Yanmar 4TNE98 - Idler Gear Shaft and Bushing; Timing Gear Backlash

4TNV98 & 4TNE98 Diesel Engine Section 3. Engine 69
(Camshaft Cont.)
Inspection Item Standard Limit
Reference
Page
Bushing Inside Diameter
1.9681 - 1.9707 in.
(49.990 - 50.055 mm)
1.9736 in.
(50.130 mm)
Camshaft Outside Diameter
1.9655 - 1.9665 in.
(49.925 - 49.950 mm)
1.9642 in.
(49.890 mm)
Gear End
Oil Clearance
0.0016 - 0.0051 in.
(0.040 - 0.130 mm)
0.0094 in.
(0.240 mm)
Bushing Inside Diameter
1.9685 - 1.9695 in.
(50.000 - 50.025 mm)
1.9724 in.
(50.100 mm)
Camshaft Outside Diameter
1.9650 - 1.9659 in.
(49.910 - 49.935 mm)
1.9636 in.
(49.875 mm)
Intermediate
Oil Clearance
0.0026 - 0.0045 in.
(0.065 - 0.115 mm)
0.0089 in.
(0.225 mm)
Bushing Inside Diameter
1.9685 - 1.9695 in.
(50.000 - 50.025 mm)
1.9724 in.
(50.100 mm)
Camshaft Outside Diameter
1.9655 - 1.9665 in.
(49.925 - 49.950 mm)
1.9642 in.
(49.890 mm)
Flywheel End
Oil Clearance
0.0020 - 0.0039 in.
(0.050 - 0.100 mm)
0.0083 in.
(0.210 mm)
See
Inspection of
Camshaft on
page 125.
Idler Gear Shaft and Bushing
Inspection Item Standard Limit
Reference
Page
Shaft Outside Diameter
1.8091 - 1.8100 in.
(45.950 - 45.975 mm)
1.8071 in.
(45.900 mm)
Bushing Inside Diameter
1.8110 - 4.8120 in.
(46.000 - 46.025 mm)
1.8140 in.
(46.075 mm)
Oil Clearance
0.0010 - 0.0030 in.
(0.025 - 0.075 mm)
0.0069 in.
(0.175 mm)
See
Inspection of
Idler Gear
and Shaft on
page 126.
Timing Gear Backlash
Inspection Item Standard Limit
Reference
Page
Crank Gear, Cam Gear, Idler Gear, Fuel Injection
Pump Gear and PTO Gear
0.0031 - 0.0055 in.
(0.08 - 0.14 mm)
0.0063 in.
(0.16 mm)
Lubricating Oil Pump Gear
0.0035 - 0.0059 in.
(0.09 - 0.15 mm)
0.0067 in.
(0.17 mm)
See
Checking
Timing Gear
Backlash on
page 112.