Yanmar EF-494T User Manual

3 ENGINE 3 ENGINE
EF494T TM 06/2011 edition
111
Unit: mm
Parts
4TNV88
Criteria
Limit
Top ring
Groove width
2.060-2.075
－
Dimension B
1.970-1.990
1.950
Min gap between groove and ring
0.070-0.105
－
Opening
0.200-0.400
0.490
Second ring
Groove width
2.025-2.040
2.140
Dimension B
1.970-1.990
0.195
Min gap between groove and ring
0.035-0.070
0.190
Opening
0.200-0.400
0.490
Oil ring
Groove width
4.015-4.030
4.130
Dimension B
3.970-3.990
3.950
Min gap between groove and ring
0.025-0.060
0.180
Opening
0.200-0.400
0.490
(A) Dimension B (width)
(B) Thickness
Piston and piston ring table, oversize (0.25 mm)
Model
Piston assembly
code
Piston assembly code
Valve clearance
(A) Valve clearance
(B) Lock nut
(C) Adjusting screw
4TNV88
129005-22700
129005-22900
Injection timing marks
(A) Injection timing gauge
(B) Cylinder Top Dead Center (TDC)
(C) Alignment point

Yanmar EF-494T Specifications

General

Brand	Yanmar
Model	EF-494T
Category	Tractor
Language	English