Adjusting tappets on a rover 623 - 1997 Honda Accord

Question edited for clarity.

The cam followers have the adjustment and have to be replaced. They don't have adjustable tappets as such. Note spelling 'tappets', not 'tuppets'.

http://www.nisentra.com/camshaft_valve_clearance-411.html

https://www.google.com/search?q=Tappet+adjustment+for+1988+B12+auto+engine+Nissan+Sentra

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Here's the link and I'm sure you will get the solution of your problem
LAND ROVER FREELANDER COMPLETE WORKSHOP SERVICE MANUAL

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!

this vehicle should have hydraulic followers / lifters in which case the adjustment is done automatically and hydraulically. If you have noisy tappets it is more likely worn rocker bushes and worn rocker shaft that is causing the noise.

If you would like the manual, let me know but for now here are the measurements for the tappets:

Stem-to-guide clearance:

Inlet:

standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.03 to 0.04 mm

service limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.07 mm

Exhaust:

standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.07 to 0.08 mm
service limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.11 mm

dont know what a 51 plate is ,a 51 land rover would be manual adjusters with a B series engine which would be 12 inlet and 15 exhaust .points gap would be lucas 15th and plugs would be 25th ,didnt know they used this name freelander in 1951 ,come to think of it i didnt think they made land rovers till the middle 50s

The tappets are worn out! so they can not fill with the oil to eliminate the clearance between the tappet and the rocker arm! change them!

Hi,
The method of adjusting the tappets is the same on most engines that don't have hydraulic tappets.
The gap between rocker arm pad and the top of the valve stem is important for several reasons - to allow for expansion of the metal, to ensure that the valve is fully closed when needed, and to ensure the smooth running/timing of the engine.


The rocker cover gasket or oil filler cap leak eventually over a period of time and the top of the engine gets in a right mess, like the one shown here.
Remove the filler (series have a 7/16" bolt in the side of the cover to retain the filler)
The heater hoses are held by one of the three acorn nuts that hold the rocker cover on. Remove the center nut, and then slacken the 10mm pinch bolt enough for the pipe support to be removed.
Remove the other two acorn nuts and alloy washers, then the rocker cover will lift away.
Each tappet should have a locknut and slotted thread - you will need a 13mm ring spanner and blade screwdriver.
Starting at the front of the engine - turn the crankshaft by way of the crank bolt until No2 valve is open. The camshaft lobe for No1 is now out of the way and the tappet for it can be adjusted. Undo the locknut a couple of turns - if the threaded part turns as well, then keep it still with a screwdriver.
Insert the right thickness blade in the gap between the rocker pad and top of the valve stem and turn the tappet thread until the blade is slightly pinched. Keep the screwdriver dead still and tighten the locknut.
You may find that the tappet gap will close too much when you tighten the locknut. If that happens, then re-set the gap, allowing for this. Work through all 8-tappets, making sure that you set the correct gap for the valve - inlet or exhaust. Once done - clean around the top of the head, the gasket faces, and the rocker cover inside and out. Sticky gaskets are very handy.
Refit the cover, use new alloy washers on the three studs, and re-attach the heater hose clamp.
For pictures you can refer to: http://forums.lr4x4.com/index.php?showtopic=8023

Thank You for contacting Fixya.com

i would suggest asking your mechanic which viscosity(thickness) oil he put back in and check it against the manufacturers recommendation as if it isto thin then it will make your tappets unusally noisey if he has put in the correct oil then i would say that they were quiet because of the old gungy oil and they either need adjusting or if they are hydraulic then the lifters need replacing

there is no tappet settings, they have hydraulic lifters.
if tapping its because of lack of oil changes.
the lifters are coked up and no oil fetting in.
try engine flush and new oil with hydraulic lifter additive.
if not a set of lifters.
i have got a complete head i can knick the lifters out of for £40 and the set is yours.