Isuzu 3LD - Engine Repair Specifications - 3 L

IV. Engine Repair Specifications – 3L
U L-Series Diesel 29
Mechanical Specifications
Cylinder Head/ Valve Train Standard Service Limit
Valve Clearance¬ 0.40 mm/ 0.01575 in 0.025 mm/ 0.010 in
Cylinder head Warpage- 0.075 mm/ 0.0029 in 0.15 mm/ 0.0059 in
Cylinder Head Height ® 64.0 mm/ 2.5197 in 63.7 mm/ 2.5079 in
Valve Depression ¯ 0.7 mm/ 0.0276 in 1.2 mm/ 0.0427 in
Hot Plug Depression 0.05 mm/ 0.002 in 0.05 mm/ 0.002 in
Valve Margin Thickness ° 1.0 mm/03937 in .7 mm/.0276 in
Valve Stem Diameter 7.0 mm/ .2756 in (Int.)
7.0 mm/ .2756 in (Exh.)
6.85 mm/ .2697 (Int.)
6.80 mm/ .2677 (Int.)
Valve Spring Installed Height 29.9 mm -------------------------------------
Valve Seat Angle
45°
¬ Valve adjustment clearances are established cold.
- Maximum grinding allowance is 0.3 mm/ 0.0118 in
® Measurement is established by measuring from the head’s sealing surface to the rocker bracket
surface area.
¯ Dimension taken from the cylinder head surface to the top of the valves
° Specification is for both intake and exhaust valves.
Short Block Specifications Standard Service Limit
Main Bearing Bore Diameter 55.98 mm/ 2.2039 in 56.0 mm/ 2.2047in
Cylinder Block Height
3LA1/LB1
3LD1
281 mm/ 11.0630 in
308 mm/ 12.1260 in
280.7 mm/ 11.0512 in
307.7 mm/ 12.1142 in
Main Bearing Journal Diameter
3LA1/LB1
3LD1
52.0 mm/ 2.0472 in
60.0 mm/ 2.3622 in
51.86 mm/ 2.0417 in
59.86 mm/ 2.3567 in
Crank Pin Diameter
3LA1/LB1
3LD1
43.0 mm/ 1.6929 in
49.0 mm/ 1.9291 in
42.87 mm/ 1.6878 in
48.87 mm/ 1.9240 in
Connecting Rod Big End Diameter
3LA1/LB1
3LD1
46 mm/ 1.8110 in
52 mm/ 2.0472 in
--------------------------------
Piston Protrusion .400 mm/ .0158 in --------------------------------
Piston to Cylinder Clearance 0.015-.035 mm/ 0.0006-.0014 in
Main Bearing Clearance 0.029-0.072 mm/ 0.0011-
0.0028 in
.0127 mm/ 0.005in
Connecting Rod Bearing Clearance 0.035 mm-0.073 mm/
0.0014-0.0029 in
0.12 mm/ 0.0047 in
Crank Gear/ Idler Gear Backlash 0.07 mm/ 0.0028 in 0.2 mm/ 0.0079 in
Cam Gear/ Idler Backlash 0.06 mm/ 0.0024 in 0.2 mm/ 0.0079 in
Crankshaft End Play 0.06-.26 mm
(0.0024-0.0102 in)
0.30 mm/ 0.0118 in