The Toyota K series is an inline-four engine that was produced from 1966 through 2007. It is a two-valve pushrod engine design. It was originally built from the Toyota Kamigo plant in Toyota City factory in Japan.
All K series are non-crossflow engines – the inlet and exhaust manifolds are on the same side. They have cast iron blocks and aluminium alloy heads, with a crankshaft supported by five main bearings. K series motors have both hydraulic tappet or hydraulic valve lifters, solid lifters and 1.5 ratio rockers with an adjustment thread for tappet clearance. 7K engines were released with only the hydraulic valve lifters from factory, whereas 4K and 5K engines were made with both hydraulic and solid lifters (depending on year and which model vehicle.)
K
The 8-valve OHV K was produced from 1966 through 1969. A similar K-B was produced from 1968 through 1969, the -B designates twin carburettors. Thus equipped, the engine produces at 6600 rpm. The Publica SL received this more powerful version.
Applications: Toyota Corolla (KE1x) Toyota Publica (KP3x)
2K The eight-valve OHV 2K was produced from 1969 through 1988. The cylinder bore and stroke was .
Output in 1978 was at 5800 rpm, and at 3800 rpm. In 1983, New Zealand received a version with at 5800 rpm, while Europe received a version with at 5600 rpm, both with a maximum torque of at 4000 rpm.
Applications: Toyota Publica/1000 (KP30/KP36) Toyota Starlet
3K
The eight-valve overhead valve 3K was produced from 1969 through 1977. Cylinder bore and stroke was .
The 1969 through 1975 3K-B was a twin-carburetor version. The California-spec 3K-C (1977–1979) and 3K-H were other available versions.
Applications Toyota Corolla (E10) Toyota Corolla (E20) Toyota Corolla (E30) Toyota Kijang/first generation Toyota Tamaraw Toyota LiteAce (KM10) Toyota Publica (later pickups and vans received the desmogged 3K-HJ engine) Toyota Starlet Toyota TownAce (KR10) Daihatsu Charmant (A10) Daihatsu Delta 750 (KB10)
Specifications (outputs are JIS unless otherwise noted) Code PS kW HP at rpm kgm Nm lb-ft at rpm Compr. Ratio Comments 3K 6000 3800 9.0:1 6300 3900 (DIN) 6000 3800 Export (SAE gross) 3K-B 6600 4600 10.0:1 Twin carburettors, high octane 6200 4000 (DIN) 6600 4600 Export (SAE gross) 3K-BR 6600 4600 9.0:1 As 3K-B but for regular octane 3K-C 5800 3800 California emissions controls (SAE net) 3K-D 6600 4200 10.0:1 High compression, single carburettor 3K-H 6000 4200 9.0:1 High octane 6000 3800 (DIN) 3K-J 5800 3600 Japanese emission controls for commercial vehicles 3K-HJ 5800 3600 Japanese emission controls for commercial vehicles (Publica Van/Pickup, Starlet Van) 3K-U 5800 3600 Japanese emission controls (TTC-C) ("Toyota Total Clean-Catalyst") 3K-R 9000 8200 13.0:1 TRD Racing circuit engine
3K-R The 3K-R engine, also known as the 137E, was a special version of the standard 3K fitted to the Toyota Starlet (KP40) for use in touring car racing in Japan. In August 1972, the JAF made a rule change which allowed manuafacturers to change the valvetrain design of an engine, with a minimum annual production of 50 engines. Toyota, Yamaha, and TOM'S immediately developed a 16-valve version of the 3K-R engine. The 3K-R has a 16-valve, dual overhead camshaft cylinder head with a compression reatio of 13:1 and was fuelled by a Nippon Denso built mechanical fuel injection system. The engine was also bored out to 1.3 L (1293 cc) and had a dry sump oil system. The engine produced around at 9,000 rpm.
4K
The 4K was produced from 1977 through 1989. Cylinder bore and stroke was . It was an 8-valve OHV engine.
In 1980, the 4K produced at 5250 rpm. From 1983 through 1984, output was at 5600 rpm and at 3600 rpm.
The 1981 and 1982 California-spec 4K-C produced at 5200 rpm and at 3600 rpm. Torque was up to at 3400 rpm for the fuel injected 1982 through 1984 4K-E. The Japan-spec 4K-U produced at 5600 rpm and at 3600 rpm in 1982. Available in hydraulic and solid lifter configurations
Applications: Toyota Corolla (E70) Toyota Kijang Toyota Liteace Toyota Starlet Daihatsu Charmant 1977–1979 Daihatsu Delta 750 (KD11)
5K
The 5K was produced from 1983 through 1996. Typical output is at 5600 rpm. Bore and stroke is . It was available with either 4- or 5-speed manual transmissions. Like the smaller 4K model, it uses hydraulic lifters as well as solid lifters for the pushrod.
Applications: 1983.08-1987.10 Toyota Carina Van (KA67V 'Van') 5K-J 1983.05-1987.08 Toyota Corolla Van (KE74V) 5K-J 1983.10-1987.12 Toyota Corona Van (KT147V 'Van') 5K-J, at 5,200 rpmList of RT140 Coronas sold in Japan. Toyota Motor Co., No. 261150 Toyota Liteace KR27 Van Toyota Liteace KM36 Van at 4800 rpm, at 3200 rpm Toyota Kijang/Tamaraw Toyota TownAce KR41 Van Toyota Forklift (late 1980s-early 1990s model)
7K
The 7K was first introduced in 1983. Cylinder bore and stroke was . Output was at 4600 rpm and at 2800 rpm while the EFI version which can be found in Toyota Kijang KF80 produces at 4600 rpm and at 3200 rpm. The Engine was available with a 5 speed manual & 4 speed automatic transmission. Available in both fuel injected and carburetted configurations, the 7K produces much more power and torque compared to the other K engines however it is a lot less 'rev happy' due to having such a long stroke.
7K-E is available in KR42 Townace SBV vans (1997–2007) using a large G52 5 speed gearbox (same bellhousing to box pattern as W55), or automatic.
Applications: Toyota Kijang/Tamaraw FX/Revo Toyota LiteAce/TownAce
References
See also List of Toyota engines Toyota K transmission