Contents: General characteristics ↧ Cylinder head ↧ Valves and related components ↧ Crankshaft and connecting rods ↧ Cylinder block ↧ Pistons and piston rings ↧ Camshaft ↧ Tightening torques, foot-pounds ↧
General characteristics
RPO code - LG6
VIN code - D
Cylinder displacement: 189 cubic inches
Cylinder Compression Pressure - Minimum 100 psi
The maximum difference in pressure in different cylinders is 30%
Firing order: 1-2-3-4-5-6
Oil pressure - 15 psi at 1100 rpm
Cylinder head
Maximum allowable deformation is 0.005 inches
Maximum allowable mark depth is 0.010 inches
Valves and related components
Valve chamfer Width-Minimum 1/32 inch
Valve seat chamfer angle - 46°
Valve stem to guide clearance - 0.0010-0.0027 in
Free length of valve spring (inlet and outlet) — 1.91 inches
Valve spring pressure:
- Closed — 82 pounds with a length of 1.58 inches
- Open — 191 pounds with a length of 1.291 inches
Installation height-1.5748 inches
Crankshaft and connecting rods
Crank pin:
- Diameter - 1.9994-1.9983 inches
- Bearing clearance - 0.0011-0.0034 inches
Connecting rod end play - 0.014-0.0267 inches
Main bearing journal:
- Diameter - 2.6473-2.6483 inches
- Bearing clearance - 0.0012-0.0027 inches
- Maximum taper/out-of-roundness is 0.0002 inches
Crankshaft axial play (at the thrust bearing) — 0.0024-0.0083 inches
Cylinder block
Cylinder liners:
- Diameter - 3.503-3.506 inches
- Maximum cylinder ovality is 0.0005 inches
- Maximum cylinder taper (on the stubborn side) — 0.0005 inches
Maximum distortion of the contact surface of the block to the cylinder head - If more than 0.010 in. must be removed, replace the block
Pistons and piston rings
The gap between the piston and the cylinder walls is 0.0009-0.0022 inches
Piston ring gaps:
- Upper Compression ring — 0.010-0.020 inches
- Lower Compression ring — 0.020-0.028 inches
- Oil scraper ring - 0.010-0.030 inch
Piston ring groove clearance:
- Compression rings - 0.0020-0.0035 inches
- Oil scraper ring - 0.008 inch
Camshaft
Bearing journal diameter - 1.8678-1.8815 inches
Bearing clearance - 0.001-0.004 inches
Cam lift:
- Inlet valve — 0.2306 inches
- Exhaust valve — 0.2619 inches
Tightening torques, foot-pounds
Main Bearing Cap Bolts - 72
Connecting rod cap nuts - 39
Camshaft Sprocket Bolts - 18
Flywheel to crankshaft mounting bolts - 50
Note: More detailed tightening torque values are given in parts 2.1.
[The original source of the article is the website: chevyman.ru]