The A14 engine is the most common A-series engine available in the US, although in some other markets it is relatively rare due to continued use of A12 engines through 1994. It features a lightweight cast iron block with combustion in fully open wedge shape. chambers, aluminum cylinder head and fully balanced five-bearing crankshaft.
Like the previous 1974 A13, the A14 engine is a “high block” variant with the block spring 15mm higher than the A12. The bore and stroke were 76.0mm (increased from 73mm on A12 and A13) and 77.0mm (same with A13), respectively. The compression ratio ratio was 8.5: 1.
The A14 was produced in various powers from 50 HP (37 kW) to 92 HP (68 kW).
In some markets the engine was available with Hitachi Twin Carb, this version was called A14T. The A14E engine with Electronic Port Fuel Injection was offered in Asian markets. Since 2002, the new A14S has been available for Nissan commercial vehicles, such as forklifts. The Nissan Sunny B140 variant, with the A14 engine, was manufactured until 2008 by Nissan South Africa as the Nissan LDV 1400 (Light Delivery Vehicle).
The engine code breakdown is as follows:
- TO – Engine family
- 14 – 1.4 liters of displacement
- S – Carburettor type
|Design||Four-stroke, Inline-4 (Straight-4)|
|Fuel type||Gasoline (gasoline)|
|Displacement||1.4 L, 1,397 cc (85.24 cu in)|
|Fuel system||Carburettor type|
|Power output||50 HP (37 kW) at 5,000 rpm to 92 HP (68 kW) at 6,000 rpm|
|Order to open fire||1-3-4-2|
|Dimensions (L x W x H):||–|
The A14 has a cylinder block in a special one-piece cast iron structure with a five-bearing support system. The engine is equipped with a baffle plate and a steel net to reduce oil consumption. The cylinder bore is 76.0 mm (2.992 in) and the piston stroke is 77.0 mm (3.031 in).
The crankshaft is made of forged special steel and counterbalanced by forged weights integrally with the crankshaft. The main bearings are lubricated with oil holes that intersect the main oil gallery in parallel with the cylinder holes.
The pistons are of the aluminum alloy sliding skirt type. The A14 engine has two compression and oil control rings. Piston pins are special types of hollow steel that connect to the piston by a full floating fit and to the connecting rods by a press fit. The connecting rods are made of forged steel. Full pressure lubrication is directed to the connecting rods through oil passages drilled from the journal of adjacent main bearings. The oil holes are the connecting rod trunnions that are located so that oil is supplied to provide maximum full load lubrication of the bearing.
|Cylinder Block Alloy||Molten iron|
|Compression ratio:||8.5: 1-9.0: 1 (Depends on country and vehicle model)|
|Cylinder bore:||76.0 mm (2,992 inches))|
|Piston stroke:||77.0 mm (3.031 inches)|
|Number of piston rings (compression / oil):||2/1|
|Number of main bearings:||5|
|Cylinder bore (standard):||76,000-76,050 mm (2.9921-2.9941 inches)|
|Piston Skirt Diameter (Standard):||75.967-75.017 mm (2.9908-2.9927 inches)|
|Piston Pin Outside Diameter:||18.995-19.000 mm (0.747-0.748 inches)|
|Piston ring side clearance:||Top||0.040 – 0.070 mm (0.0016 – 0.0028 inch)|
|Second||0.030 – 0.060 mm (0.0012 – 0.0024 inch)|
|Piston Ring End Gap:||Top||0.20 – 0.35 mm (0.0079 – 0.0138 inch)|
|Second||0.15 – 0.30 mm (0.0059 – 0.0118 inch)|
|Petroleum||0.30 – 0.90 mm (0.0118 – 0.0354 inch)|
|Crankshaft journal diameter:||49,951 – 49,964 (1,9666 – 1,9671)|
|Crankpin diameter:||44,961 – 44,974 (1,7701 – 1,7706)|
The cylinder head is made of a light and strong aluminum alloy, which gives it good cooling efficiency. A special aluminum bronze valve seat is used in the intake valve, while a sintered iron alloy is used in the exhaust valve. These parts are hot press fit. It is provided…