Subaru Crosstrek Service Manual: Engine noise Inspection

Subaru Crosstrek Service Manual / Mechanical(h4do) / Engine noise Inspection

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.

Crankshaft Specification

MECHANICAL(H4DO) > CrankshaftSPECIFICATIONRefer to “Cylinder Block” for removal and installation procedures of the crankshaft. Cylinder Block > REMOVAL"> Cylinder Block > ...

Engine oil pressure Inspection

MECHANICAL(H4DO) > Engine Oil PressureINSPECTION1. Disconnect the ground cable from battery. NOTE">2. Remove the oil pressure switch. Oil Pressure Switch > REMOVAL">3. Install ...

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The ABS prevents the lock-up of wheels which may occur during sudden braking or braking on slippery road surfaces. This helps prevent the loss of steering control and directional stability caused by wheel lock-up. When the ABS is operating, you may hear a chattering noise or feel a slight v ...

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