Engine Mechanical (SOHC): Specifications — Subaru Forester SG (2002-2005)

SPECIFICATIONS

Engine	Type			Horizontally opposed, liquid cooled, 4-cylinder, 4-stroke gasoline engine
	Valve arrangement			Belt driven, single over-head camshaft, 4-valve/cylinder
	Bore x Stroke		Mm (in)	99.5 x 79.0 (3.917 x 3.110)
	Displacement		Cm 3 (cu in)	2,457(150)
	Compression ratio			10.0
	Compression pressure (at 200 - 300 rpm)		(kg/cm 2 , psi)	1,079 - 1,275 (11.0-13.0, 156 - 185)
	Number of piston rings			Pressure ring: 2, Oil ring: 1
	Intake valve timing	Opening		1°BTDC
	Intake valve timing	Closing		51° ABDC
	Exhaust valve timing	Opening		50° BBDC
	Exhaust valve timing	Closing		6° ATDC
	Valve clearance	Intake	Mm (in)	0.2010.02 (0.007910.0008)
	Valve clearance	Exhaust	Mm (in)	0.2510.02 (0.009810.0008)
	Idling speed [At neutral position on MT, or "P" or "N" position on AT] rpm			No load	6501100 (MT vehicles)
				A/C ON	850+100 (AT vehicles)
	Firing order			1 --> 3 --> 2 --> 4
	Ignition timing		BTDC/rpm	10° ± 87650 (MT vehicles) 15° ± 8°/700 (AT vehicles)
Belt tensioner adjuster	Protrusion of adjuster rod				5.2 - 6.2 mm (0.205 - 0.244 in)
Belt tensioner	Spacer O.D.				17.955 - 17.975 mm (0.7069 - 0.7077 in)
	Tensioner bush I.D.				18.00 - 18.08 mm (0.7087 - 0.7118 in)
	Clearance between spacer and bush			STD	0.025 - 0.125 mm (0.0010 - 0.0049 in)
	Clearance between spacer and bush			Limit	0.175 mm (0.0069 in)
	Side clearance of spacer			STD	0.20 - 0.55 mm (0.0079 - 0.0217 in)
	Side clearance of spacer			Limit	0.81 mm (0.0319 in)
Valve rocker arm	Clearance between shaft and arm			STD	0.020 - 0.054 mm (0.0008 - 0.0021 in)
Valve rocker arm	Clearance between shaft and arm			Limit	0.10 mm (0.0039 in)
Camshaft	Bend limit				0.025 mm (0.0010 in)
	Thrust clearance			STD	0.030 - 0.090 mm (0.0012 - 0.0035 in)
	Thrust clearance			Limit	0.11 mm (0.0039 in)
	Cam lobe height		Intake	STD	39.485 - 39.585 mm (1.5545 - 1.5585 in)
			Intake	Limit	39.385 mm (1.5506 in)
			Exhaust	STD	39.257 - 39.357 mm (1.5455 - 1.5495 in)
			Exhaust	Limit	39.157 mm (1.5416 in)
	Camshaft journal O.D.				31.928 - 31.945 mm (1.2570 - 1.2577 in)
	Camshaft journal hole I.D. (Cylinder head)				32.000 - 32.018 mm (1.2598 - 1.2605 in)
	Oil clearance			STD	0.055 - 0.090 mm (0.0022 - 0.0035 in)
	Oil clearance			Limit	0.10 mm (0.0039 in)
Cylinder head	Surface warpage limit (mating with cylinder block)				0.05 mm (0.0020 in)
	Surface grinding limit				0.1 mm (0.004 in)
	Standard height				97.5 mm (3.84 in)
Valve seat	Refacing angle				90°
	Contacting width		Intake	STD	1.1 mm (0.043 in)
			Intake	Limit	1.8 mm (0.071 in)
			Exhaust	STD	1.5 mm (0.059 in)
			Exhaust	Limit	2.2 mm (0.087 in)
Valve guide	Inner diameter				6.000 - 6.012 mm (0.2362 - 0.2367 in)
	Protrusion above head			Intake	20.0 - 20.5 mm (0.787 - 0.807 in)
	Protrusion above head			Exhaust	16.5 - 17.0 mm (0.650 - 0.669 in)
Valve	Head edge thickness		Intake	STD	1.0 mm (0.039 in)
			Intake	Limit	0.6 mm (0.024 in)
			Exhaust	STD	1.2 mm (0.047 in)
			Exhaust	Limit	0.6 mm (0.024 in)
	Stem diameter			Intake	5.950 - 5.965 mm (0.2343 - 0.2348 in)
	Stem diameter			Exhaust	5.945-5.960 mm(0.2341 -0.2346 in)
	Stem oil clearance		STD	Intake	0.035 - 0.062 mm (0.0014 - 0.0024 in)
			STD	Exhaust	0.040 - 0.067 mm (0.0016 - 0.0026 in)
			Limit		0.15 mm (0.0059 in)
	Overall length			Intake	120.6 mm (4,75 in)
	Overall length			Exhaust	121.7 mm (4.79 in)
Valve spring	Free length				54.30 mm (2.1378 in)
	Squareness				2.5°, 2.4 mm (0.094 in)
	Tension/spring height			Set	214 - 246 N (21.8 - 25.1 kgf, 48.1 - 55.3 lb)/ 45.0 mm (1.772 in)
	Tension/spring height			Lift	526 - 582 N (53.6 kgf, 118.3 lb)/34.7 mm (1.366 in)
Cylinder block	Surface warpage limit (mating with cylinder head)				0.05 mm (0.0020 in)
	Surface grinding limit				0.1 mm (0.004 in)
	Cylinder bore			A	99.505 - 99.515 mm (3.9175 - 3.9179 in)
	Cylinder bore			B	99.495 - 99.505 mm (3.9171 - 3.9175 in)
	Taper			STD	0.015 mm (0.0006 in)
	Taper			Limit	0.050 mm (0.0020 in)
	Out-of-roundness			STD	0.010 mm (0.0004 in)
	Out-of-roundness			Limit	0.050 mm (0.0020 in)
	Piston clearance			STD	0.010 - 0.030 mm (0.0004 - 0.0012 in)
	Piston clearance			Limit	0.050 mm (0.0020 in)
	Enlarging (boring) limit				0.5 mm (0.020 in)
Piston	Outer diameter		STD	A	99.485 - 99.495 mm (3.9167 - 3.9171 in)
			STD	B	99.475 - 99.485 mm (3.9163-3.9167 in)
			0.25 mm (0.0098 in) OS		99.725 - 99.735 mm (3.9262 - 3.9266 in)
			0.50 mm (0.0197 in) OS		99.875 - 99.985 mm (3.9360 - 3.9364 in)
	Standard inner diameter of piston pin hole				23.000 - 23.006 mm (0.9055 - 0.9057 in)
Piston pin	Outer diameter				22.994 - 23.000 mm (0.9053 - 0.9055 in)
	Standard clearance between piston pin and piston				0.004 - 0.008 mm (0.0002 - 0.0003 in)
	Degree of fit				Piston pin must be fitted into position with thumb at 20°C (68°F).
Piston ring	Piston ring gap		Top ring	STD	0.20 - 0.35 mm (0.0079 - 0.0138 in)
			Top ring	Limit	1.0 mm (0.039 in)
			Second ring	STD	0.37 - 0.52 mm (0.0146 - 0.0205 in)
			Second ring	Limit	1.0 mm (0.039 in)
			Oil ring	STD	0.20 - 0.50 mm (0.0079 - 0.0197 in)
			Oil ring	Limit	1.5 mm (0.059 in)
	Clearance between piston ring and piston ring groove		Top ring	STD	0.040 - 0.080 mm (0.0016 - 0.0031 in)
			Top ring	Limit	0.15 mm (0.0059 in)
			Second ring	STD	0.030 - 0.070 mm (0.0012 - 0.0028 in)
			Second ring	Limit	0.15 mm (0.0059 in)
Connecting rod	Bend twist per 100 mm (3.94 in) in length			Limit	0.10 mm (0.0039 in)
	Side clearance			STD	0.070 - 0.330 mm (0.0028 - 0.0130 in)
	Side clearance			Limit	0.4 mm (0.016 in)
Connecting rod bearing	Oil clearance			STD	0.012 - 0.030 mm (0.0005 - 0.0012 in)
	Oil clearance			Limit	0.05 mm (0.0020 in)
	Thickness at center portion			STD	1.490 - 1.500 mm (0.0587 - 0.0591 in)
				0.03 mm (0.0012 in) US	1.504 - 1.512 mm (0.0592 - 0.0595 in)
				0.05 mm (0.0020 in) US	1.514 - 1.522 mm (0.0596 - 0.0599 in)
				0.25 mm (0.0098 in) US	1.614-1.622 mm (0.0635 - 0.0639 in)
Connecting rod bushing	Clearance between piston pin and bushing			STD	0 - 0.022 mm (0 - 0.0009 in)
Connecting rod bushing	Clearance between piston pin and bushing			Limit	0.030 mm (0.0012 in)
Crankshaft	Bend limit				0.035 mm (0.0014 in)
	Crank pin and crank journal		Out-of-roundness		0.020 mm (0.0008 in) or less
	Crank pin and crank journal		Grinding limit		0.250 mm (0.0098 in)
	Crank pin outer diameter			STD	51.984 - 52.000 mm (2.0466 - 2.0472 in)
				0.03 mm (0.0012 in) US	51.954 - 51.970 mm (2.0454 - 2.0461 in)
				0.05 mm (0.0020 in) US	51.934 - 51.950 mm (2.0446 - 2.0453 in)
				0.25 mm (0.0098 in) US	51.734 - 51.750 mm (2.0368 - 2.0374 in)
	Crank journal outer diameter		#1, #3	STD	59.992 - 60.008 mm (2.3619 - 2.3625 in)
				0.03 mm (0.0012 in) US	59.962 - 59.978 mm (2.3607 - 2.3613 in)
				0.05 mm (0.0020 in) US	59.942 - 59.958 mm (2.3599 - 2.3605 in)
				0.25 mm (0.0098 in) US	59.742 - 59.758 mm (2.3520 - 2.3527 in)
			#2, #4, #5	STD	59.992 - 60.008 mm (2.3619 - 2.3625 in)
				0.03 mm (0.0012 in) US	59.962 - 59.978 mm (2.3607 - 2.3613 in)
				0.05 mm (0.0020 in) US	59.942 - 59.958 mm (2.3599 - 2.3605 in)
				0.25 mm (0.0098 in) US	59.742 - 59.758 mm (2.3520 - 2.3527 in)
	Thrust clearance			STD	0.030 - 0.115 mm (0.0012 - 0.0045 in)
	Thrust clearance			Limit	0.25 mm (0.0098 in)
	Oil clearance		#1	STD	0.003 - 0.030 mm (0.0001 - 0.0012 in)
			#1	Limit	0.040 mm (0.0016 in)
			#2	STD	0.012 - 0.033 mm (0.0005 - 0.0013 in)
			#2	Limit	0.045 mm (0.0018 in)
			#3	STD	0.003 - 0.030 mm (0.0001 - 0.0012 in)
			#3	Limit	0.040 mm (0.0016 in)
			#4	STD	0.012 - 0.033 mm (0.0005 - 0.0013 in)
			#4	Limit	0.045 mm (0.0018 in)
			#5	STD	0.010 - 0.031 mm (0.0004 - 0.0012 in)
			#5	Limit STD	0.040 mm (0.0016 in)
Crankshaft bearing	Crankshaft bearing thickness		#1, #3	STD	1.998 - 2.011 mm (0.0787 - 0.0792 in)
				0.03 mm (0.0012 in) US	2.017 - 2.020 mm (0.0794 - 0.0795 in)
				0.05 mm (0.0020 in) US	2.027 - 2.030 mm (0.0798 - 0.0799 in)
				0.25 mm (0.0098 in) US	2.127 - 2.130 mm (0.0837 - 0.0839 in)
			#2, #4, #5	STD	2.000 - 2.013 mm (0.0787 - 0.0793 in)
				0.03 mm (0.0012 in) US	2.019 - 2.022 mm (0.0795 - 0.0796 in)
				0.05 mm (0.0020 in) US	2.029 - 2.032 mm (0.0799 - 0.0800 in)
				0.25 mm (0.0098 in) US	2.129 - 2.132 mm (0.0838 - 0.0839 in)