Engine Mechanical Specifications. Chevrolet Optra

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2009 🢒 Optra - Mexico 🢒 Engine 🢒 Engine Mechanical - 1.8L (L79) 🢒 Engine Mechanical Specifications

Table 1:

Application	Specification
Application	Metric	English
General Data
Engine Type	Dual Overhead Cam L-4
Displacement	1,799 cm³	109.7 in³
RPO	L79
VIN	3
Bore	81.6 mm	3.21 in
Stroke	86 mm	3.38 in
Compression Ratio	9.1:1
Maximum Power at 5,800 RPM	90 kW	107.3 hp
Maximum Torque	150 N·m	110.6 lb ft
Firing Order	1-3-4-2
Spark Plug Gap	0.9-1.1 mm	0.035-0.043 in
Block
Cylinder Bore Diameter	81.575-81.625 mm	3.2116-3.2135 in
Cylinder Bore Out-of-Round - Maximum	0.013 mm	0.0005 in
Cylinder Bore Taper - Maximum	0.013 mm	0.0005 in
Cylinder Head Deck Height - Minimum after machining	133.9 mm	5.27 in
Camshaft
Bearing Journal OD	42.455-43.470 mm	1.6714-1.7114 in
End Play	0.040-0.14 mm	0.0015-0.0055 in
Camshaft Lobe Lift - Exhaust	9.2 mm	0.36 in
Camshaft Lobe Lift - Intake	9.2 mm	0.36 in
Cooling System
Capacity	7.4 L	7.8 qt
Crankshaft
Connecting Rod Journal Diameter	48.970-48.988 mm	1.9279-1.9287 in
Connecting Rod Journal Out-of-Round	0.004 mm	0.00015 in
Crankshaft End Play	0.070-0.302 mm	0.0027-0.0118 in
Crankshaft Main Bearing Clearance - All	0.015-0.040 mm	0.00059-0.00157 in
Crankshaft Main Bearing Service Oversize - Available in 2 sizes	0.25 mm and 0.50 mm	0.0098-0.0196 in
Crankshaft Main Bearing Journal Diameter	57.974-57.995 mm	2.2824-2.2832 in
Crankshaft Main Bearing Journal Out-of-Round	0.003 mm	0.0001 in
Cylinder Head
Overall Height	133.075-134.025 mm	5.239-5.276 in
Valve Guide Height	13.7-14.0 mm	0.54-0.57 in
Valve Stem Protrusion	39.2-39.8 mm	1.54-1.56 in
Lubrication System
Lubricating Type	Forced Feed
Oil Capacity - with Filter	4.0 L	4.2 qt
Oil Pump
End Clearance	0.030-0.10 mm	0.001-0.003 in
Gears Lash	0.10-0.20 mm	0.003-0.007 in
Inner Gear to Crescent Clearance	0.35-0.40 mm	0.013-0.015 in
Outer Gear to Body Clearance	0.11-0.19 mm	0.004-0.007 in
Outer Gear to Crescent Clearance	0.40-0.50 mm	0.015-0.019 in
Piston Ring End Gap
First Compression Ring	0.2-0.35 mm	0.007-0.013 in
Second Compression Ring	0.33-0.48 mm	0.012-0.0176 in
Piston
Clearance to Bore	0.01-0.03 mm	0.00039-0.00100 in
Piston Diameter	81.575-82.105 mm	3.2115-3.2325 in
Piston Protrusion - Maximum	0.5 mm	0.019 in
Piston Taper	0.013 mm	0.0005 in
Piston Bore to Clearance	0.01-0.03 mm	0.00039-0.00100 in
Pin
Piston Pin Clearance to Piston Pin	0.0035-0.0140 mm	0.00013-0.00055 in
Piston Pin Diameter	20.9970-20.9985 mm	0.82665-0.82671 in
Piston Pin Length	61.5 mm	2.42 in
Piston Pin Offset - Towards Thrust Side	0.8 mm	0.03 in
Valves
Valve Diameter - Exhaust	29±0.1 mm	1.1417±0.0039 in
Valve Diameter - Intake	32±0.1 mm	1.2598±0.0039 in
Valve Face Angle	44°
Valve Face Runout	0.03 mm	0.00118 in
Valve Seat Width - Exhaust	1.7-2.2 mm	0.066-0.086 in
Valve Seat Width - Intake	1.0-1.5 mm	0.039-0.059 in
Valve Stem Diameter - Exhaust	5.945-5.960 mm	0.2341-0.2346 in
Valve Stem Diameter - Intake	5.945-5.960 mm	0.2341-0.2346 in
Valve Guide Inside Diameter	7.01-7.03 mm	0.276-0.277 in
Valve Lash Compensators	Hydraulic Tappet
Sealants and Adhesives
Camshaft Carrier to Cylinder Head	HN 1581 (Loctite® 515)
Exhaust Manifold Studs/Nuts	Anti-seize Compound (HMC Spec HN 1325)
Oil Pan Bolts	HN 1256 (Loctite® 242)
Oil Pump Bolts	HN 1256 (Loctite® 242)
Oil Pan Pickup Tube Bolts	HN 1256 (Loctite® 242)
Oil Gallery Plug	HN 1256 (Loctite® 242)
Rear Main Bearing Cap	GE P/N RTV 159

Valve Guide Reaming

Size	Reamer	Production Code	Service Code
Normal	--	--	K
1.9 mm (0.075 in)	KM-805	1	K1
3.8 mm (0.150 in)	--	2	K2