TAPPET ADJUSTMENT

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TAPPET ADJUSTMENT
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TAPPET GAP ;

Set with the engine COLD ;

Inlet ; 6 Thou { 0.1524 mm } ; Exhaust ; 6 thou { 0.1524 mm }

Set with the engine HOT ;

Inlet ; 10 Thou { 0.2540 mm } ; Exhaust ; 10 thou { 0.2540 mm }

{ If you can set the tappets with the engine HOT you must have asbestos hands ! }

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There are a couple of METHODS you can use to check your tappets .

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METHOD 1 ;

Check / Set tappets on one cylinder at a time .

With the engine at Top Dead Centre on the Compression stroke and both valves closed ,

Set both inlet and exhaust on the same cylinder .

METHOD 2 ;

Use the rule of 9 .

With number 1 valve fully open set tappet number 8  

With number 2 valve fully open set tappet number 7

With number 3 valve fully open set tappet number 6

With number 4 valve fully open set tappet number 5

With number 5 valve fully open set tappet number 4

With number 6 valve fully open set tappet number 3

With number 7 valve fully open set tappet number 2

With number 8 valve fully open set tappet number 1

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PREPARATION ;

Remove the Drivers side engine access panel

Remove the hose from the rocker cover breather

Remove the air filter assembly

Remove the petrol hose from the carb

Remove the overflow hose from the carb { If fitted }

Remove the 2 nuts /washers { and brackets if fitted  } holding the rocker cover on

Remove the rocker cover

{ You might have to give it a gentle tap on the side with a rubber mallet or a block of wood }

Remove the Distributor cap and HT leads

Remove the spark plugs

{ You do not have to remove them but it makes it a little easier to turn the engine with the spanner }

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Using METHOD 1 above;

Using  a 9 / 16 AF spanner on the bolt in the middle of the engine fanbelt pulley

turn the engine in a clockwise direction

{ With the spanner in from the drivers side of the car pull the spanner UP towards you }

Turn the engine round till the rotor arm tip is pointing towards Number 1 cylinder

{ the one nearest the fan } and line up the Top Dead Centre Marks on the fanbelt pulley

and the timing cover { see diagram }

http://picasaweb.google.com/lh/photo/M83VnzZeali1f_VCZ3NBU0xp2BjIok7dhNG9om_g66Y?feat=directlink 



Number 1 cylinder should now be on the compression stroke with both inlet and exhaust valves closed .

You should be able to easily move the rockers sideways against the springs on the shaft  .

Check each gap by first inserting a 4 thou gauge then a six thou then try an eight thou one.

The FOUR thou should slide in easily ,

the SIX thou should be a grippy sliding fit

and the EIGHT thou should not fit .

To check the other cylinders just turn the engine round to the next cylinder

and check both valves are fully closed .

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If Adjustment is required then do as per following ;

ADJUSTING TAPPETS

Using a 7/16 AF or an 11mm ring spanner and a good fitting screwdriver slacken the locknut .

Both the following pics were hand modelled by my lovely assistant ; My Wife .

http://picasaweb.google.com/lh/photo/JGRryowYAo9Oi9U8YBDHGQ?feat=directlink

Grind a screwdriver so that the tip is parallel instead of tapered .

This is to enable the screwdriver to fit SIDEWAYS into the slot on the adjuster or use a short “ T “ bar screwdriver .

http://picasaweb.google.com/lh/photo/bTyCm6FakG7-IhZFTsUwDQ?feat=directlink

With the engine at Top Dead Centre on the Compression stroke and both valves closed ,

Set both inlet and exhaust tappets on the same cylinder .

Adjust the gap using the slotted adjuster .

When you have the gap correctly set just tighten up the locknut .

Keep the screwdriver in the slot and hold it in that position because when you tighten

the locknut you will turn the screw .

Check the gap after you have nipped the lock nut up .

It will have no doubt tightened and the gap will be TOO tight .


You will have to redo them again but this time lets try and be smart to try and fool the lock nut .

Set the gap to 8 thou instead of six and hopefully when you retighten

the gap will be 6 thou when you check it .

Unfortunately you might have to do this sequence a few times before

you get the gap correct .

Remember it is best to have the gap set correctly

but if you cannot get it exact then it is better to have a slightly slack tappet than a tight one .

NOTE ;

SOMETIMES THE LOCK NUTS EDGES ROUND OFF ,

SO BEWARE SKINT KNUCKLES !

SOMETIMES { VERY , VERY RARELY } ONE OF THE EDGES ON THE

SCREWDRIVER SLOT SNAPS OFF !

THIS WOULD MEAN THAT YOU WOULD HAVE

TO REPLACE THAT TAPPET ADJUSTER BY

REMOVING THE COMPLETE ROCKER SHAFT ASSEMBLY .

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Using METHOD 2 above ;

To check when each valve is fully open put your fingertip on top of the adjuster of the valve

which is GOING DOWN .

Using  a 9 / 16 AF spanner turn the bolt in the middle of the engine fanbelt pulley turn the engine

in a clockwise direction

{ With the spanner in from the drivers side of the car pull the spanner UP towards you }.

As you continue to turn the engine SLOWLY

YOU WILL COME TO A POINT WHERE THERE WILL BE NO MOVEMENT DOWNWARDS and

IF YOU CONTINUE TURNING THE ENGINE YOU WILL FEEL THE VALVE STARTING TO GO upwards .

Stop turning the engine forwards and turn it back till you feel the valve just going UP again .

Now once again start turning the motor SLOWLY in a clockwise direction till you

COME TO A POINT WHERE THERE WILL BE NO MOVEMENT DOWNWARDS .

We will for the sake of easiness assume that the valve which is fully down { OPEN } 

is number 8 { the one at the rear of the engine }

This means that you check the gap on number 1 tappet .

You should be able to move the rocker sideways easily .

Check each gap by first inserting a 4 thou gauge then a six thou then try an eight thou one

The FOUR thou should slide in easily ,

the SIX thou should be a grippy sliding fit

and the EIGHT thou should not fit .

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

If Adjustment is required then do as per following ;

ADJUSTING TAPPETS

Using a 7/16 AF or an 11mm ring spanner and a good fitting screwdriver slacken the locknut .

Both the following pics were hand modelled by my lovely assistant ; My Wife .

http://picasaweb.google.com/lh/photo/JGRryowYAo9Oi9U8YBDHGQ?feat=directlink

Grind a screwdriver so that the tip is parallel instead of tapered .

This is to enable the screwdriver to fit SIDEWAYS into the slot on the adjuster or use a short “ T “ bar screwdriver .

http://picasaweb.google.com/lh/photo/bTyCm6FakG7-IhZFTsUwDQ?feat=directlink

Adjust the gap using the slotted adjuster .

When you have the gap correctly set just tighten up the locknut .

Keep the screwdriver in the slot and hold it in that position because when you tighten

the locknut you will turn the screw .

Check the gap after you have nipped the lock nut up .

It will have no doubt tightened and the gap will be TOO tight .

You will have to redo them again but this time lets try and be smart to try and fool the lock nut .

Set the gap to 8 thou instead of six and hopefully when you retighten

the gap will be 6 thou when you check it .

Unfortunately you might have to do this sequence a few times before

you get the gap correct .

Remember it is best to have the gap set correctly

but if you cannot get it exact then it is better to have a slightly slack tappet than a tight one .

To adjust all the others just notice which valve is going down and set the relevant other numbered tappet .

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Reliant World forum member  " cloudbase " reminded me that I had forgotten to add the following info ;

................................................

After adjustment , using  a 9 / 16 AF spanner on the bolt in the middle of the engine fanbelt pulley ,

turn the engine in a clockwise direction a couple of full revolutions .
Now recheck the gaps and adjust if required

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This page is hopefully going to be updated when I get more info ,
which hopefully you can inform me of at my e-mail address at

fifer3w@hotmail.co.uk

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Disclaimer:/ SMALL PRINT !!!!!
I take no responsibility for loss , damage or injury of any kind caused by use of tips or advice from
this web site or any other
sites from the links I have given !!!
Such details and links are put there to provide a possible guide or solution to a problem but it is
the responsibility of
the user to ensure that any details and links given are safe and practical .
Do not try and copy anything you see on the links if you do not feel competent enough to decide
if the advice
given is good , bad or otherwise then please seek expert opinion.
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