  Readjust valves to correct gap

 

 

E)  Propeller too large 

E)  Use propeller within the recommended size range

 

 

F)  Piston ring and sleeve out of tolerances 

F)  Return engine to Global Services

PRoBlEM 

cAUSE 

  SolUTIon

For product warranty inFormation, please reFer to the warranty card provided with your engine.

Global Services

18480 Bandilier Circle

Fountain Valley, CA  92708

Phone (714) 963-0329

Fax (714) 964-6236

Email: [email protected]

Summary of Contents for XL .52RFS

Page 1: ...he engine is running l If you need to carry your model while the engine is running be conscious of the spinning propeller Keep the aircraft pointed away from you and others at all times l Do not use a tight fitting cowl over the engine It can restrict air from flowing over the engine which could result in engine damage from overheating For proper cooling the total cowl air exit area should be 30 g...

Page 2: ...during flight Idle Stop Screw and Rotor Bolt The idle stop screw adjusts the closure of the throttle barrel idle speed We recommend adjusting the idle stop screw to allow the throttle barrel to close completely This will allow you to adjust the idle speed via your transmitter therefore you will need to set up your transmitter throttle trim lever to keep the engine at a low idle when the trim lever...

Page 3: ...ckwise direction When using an electric starter it is not necessary to prime the engine The starter turns the engine over fast enough that the engine draws fuel on its own Priming the engine prior to using an electric starter can cause the engine to hydro lock flood Turning the engine over with an electric starter while the engine is flooded can cause extreme damage to the engine and or cause the ...

Page 4: ...etween a 200 300 rpm drop q 3 With the engine running at full power carefully lift the nose of the aircraft about 45º into the air The mixture should not become too lean but you may hear a slight increase in rpm If the engine sags or loses rpm when you hold the nose up the mixture is too lean If this is the case slightly richen the mixture and follow the test once more IMPORTANT Rpm will increase ...

Page 5: ...underbolt HP Glow Plug Product Number 115480 The Thunderbolt HP glow plug is designed specifically for four stroke engines and produces low idle speeds smooth transition and cooler running temperatures The glow plug is also very durable and able to withstand repeated use day after day Propeller APC 12 x 6 Propeller Product Number LP12060 We have found that XL RFS series engines run best using APC ...

Page 6: ...e 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 Use propeller within the recommended size range H Valves out of ad...

Page 7: ...0 80841 Lock Washers 2 M3 281166 12862 Needle Valve Seat Assembly 281174 80719 Rocker Arm Retaining Bolt M3 x 16mm 281210 52111 Backplate Gasket 281307 52134 Carburetor Retaining Bolts M2 5 x 20mm 281308 12518 Intake Pipe Camshaft Cover Bolts M2 5 x 8mm 281403 12109 Camshaft Ball Bearing 281417 52109 Front Ball Bearing 281418 52110 Rear Ball Bearing 281507 160120 Cylinder Head Bolts M3 x 18mm 2815...

Page 8: ...ard the front of the engine of the 6 o clock position q 4 Reinstall the camshaft housing cover RESETTING THE TIMING MAINTENANCE Engine maintenance should be done on a regular basis to ensure that you keep the engine running in top form especially over time Following these simple maintenance practices will ensure the long life and dependability you expect from your engine l Avoid running the engine...

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