Distributor

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Categories: Engine Electrical System | Distributor

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The distributor on the Datsun 1200's A12 engine is of the traditional "points" type. Contacts points, rather than an electronic control module, are used to switch the coil on and off thus generating a spark. GX models with the A12GX Engine used the same but with different advance curves.

Contents 1 Overview 2 Late-Model Distributor 3 Warning 4 Advance Characteristics 5 Timing 6 Removal & Installation 7 Interchange 8 Part Numbers 9 Competition Distributor 10 Maintenance Parts 10.1 Cap & Rotor 10.2 Points & Condensor 10.3 Vacuum Advance 11 Electronic Distributor Upgrades 12 Photo Index

Overview

Distributor hole in A12 block

Early 1200 distributor

Late-Model Distributor

Late-model 1200 distributor (after 1973).

See main article: Sunny Truck Distributors

Warning

Most old distributors have a bad vacuum advance unit. This goes for wrecking yards, and probably the one in your 1200 too, if you haven't checked it recently. On a recent trip to the wrecking yard, 9 out of 10 circa 1980 Datsun distributors had a bad advance.

See Vacuum Gun

If your advance is bad, plug the vacuum hose at the carburetor until you get a new unit. It will drive fine plugged, but fuel economy will suffer.

Advance Characteristics

Datsun 1200 uses base (static) timing of 5 degrees or 7 degrees (EXHAUST Emission-controlled engines).

Total Timing is 30 degrees +- 2 degrees (28 to 32 degrees).

See main articles:

• Timing
• Spark Curve

Timing

See Ignition Timing

Removal & Installation

See Installing Distributor

Interchange

In general you can swap any A-series distributor into any other A-series. Technically, few are a strict interchange do to variations in advance curves used for various years and markets.

When interchanging distributors between 1966-1973 (early A-series) and 1974-2007 (late A-series) engines, minor modification to the mount plate is needed. See Using Newer Distributor or Using Older Distributor.

Part Numbers

Datsun 1200 uses a Hitachi D40/D41 type distributor, with the smaller 70mm I.D. cap. Same as Datsun B10, L-series and many other Datsun engine families. A14 did not use this type.

JDM 1200s alternately use a Mitsubishi TVA/TVG distributor.

All these distributors are physically the same (will bolt right in and connect electrically). The difference is:

• Mechanical advance curve
• Vacuum advance curve

They differ due to differences in requirements for automatic transmission vs manual transmission, and for emission control requirements.

North America B110

• 22100-H1001 ASSY-DISTRIBUTOR (HITACHI D411-61) non-EXHAUST CANADA
• 22100-H1901 DISTRIBUTOR [early] (HITACHI D412-63) EXHAUST

AT EXHAUST

• 22100-H1902 DISTRIBUTOR 1271- (HITACHI D412-63A) (Hollander 152)
• 22100-H7100 DISTRIBUTOR 0772- (HITACHI D412-89) (Hollander 1060)

MT EXHAUST

• 22100-H3900 DISTRIBUTOR 0671-
• 22100-H3901 DISTRIBUTOR 1271- (HITACHI D412-80A) (Hollander 1059)

Japan-market

• 22100-H1011 ASSY-DISTRIBUTOR (MITSUBISHI TVG-4FL) Except GX
• 22100-H1001 ASSY-DISTRIBUTOR (HITACHI D411-61) Except GX
  • Also CANADA 1970
• 22100-H2300 ASSY-DISTRIBUTOR (HITACHI D407-54) (High Gas) GX
• 22100-18016 ASSY-DISTRIBUTOR (MITSUBISHI TVA-4F2L) (Reg Gas) GX
• 22100-18006 ASSY-DISTRIBUTOR (HITACHI D412-53K) (Reg Gas) GX
  • Same as B10 sedan, last revision

Hitachi D4n Parts

• 22136-H2300 ASSY-BRAKER (breaker plate)
• 22136-E4600 ASSY-BRAKER PLATE from 1271
• 22145-18005 SET-CONTACT
• 22157-H1000 ROTOR-HEAD, formerly 22157-78500
• 22162-21007 CAP
• 22165-30101 POINT-CARBON
• 22102-00801 CONDENSOR

Competition Distributor

The Datsun Competition distributor had no vacuum advance, as it was designed for full-throttle use.

See main article: Competition Distributor

Maintenance Parts

Cap & Rotor

22157-H1000 HEAD-ROTOR
22162-21007 ASSY-CAP

Points & Condensor

22145-18005 SET-CONTACT 
22102-00801 CONDENSER

Condensor Interchange
Isuzu 1.8
Mazda 1972-1973 1.8/1.6
Honda 1973-1979
Nissan A/L/R/U/J
Subaru 1971-1975 1.1/1.3/1.4 H4

Vacuum Advance

ASS'Y-VACUUM CONTROL

• 22301-H1000 non-EVAPO superseded by part number 22301-M1500 $27.25
• 22301-B3000 EVAPO
• 22301-B3001 EVAPO (formerly 22301-B3000) $35.07
• 22301-H3900 EVAPO from 0671 $35.92
• 22301-H3901 EVAPO from 1271 (formerly 22301-H3900) $32.22
• 22301-H1900 EVAPO AUTO from 1271 (formerly 22301-B0300) $30.13
• 22301-E4603 EVAPO AUTO from 0772 (formerly 22301-H1900) $39.13

Orange:

• 4mm travel adjustment
• Inside needle height: 21.5 mm (from spring seat)
• Spring 33.5 mm free height
• Diaphragm diameter approx 52mm

The needle/screw height adjust max travel. The spring sets the starting point.

• diameter: 63 mm (cut gasket larger)

Possible Fit:

• Standard Motor Product VC507 Nissan 240Z 71-70 $26
• Nardek NVA-605 Australia

Electronic Distributor Upgrades

For converting your A12 to electronic ignition, see Electronic Ignition

Photo Index

Timing Plate

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