Valve Seats:

Inlet valves — XM7-T Engine

Inlet valves — XN1-T engine.

Valve Seats:

Valve Seat Angles:

• Inlet valves: 120°
• Exhaust valves: 90°

Inlet Valve Seat Diameters — XM7-T Engine (above left and right) — in Millimetres:

• Diameter A, Std. size 1: 43.51 mm
• Diameter A, Std. size 2: 43.71 mm
• Diameter A, repair size 1: 43.81 mm
• Diameter A, repair size 2: 44.01 mm
• Diameter B: 41.00 mm
• Dimension “e” — 169 B engine: 7.33 mm
• — 170 engine: 10.257 mm
• Valve angle (alfa): — 169 B engine: 120°
• Valve angle (beta) — 169 B engine: 17°
• — 170 engine: 70°

Exhaust Valve Diameters — Cast Iron (see above):

• Diameter A, 170B, to 11/83, 169B from 4/85 Std. size 1: 37.01 mm
• Diameter A, 170B, to 11/83, 169B from 4/85, Std. size 2: 37.21 mm
• Diameter A, 170B, to 11/83, 169B from 4/85, repair size 1: 37.31 mm
• Diameter A, 170, to 11/83, 169B from 4/85, repair size 2: 37.51 mm
• Diameter B, all engines: 35.00 mm
• Valve seat angle (alfa): 90°
• Angle (beta): 15°