Repair Specifications - Yanmar BY Series Service Manual

ENGINE

Repair Specifications

Component
Cylinder Head Must Not Be Machined
Valve Guides Are Not Available as Replacement Parts
Standard Valve Guide ID - Intake
Standard Valve Guide ID - Exhaust
Valve Side Movement (Max.) (Valve-to-Guide Wear)
Camshaft Bearing Diameter
Camshaft Bearing Width
Cylinder Head
Valve Seat Angle
Outer Correction Angle
Inner Correction Angle
Valve Seat Width - Intake
Valve Seat Width - Exhaust
Valve Seat Surface Outside Diameter - Intake
Valve Seat Surface Outside Diameter - Exhaust
Thrust Bearing Width
Camshaft Radial Runout
Axial Play
Head Diameter - Intake
Head Diameter - Exhaust
Valves
Stem Diameter - Intake
Stem Diameter - Exhaust
5-8
Remarks
Specifications
Specification
6.0 +0.015 mm
(0.2362 +0.0006 in.)
6.0 +0.015 / +0.03 mm
(0.2362 +0.0006 / +0.0012 in.)
0.5 mm
(0.020 in.)
23 mm (0.906 in.)
15.85 -0.08 mm
4BY
(0.6240 -0.003 in.)
18.85 -0.08 mm
6BY
(0.742 -0.003 in.)
45°
15°
60°
1.0 +0.1 mm
(0.039 +0.004 in.)
1.2 +0.1 mm
(0.047 +0.004 in.)
24.5 +0.1 mm
(0.965 +0.004 in.)
24.4 +0.1 mm
(0.961 +0.004 in.)
19.000 +0.01 mm
(0.748 +0.004 in.)
0.040 - 0.060 mm
(0.0015 - 0.0024 in.)
0.02 - 0.150 mm
(0.0008 - 0.0059 in.)
25.9 ±0.1 mm
(1.020 ±0.004 in.)
25.9 ±0.1 mm
(1.020 ±0.004 in.)
5.92 ±0.02 mm
(0.233 ±0.0008 in.)
5.92 ±0.02 mm
(0.233 ±0.0008 in.)
BY Service Manual