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Head bolts torque in ft/lbs 95 xjs 4.0 would be appricated. Thanks for your help

XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

Head bolts torque in ft/lbs 95 xjs 4.0 would be appricated. Thanks for your help

 
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Old 05-09-2019, 10:50 AM
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Default Head bolts torque in ft/lbs 95 xjs 4.0 would be appricated. Thanks for your help

 
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Old 05-09-2019, 01:18 PM
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AJ16 Engine 4.0

59-61Nm + 90 degrees (SPS Joint Control System) You will need to do the math to convert from Newton Meters.

2. SERVICE PROCEDURES2.1 SPS Joint Control System A feature of the engine is the use of the SPS joint control system on the cylinder head bolts, crankshaft main bearing bolts and connecting rod bearing nuts and bolts. This system ensures that the joints receive maximum clamp loading for a given fixing size and type of material by tightening the fixing to its particular yield point. This greatly helps to prevent premature cylinder head gasket failures. All SPS fixings must be used only once. Discard fixings on removal and replace with new bolts/nuts every time a `strip down' has been carried out.The SPS system in service requires the fixing to be set to a specific torque initially; it must then be rotated through 90 degrees exactly. The accuracy of this cannot be too highly stressed. To obtain the correct setting, use Special Tool LST 122, or a self-manufactured tool using the dimensions illustrated (Fig. 1).See Torque Tightening Specifications in the Preliminary Pages for the correct torque figures.

Be aware that a later TSB (03-1-13A) authorized the re-use of some bolts.
There is debate over this practice.

bob
 
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Old 05-09-2019, 07:06 PM
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Default 95 xjs head bolt torque.

I just want to check the torque. Not replacing any bolts. Why rotate. Won't that increase the torque?
 
 
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