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Datsun 620 Specification and Tune-Up Data (continued)
 
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Tune-Up Specs:   <MENU^  
 
 
Valve Clearance:
Intake, Hot 0.010in. (0.25mm)
Exhaust, Hot 0.012in. (0.30mm)
Intake, Cold 0.008in. (0.20mm)
Exhaust, Cold 0.010in. (0.25mm)
 
 
Points Gap: 0.018-0.022 in. (0.45-0.55 mm) (L16, L18, L20b)
 
 
Dwell Angle: 49-55º (L16, L18, L20b)
 
 
Spark Plug Gap:
1969-1972 0.0231-0.035 in.
(0.8-0.9 mm)
1973-1974 0.028-0.031 in.
(0.7-0.8 mm)
1975 (Cali) &
1975-77 (non Cali)
0.031-0.035 in.
(0.8-0.9 mm)
1976-77 (Cali) &
All 1978 and later
0.039-0.043 in.
(1.0-1.1 mm)
 
   
 
Spark Plug Type:
1972 NGK BP5ES
1973-1974 NGK B6ES
1975-1976 NGK BP6ES
1977 Cai, all 1978:  
Standard type: NGK BP5ES-11
Hot type: NGK BP4E-11, or BP5ES-11
Cold type: NGK BP7ES-11
1977 non Cali:
Standard type: NGK BP6ES
Hot type: NGK BP4E, or BP5ES
Cold type: NGK BP7ES
1979 all:
Standard type: NGK BP6ES-11, or BPR6ES-11*
Hot type: NGK BP4E-11, BPR5ES-11, or
BPR4E-11*, BPR4ES-11*
Cold type: NGK BP7ES-11, or NGK BPR7ES-11*
* Optional Resistor Type
 
 
Timing Marks:   <MENU^  
 
 
Early L-Series:  
 
 
  Some early L-Series engines do not have a 20º mark.
 
Late L-Series:  
     
 
     
   
     
 
 
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Ignition Timing
(at idle speed):
L16, 1970-1971 (advanced) 10º BTDC
L16, 1970-1971 (retarded) 0º (TDC)
L16, 1972 (advanced) 7º BTDC
L16, 1972 (retarded) 0º (TDC)
L16, 1973 (advanced) 12º BTDC
L16, 1973 (retarded):  
Trucks trough chassis # PL620-141296 5º BTDC
Trucks from chassis # PL620-141297 8º BTDC
L18, 1974 12º BTDC
L20b, 1975-1977  
Non-California 12º BTDC
California 10º BTDC
L20b, 1978-1979 12º BTDC
Auto Transmissions (tranny in drive)
 
 
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Idle speed:
L16, 1970-1972 700 rpm
L16 and L18, 1973-1974
Manual 800 rpm
Automatic 650 rpm *
L20b, 1975-1977
Manual 750 rpm
Automatic 650 rpm *
L20b, 1978 600 rpm
L20b, 1979
Manual 650 rpm
Automatic 630 rpm *
L20b, 1980 600 rpm
* Auto Transmissions (tranny in drive)
 
 
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Firing Order: 1-3-4-2
 
   
 
General Engine Specifications:   <MENU^  
 
     
 
 
  L16
97.3 cu.in
(1595)
L18
108.0 cu.in
(1770)
L20b
119.1 cu.in
(1952)
HorsePower @ RPM 96 @ 5600 100 @ 5600 112 @ 5600
Ft. lbs. Torque @ RMP 100 @ 3600 100 @ 3600 108 @ 3200
Compression Ratio 8.5:1 8.5:1 8.5:1
Bore X Stroke 3.27 X 2.90 3.35 X 3.07 3.35 X 3.39
Piston Size 3.2671 - 3.2691 in 3.3451 - 3.3470 in 3.3451 - 3.3470 in
Cranking Comp 171 (psi) 171 (psi) 171 (psi)
Oil Press. 45-50 (psi) 45-50 (psi) 50 - 57 (psi)
Block Height 265.9 265.9 285.5
 
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Page last updated on Tuesday, April 1, 2014
 
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