An intermitant noisy tappet ????????????? Tappets seem unadjustable.

Noisy lifters (tappets) are caused by wear in the valve train, this is a fact of life for engines and normal. Two choices, go to the next higher viscosity oil(which will only quiet it a little), or have the valve train rebuilt. I personally have seen noisy engines run 10-15 years with no major failures!

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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.

they adjust on this model

I DON'T KNOW HOW MANY MILES ARE ON THE ENGINE. Found no bulletins for noise concern
Intake tappet clearance should be .006"-.010" and
Exhaust clearance should be .010"-.014"

tappets cannot be tight and noisy at the same time . Check the rocker and rocker shaft for wear in the shaft and rocker bushes.

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..

one or both of two things can cause this

low oil pressure to lifters
or there clearance is not adjusted correctly

clearance should be adjusted with engine hot and idle'ing using a go /no go shim of proper thickness

Hydraulic tappets are tappets that contain a small hydraulic piston, pressurised by the engine's lubricating oil supply.[5] 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.


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Don't bother. They are hydraulic and rely on oil pressure to obtain a zero clearance when everything is OK. Your oil system may be sludgy or you may be using the incorrect viscosity oil.

Did you check the pressure first? Noisy tappets don't necessarily mean low pressure, sometimes they simply wear out.
Otherwise, either your oil pump is bad, or the oil pickup screen located inside the oil pan area is clogged up. Clean the screen first and then check the pressure...