Workshop Manual

REPAIR STANDARDS
208
Major Name
Inspection Item
Nominal Assembly
Limit Repair Procedure Comments
Category
of Part Dimension Standard Value
Clearance with
Clearance with cylinder:
major axis
grade position from upper face
0.017 – 0.055
70 mm (2.76 in)
(0.0007 – 0.0022)
Piston pin and piston pin hole 0.002 – 0.015 Replace piston or clearance (0.00008 – 0.0006) piston pin
Pin wear
Dia. 31.0 30.992 – 30.98 Dia. 30.95
Replace piston pin
(1.2205) (1.2202 – 1.2197) (1.2185)
1st
compression ring
0.20 – 0.40
Piston Ring Gap 2nd
(0.008 – 0.016)
1.5 Replace rings or
compression ring (0.059) piston
Oil ring
0.10 – 0.30
(0.004 – 0.012)
1st
compression ring 1.11 – 1.59
(2.45 – 3.50/ Replace
Tension 2nd 10.9 – 16.0)
kgf (lb/N) compression ring
4.0 – 6.0
Oil ring
(8.82 – 13.2/
Replace
Measure with
39.2 – 58.8)
expander attached
1st 0.090 – 0.125 0.15
compression ring (0.0035 – 0.0049) (0.006)
Clearance between piston 2nd 0.050 – 0.075 0.15 Replace rings or ring and ring compression ring (0.002 – 0.003) (0.006) piston groove
Oil ring
0.030 – 0.070 0.15
(0.0012 – 0.0028) (0.006)
Ring gap orientation At 120° intervals
Main Operating Parts
Piston Ring Pistons
When assembling compression rings on piston, be sure ring’s marked surface is up. Backwards installation will result in excessive oil consumption. No top/bottom to oil ring.