Subaru 2004 IMPREZA Service Manual page 25

C: INSPECTION
Check all disassembled parts for wear, damage or other abnormalities. Repair or replace faulty parts as re-
quired.
Part name
Pipe
Clamp
Hose
CAUTION:
Although the surface layer materials of rubber hoses have excellent weathering resistance, heat re-
sistance and resistance for low temperature brittleness, they are likely to be damaged chemically by
brake fluid, battery electrolyte, engine oil and automatic transmission fluid and their service lives are
to be very shortened. It is very important to keep the hoses free from before mentioned fluids and to
wipe out immediately when the hoses are adhered with the fluids.
Since the resistances for heat or low temperature brittleness are gradually declining according to
time accumulation of hot or cold conditions for the hoses and their service lives are shortening ac-
cordingly, it is necessary to perform the careful inspection frequently when the vehicle is used in hot
weather areas, cold weather area and a driving condition in which many steering operations are re-
quired in short time.
Particularly, continuous work of relief valve over 5 seconds causes to reduce service lives of the hos-
es, the oil pump, the fluid, etc. due to over heat.
Trouble
Pressure hose burst
Forced out return hose
Fluid bleeding out of hose
slightly
Crack on hose
Pipe Assembly [LHD MODEL]
Inspection
• O-ring fitting surface for damage
• Nut for damage
• Pipe for damage
• Clamps for weak clamping force
• Flared surface for damage
• Flare nut for damage
• Outer surface for cracks
• Outer surface for wear
• Clip for damage
• End coupling or adapter for degradation
Possible cause
Excessive holding time of relief status
Malfunction of relief valve
Poor cold characteristic of fluid
Poor connection
Poor holding of clip
Poor cold characteristic of fluid
Wrong layout, tensioned
Excessive play of engine due to deterioration of
engine mounting rubber
Improper stop position of pitching stopper
Excessive holding time of relief status
Excessive tightening torque for return hose clip
Power steering fluid, brake fluid, engine oil, electro-
lyte adhere on the hose surface
Too many times use in extremely cold weather
PS-69
POWER ASSISTED SYSTEM (POWER STEERING)
Replace with a new one.
Replace with a new one.
Replace with a new one.
Instruct the customers.
Replace the oil pump.
Replace the fluid.
Correct.
Retighten.
Replace the fluid.
Replace the hose.
Replace the defective parts.
Replace the defective parts.
Replace.
Instruct customer.
Replace.
Replace.
Pay attention on service work.
Replace.
Instruct the customers.
Remedy
Corrective action