Cub Cadet Challenger 550, Service Manual

Page: 246 / 255

Troubleshooting
8‐3
2. Cylinder head:
• Loose spark plug or damaged spark plughole.
• Damaged cylinder head gasket.
• Warped or cracked cylinder head.
• Damaged decompression assembly.
See Maintenance and Adjustment section for procedure.
Standard 135.14 Psi
Minimum 128.02 Psi
Maximum 142.25 Psi
Upon completion of these 3 tests you should know which system is in question and the
direction of further testing or repair.
Engine Overheating
(Cooling System)
Warning:
Do not remove the radiator cap, coolant drain plug or disconnect any coolant
hose immediately after or during engine operation. Scalding fluid and steam may
be blown out under pressure and cause serious injury. When the engine has been
operated, the coolant is very hot and under pressure. Attempting to remove these
items when the engine is hot can cause the coolant to spray violently from the
radiator, water pump or hose, causing severe burns and injury.
Check the following:
•
Low coolant level.
• Air in cooling system.
• Clogged radiator, hose or engine coolant passages.
• Worn or damaged radiator cap.
• Damaged water pump.
(Engine)
• Improper spark plug heat range.
• Low oil level.
•
Oil not circulating properly.
•
Valves leaking.
•
Heavy carbon deposits in the combustion chamber.
•
Dragging brake(s).
•
Slipping clutch.