Contents: Checking the cylinder head ↧ Checking valves and guide bushings ↧ Checking valve seats ↧ Checking valve springs ↧ Checking camshafts ↧
Checking the cylinder head
The cylinder head is checked for deformation using a measuring ruler and feeler gauge in the planes shown in the figure. Control parameters:
- maximum non-flatness of the surface in contact with the cylinder head gasket: no more than 0.05 mm;
- cylinder head height: 138.13-138.18 mm.
Checking valves and guide bushings
The measurement of the internal diameter of the guide bushing and the external diameter of the valve is performed in three planes along two mutually perpendicular diameters in each plane.
Intake/exhaust valve guide inner diameter: 6.0-6.02mm.
Intake valve stem diameter: 5.955-5.97mm.
Exhaust valve stem diameter: 5.935-5.95mm.
Checking valve seats
The valve seats are visually inspected for signs of overheating, mechanical damage and the tightness of the valve surface.
Inlet seat sealing surface width: 1.17-1.57 mm.
Width of the closing surface of the outlet seat: 1.4-1.8 mm.
Checking valve springs
During the inspection, a visual inspection is performed for damage and the length of the spring is measured.
Valve spring length at load 580 ±29 N: 23 mm.
Valve spring length at load 260 ±16 N: 33 mm.
Checking camshafts
When checking camshafts, the following parameters are measured:
- outer diameter of journal No.1 of camshaft: 29.935-29.95 mm;
- outer diameter of journal No.2, 3, 4, 5 of camshaft: 26.935-26.95 mm:
- outer diameter of plain bearing No.1: 30.0-30.021 mm;
- outer diameter of plain bearing No.2, 3, 4, 5: 27.0-27.021 mm;
- cam shaft lift height: 7.2 mm.
[The article was borrowed from the website «ChevyMan.ru»]