Contents Section: Mechanical All sections

Engine Mechanical (H4DOTC): Specifications Subaru Impreza GD/GC/GG рестайлинг 2

Mechanical 6 illustrations ~180 words

SPECIFICATIONS

EngineTypeHorizontally opposed, liquid cooled, 4-cylinder, 4-stroke gasoline engine
Valve arrangementBelt driven, double overhead camshaft, 4-valve/cylinder
Bore x StrokeMm (in)99.5x79.0(3.92x3.11)
Piston displacementCm 3 (cu in)2,457(149.94)
Compression ratio8.4
Compression pressure (at 200-300rpm)KPa (kgf/cm 2 , psi)981-1,177(10 - 12, 142 - 171)
Number of piston ringsPressure ring: 2, Oil ring: 1
Intake valve timingOpeningMax. retard5° ATDC
Max. advance15°BTDC
ClosingMax. retard65° ABDC
Max. advance45° ABDC
Exhaust valve timingOpening55° BBDC
Closing5° ATDC
Valve clearanceMm (in)IntakeSTD0.20±0.02 (0.0079±0.0008)
ExhaustSTD0.35±0.02 (0.0138±0.0008)
Idling speed [At neutral position on MT or "P" or "N" range on AT]RpmNo loadMT:700±100 AT:700±100
A/CONA/C Refrigerant pressure (LOW)MT:725±100 AT: 750 ±100
A/C Refrigerant pressure (HIGH)MT:800±100 AT: 825±100
Firing order1 --> 3 --> 2 --> 4
Ignition timingBTDC/rpmMT model17°±10°/700
AT model17°±10°/700
STD: Standard I.D.: Inner Diameter O.D.: Outer Diameter OS: Oversize US: Undersize

GENERAL SPECIFICATIONS

Belt tension adjusterProtrusion of adjuster rodMm (in)5.2 - 6.2 (0.205 - 0.244)
Belt tensionerSpacer O.D.Mm (in)17.955 - 17.975(0.7069 - 0.7077)
Tensioner bushing I.D.Mm (in)18.0 - 18.08(0.7087 - 0.7118)
Clearance between spacer and bushingMm (in)STD0.025 - 0.125(0.0010 - 0.0049)
Limit0.175(0.069)
Side clearance of spacerMm (in)STD0.2 - 0.55 (0.0079 - (3.0217)
Limit0.81 (0.0319)
CamshaftBend limitMm (in)0.020 (0.0008)
Thrust clearanceMm (in)STD0.068 - 0.116 (0.0027 - 0.0046)
Limit0.14 (0.0055)
Cam lobe heightMm (in)IntakeSTD46.55 - 46.65 (1.833 - 1.837)
Limit46.45(1.829)
ExhaustSTD46.75 - 46.85 (1.841 - 1.844)
Limit46.65(1.837)
Journal O.D.Mm (in)STDFront37.946 - 37.963 (1.4939 - 1.4946)
Center rear29.946 - 29.963(1.1790-1.1796)
Oil clearanceMm (in)STD0.037 - 0.072 (0.0015 - 0.0028)
Limit0.10 (0.0039)
Cylinder headSurface warpage limit (mating with cylinder head)Mm (in)0.035 (0.0014)
Surface grinding limitMm (in)0.3(0.012)
Standard heightMm (in)127.5(5.02)
Valve seatRefacing angle90°
Contacting widthMm (in)IntakeSTD0.6-1.4(0.024 - 0.055)
Limit1.7 (0.067)
ExhaustSTD1.2-1.8(0.047 - 0.071)
Limit2.2 (0.087)
Valve guideInside diameterMm (in)6.000 - 6.012 (0.2362 - 0.2367)
Protrusion above headMm (in)15.8 - 16.2 (0.622 - 0.638)
ValveHead edge thicknessMm (in)IntakeSTD1.0 -1.4 (0.039 - 0.055)
Limit0.8(0.031)
ExhaustSTD1.3-1.7(0.051 -0.067)
Limit0.8(0.031)
Stem diameterMm (in)Intake5.955 - 5.970 (0.2344 - 0.2350)
Exhaust5.945 - 5.960 (0.2341 - 0.2346)
Stem oil clearanceMm (in)STDIntake0.030 - 0.057 (0.0012 - 0.0022)
Exhaust0.040 - 0.067 (0.0016 - 0.0026)
Limit0.15(0.0059)
Overall lengthMm (in)Intake104.4(4.110)
Exhaust104.65(4.120)
Valve springFree lengthMm (in)47.32 (1.863)
Squareness2.5°, 2.1 mm (0.083 in) or less
Tension/spring heightN {kgf, lbf)/mm (in)Set205 - 235 (20.9 - 24.0, 46.1 - 52.8)/36.0 (1.417)
Lift426 - 490 (43.4 - 50.0, 95.8 - 110)/26.50 (1.043)
Cylinder blockSurface warpage limit (mating with cylinder head]Mm (in)0.025 (0.00098)
Surface grinding limitMm (in)0.1 (0.004)
Standard heightMm (in)201.0(7.91)
Inside diameterMm (in)STDA99.505 - 99.515 (3.9175 - 3.9179)
B99.495 - 99.505 (3.9171 - 3.9175)
TaperMm (in)STD0.015(0.0006)
Limit0.050 (0.0020)
Out-of-roundnessMm (in)STD0.010(0.0004)
Limit0.050 (0.0020)
Piston clearanceMm (in)STD0.010 - 0.010 (-0.0004 - 0.0004)
Limit0.030(0.0012)
Cylinder enlarging (boring) limit (dia.)Mm (in)To 100.005 (3.937)
PistonOuter diameterMm (in)STDA99.505 - 99.515 (3.9175 - 3.9179)
B99.495 - 99.505 (3.9171 - 3.9175)
0.25 (0.0098) OS99.745 - 99.765 (3.9270 - 3.9278)
0.50 (0.0197) OS99.995 -100.015 (3.9368 - 3.9376)
Piston pinStandard clearance between piston pin and hole in pistonMm (in)STD0.004 - 0.008 (0.0002 - 0.0003)
Limit0.020 (0.0008)
Degree of fitPiston pin must be fitted into position with thumb at 20°C (68°F).
Piston ringPiston ring gapMm (in)Top ringSTDOuter circle side: 0.20 - 0.25 (0.0079 - 0.0098)
Inner circle side: 0.20 - 0.30 (0.0079 - 0.0117)
Limit1.0(0.039)
Second ringSTD0.37 - 0.52 (0.015 - 0.020)
Limit1.0(0.039)
Oil ringSTD0.20 - 0.50 (0.0079 - 0.0197)
Limit1.5(0.059)
Clearance between piston ring and piston ring grooveMm (in)Top ringSTD0.04 - 0.08(0.0016 - 0.0031)
Limit0.15(0.0059)
Second ringSTD0.030 - 0.070 (0.0012 - 0.0028)
Limit0.15(0.0059)
Connecting rodBend twist per 100 mm (3.94 in) in lengthMm (in)Limit0.10(0.0039)
Side clearanceMm (in)STD0.070 - 0.330 (0.0028 - 0.0130)
Limit0.4(0.016)
Connecting rod bearingOil clearanceMm (in)STD0.017 - 0.045 (0.0007 - 0.0018)
Limit0.05 (0.0020)
Thickness at center portionMm(m)STD1.490 - 1.502 (0.0587 - 0.0591)
0.03 (0.0012) US1.504 - 1.512 (0.0592 - 0.0595)
0.05 (0.0020) US1.514 - 1.522 (0.0596 - 0.0599)
0.25 (0.0098) US1.614 - 1.622 (0.0635 - 0.0639)
Connecting rod bushingClearance between piston pin and bushingMm (in)STD0 - 0.022 (0 - 0.0009)
Limit0.030(0.0012)
CrankshaftBend limitMm (in)0.035 (0.0014)
Crank pinMm (in)Out-of-roundness0.003(0.0001)
Cylindrically0.004 (0.0002)
Grinding limit (diameter)To 51.750 (2.0374)
Crank journalMm (in)Out-of-roundness0.005 (0.0002)
Cylindrically0.006 (0.0002)
Grinding limit (diameter)To 59.750 (2.3524)
Crank pin outer diameterMm (in)STD51.984 - 52.000 (2.0466 - 2.0472)
0.03 (0.0012) US51.954 - 51.970 (2.0454 - 2.0461)
0.05 (0.0020) US51.934 - 51.950(2.0447 - 2.0453)
0.25 (0.0098) US51.734 - 51.750 (2.0368 - 2.0374)
Crank journal outer diameterMm (in)STD59.992 - 60.008(2.3619 - 2.3625)
0.03 (0.0012) US59.962 - 59.978 (2.3607 - 2.3613)
0.05 (0.0020) US59.942 - 59.958 (2.3599 - 2.3605)
0.25 (0.0098) US59.742 - 59.758 (2.3520 - 2.3527)
Side clearanceMm (in)STD0.030 - 0.115 (0.0012 - 0.0045)
Limit0.25 (0.0098)
Oil clearanceMm (in)STD0.010 - 0.030 (0.0004 - 0.0012)
Limit0.40(0.0016)
Main bearingThickness at centerMm (in)#1,#3STD1.998 - 2.011 (0.0787 - 0.0792)
0.03 (0.0012) US2.017 - 2.020 (0.0794 - 0.0795)
0.05 (0.0020) US2.027 - 2.030 (0.0798 - 0.0799)
0.25 (0.0098) US2.127 - 2.130 (0.0837 - 0.0839)
#2, #4, #5STD2.000 - 2.013 (0.0787 - 0.0793)
0.03 (0.0012) US2.019 - 2.022 (0.0795 - 0.0796)
0.05 (0.0020) US2.029 - 2.032 (0.0799 - 0.0800)
0.25 (0.0098) US2.129 - 2.132 (0.0838 - 0.0839)
STD: Standard I.D.: Inner Diameter O.D.: Outer Diameter OS: Oversize US: Undersize

BELT TENSION ADJUSTER REFERENCE

Exploded View Of Timing Belt Components With Torque Specifications. Scheme 274

Scheme 274: Exploded View Of Timing Belt Components With Torque Specifications

Exploded View Of Cylinder Head And Camshaft Components With Torque Specifications. Scheme 275

Scheme 275: Exploded View Of Cylinder Head And Camshaft Components With Torque Specifications

Exploded View Of Cylinder Head And Valve Assembly Components. Scheme 276

Scheme 276: Exploded View Of Cylinder Head And Valve Assembly Components

Exploded View Of Cylinder Block Components With Torque Specifications. Scheme 277

Scheme 277: Exploded View Of Cylinder Block Components With Torque Specifications

Exploded View Of Crankshaft And Piston Components With Torque Specifications. Scheme 278

Scheme 278: Exploded View Of Crankshaft And Piston Components With Torque Specifications

Identifying Engine Mounting Components With Torque Specifications. Scheme 279

Scheme 279: Identifying Engine Mounting Components With Torque Specifications

For operations related to intake and exhaust valve, refer to "Cylinder Head".

< Ref. to REMOVAL, Cylinder Head. > < Ref. to INSTALLATION, Cylinder Head. >

For operations related to piston, refer to "Cylinder Block".

< Ref. to REMOVAL, Cylinder Block. > < Ref. to INSTALLATION, Cylinder Block. >

For operations related to connecting rod, refer to "Cylinder Block".

< Ref. to REMOVAL, Cylinder Block. > < Ref. to INSTALLATION, Cylinder Block. >

For operations related to crankshaft, refer to "Cylinder Block".

< Ref. to REMOVAL, Cylinder Block. > < Ref. to INSTALLATION, Cylinder Block. >