timing

hi everyone!
on a 71 beetle, i know the timing is supposed to be at 5 degrees atdc, but
i dont know what mark on my pulley is 5 degrees atdc
my pulley has 2 marks on it, 1 at the inside(case side) and one at the
outside(facing rear of car)that is about half an inch to the right of the
inside.
thanks for the help in advance
matt

187 wrote:
> hi everyone!
> on a 71 beetle, i know the timing is supposed to be at 5 degrees atdc, but
> i dont know what mark on my pulley is 5 degrees atdc
> my pulley has 2 marks on it, 1 at the inside(case side) and one at the
> outside(facing rear of car)that is about half an inch to the right of the
> inside.
> thanks for the help in advance
> matt
>

The outside (facing you) should look like a "dimple".
That is TDC.

The "notch" on the far side is 5 deg ATDC.

So, as the crank turns, TDC occurs first,
followed 5 degrees later by the timing mark.

Speedy Jim
http://www.nls.net/mp/volks/

Speedy Jim wrote:
> 187 wrote:
>
>> hi everyone!
>> on a 71 beetle, i know the timing is supposed to be at 5 degrees atdc,
>> but
>> i dont know what mark on my pulley is 5 degrees atdc
>> my pulley has 2 marks on it, 1 at the inside(case side) and one at the
>> outside(facing rear of car)that is about half an inch to the right of the
>> inside.
>> thanks for the help in advance
>> matt
>>
>
> The outside (facing you) should look like a "dimple".
> That is TDC.
>
> The "notch" on the far side is 5 deg ATDC.
>
> So, as the crank turns, TDC occurs first,
> followed 5 degrees later by the timing mark.
>
> Speedy Jim
> http://www.nls.net/mp/volks/


The timing setting can no longer be determined by the year of the car.
By now, most beetles are on their 2, 3rd or more engines, and since you
can mate just about any year engine with just about any year car or
transmission, you can't really trust that the engine in your car is the
original, unless you manage to check the numbers and they match. Even
then, you can't tell if the distributor or carburation are exactly right.


Therefore, you should determine proper ignition timing by the actual
engine components you HAVE in place, that together dictate the timing.

5ATDC is for engines that have a dual vacuum advance distributor, i.e.
the distributos vacuum canister has two hoses going to it, instead of
one. To be able to use this type of distributor, the CARBURATOS must
have two vacuum signal ports. One on the left side of the carb, (vacuum
advance) and one on the vehicle rear facing side of the carb (vacuum
retard).

If you do not have these two vacuum signals available, you cannot use
5ATDC, and you should therefore use the single-vacuum setting of 7BTDC
in MOST cases.

Jan




--
--------------------------------
Beer is made by fermentation caused by bacteria feeding on yeast cells
and then defecating.
In other words, it's a nice tall glass of bacteria doo-doo.

Jan wrote:

> The timing setting can no longer be determined by the year of the car.
> By now, most beetles are on their 2, 3rd or more engines, and since you
> can mate just about any year engine with just about any year car or
> transmission, you can't really trust that the engine in your car is the
> original, unless you manage to check the numbers and they match. Even
> then, you can't tell if the distributor or carburation are exactly right.

Agreed. Just like on an old motorcycle, remove all the spark plugs and
stick your finger down the #1 spark plug hole (on a cold engine.) Turn
the engine in the direction of normal rotation and when you feel
comression, stick a clean plastic soda straw down the spark plug hole
and turn until you feel TDC. Scratch in a new TDC mark and go from there.

Tony

thanks everyone for your replies.
the mark that jim said was 5 degrees ATDC was what i had timed it up by, i
was told by someone that i had the wrong pulley on it, and the marks were 7
and 10 degrees before top dead center.
so i timed it up with what ran best, which was the correct mark, just
didnt know it then.
i did know to leave both vaccum hoses connected when setting timing.
i'm still having the heating problem, and was hoping timing was the
culprit, but i ain't that lucky!

thanks again

matt

my favourite pasttime reading

http://www.vw-resource.com/vw-resour.../find_tdc.html

Crankshaft Pulley


Wisdom of Rob Boardman

There are at least six different VW pulleys, four of which are in
common use. They all fit on every crankshaft, so it's important to know
what you've got!

Following are the four types of pulleys in common use on aircooled
Volkswagens -


The one-notch pulley is 5-degrees ADTC (that's AFTER) and is used with
the double vacuum distributors, 1971-1973.


The dimple and notch pulley has a small dimple on the rearmost (rear of
car) rim which is TDC and a notch on the front (front of car) rim which
is 7.5 degrees BTDC.


The two-notch pulley (only about 3mm apart) has no TDC mark; the two
notches are 7.5 degrees and 10 degrees BTDC.


The 3-notch pulley has a notch at TDC, then one at 7.5 degrees BTDC and
another at 10 degrees BTDC. These are close together and to the right
of TDC.

You have to find TDC for #1 cylinder (see our Tune-Up Procedure (Step
#6), then look at the notches to confirm what you have.

To summarize: Turn the pulley so the notches/dimple/whatever is roughly
at the top. Remove the #1 plug (right front cylinder) and place a long
pencil in the hole (nothing metal please - the plug threads could get
damaged) and feel for the top of the piston. Rock the engine back and
forward until you find the highest point, and this will be over several
degrees, so you want the "null" point in the middle.

Now look at the pulley. Is there a dimple near the split in the
crankcase? If so you have a dimple TDC and you will have a notch to the
right which is 7.5 degrees BTDC.

Do you have one notch to the left? If so, you have a 5-degree ATDC
notch and you need to make a mark 11mm to the right for TDC or 18mm to
the right for 7.5 degrees BTDC.

Both notches to the right? Then it's a 7.5-degree and 10-degree BTDC
pulley.

One notch about on the split and two to the right - then it's a TDC,
7.5-degree and 10-degree BTDC pulley.

Now you know what you've got, you can time it according to the
distributor you have (009, single vacuum, double vacuum or SVDA) - see
the our Tune-up Procedures -- all distributor types are covered.

Incidentally, if you have a 009 distributor, it must be set at 28-32
degrees at 3000 rpm. You can't accurately set the 009 distributor to an
idle setting -- they vary too much (cheap build). 30 degrees is 46.5mm
to the right of TDC around the rim of the pulley -- make a mark that
you will be able to see with your timing light.




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