Toyota 1jz engine,are they hydraulic or shim tappet,and if shim,what are the clearances?

is this in Africa TAppets ,are you sure it has this< and is HLA?
what engine is there exactly?, (step 1 to work any engine is. this.
gas/petrol of diesel? engine size. like, 3.0L? V6?
wiki
The 1400 Bakkie was assembled by Nissan in Rosslyn, South Africa (Nissan)

1.4L engine a very small pickup truck and tiny obscure engine
that wiki fails to identify.
buy the manual for NISSAN.
it is not a diesel ,and this list is all 1.4L listed by maker,1.4L and in year range.
GA14DE DOHC, 2 CAMS? AND ROCKERS? 12VVALVES
The GA14DE does not have hydraulic lifters, so special shims are used to adjust the valve clearance.

CGA3DE DOHC, 1,4K Sold as but is 1.348L
data super hard to source on the engine.
one photo shows head cams over valve stems, no tappets at all
see photo, I see bucket lifter there, so are shims.

CR14DE, with vvt

The Nissan CR14DE motor does not have hydraulic lifters, so special valve lifters are used to adjust the valve clearance.

so knowing this engine fact and the exact one makes this more easy

lacking manual or engine name, i'd look first.

CDA3DE, FOR SALE, SEE THE BUCKETS , I DO.

This will depend on whether that engine uses mechanical or hydraulic tappets. I think that model and year still used the mechanical type. Mechanical ones need a gap, hydraulic ones don't. If yours is the 2e engine, (most versions were), the clearance gap will be 5.965-5.980 mm (0.2348-0.2354 in.)

valve tappets? no shims to adjust valve lash. replace the valve tappet. it comes in differnt thickness or gind the tappet underside to correct valve clearance/s

You have asked a very big question. Adjusting the tappets is another way of saying adjusting the valve clearances.

Lots of engines these days are fitted with hydraulic tappets that are self-adjusting. Some engines are overhead camshaft types with bucket tappets and the clearances are adjusted by measuring and selecting different thickness shims. The shims are sometimes under the bucket and sometimes over. The former is a fairly big and complex job to adjust and the latter is fiddly and requires much patience.

Traditional designs using adjusting screws and locknuts exist on all manner of engine types and once the principle of which one to adjust when is learned, these are relatively straightforward.

I strongly suggest you discover first what sort of tappets you need to learn to adjust, learn something about the way the engine works and why the tappets need periodic adjustment and then pay somebody to show you how to do the job so next time you will be able to do it yourself.
Adjusting the tappets is one of the core skills of the mechanic and it is learned better by demonstration and understanding than from a book. No book can adequately describe when a feeler blade has a good or a bad "feel"...

Good luck!

Both the 2.0 liter 4-cylinder, and the 2.5 liter V6 are overhead cam engines. While all years of the V6 us hydraulic tappets, the 4-cylinder engines varied. From 1998 and earlier, they had hydraulic tappets. From 1999 on, they used shimmed mechanical tappets. Adjusting valve clearance on the later engines is a little involved, and, if you're not familiar with the procedure, it is perhaps best left to a professional mechanic who is familiar with the engine.

With such a late model car I suspect you have hydraulic tappets which means the clearance is automatically adjusted when you start

j24b engine D.O.H.C.
U.S.A?
open hood , look up. see white sticker, see clearances.?
off online F.S.M
Valve clearance specification when cold :
59 to 77deg F or 15 to 25deg C (engine temps)
Intake: 0.0063 to 0.0094 inch (0.16 to 0.24mm)
Exhaust: 0.0123to 0.0153 inch (0.31to 0.39mm)
you must remove the bucket,tappet , to change lash.
MIKE IT (that means a micrometer)
then buy shims or new buckets to fit. (generic answer)
the book says buy correct tappet after measuring, yours.
and it's out of range, and doing the math first.

that is it.

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

that is the only way you can adjust them