Series Land Rover (Australia & NZ)
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Last Updated
1/6/09

Torque Settings: Series II & III Land Rover Engines

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

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