Cub Cadet Challenger 550 User Manual

Engine
4‐10
Inspect
• Valve Sealing
(Look for leaks at the seat)
Pour a combustion chamber
cleaner into the intake track.
Check The intake side (1), there
should be no leakage at the valve
seat (2).
If leakage is found the valves and the
valve seats need to be ground and lapped.
Measure valve stem to valve guide
clearance.
Limit Intake0.12mm
Exhaust0.14mm
Measure the margin thickness.
Both Intake and Exhaust
0.85 – 1.15 mm
Measure valve stem run out
Run out Limit 0.01 mm
Whenever a valve is removed always
replace the valve guide seal.
If the valve needs to be replaced replace
the Valve guide as well.
Measure the valve spring free length
and squareness.
Valve spring free length Intake:
32.5mm Exhaust: 36.2mm Valve
spring squareness Intake: 0.10mm
Exhaust: 0.10mm
Measure the compressed spring force
Intake: 100.0 ~ 115.7 N at 27.5 mm
Exhaust: 120.6 ~ 138.3 N at 31.0 mm

Cub Cadet Challenger 550 Specifications

General

Brand	Cub Cadet
Model	Challenger 550
Category	Utility Vehicle
Language	English