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Last Updated
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Torque Settings: Series II & III Land Rover Engines

Torque wrench

Bolts hold the various parts of any Series Land Rover engine together and they do this by friction only, nothing else. If you tighten the bolt down more, then the surfaces come more closely into contact and friction is greater. It is the threads which carry the frictional stress and if they are stressed too much then they can shear, thus lessening friction and increasing the chance of the bolt losing grip. Hence the use of the toque wrench to control the stress on the threads.
The workshop manuals for Series Land Rover engines will give torque wrench settings for the most critical bolt fastenings. Generally speaking, the larger the diameter of the bolt and the finer the thread then the more torque the bolts can take without overstressing the thread.
The length of a spanner is generally proportional to the amount of stress that should be applied to that particular size bolt. You cannot exert the required torque with an ordinary length spanner for the cylinderhead bolts, but an extension bar should not be used because you cannot gauge the stress you are imposing. Torque wrenches capable of 100+Nm are longer than equivalent spanners to facilitate their effective use.

Component
2.25litre Diesel Torque
 
2.25litre Petrol
Torque
 
2.6litre Petrol
Torque
 
lbf ft
Nm
kgf m
 
lbf ft
Nm
kgf m
 
lbf ft
Nm
kgf m
Con rod cap nuts
25
35
3.5
 
25*
35*
3.5*
 
20
27
2.7
Main bearing cap bolts
100
138
13.8
 
85
115
11.5
 
75
100
10
Cylinderhead bolts 1/2in UNF
90
125
12.5
 
65
89
8.9
 
50**
68**
6.8**
Rocker shaft bolts 5/16in UNF
18
24
2.4
 
18
24
2.4
       
Rocker shaft bolts 1/2in UNF
90
125
12.5
 
65
89
8.9
       
Crankshaft pulley
150
205
20.5
 
150
205
20.5
 
200
270
27
Flywheel bolts
65
90
9.0
 
65
90
8.9
 
65
90
8.9
camshaft sprocket bolt
30
41
4.1
 
30
41
4.15
       
Clutch housing bolts
25
35
3.5
 
25
35
3.5
 
25
35
3.5

* If the con rod cap bolts have the threaded part the same diameter as the plain bolt shank then the torque should be 35lbf ft (48Nm, 4.8kgf m)
** Apart from a row of six 3/8in UNF bolts, the remaining cylinderhead bolts for the 2.6litre engine are 7/16in dia. UNF. The six smaller bolts should be torqued to 30lbf ft (41Nm, 4.1kgf m)


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