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With a special tool called a feeler gauge remove the valve covers and one by one bring the cylinders up to top dead center (both valves are fully closed at this point) adjust to factory spec. All adjustments are done cold. If engine is very high miles reduce the clearances in specs by slight amount (.002") to the tight side to account for wear in the valve train parts.
First of all, make sure it has tappets. In our country, Toyota Conquests have overhead camshafts, which means they don't have tappets. The camshafts drive the valves down with cam followers - these are metal caps on the valves that run directly against the cams. These caps are either self-adjusted hydraulically, or set by inserting shims inside the caps.
just mere thousanths the patrs store has specs on valve clearances..I assume its an overhead cam ..you can sometimes adjust while its in idle..run the tappets out until that cylinder misses.. then adjust back enough for it to run smooth..
If you have adjustable tappets bring the engine to top dead center no 1 piston firing The rocker will be on the back of the cam lobes. Inlet .010" hot exhaust .012" hot and then turn until next firing piston is in position. Go by firing order. I suspect that a 1997 model would have hydraulic adjusted tappets which means no manual adjustment. If it is rattlly I would be checking for worn rocker shaft and rocker bushes.
Hydraulic tappets are tappets that contain a small hydraulic piston, pressurised by the engine's lubricating oil supply. Although the piston does not move appreciably or frequently, it acts as a hydraulic spring that automatically adjusts the tappet clearance according to the oil pressure. This makes the valve actuation self-adjusting and there is no need to adjust the rockers. Hydraulic tappets depend on a supply of clean oil at the appropriate pressure. When starting a cold engine, with low oil pressure, hydraulic tappets are often noisy for a few seconds, until they position themselves correctly.
If they are noisy (hydraulic tappets, remember?), try an oil/filter change first with a little Gunk cleaner in the crankcase before draining.
If that does not help and you seriously want to do this, do yourself a favor and get a Bently Service Manual.
The basic adjustment is "2 turns tighter (clockwise) after all lash is removed and the adjuster is just touching the valve stem." Although in practice 1.5 turns seems to work better.
GET THE MANUAL for the proper procedure including sequence as the cam must be on the base circle when you do it or the adjustment is no good.