Ariens 939 SNO-THRO 939001 Service Manual page 23

PROBLEM
Excessive Fuel
Consumption
High Oil Pressure
Knocking
Loss of Power or System
Low Cranking Power
Low Oil Pressure
Misfiring
Overheating
ENGINE TROUBLESHOOTING
PROBABLE CAUSE
Restriction in air cleaner
Poor compression
Incorrect grade of fuel
Sticking throttle/restricted movement
Leaking cylinder head gasket
Worn oil pump
Worn cylinder bores
Pitted valve stems and seats
Broken, worn, or sticking piston rings
Incorrect grade of lubricating oil
Pressure relief valve sticking closed
Incorrect grade of fuel
Overheating
Sticking valves
Worn cylinder bores
Broken, worn, or sticking piston rings
Worn or damaged bearings
Incorrect piston height
Broken valve spring
Restriction in air cleaner
Blocked fuel feed line
Choked fuel filter
Poor compression
Blocked fuel tank vent
Incorrect grade of fuel
Sticking throttle/restricted movement
Leaking cylinder head gasket
Overheating
Worn cylinder bores
Pitted valve stems and seats
Broken, worn, or sticking piston rings
Bad electrical connection
Faulty starter motor (if applicable)
Incorrect grade of lubricating oil
Incorrect grade of lubricating oil
Worn or damaged bearings
Insufficient oil in sump
Oil pump worn
Choked fuel filter
Poor compression
Leaking cylinder head gasket
Overheating
Incorrect tappet adjustment
Sticking valves
Pitted valves and seats
Restriction in air cleaner
Incorrect valve timing
Leaking cylinder head gasket
Remove obstruction
Repair per instructions in manufacturer's manual
Use fuel recommended in manufacturer's manual
Lubricate or replace
Repair per instructions in manufacturer's manual
Repair per instructions in manufacturer's manual
Repair per instructions in manufacturer's manual
Repair per instructions in manufacturer's manual
Repair per instructions in manufacturer's manual
Use oil recommended in manufacturer's manual
Repair or replace spring
Use fuel recommended in manufacturer's manual
Allow to cool; determine cause
Repair per instructions in manufacturer's manual
Repair per instructions in manufacturer's manual
Repair per instructions in manufacturer's manual
Repair per instructions in manufacturer's manual
Adjust per instructions in manufacturer's manual
Replace per instructions in manufacturer's manual
Remove obstruction
Remove obstruction
Remove obstruction
Repair per instructions in manufacturer's manual
Remove obstruction
Use fuel recommended in manufacturer's manual
Lubricate or replace
Replace per instructions in manufacturer's manual
Allow to cool; determine cause
Repair per instructions in manufacturer's manual
Repair per instructions in manufacturer's manual
Repair per instructions in manufacturer's manual
Check connections to electric start (if applicable)
Replace per instructions in manufacturer's manual
Use oil recommended in manufacturer's manual
Use oil recommended in manufacturer's manual
Replace per instructions in manufacturer's manual
Refill with oil
Replace per instructions in manufacturer's manual
Remove obstruction
Repair per instructions in manufacturer's manual
Replace per instructions in manufacturer's manual
Allow to cool; determine cause
Adjust per instructions in manufacturer's manual
Repair per instructions in manufacturer's manual
Repair per instructions in manufacturer's manual
Remove obstruction
Adjust per instructions in manufacturer's manual
Replace per instructions in manufacturer's manual
7 - 23
CORRECTION