MECHANICAL(H4DO) > Engine Noise
INSPECTION
Type of sound | Condition | Possible cause |
Regular clicking sound | Sound increases as engine speed increases. |
• Valve mechanism is defective
• Incorrect cam clearance
• Worn camshaft
• Broken valve spring
• Defective valve shim
Heavy and dull clank
Oil pressure is low.
• Worn crankshaft bearing
• Worn connecting rod bearing
Oil pressure is normal.
• Loosened flywheel mounting bolt
• Damaged engine mounting
High-pitched clank
Sound is noticeable when accelerating with an overload condition.
• Ignition timing advanced
• Accumulation of carbon inside combustion chamber
• Wrong heat range of spark plug
• Improper octane value gasoline
Clank noise when engine speed is between 1,000 and 2,000 r/min
Sound is reduced when the fuel injector connector of the noisy cylinder is disconnected.*
• Worn crankshaft bearing
• Worn connecting rod bearing
Knocking sound when engine is operating under idling speed and engine is warm
Sound is reduced when the fuel injector connector of the noisy cylinder is disconnected.*
• Worn cylinder liner and piston ring
• Broken or stuck piston ring
• Worn piston pin and piton pin hole of piston
Sound is not reduced if each fuel injector connector is disconnected in turn.*
• Unusually worn valve rocker
• Unusually worn valve shim
• Worn cam sprocket
• Worn journal of cam carrier and camshaft cap
Squeaky sound
—
• Insufficient generator lubrication
Rubbing sound
—
• Poor contact of generator brush and rotor
Gear scream when starting engine
—
• Defective ignition starter switch
• Worn gear and starter pinion
Sound like polishing glass with a dry cloth
—
• Defective V-belt tensioner assembly (loose V-belt)
• Defective water pump shaft
Hissing sound
—
• Insufficient compression
• Air leakage in air intake system, hose, connection or manifold
Timing chain noise
—
• Loose timing chain
• Timing chain contacting with adjacent part
Valve noise
—
• Incorrect cam clearance
* When disconnecting the fuel injector connector, the malfunction indicator light illuminates and DTC is stored in ECM memory.
Therefore, perform the Clear Memory Mode Clear Memory Mode > OPERATION"> and Inspection Mode Inspection Mode > PROCEDURE"> after connecting the fuel injector connector.
Replacement
MANUAL TRANSMISSION AND DIFFERENTIAL(5MT) > Transmission Gear OilREPLACEMENT1. Pull out the oil level gauge.2. Lift up the vehicle.3. Using the TORX® bit T70, remove the drain plug, and drain the gear oil completely.CAUTION:• Immediately after the vehicle has been running or after idling f ...
Removal
CONTROL SYSTEMS > Select CableREMOVAL1. Shift the select lever to “N” range.2. Disconnect the ground cable from battery. NOTE">NOTE:For model with battery sensor, disconnect the ground terminal from battery sensor.3. Lift up the vehicle.4. Remove the center exhaust pipe. Cen ...
Base display audio set (if equipped)
Power/VOLUME knob
Eject button
AUDIO/TUNE knob
HOME button
APPS button
Display
SEEK/TRACK buttons
The audio set will operate only when the
ignition switch is in the "ACC" or "ON"
position.
Power and audio controls: refer to
"Basic operation"
SUBARU STARLINK (if equipp ...