Subaru Legacy IV (2008 year). Service manual - part 489

ME(H6DO)-82

Piston

MECHANICAL

25.Piston

A: SPECIFICATION

Refer to “Cylinder Block” for removal and installa-
tion procedures of pistons. <Ref. to ME(H6DO)-64,
REMOVAL, Cylinder Block.> <Ref. to ME(H6DO)-
66, INSTALLATION, Cylinder Block.>

ME(H6DO)-83

Connecting Rod

MECHANICAL

26.Connecting Rod

A: SPECIFICATION

Refer to “Cylinder Block” for removal and installa-
tion procedures of connecting rods. <Ref. to
ME(H6DO)-64, REMOVAL, Cylinder Block.> <Ref.
to ME(H6DO)-66, INSTALLATION, Cylinder
Block.>

ME(H6DO)-84

Crankshaft

MECHANICAL

27.Crankshaft

A: SPECIFICATION

Refer to “Cylinder Block” for removal and installa-
tion procedures of the crankshaft. <Ref. to
ME(H6DO)-64, REMOVAL, Cylinder Block.> <Ref.
to ME(H6DO)-66, INSTALLATION, Cylinder
Block.>

ME(H6DO)-85

Engine Trouble in General

MECHANICAL

28.Engine Trouble in General

A: INSPECTION

NOTE:
The “RANK” shown in the chart shows the possibilities of the cause of trouble in order from “Very often” to
“Rarely”.
A — Very often
B — Sometimes
C — Rarely

Symptoms

Problem parts etc.

Possible cause

RANK

1. Engine does not start.

 

1) Starter does not turn.

Starter

Defective battery-to-starter harness

B

Defective starter switch

C

Defective inhibitor switch

C

Defective starter

B

Battery

Improper connection of the terminal

A

Run-down battery

A

Defective charging system

B

Friction

Seizure of crankshaft and connecting rod bearing

C

Seized camshaft

C

Seized or stuck piston and cylinder

C

2) Initial combustion does 
not occur.

Starter

Defective starter

C

Engine control system <Ref. to EN(H6DO)(diag)-2, Basic Diagnostic Procedure.>

A

Fuel line

Defective fuel pump and relay

A

Clogged fuel line

C

Lack of or insufficient fuel

B

Timing chain

Trouble

B

Defective timing

B

Compression

Incorrect valve clearance

C

Loosened spark plug or defective gasket

C

Loosened cylinder head bolt or defective gasket

C

Improper valve sealing

C

Defective valve stem

C

Worn or broken valve spring

B

Worn or stuck piston rings, cylinder and piston

C

Incorrect valve timing

B

Improper engine oil (low viscosity)

B

Trouble of valve lifter

C

Trouble of valve lifter. In case noise occurs with valve 
moving, or when the harness involved to the oil switch-
ing solenoid valve, variable valve lift diagnosis oil pres-
sure switch and variable valve lift has trouble in a past.

B