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Valve timing / clearance - Engine/Ancilliaries - The Lotus Forums Jump to content

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Hi to all!

Can anyone help me with instructions how to check valve timing / clearance on my turbo SE, year 90?

If valve timing / clearance is not ok, how to adjust it?

Thanks in advance!


LOTUS Esprit Turbo SE, 1990

P.U.K. racing turbo charger

ECU chip 1.1 bar

Motorsport racing fuel pump

RC racing High Flow secondary injectors

RC racing High Flow primary injectors

custom made titanium free flow exhaust

Electric CC pump

Double size Chargecooler, heavy duty version

Racing air filter


Crankcase Breather filter

Ram air converison

Uprated Valeo clutch with 25% more torque

KW85 HT leads, IW22 spark plugs

S4S wheels, front mask, rear spoiler

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The best answer i can give you is not to do it yourself

you'll have to be a bit of a mechanic

if your not don't touch it and give it to a specialist

have the timing belt done too

these things have to be checked and replaced every 30.000 km

researche is something i do when i don't know what the hell i'm doing

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Checking and adjusting the valve clearances is detailed (with diagrams) in

the Service Manual in Section EB.

The clearances should be checked when the Engine is cold.

Clearances should be :-

Inlet Valves 0.13 - 0.18mm (0.005 - 0.007 in)

Exhaust valves 0.25 - 0.31mm (0.010 - 0.012 in)

If you needs to adjust valve clearances he will need new shims and reset the

belt tension to 95 Burroughs units on the Lotus / Burroughs Gauge (also

detailed in the Lotus Service notes. You will also need the proper adhesive for the cam housings if they need to come apart.

I think you should invest in a copy of the Lotus Service Notes

It would also be useful to carry out a compression test.

Figures should be 9.5 bar (140 lb/in2) minimum

It is also important that he is using a good quality synthetic oil in the engine (Castrol RS 10W60 / Mobil 1 5W50 or 15W50)


Lotus Esprit World


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