General Specifications - 2.5L
GENERAL SPECIFICATIONS - 2.5L
| Item | Specification |
|---|---|
| Displacement | 2.5L (153 CID) |
| Number of cylinders | 6 |
| Bore and stroke | 82.4 x 79.5 |
| Firing order | 1-4-2-5-3-6 |
| Oil pressure (hot 1500 RPM) | 138--310 kPa (20--45 psi) |
| Cylinder head and valve train | |
| Combustion chamber volume | 44.5 +/-1.5 cc |
| Valve seats - width intake | 1.1--1.4 mm |
| Width exhaust | 1.4--1.7 mm |
| Angle | 44.75 degrees |
| Runout (T.I.R.) max | 0.04 mm |
| Valve stem to guide clearance intake | 0.020--0.069 mm |
| Valve stem to guide clearance exhaust | 0.045--0.094 mm |
| Valve head diameter intake | 32 mm |
| Valve head diameter exhaust | 26 mm |
| Gauge diameters | 31 and 24.5 mm |
| Valve face runout limit | 0.05 mm |
| Valve face angle | 45.5 degrees |
| Valve stem diameter (STD) intake | 5.975--5.995 mm |
| Valve stem diameter (STD) exhaust | 5.950--5.970 mm |
| Valve springs compression pressure (N @ spec length) intake | 680 N @ 30.19 mm |
| Valve springs compression pressure (N @ spec length) exhaust | 680 N @ 30.19 mm |
| Free length (approximate) intake | 46.8 mm |
| Free length (approximate) exhaust | 46.8 mm |
| Installed pressure (N @ spec length) intake | 228 N @ 39.99 mm |
| Installed pressure (N @ spec length) exhaust | 228 N @ 39.99 mm |
| Service limit | 10% Pressure Loss @ 30.09 |
| Out of square limit | 1% |
| Rocker arm ratio | 1.8:1 |
| Hydraulic valve tappet diameter (STD) | 16-15.988 mm |
| Clearance to bore | 0.018--0.069 mm |
| Service limit | 0.016 mm |
| Hydraulic leakdown rate | 5--25 seconds |
| Collapsed valve tappet gap - desired | 0.50--1.11 mm |
| Camshaft | |
| Lobe lift | |
| Intake (primary) | 4.79 mm |
| Intake (secondary) | 4.79 mm |
| Exhaust | 4.79 mm |
| Allowable lobe lift loss | 0 mm |
| Theoretical valve lift @ zero lash | |
| Intake (primary) | 9.80 mm |
| Intake (secondary) | 9.80 mm |
| Exhaust | 9.80 mm |
| End play | |
| Standard | 0.025--0.165 mm |
| Service limit | 0.190 mm |
| Journal to bearing clearance | |
| Standard | 0.025--0.076 mm |
| Service limit | 0.121 mm |
| Journal diameter (all) | 26.926--26.936 mm |
| Bearing inside diameter (all) | 27.012--26.897 mm |
| Cylinder block Head gasket surface |
|
| Head gasket surface flatness-cylinder block | 0.025 / 25 x 25.050/ 150 x 150 |
| Head gasket surface flatness-cylinder head | 0.025 / 25 x 25.050/ 150 x 150 |
| Head gasket surface flatness-cylinder block | 0.025 / 25 x 25.050/ 150 x 150 |
| Head gasket surface finish -flatness-cylinder head | 0.025 / 25 x 25.050/ 150 x 150 |
| Main bearing bore diameter | 68.998--69.022 mm |
| Cylinder bore - Diameter | Grade 1: 82.4--82.410 mm grade 2: 82.411--82.421 mm grade 3: 82.420--82.430 mm |
| Surface finish (RMS) | 0.2--0.6 microns |
| Out-of-round limit | 0.015 mm |
| Out-of-round service limit | 0.020 mm |
| Taper service limit | 0.006 mm |
| Crankshaft | |
| Main bearing journal diameter | 62.968--62.992 mm |
| Connecting rod journal diameter | 49.970--49.990 mm |
| Crankshaft free play | 0.110--0.232 mm |
| Crankshaft runout to rear face of cylinder block | 0.050 mm max |
| Connecting rod bearings | |
| Clearance to crankshaft | 0.028--0.066 mm |
| Bearing wall thickness (STD) 0.250 mm undersize - add 0.125 mm to standard or grade 2 thickness | 1.503 |
| Main bearings - Clearance to crankshaft-desired | 0.025--0.045 mm |
| Main bearings - Clearance to crankshaft-allowable | 0.025--0.050 mm |
| Main bearings - Bearing wall thickness - grade 1 | 2.501 mm |
| Main bearings - Bearing wall thickness - grade 2 | 2.505 mm |
| Main bearings - Bearing wall thickness - grade 3 | 2.510 mm |
| Connecting rod | |
| Piston pin bore diameter | 21.071--21.032 mm |
| Length (center to center) | 138.06--138.4 mm |
| Alignment (bore to bore max difference) | Pin bore and crankshaft bearing bore must be parallel and in same vertical plane within the specified total difference when measured at the ends of a 203 mm bar, 101.5 mm on each side of the centerline |
| Twist | 0.050 mm per 25 |
| Band | 0.038 mm per 25 |
| Side clearance (assembled to crank) - Standard | 0.100-0.30 mm |
| Side clearance (assembled to crank) - Service limit | 0.35 mm max. |
| Pistons | |
| Diameter | Measured at 43 mm from outer perimeter top of piston to the pin axis |
| Coded grade 1 | 82.390--82.410 mm |
| Coded grade 2 | 82.398--82.442 mm |
| Coded grade 3 | 82.410--82.430 mm |
| Piston to bore clearance | 0.012 to 0.022 mm |
| Pin bore diameter | 21.008--21.012 mm |
| Ring groove width | - |
| Compression (top) | - |
| Compression (bottom) | - |
| Oil ring | 3.030--3.055 mm |
| Piston pin - Length | 55.05--55.47 mm |
| Piston pin - Diameter | 21.011--21.013 mm |
| Pin to piston clearance | -0.005 to +0.001 mm |
| Pin to rod clearance - Standard | 0.004--0.020 mm |
| Pin to rod clearance - Service limit | 0.035 mm |
| Side clearance | - |
| Compression (top) | 0.040--0.075 mm |
| Compression (bottom) | 0.040--0.085 mm |
| Oil ring | Snug fit |
| Service limit | 0.10 mm |
| Piston ring gap | Specification 82.4 mm diameter gauge |
| Compression (top) - gauge diameter | 0.100--0.250 mm |
| Compression (bottom) - gauge diameter | 0.27--0.42 mm |
| Oil Ring (steel rail) - gauge diameter | 0.15--0.65 mm |
| Compression (top) service limit | 0.50 mm max |
| Compression (bottom) - service limit | 0.65 mm max |
| Oil ring (steel rail) - service limit | 0.90 mm max |
| Lubrication system | |
| Oil capacity with filter change | 5.5 liter |
| Drive belt tension | |
|
NOTE:
Belts have differing tension specifications depending on whether they are new installed or used
|
Automatic tensioners |
| 6 Rib front end accessory drive (FEAD)-Water pump belt | Automatic tensioners |
| 3 Rib rear end accessory drive (READ)-Water pump belt | No adjustment required |