General information
Cylinder diameter: 03.06 mm
Piston stroke: 91.95 mm
Working volume - 1991 cm³ (2 liters)
Compression:
- Nominal - 11.8 bar
- Minimum - 82 bar
- Maximum difference between cylinders —— 1 bar
Oil pressure in a warmed-up Yari engine at 3000 rpm is 3.9-4.9 bar
Cylinder head
Allowable warpage is 0.05 mm
Valves and valve springs
Valve Plate Edge Height:
- Inlet - 1.1 mm
- Exhaust - 1.2 mm
Valve stem diameter:
- Intake - 5.969-5.984 mm
- Exhaust - 5.965-5.979 mm
Clearance between rod and guide bushing:
- Inlet - 0.025-0.060 mm
- Exhaust - 0.0076-0.165 mm
Spring:
- Non-perpendicularity - 1.55 mm
- Length in free state - 36.5-44.0 mm
Camshafts and tappets
Height of cams:
- Intake - 42.97
- Graduations - 43.34
- Permissible wear of cams is 0.15 mm
Neck diameter: 25.94-25.96 mm
The permissible ellipticity of the necks is 0.003 mm
Permissible radial runout is 0.03 mm
Bearing clearance:
- Nominal - 0.035-0.081 mm
- The maximum permissible value is 0.15 mm
Axial clearance of the shaft is 0.079-0.200 mm
Pusher diameter: 29.96-29.97 mm
Clearance of tappets in bores:
- Nominal - 0.025-0.066 mm
- The maximum permissible value is 0.17 mm
Thermal clearance in valves (only for engines produced since 1998) — 0.23-0.29 mm
Crankshaft and connecting rods
Crank pins:
- Diameter - 47.94-47.96 mm
- Permissible taper is 0.005 mm
- Permissible ellipticity is 0.0025 mm
- Bearing clearance: 0.013-0.038 mm
Axial clearance of the lower connecting rod head:
- Nominal - 0.12-0.26 mm
- The maximum permissible value is 0.30 mm
Root necks:
- Diameter - 55.94-55.95 mm
- Permissible taper is 0.005 mm
- Allowable ellipticity is 0.0025 mm
- Permissible radial runout is 0.03 mm
- Bearing clearances:
- №3 (central) — 0.030-0.056 mm
- The rest are 0.023-0.051 mm
- The maximum permissible value is 0.066 mm
Shaft axial play:
- Nominal - 0.08-0.20 mm
- The maximum permissible value is 0.3 mm
Cylinder block
Permissible warping of the surface under the head is 0.05 mm
Cylinder bore diameter: Nominal - 83.00-83.02 mm
Permissible taper and ellipse - 0.01 mm
Pistons and connecting rods
Piston diameter: 82.95-03.97 mm
Clearance between piston and cylinder:
- Nominal - 0.030-0.051 mm
- The maximum permissible value is 0.15 mm
Piston ring gaps:
- Compression rings
- Nominal - 0.15-0.30 mm
- The maximum permissible value is 0.50 mm
- Oil scraper
- Nominal - 0.20-0.70 mm
- Maximum permissible value is 0.90 mm
Ring clearance in grooves (compression rings only)
- Nominal - 0.036-0.066 mm
- The maximum permissible value is 0.084 mm
Tightening torques for connections, Nm
Main bearing cap bolts:
- 1st stage - 17-22
- 2nd stage - Turn 90° further
Connecting rod lower head nuts:
- 1st stage - 22-26
- 2nd stage - Turn 90° further
Lower block reinforcement bolts - 19-24
* Other values of tightening torques for connections are given in chapter 2A.