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]
