Nissan TD engine
The Nissan TD series is a series of diesel engines manufactured by Nissan. All TD-series engines are inline engines; most versions are four-cylinders aside from the six-cylinder TD42. They have cast iron blocks and crossflow heads, and have swirl-chamber injection. The valves are pushrod-actuated, and the engine has two valves per cylinder; the camshaft is driven by a set of gears. Of a simple, somewhat old-fashioned construction, the engines are generally durable if not very powerful.
Straight-four
TD23
The TD23 has a bore and stroke of and thus displaces. Its compression ratio is 22.0:1. It is the least common of the TD series engines, and ended production around 1995.;Outputs
- at 4300 rpm
- at 2200 rpm
TD25
The TD25's bore and stroke are, giving. Period reviewers referred to the unit as "thoroughly viceless" and "a bit bland". This engine was also used by JASO, the Japanese Automotive Standards Organization, for their diesel oil Detergency Test procedure from 1998 until 2009, by which time engine assemblies and parts were no longer available.- at 4300 rpm
- at 4300 rpm
- at 2200 rpm
- at 2200 rpm
It has been used in the 1990–present Nissan Cedric YPY31, the Nissan Navara D21 series, and the 1-ton Nissan Atlas F23 series from 1995 to 1999. It was also used in the Nissan Caravan/Urvan.
TD27
Bore and stroke are giving. Maximum power of the naturally aspirated model is at 4,300 rpm. A turbocharged version of the TD27 was introduced in 1988. A low output version of this engine intended for forklift use, producing at 2,300 rpm, remained in production with GCT as of 2024.This engine was also exported to the United Kingdom and fitted to LTI's Fairway series, coupled to manual or automatic transmissions also supplied by Nissan. The low-stressed naturally aspirated engine has a strong reputation for reliability. The General Secretary of Britain's Licensed Taxi Drivers' Association referred to the TD27 as "one of the greatest engines ever put in a cab." It was chosen after extensive testing by engineering consultants Ricardo PLC. The company offset the cost of importing engines from Japan by Nissan agreeing to sell 200 Fairways in Japan every year under the "Big Ben" name. The TD27 continued to be installed on the succeeding TX1 series.
The TD27 was mainly fitted to a number of Nissan light duty commercial vehicles and was used as the most common diesel option in Nissan Homy, Caravan, and Urvan vans. Along with the TD23 and TD25, it was also fitted to the D21 series Datsun Truck. The turbocharged versions were also fitted to the Nissan Caravan and its various rebadgings, to the Nissan/Datsun Pickup, the Nissan Terrano SUV, and to the Nissan Terrano II.
The power range of the regular turbocharged versions range from depending on fitment; when fitted with an intercooler power increases to. The most powerful TD27ETi model, introduced in 1995 and built until 2001, is intercooled, and has an electronically controlled distributor-type fuel injection pump. The system was called "electronically controlled fuel injection" by Nissan at the time.
Straight-six
TD42
The TD42 has been in production since July 1987. It displaces ; it's a square engine and the bore and stroke are. Its fuel-injection pump is mechanically controlled. Early models have a silver cylinder head cover, while turbocharged TD42s and naturally aspirated ones built after 1995 are black. Since 1988, Nissan Diesel Industrial Engines also manufactured this model for use in forklifts; the company building these changed name to Nissan Industrial Engine Manufacturing in 1995 and became Global Component Technologies in 2015. This low output version produces at 2,400 rpm and was still in production as of 2024. Old-fashioned but beloved for its ruggedness and reliability, the TD42 is not particularly fuel efficient and may be subject to cooling issues when not properly maintained.The naturally aspirated versions of the TD42 produce from depending on market, fitment, and measuring methods. It has been installed in the Nissan Civilian series since 1988 and the Nissan Safari/Patrol. Original engines were fitted with 28 mm gudgeon pins whilst from 08/1996 onwards, Nissan fitted 30 mm pins. The rear seal also changed from a conventional style to a unitized style around September 1997.