| Toyota K engine | |
| Manufacturer: | Toyota |
| Production: | 1966 - 2007 |
| Configuration: | Naturally aspirated straight-four |
| Valvetrain: | OHV 2 valves per cylinder |
| Timing: | Timing chain |
| Block: | Cast iron |
| Head: | Aluminium alloy |
| Fuelsystem: | Carburettor Multi-port fuel injection |
| Fueltype: | Petrol |
| Oilsystem: | Wet sump |
| Coolingsystem: | Water-cooled |
| Power: | NaNPS |
| Torque: | NaNNm |
| Successor: | Toyota E engine (up to 1.3 L models) |
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.)
The 8-valve OHV 1077cc 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 730NaN0 at 6600 rpm.[1] The Publica SL received this more powerful version.
Applications:
The eight-valve OHV 993cc 2K was produced from 1969 through 1988. The cylinder bore and stroke was NaNmm.
Output in 1978 was 47hp at 5800 rpm, and 6.70NaN0 at 3800 rpm.[2] In 1983, New Zealand received a version with 400NaN0 at 5800 rpm, while Europe received a version with 330NaN0 at 5600 rpm, both with a maximum torque of 6.7abbr=on0abbr=on at 4000 rpm.
Applications:
The eight-valve overhead valve 1166cc 3K was produced from 1969 through 1977. Cylinder bore and stroke was NaN2NaN2.
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.
| Code | PS | kW | HP | at rpm | kgm | Nm | lb-ft | at rpm | Compr. Ratio | Comments |
|---|---|---|---|---|---|---|---|---|---|---|
| 3K | 680NaN0 | 6000 | 9.50NaN0 | 3800 | 9.0:1 | |||||
| 580NaN0 | 6300 | 8.10NaN0 | 3900 | (DIN) | ||||||
| 73hp | 6000 | 10.30NaN0 | 3800 | Export (SAE gross) | ||||||
| 3K-B | 770NaN0 | 6600 | 9.60NaN0 | 4600 | 10.0:1 | Twin carburettors, high octane | ||||
| 640NaN0 | 6200 | 90NaN0 | 4000 | (DIN) | ||||||
| 83hp | 6600 | 10.40NaN0 | 4600 | Export (SAE gross) | ||||||
| 3K-BR | 740NaN0 | 6600 | 9.50NaN0 | 4600 | 9.0:1 | As 3K-B but for regular octane | ||||
| 3K-C | 590NaN0 | 5800 | 8.70NaN0 | 3800 | California emissions controls (SAE net) | |||||
| 3K-D | 730NaN0 | 6600 | 9.60NaN0 | 4200 | 10.0:1 | High compression, single carburettor | ||||
| 3K-H | 710NaN0 | 6000 | 9.70NaN0 | 4200 | 9.0:1 | High octane | ||||
| 550NaN0 | 6000 | 8.50NaN0 | 3800 | (DIN) | ||||||
| 3K-J | 640NaN0 | 5800 | 9.20NaN0 | 3600 | Japanese emission controls for commercial vehicles | |||||
| 3K-HJ | 670NaN0 | 5800 | 9.40NaN0 | 3600 | Japanese emission controls for commercial vehicles (Publica Van/Pickup, Starlet Van) | |||||
| 3K-U | 640NaN0 | 5800 | 9.20NaN0 | 3600 | Japanese emission controls (TTC-C) ("Toyota Total Clean-Catalyst") | |||||
| 3K-R | 1830NaN0 | 9000 | 19.60NaN0 | 8200 | 13.0:1 | TRD Racing circuit engine |
The 1290cc 4K was produced from 1977 through 1989. Cylinder bore and stroke was NaN2NaN2. It was an 8-valve OHV engine.
In 1980, the 4K produced 58hp at 5250 rpm. From 1983 through 1984, output was 62hp at 5600 rpm and 9.90NaN0 at 3600 rpm.
The 1981 and 1982 California-spec 4K-C produced 58hp at 5200 rpm and 9.20NaN0 at 3600 rpm. Torque was up to 10.20NaN0 at 3400 rpm for the fuel injected 1982 through 1984 4K-E. The Japan-spec 4K-U produced 74hp at 5600 rpm and 10.70NaN0 at 3600 rpm in 1982. Available in hydraulic and solid lifter configurations
Applications:
The 1486cc 5K was produced from 1983 through 1996. Typical output is 74hp at 5600 rpm. Bore and stroke is NaNmm. 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:
The 1781cc 7K was first introduced in 1983. Cylinder bore and stroke was NaN2NaN2. Output was 80hp at 4600 rpm and 14.20NaN0 at 2800 rpm while the EFI version which can be found in Toyota Kijang KF80 produces 83hp at 4600 rpm and 150NaN0 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:
