|Tappets need shims
Question : DO the tappets on a 1998 Toyota Harrier
2.21 require regular adjustment? The engine
on my vehicle rattles noisily but my
mechanic tells me that there is nothing that
can be done to silence the engine, save a
THE tappets on a Toyota Harrier 2.21 can be
adjusted to quieten the engine if, indeed, the
tappets were making the noise in the first
However, unlike conventional tappets,
adjustment is done by replacing shims, and
not by a "nut and screw" adjustment.
Your mechanic would first have to measure
the valve clearance, then remove and measure
the thickness of the shims on each respective
valve. The thickness of the replacement shim is
then calculated in order to bring the tappet
clearances to specification.
All this work has to be carried out on a cold
engine so this may mean that your vehicle will
be have to be off the road for at least 24 hours.