Toyota K engine

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The Toyota K series was a straight-4 engine produced from 1966 through 2007. It was a 2-valve pushrod engine design, a rarity for the company.

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 5 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[edit]

1966 Toyota K engine.

The 8-valve OHV 1.1 L (1,077 cc) 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 73 PS (54 kW) at 6,600 rpm.[1] The Publica SL received this more powerful version.

Applications:

2K[edit]

The 8-valve OHV 1.0 L (993 cc) 2K was produced from 1969 through 1988. Cylinder bore was 72 mm and stroke was 61 mm.

Output in 1978 was 47 hp (35 kW) at 5,800 rpm, and 66 N·m at 3,800 rpm.[2] In 1984, the equivalent was 49 hp (36 kW) at 5,600 rpm and 49 lb·ft (66 N·m) at 4,000 rpm.

Applications:

3K[edit]

Toyota 3K engine.

The eight-valve overhead valve 1.2 L (1,166 cc) 3K was produced from 1969 through 1977. Cylinder bore was 75 mm (2.95 in) and stroke was 66 mm (2.6 in).

The 1969 through 1975 3K-B was a twin-carb version. The California-spec 3K-C (1977–1979) and 3K-H were other available versions.

Applications
Specifications
Code PS (kW) at rpm kgm (Nm) (lb.ft) at rpm compression Years Comments
3K 68 50 6000 9.5 93 69 3800 9.0
55 40 (DIN)
3K-B 77 57 6600 9.6 94 69 4600 10.0 Twin carburettors, high octane
64 47 6200 9.0 88 65 4000 (DIN)
3K-BR 74 54 6600 9.5 93 69 4600 9.0 As 3K-B but for regular octane
3K-C 59 43 5800 8.7 85 63 3800 9.0 California emissions controls (SAE net)
3K-D 73 54 6600 9.6 94 69 4200 10.0 High compression, single carburettor
3K-H 71 52 6000 9.7 95 70 4200 9.0 High octane
56 41 6000 8.5 83 61 3800 (DIN)
3K-J[3] 64 47 5800 9.2 90 67 3600 9.0 Japanese emission controls for commercial vehicles
3K-HJ[3] 67 49 5800 9.4 92 68 3600 9.0 Japanese emission controls for commercial vehicles (Publica Van/Pickup, Starlet Van)
3K-U[3] 64 47 5800 9.2 90 67 3600 9.0 Japanese emission controls (TTC-C) ("Toyota Total Clean-Catalyst")

4K[edit]

The 1.3 L (1,290 cc) 4K was produced from 1977 through 1989. Cylinder bore was 75 mm (2.95 in) and stroke was 73 mm (2.87 in). It was an 8-valve OHV engine.

In 1980, the 4K produced 58 hp (41 kW) at 5250 rpm. From 1983 through 1984, output was 62 hp (46 kW) at 5600 rpm and 72 lb·ft (97 N·m) at 3600 rpm.

The 1981 and 1982 California-spec 4K-C produced 58 hp (43 kW) at 5200 rpm and 67 lb·ft (90 Nm) at 3600 rpm. Torque was up to 74 lb·ft (100 N·m) at 3400 rpm for the fuel injected 1982 through 1984 4K-E. The Japan-spec 4K-U produced 74 hp (55 kW) at 5600 rpm and 78 lb·ft (105 N·m) at 3600 rpm in 1982. Available in hydraulic and solid lifter configurations

Applications:

5K[edit]

Toyota 5K-C engine in a 1991 Liteace

The 1.5 L (1,486 cc) 5K was produced from 1983 through 1996. Bore is 80,5 mm, stroke is 73.0 mm. Like the smaller 4K motor, it uses hydraulic lifters as well as solid (pushrod) lifters.

Applications:

7K[edit]

The 1.8 L (1,781 cc) 7K was first introduced in 1983. Cylinder bore was 80.5 mm (3.17 in) and stroke was 87.5 mm (3.44 in). Output was 80 hp (60 kW) at 4600 RPM and 103 lb·ft (139 N·m) at 2800  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 large stroke.

7K 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:

References[edit]

  1. ^ "2代目 パブリカ" [Second generation Publica]. トヨタ自動車75年史 [75 years of Toyota history] (in Japanese). Toyota Motor Co. 
  2. ^ Tekniikan Maailma magazine (in Finnish) (#15). 1978. 
  3. ^ a b c トヨタオート [Toyota Auto] (catalog) (in Japanese), Toyota, June 1977, p. 13, 041183-5206 
  4. ^ "5th Corolla Van". 75 years of history: Vehicle lineage. Toyota. Retrieved 2013-11-16. 
  5. ^ List of RT140 Coronas sold in Japan. Toyota Motor Co., No. 261150
  6. ^ New Corona Van (Catalog), Japan: Toyota Motor Corporation, August 1985, No.121131-6008 

See also[edit]