Revision as of 06:44, 16 November 2014

A12A engine (1237cc) was used 1978-1982. It has a 75mm bore, larger than an A12 (1171cc) engine with 73mm bore (NOTE: the A13 Engine used a 76mm bore). The A12A block is virtually identical to the original 1974 A12. The A12A used a casting similar to the A12 and same stroke, but machined with a 75 mm bore (up from 73 mm) for an increase of 66 cc capacity. The A12A shared a common block and crankshaft with the redesigned A12 and A13 engines. Although referred to as "A12" and "1200" in most Datsun literature, it was explicitly stamped 'A12A' on the engine ID pad. In the Japan market both engines were used at the same time, with A12 fitted to B310 wagons and A12A fitted to B310 Sedan & Coupe.

1 Identification
2 Applications
3 Specifications
4 Part Numbers
5 Photo Index

Identification

A12A Engine ID Mark

Chassis Plate

Applications

B310
* 1979 'Datsun Sunny 210' B310 Canada
* 1980-1982 'Datsun 210' B310 USA and Canada 
* 1977-1980 Datsun Sunny B310 Japan and Asia markets S,K only
  (replaced by the new A13 for 1981/1982)
  Wagon used A12, not A12A

H65 = A12
H85 = A12A
H86 = A13

Specifications

58 HP
1237 cc (A12 is 1171 cc)
75 mm bore (2mm larger than A12)
70 mm stroke (same as A12)
19.7 mm piston pins (same as A14)
New (A14 style) manifold bolt pattern

B310 with A12A - Japan Market sedans & coupes

Part Numbers

All part numbers are for B310.

CYLINDER BLOCK ASSY
11010-H9960 A12A USA 0879-
11010-H8500 
* A12A JAP 7712-8010
* A12A CAN 1278-0779
11010-H8502 A12A CAN ^11010-H8500
11010-H9001 A12A CAN 0879- °11010-H8502

Connecting Rods
12100-H8500 B310 A12A/A13S CONNECTING ROD
* for use with 19 mm piston pin (same as A14)

Head Gasket [75 mm bore]
11044-H8501 JAP A12 S,K 7712-8010

Cylinder Head
11041-H8500 JAP A12S.S,K 7712-7909
11041-H8501 JAP A12S.S,K 7910-8010

Piston Set with Pin
12010-H8511 JAP A12S.S,K 7712-7909 STD
12014-H8514 JAP A12S.S,K 7712-7909 OS=0.50
12014-H8516 JAP A12S.S,K 7712-7909 OS=1.00
12010-H8521 JAP A12S.S,K 7910-8010 STD
12010-H8524 JAP A12S.S,K 7910-8010 OS=0.50
12010-H8526 JAP A12S.S,K 7910-8010 OS=1.00

Piston Ring Set
12033-H8500 JAP A12S.S,K 7712-8010 STD
12035-H8500 JAP A12S.S,K 7712-8010 OS=0.50
12037-H8500 JAP A12S.S,K 7712-8010 OS=1.00

Crankshaft
12200-H5001 JAP A12,A12A -7909
12200-H8500 JAP A12,A12A,A13S 7910-

Intake Manifold [wet,round port]
14003-H8550 JAP A12S.S,K 7712-7909 
14003-H8551 JAP A12S.S,K,7910-8010 > 14003-H8550
* also fits JAP A13S 8011-

Exhaust Manifold [3-Bolt flange]
14004-H8501 JAP A12S,A14S.S,K+AT 7712-8010

14035 Manifold Gasket
14035-H8501 JAP A12S.S,K 7712-8010, A13S 8011-

EGR with Air Injection was fitted to A12A JAP
* A12 (Van) had EGR but not AIS
Carbon Canister was fitted 
* van came with Flow Guide Valve
Catalytic Converter was fitted
* van was fitted with resonator
Specific carburetor was fitted.