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Engine assembling

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I need help for the engine assembling! I have a Lotus Esprit Turbo '85 (type 910), and I need to know this: 



. -1) In how many kilos have to tighten the screws on the engine head?

. -2) In how many kilos have to tighten the crank bolts?

. -3) how many kilos have to tighten the screws of the crankshaft?

. -4) The set that the valves has to have (10, 15, 20, 25?)


When the mechanic will assemble the engine, he wants to screw the screws to the exact measurement of force (in kilos guess?) To avoid having oil loss problems.


Can anybody help me?


Thank you very much!!!

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It all depends on what specification the engine is. If the first letter of the engine identification number is C, then it's a European specification for 1980 onwards. In which case....


Valve clearances (cold) Inlet....... 0.13 to 0.18 mm

                                Exhaust....... 0.25 to 0.31 mm


Torque figures...I believe the new style Goetze head gasket comes with it's own instruction sheet. It is tightened to a specific torque figure, then had head nut is further tightened to a particular additional angular rotation. The original gasket type is torqued as follows:


Front and rear pair of nuts.....9.7 Kgf/m

Middle 3 pairs.........................10.4 Kgf/m 


Big ends are tightened to 11.6 to 11.9 Kgf/m (Be careful, these can if you have difficulty getting to the right figure

                                                                         make sure that the bolts aren't getting longer!)


Main bearing cradle......12mm threads tightened to 7.6 Kgf/m

                                       8mm threads tightened to 1.9 to 2.2 Kgf/m


All threads should be oiled.


I've taken these from the Service Notes....if you intend further work on the Esprit, a set of these is a must!!


Good Luck!!!

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