Cylinder diameter | 83 mm |
piston stroke | 73 mm |
Volume | 2.5 liters |
Compression pressure in the cylinder at 250 rpm: | |
- nominal | 203 psi |
– minimum | 142 psi |
Oil pressure (engine hot): | |
– 1000 rpm | 28 psi |
– 3000 rpm | 49 – 71 psi |
cylinder head | |
Maximum allowable deformation | 0.098 mm |
Valves and valve springs | |
Flap Border Width: | |
- inlet | 0.888 mm |
- graduation | 0.985 mm |
Valve stem diameter: | |
- inlet | 5.878 - 5.890 mm |
- graduation | 5.872 - 5.885 mm |
Clearance between valve stem and guide sleeve: | |
- inlet | 0.025 - 0.058 mm |
- graduation | 0.030 - 0.063 mm |
Valve spring: | |
- maximum deviation from the right angle | 1.6mm |
– free length: | |
• inlet | 43.3 mm |
• graduation | 46.2 mm |
Camshafts and valve lifters | |
Bearing neck diameter | |
Rear cylinder block: | |
– N1: | |
• inlet valve | 29.502 - 29.528 mm |
• exhaust valve | 25.532 - 25.550 mm |
– N2, 3 and 4 | 25.502 - 25.525 mm |
– N5 | 25.532 - 25.550 mm |
Front cylinder block: | |
– N1: | |
• inlet valve | 25.502 - 25.550 mm |
• exhaust valve | 29.505 - 29.522 mm |
– N2, 3 and 4 | 25.502 - 25.525 mm |
– N5 | 25.502 - 25.550 mm |
Bearing lubrication gap: | |
– N1 and 5 | 0.04 - 0.08 mm |
– N2, 3 and 4 | 0.07 - 0.11 mm |
Cam Height (intake and exhaust valves): | |
– nominal | 42.863 mm |
– minimum | 42.667 mm |
Free move: | |
- nominal | 0.05 - 0.10 mm |
- maximum | 0.14 mm |
beat | 0.017 mm |
Pusher diameter | 29.488 - 29.503 mm |
The gap between the pusher and the walls of its nest: | |
- nominal | 0.245 - 0.065 mm |
- maximum | 0.178 mm |
valve clearance (1998 models only) | |
- inlet | 0.243 - 0.310 mm |
- graduation | 0.263 - 0.328 mm |
Crankshaft and connecting rods | |
Connecting rod bearing: | |
– diameter | 52.108 - 52.120 mm |
– maximum taper and ovality | 0.05 mm |
Bearing lubrication gap: | |
- nominal | 0.023 - 0.043 mm |
- the maximum allowable | 0.08mm |
Side clearance (free play) connecting rod: | |
- nominal | 0.175 - 0.325 mm |
- the maximum allowable | 0.400 mm |
Main bearing: | |
– diameter: | |
• nominal | 60.936 – 60.980 mm |
• minimum | 60.965 mm |
– maximum taper and ovality | 0.005 mm |
Lubrication gap: | |
- nominal | 0.038 - 0.055 mm |
- maximum | 0.063 mm |
Free wheeling of the crankshaft: | |
- nominal | 0.08 - 0.28 mm |
- the maximum allowable | 0.31 mm |
Thrust half ring thickness | 1.970 - 2.018 mm |
Cylinder block | |
Maximum allowable deformation of the surface of the cylinder block | 0.148 mm |
Cylinder diameter | 83.17 - 83.19 mm |
Pistons, piston rings | |
Piston diameter (nominal) | 83.125 - 81.525 mm |
Clearance between piston and cylinder: | |
- nominal | 0.030 - 0.055 mm |
- maximum | 0.128 mm |
Piston ring end clearance: | |
– N1 (top) compression ring | 0.150 - 0.295 mm |
– N2 (average) compression ring | 0.250 - 0.375 mm |
- oil scraper ring | 0.200 - 0.675 mm |
Clearance between piston ring and ring groove side: | |
– N1 (top) compression ring | 0.020 - 0.065 mm |
– N2 (average) compression ring | 0.030 - 0.065 mm |
- maximum | 0.15 mm |
Tightening torques, Nm
Main bearing cap bolts: | |
– stage 1 bolts A and B | 23 – 26 |
– step 2 bolts C | 18 – 20 |
– stage 3 bolts A | Tighten another 80° |
– stage 4 bolts B | Tighten another 70° |
– stage 5 bolts C | Tighten another 60° |
– stage 6 bolts A, B and C | Repeat steps 3, 4 and 5 |
Bolts securing the bottom half of the block to the top* | 19 – 20 |
Connecting rod cap bolts: | |
– step 1 | 22 – 26 |
– stage 2 | Tighten another 90° |
* See subsection 3.2.2 for more information.
** Tighten only after the main bearing cap bolts have been tightened.