Technical data of engine overhaul [Toyota 4Runner N120]

4-cylinder engines 2.4 and 2.7 l

All dimensions and clearances are in mm.

Compression (at 250 rpm):
- standard	11.7 kgf/cm²
- the limit	8.4 kgf/cm²
– the greatest difference in compression in the cylinders	1.9 kgf/cm²
Oil pressure:
- at idle (600 rpm)	not less than 0.25 kgf/cm²
– at 3000 rpm	2.1 – 4.3 kgf/cm²
Cylinder block
Maximum permissible deformation of the split plane	0.05 mm
Inner diameter of cylinder:
- standard	94,900 – 95,003
- ultimate	95,06
- taper and ovality	no more than 0.025
Cylinder head and valves
Maximum permissible deformation of the split plane	0.05 mm
Valve head belt width (standard):
- intake	1,0
- graduation	1,0
Valve head belt width (ultimate):
- intake	0,5
- graduation	0,5
Rod diameter:
- inlet	5,970 – 5,985
- graduation	5,965 – 5,980
Clearance between valve stem and guide bushing
- standard:
• inlet	0,025 – 0,060
• graduation	0,030 – 0,065
- limit:
• inlet	0,08
• inlet	0,10
Valve spring length
- in a free state	43,94 – 45,06
- in the established	37,5
Crankshaft and connecting rods
Connecting rod journals:
- diameter	52,987 – 53,000
- clearance in connecting rod bearings	0,030 – 0,055
Axial clearance of connecting rods:
- standard	0,160 – 0,312
- ultimate	0,35
Root necks 1,2,4 and 5:
- diameter	59,987 – 60,000
- clearance in bearings	0,024 – 0,049
Neck 3
- diameter	59,981 – 59,994
- gap	0,030 – 0,055
Crankshaft axial clearance:
- standard	0,020 – 0,22
- ultimate	0,30
Ovality and taper	no more than 0.005
Pistons and rings
Piston diameter (standard):
– 2.4 l	94,923 – 94,933
– 2.7 l	94,933 – 94,943
Clearance between piston and cylinder:
– 2.4 l	0,057 – 0,080
– 2.7 l	0,047 – 0,70
Piston ring joint clearance:
- ring N1 (upper compression):
• standard	0,300 – 0,400
• ultimate	0,40
- ring N₂ (lower compression):
• standard with the "T" mark	0,400 – 0,500
• standard with the "N" mark	0,400 – 0,500
• ultimate	0,50
Clearance between ring and groove in piston:
- ring N1 (upper compression):
• standard	0,020 – 0,070
• ultimate	0,070
- ring N₂ (lower compression):
• standard	0,030 – 0,070
• ultimate	0,070
Balance shafts
Axial clearance:
- standard	0,07 – 0,13
- ultimate	0,2

Tightening torques (Nm)*

Crankshaft oil injectors	15
Balance shaft cover bolts	16
Balance shaft gear bolt	22
Balance shaft tensioner nut	16
N3 damper bolts	16
N₂ damper bolts	25
Main bearing cap bolts:
- Stage 1	36
- 2nd stage	turn 90°
Connecting rod bearing cap nuts:
- Stage 1	40
- 2nd stage	turn 90°

* see also subsection 3.1.1.

6-cylinder engines with a volume of 3.0 and 3.4 liters

The data in brackets is for a 3.4L engine, all dimensions and clearances are in mm.

Compression (at 250 rpm)
- standard	11.2 kgf/cm² (14)
- the limit	9.2 kgf/cm² (9.5)
Oil pressure (on a warm engine):
– at 3000 rpm	2.3 – 4.4 kgf/cm² (2.3 – 4.4)
- at idle	not less than 0.25 kgf/cm² (not less than 0.25)
Cylinder head and valves
Maximum permissible deformation of the split plane	0,10 (0,10)
Valve mechanism
Valve head belt width:
- standard	1,5
- the limit	1,3
Rod diameter:
- inlet	7,970 – 7,985 (5,970 – 5,985)
- graduation	7,965 – 7,980 (5,965 – 5,980)
Clearance between valve stem and guide bushing:
– inlet:
• standard	0,025 – 0,060 (0,025 – 0,060)
• ultimate	0,08 (0,08)
- graduation:
• standard	0,030 – 0,065 (0,030 – 0,065)
• ultimate	0,10 (0,10)
Valve spring:
- deviation from the vertical	1,23 (2,0)
– length in free state	47,01 (44,78)
– length in installed state	40,0 (33,3)
Pushers:
Outer diameter	37,922 – 37,932 (30,966 – 30,976)
Clearance in tappets	37,960 – 37,975 (31,000 – 31,018)
- standard	0,028 – 0,053 (0,024 – 0,052)
- ultimate	0,10 (0,08)
Crankshaft and connecting rods
Connecting rod journals:
- diameter	54,987 – 55,000 (54,987 – 55,000)
- ovality and taper	0,02 (0,02)
Clearance in connecting rod bearings:
- standard	0,024 – 0,053 (0,020 – 0,038)
- ultimate	0,08 (0,08)
Axial clearance of connecting rods:
- standard	0,15 – 0,33 (0,150 – 0,330)
- ultimate	0,38 (0,38)
Root necks:
- diameter	63,996 – 64,000 (63,985 – 64,000)
- ovality and taper	0,02 (0,02)
Main bearing clearance:
- standard	0,024 – 0,042 (in the N1 neck 0.020 – 0.038, in the other necks 0.024 – 0.042)
- limit, 0.08	(in neck N1 0.08, in other necks 0.08)
Crankshaft axial clearance:
- standard	2,44 – 2,49 (0,020 – 0,220)
- ultimate	0,30 (0,30)
Thrust washer thickness	2.44 – 2.49 (up to 0.038)
Cylinder block
Deformation of the split plane	0,05 (0,05)
Inner diameter of the cylinder (standard):
- group 1	87,500 – 87,510 (93,500 – 93,510)
- group 2	87,511 – 87,520 (93,510 – 93,520)
- group 3	87,521 – 87,530 (93,520 – 93,530)
Pistons and rings
Piston diameter (standard):
- group 1	87,360 – 87,370 (93,356 – 93,366)
- group 2	87,370 – 87,380 (93,367 – 93,376)
- group 3	87,381 – 87,390 (93,377 – 93,386)
Clearance between piston and cylinder:
- standard	0,13 – 0,15 (0,134 – 0,154)
- ultimate	0,17 (0,174)
Piston ring joint clearance:
- ring N1 (upper compression):
• standard	0,23 – 0,33 (0,30 – 0,50)
• ultimate	0,83 (1,10)
- ring N₂ (lower compression):
• standard	0,38 – 0,48 (0,40 – 0,60)
• ultimate	0,90 (1,20)
– oil scraper ring:
• standard	0,15 – 0,40 (0,15 – 0,55)
• ultimate	0,90 (1,20)
Clearance between ring and groove in piston:
– 3.0 l engines before 1993:
• standard	0,03 – 0,07
• ultimate	0,20
– 3.0 l engines 1994:
• ring N1 (upper compression)	0,02 – 0,06
• ring N₂ (lower compression)	0,03 – 0,07
• ultimate (for both rings)	0,20
– 3.4 l engines:
• ring N1 (upper compression)	0,04 – 0,08
• ring N₂ (lower compression)	0,03 – 0,07
• ultimate (for both rings)	0,20

Tightening torques (Nm)*

Main bearing cap bolts:
- Stage 1	54 (54)
- 2nd stage	turn 90°(90°)
Connecting rod cap nuts:
- Stage 1	22 (22)
- 2nd stage	turn 90°(90°)

* see also subsection 3.2.1.