The engine cylinder block changed for the 1974 model year. Early A-series Datsun engines (1966-1973) feature a front-distributor design. The A Engine Redesign of 1973 moved the distributor back to mid-engine, and moved the motor mounts back 35 mm.

Overview

B10 A10 Engine * no Breather Tube at rear of block Album 17129

B110 A12 Engine * only two accessory bolt bosses on left side Post 477472

1974-up A12/A13 (short deck engines) * Many accessory bolt bosses https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/LeftsideA13Block.jpg

1974-up A13/A14/A15 (tall deck engines) * Evenly-spaced Welch Plugs Album 6107

A12 * Unevenly spaced welch plugs Album 19820

Block Oiling

Head Oiling

Early blocks have oil coming up through the head gasket to the cylinder head. 1974-up blocks have this hole plugged, and instead the oil comes up the center head bolt hole.

See Cylinder_Head_Identification#Cylinder_head_oil_passage

Brass plug in Late block

Album 20443

Pickup

Oil Pickup Location (circled) & dipstick hole (arrow)

Album 25675

Early refers to front-distributor engines (A10 and A12) before the 1974 A-series Engine Redesign.

Dimensions

A10 Deck Height: 179.1mm A12/A13/A12A Deck Height: 189.1mm A14/A15 Deck Height: 204.1mm Length (all): 393-394 mm block proper (less timing cover)

Tall Block

A14/A15 tall block engines have a Deck height of 204.1mm, or 15mm taller than an A12/A12A block. Length front-to-back is the same.

A13 - 1974 USA B210 11010-H6200 A13 BARE BLOCK 73mm/2.87" bore size

A14 * H72 or G30 cast mark with "A14" above fuel pump * #G34 cast mark 11010-H9700 A14/A15 BARE BLOCK 76mm/2.99" bore size

A15 * 1979 11010-H9700 * 1980- 11010-H9905 #G34

Short Deck

A10

B10 Sunny "Datsun 1000" came with A10 engine, 998 cc, 3-main bearing block. All other A-series engines have 5-main bearings.

Album 25622

3 mains, with and without bearings installed

http://datsun1200.com/uploads/newbb/174_691198b6db7fe.jpgPost 499124 http://datsun1200.com/uploads/newbb/174_691193d06cdaf.jpgPost 499123

JDM Catalog 11010-18000 ALL Except Coupe * uses 13035-18000 ASSY-COVER TIMING CHAIN 11010-18001 from E/# A10-184228 * uses 13035-18001 ASSY-COVER TIMING CHAIN 13035-H1000 from 0570 [updated to Double timing chain & pressure tensioner] [Fits all B10 blocks] 11010-25700 Coupe

Some B10 we re fitted with NIKKI carburetor.

Album 17129 Album 17130 Album 17131 Album 25623

http://datsun1200.com/uploads/newbb/174_691198966e9ee.jpgPost 499124 http://datsun1200.com/uploads/newbb/174_69119918e0e03.jpgPost 499124

http://datsun1200.com/uploads/newbb/174_691198843851f.jpgPost 499124 http://datsun1200.com/uploads/newbb/174_691198c7369a0.jpgPost 499124 http://datsun1200.com/uploads/newbb/174_691198cd9af80.jpgPost 499124 http://datsun1200.com/uploads/newbb/174_691198d5cdcca.jpgPost 499124

A12 Original

H10 block castings Album 19179 11010-H2300 A12 BARE BLOCK 73mm/2.87" bore size * USA 11010-H2300 0570- ALL <> 11010-H1000 * USA 11010-H1000 -0470 * JPN 11010-H2300 GX, running change replaced <2,0> 11010-H1000 * JPN 11010-H1000 except GX

M08 block from 1970-1973 E10 Nissan Cherry X-1R A12T Album 2636 M15 E10 Cherry A12 single-carb

B110 A12 engine, five main bearing (so not interchangeable with A10 engine).

11010-H1000 JDM, USA -0470

- 13035-18001 ASSY-COVER TIMING CHAIN [single mark, pulley has multiple marks]

11010-H2300 GX, USA non-GX from 0570-

- 13035-H1000 ASSY-COVER TIMING CHAIN [multiple marks]

- [chain tensioner and bolts changed 0570]

M08 - Cherry A12T

http://datsun1200.com/uploads/newbb/174_67fefefdad6e1.jpgPost 498851 https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/M08.jpg

A12 GX

B110 A12GX Engine block is the same as standard block (same part number). It was fitted slightly differently, including:

Flat-top pistons

GX camshaft

extra connection on the Suction Pipe

Album 26361 Album 26362 Album 26360

A12 from 1974

1974 engine redesign (From October 1973), accessory mounts and engine mounts not compatible with earlier A12 engine.

More bolt holes for more accessories.

Engine mount bosses are 35 mm farther back (in photo, mount is forward, on accessories mounts)

Album 19202

AC compressor bracket bolt holes

Album 28304 Album 27774

Revised Block

Album 23474

Early Block

Album 23475

Dimension (late engine)

Album 25421

B210 JDM * 11010-H5000 * 11010-G1600 From June 1975 (?) * Both use 11110-H5000 PAN ASSY-OIL * Both use 13035-H1000 COVER-timing chain * Both use 11110-H5000 PAN ASSY-OIL

B120 JDM (from Oct 1975) * 11010-G1600 7510-7907 * 11010-G1618 7908-8503 11110-H5000 PAN ASSY-OIL 7510-8503 * 11010-G1619 8504- * 11110-G3401 PAN ASSY-OIL 8504-8910 * All use 13035-H1000 Timing Chain Cover ** 11110-H9701 PAN ASSY-OIL 8910-

B310 JDM * 11010-H5000 Van -7909 * 11010-H9460 Van 7910-8010 * 11010-H8500 Sedan, Coupe -8010 * 11010-H9463 Van 8011-8109, 8110- * All use 11110-H5000 PAN ASSY-OIL * All use 13035-H1000 or 13035-H1010 COVER-timing chain

H50 (1974 B210 A12) has only 2 accessory bolt bosses

Album 20516 https://img.photobucket.com/albums/a164/KB10/A12block.jpg

H10 A12 B110 etc. H72 A14 B210 etc. rear wheel drive M72 A14 N10 Front wheel drive H85 - B310 A12 H86 - A12A/A13 #M79 - A12

A12 with 3 accessory bolt bosses

https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/img_0.jpg

No drain plug (undrilled boss) Single drain plug

Dual drain plugs (M22? casting number)

Album 17799 Album 17797

H86 - A12A/A13

https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/LeftsideA13Block.jpg

G32?

Album 6107 Album 6109

New A12 has offset center core plug (same as original A12), but with two drain plug bosses

A14 has re-spaced center core plug and single drain plug boss

M22

A12 M22 F-2 block without 'M2' mark

http://datsun1200.com/uploads/photos/31391.jpgAlbum 31391

A12 block with 'M22' left side rear, and a large ^POST 'M2' cast mark on left side front

Upload click to view Album 25127

Apparently M2 indicates a factory replacement block. L-series, Z-series, KA-series and A-series were all available with blocks marked M2.

Cast 'M22' in the usual place, and cast 'A12' above the fuel pump boss

Upload click to view Upload click to view Upload click to view

A12 M22 block * Late model design (A Engine Redesign) * Twin drain plugs on left side * Late model scalloped crankshaft * ^POST reportedly has smaller-than-normal 25mm Welch Plugs on left side

Album 13814 Post 301649 Post 462282

M79

* single drain plug casting * dual drain plug casting

M79 may or may not be drilled and tapped for the second drain plug.

http://datsun1200.com/uploads/photos/30689.jpgAlbum 30689 http://datsun1200.com/uploads/photos/30690.jpgAlbum 30690

Single drain plug

http://datsun1200.com/uploads/photos/30688.jpgAlbum 30688

no drain plug

Album 30687

H85

H85 is the B310 Sunny 1977-1980 A12A block with 75mm bore.

B310 CAN A12 B310 JPN Sedan, Coupe -1980.10

JDM B310 sedan and coupe after October 1980 used the #H86 block with slightly larger 76mm bore and was marked 'A13'.

identifying features * Block Code H85 * low deck height (like all A12) * ID pad is just below top of block is stamped 'A12' Post 495859

Post 495859 Post 495859 Post 495859 Post 495859 Post 495859

A12A

A12A debuted 1977 in Japan in sedan/coupe (but not wagon or van). 1978 in North America B310. The bore is 2mm larger than A12.

75mm/2.95" bore size

Album 6713

North America B310 * 11010-H8500 CAN 1278-0779 * 11010-H8502 CAN * 11010-H9001 CAN 0879- * 11010-H9960 USA 0879- * uses 11110-H5000 OIL PAN

JAPAN 11010-H8500 7712-8010

A13, 1980

For JDM B310 sedans & coupe, the A13S replaced the A12S November 1980. B310 vans kept using the A12. Not to be confused with TS 1300 engine, which was an overbored A12. A13 uses 76mm bore like the A15.

H86 BLOCK ASSY-CYLINDER 11010-H8660 A13S 8011-JAPAN B310

Album 15874 Album 7779 Album 5987

Tall Deck

Tall-deck engines have about 25cm between the bell housing section and the cylinder head.

Album 28768 Album 20446 http://datsun1200.com/uploads/photos/30359.jpgAlbum 30359

1974 A13

USA model B210 (HLB210) for 1974 came with unique pre-A14 tall block engine.

11010-H6200 [1974] A13 BARE BLOCK 73mm/2.87" bore size * 11110-H6200 ASSY-PAN OIL * 11110-H7200 ASSY-PAN OIL FOR SERVICE * 11110-H7201 ASSY-PAN OIL FOR SERVICE * Uses 13035-H1000 Timing Chain Cover

The A13 block looks similar to an A14, so check the stamp of the Engine ID Mark to see whether it says 'A13' or 'A14'.

Engine Type Stamp is below #4 spark plug, aft of distributor

Album 16699

A14

A14 debuted late 1974 for the 1975 model year.

North America B210 11010-H7200 B210 USA/CANADA * B210 USA uses Mid Sump oil pan * 11110-H6200 ASSY-PAN OIL -0275 * 11110-H7200 ASSY-PAN OIL 0375-0875 * 11110-H7201 ASSY-PAN OIL 0975- Uses 13035-H1000 Timing Chain Cover

North American B310 * 11010-H7200 -0779 USA, -1179 CAN * 11010-H9905 0879- USA [same as A15] * 11010-H9900 0879- USA * 11010-H9115 1279-0780 CAN 11110-H5000 OIL PAN [same as JDM B210 A12/A14]

A14 cast "A14" above fuel pump

H72

H72 Casting mark with "29027A03" cast mark

https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/IMGP9678.jpg https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/IMGP9679.jpg https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/IMGP1096.jpg

H72 with "28X23A01" cast mark

Post 469285

M72

M72 is Applied Model Code for F10. There appears to be no difference from #H72

Album 18237

A15

North America B310 * 11010-H9700 -0779 [different from A14] * 11010-H9905 0879- [cast mark 'G34', shared with A14] 11110-H9700 OIL PAN [this oil pan is unique to A15]

Nissan Competition * 11010-H9700 A14/A15 BARE BLOCK 76mm/2.99" bore size

Unkown casting, note the two vertical ribs on the back, above the bellhousing flange

http://datsun1200.com/uploads/photos/30359.jpgAlbum 30359 http://datsun1200.com/uploads/photos/30360.jpgAlbum 30360 http://datsun1200.com/uploads/photos/30361.jpgAlbum 30361 http://datsun1200.com/uploads/photos/30362.jpgAlbum 30362 http://datsun1200.com/uploads/photos/30363.jpgAlbum 30363