General Specifications
GENERAL SPECIFICATIONS
| Item | Specification |
|---|---|
| Engine | |
| Displacement | 4.6L (281 CID) (2V) |
| No. cylinders | 8 |
| Bore | 90.2 mm (3.5512 in) |
| Stroke | 90 mm (3.5433 in) |
| Firing order | 1-3-7-2-6-5-4-8 |
| Oil pressure hot @ 2,500 rpm | 40-70 psi |
| Compression ratio | 9.37:1 |
| Engine weight (without accessory drive components and flexplate) | 233.1 kg (514 lb) |
| Cylinder Head and Valve Train | |
| Combustion chamber volume | 43.95 ± 1.5 cc (2.68 ± 0.092 ci) |
| Valve arrangement (front to rear) LH | EIEIEIEI |
| Valve arrangement (front to rear) RH | IEIEIEIE |
| Valve guide bore diameter | 7.044-7.015 mm (0.2773-0.2762 in) |
| Valve stem diameter (intake) | 6.995-6.975 mm (0.2753-0.2746 in) |
| Valve stem diameter (exhaust) | 6.970-6.949 mm (0.2744-0.2735 in) |
| Valve stem-to-guide clearance (intake) | 0.069-0.020 mm (0.0027-0.0007 in) |
| Valve stem-to-guide clearance (exhaust) | 0.095-0.046 mm (0.0037-0.0018 in) |
| Valve head diameter (intake) | 44.6 mm (1.7559 in) |
| Valve head diameter (exhaust) | 36.1 mm (1.4212 in) |
| Valve face runout limit | 0.05 mm (0.0019 in) |
| Valve face angle | 45.5 degrees |
| Valve seat width (intake) | 2.1-1.9 mm (0.0827-0.0748 in) |
| Valve seat width (exhaust) | 2.1-1.9 mm (0.0827-0.0748 in) |
| Valve seat runout (TIR) | 0.025 mm (0.0009 in) |
| Valve seat angle | 45.00 degrees |
| Valve spring free length (intake) | 50.2 mm (1.9763 in) |
| Valve spring free length (exhaust) | 50.2 mm (1.9763 in) |
| Valve spring out-of-square limit (intake) | 2.5 degrees |
| Valve spring out-of-square limit (exhaust) | 2.5 degrees |
| Valve spring compression pressure (intake) | 633.3-701.3 N @28.02 mm (1.1031 in) |
| Valve spring compression pressure (exhaust) | 633.3-701.3 N @28.02 mm (1.1031 in) |
| Valve spring installed height (intake) | 40.6-43.6 mm (1.5984-1.7165 in) |
| Valve spring installed height (exhaust) | 40.6-43.6 mm (1.5984-1.7165 in) |
| Valve spring installed pressure (intake) | 272.1-306.1 N @40.0 mm (1.5748 in) |
| Valve spring installed pressure (exhaust) | 272.1-306.1 N @40.0 mm (1.5748 in) |
| Valve spring installed pressure service limit (intake) | 274.6 N @40.01 mm (1.5752 in) |
| Valve spring installed pressure service limit (exhaust) | 274.6 N @40-01 mm (1.5752 in) |
| Roller follower ratio | 1.75:1 |
| Hydraulic Lash Adjuster | |
| Diameter | 15.988-16.00 mm (0.6294-0.6299 in) |
| Clearance to bore | 0.018-0.069 mm (0.0007-0.0027 in) |
| Service limit | 0.016 mm (0.0006 in) |
| Hydraulic leakdown rate | 5-25 seconds |
| Collapsed lash adjuster gap | 0.45-0.85 mm (0.0177-0.0334 in) |
| Camshaft | |
| Theoretical valve lift @zero lash (intake) | 12.0 mm (0.4724 in) |
| Theoretical valve lift @zero lash (exhaust) | 12.0 mm (0.4724 in) |
| Lobe lift (exhaust) (LH) | 7.4974 mm (0.2951 in) |
| Lobe lift (exhaust) (RH) | 7.4979 mm (0.2952 in) |
| Lobe lift (intake) | 7.1103 mm (0.2799 in) |
| Allowable lobe lift loss | 0 |
| Journal diameter | 26.96-26.93 mm (1.0615-1.0605 in) |
| Journal bore inside diameter (cap assembled) | 27.01-26.99 mm (1.0635-1.0625 in) |
| Camshaft journal-to-bearing clearance | 0.076-0.025 mm (0.0030-0.0010 in) |
| Runout: Full indicator measurement on all journals when supported on front and rear journal | 0.09 mm (0.0035 in) (4 places) |
| Camshaft end play | 0.03-0.19 mm (0.0011-0.0075 in) |
| Cylinder Block | |
| Cylinder bore diameter | 90.213-90.226 (grade 2) |
| Cylinder bore maximum taper | 0.013 mm (0.00051 in) |
| Cylinder bore maximum out-of-round | 0.015 mm (0.00059) |
| Main bearing bore inside diameter | 72.40-72.424 mm (2.8504-2.8513 in) |
| Crankshaft | |
| Main bearing journal diameter | 67.483-67.503 mm (2.6568-2.6576 in) |
| Main bearing journal maximum taper | 0.004 mm (0.0002 in) |
| Main bearing journal maximum-out-of-round | 0.0075 mm (0.0003 in) between cross sections |
| Main bearing journal-to-cylinder block clearance | 0.066-0.024 mm (0.0259-0.0009 in) |
| Connecting rod journal diameter | 53.003-52.983 mm (2.0867-2.0859 in) |
| Connecting rod journal maximum taper (straightness) | 0.004 mm (0.0002 in) |
| Connecting rod journal maximum-out-of-round | 0.0075 mm (0.0003 in) between cross sections |
| Crankshaft maximum end play | 0.301 mm (0.0118 in) |
| Piston and Connecting Rod | |
| Piston diameter | |
| Grade 1 | 90.191-90.206 mm (3.5508-3.5514 in) |
| Grade 2 | 90.203-90.220 mm (3.5513-3.5519 in) |
| Grade 3 | 90.217-90.232 mm (3.5518-3.5524 in) |
| Piston-to-cylinder bore clearance @ 43 mm from topa | -0.005 to + 0.025 mm (-0.0002 to + 0.0010 in) |
| Piston ring end gap (top) | 0.15-0.30 mm (0.0059-0.0118 in) |
| Piston ring end gap (intermediate) | 0.15-0.30 mm (0.0059-0.0118 in) |
| Piston ring end gap (oil control) | 0.15-0.30 mm (0.0059-0.0118 in) |
| Ring groove width (top) | 1.520-1.540 mm (0.0598-0.0606 in) |
| Ring groove width (intermediate) | 1.520-1.540 mm (0.0598-0.0606 in) |
| Ring groove width (oil control) | 3.03-3.055 mm (0.1193-0.1203 in) |
| Piston ring width (top) | 1.5 mm (0.05 in) |
| Piston ring width (intermediate) | 1.5 mm (0.05 in) |
| Piston ring-to-groove clearance (top) | 0.020-0.060 mm (0.0008-0.0024 in) |
| Piston ring-to-groove clearance (intermediate) | 0.020-0.060 mm (0.0008-0.0023 in) |
| Piston ring-to-groove clearance (oil control) | 0.030-0.070 mm (0.0012-0.0028 in) |
| Piston pin bore diameter | 22.0065-22.0110 mm (0.8664-0.8666 in) |
| Piston pin diameter | 21.995-21.997 mm (0.8659-0.8660 in) |
| Piston pin length | 61.870-62.120 mm (2.4358-2.4456 in) |
| Piston pin-to-piston fit | 0.0095-0.016 mm (0.0004-0.0006 in) |
| Piston-to-connecting rod clearance | 6.58-7.58 mm (0.259-0.298 in) |
| Connecting rod-to-pin clearance | 0.016-0.038 mm (0.0006-0.0015 in) |
| Connecting rod pin bore diameter | 22.02-22.01 mm (0.8671-0.8666 in) |
| Connecting rod length (centerline bore-to-bore) | 150.7 mm (5.9330 in) |
| Connecting rod maximum allowable bend | ±0.038 mm (0.0015 in) |
| Connecting rod maximum allowable twist | ±0.05 mm (0.0019 in) |
| Connecting rod bearing bore diameter | 56.86-56.89 mm (2.2388-2.2396 in) |
| Connecting rod bearing-to-crankshaft clearance | 0.06-0.02 mm (0.0026-0.0010 in) |
| Connecting rod side clearance (standard) | 0.015-0.45 mm (0.0006-0.0177 in) |
| Connecting rod side clearance (maximum) | 0.50 mm (0.0197 in) |
a New pistons have a coating that may cause the piston-to-bore clearance to read negative, indicating the piston is slightly larger than the bore. This coating will wear off and should not be a cause of concern.