Mon Mar 17 08:52:46 1997 - Message No. 507
From: Pierre DEBRAS

Subject: Re: Valve adjustment, how to do it?


>> It's time for valve adjustment. I have a '93 Benetton Green 11.000km.
>> 
>> I have removed the fuel tank, and then...? Do i need to bye spearparts
>> (gaskets) for this jobb? How big is the valve clearens?
>> 
>> Thanks for help.
>> Stig.Solstad@bibsent.no
>> 
Hu Stig and others,

Valve clearance should be something like 0.15?? for intake and 0.20?? for
exhaust. I'll check the exact values for tomorrow. Two covers on each
cylinder head give access to the valves adjustment. You don't need to
change the gasket but be sure to tighthen the covers screws VERY LIGHTLY.

TWO THINGS YOU NEED TO KNOW: the first one may be obvious: you must set
the cyl for which you adjust valves to top/end compression. That means
that TL (top left) or TR (top right) markers on the engine "wheel" must
align with the mark on the crankcase AND you must feel the freeplay on the
valve (otherwise means that you're at top, end exhaust). Remember:
4-strokes = 2 revs ! If you don't understand this paragraph, you should
not proceed to valve-adjustment yourself!!

The second thing is: not enough clearance (=> burn valves) is even worst
than too much clearance. Also, a (very) wrong adjustment of the valves may
damage (seriously) your engine.

Pierre



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dipper@normans.isd.uni-stuttgart.de