| [ Total Views: 467 | Total Replies: 6 | Thread Id: 20198 ] |
|
|
 4 of 50
Commited Dubber
Posts: 71
Threads: 21
Registered: September 12th, 2003
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
Mood: BBrrrrrrr!
|
| posted on March 11th, 2004 at 11:13 AM |
|
|
Static timing with simple tools
How do I find TDC on a 77 bus standard engine?
I lost the end of a pen in my last attempt to find TDC and this was because the spark plug enters the cylinder at a perpendicular angle. Hence putting
a pen in the cylinder results in it becoming trapped (and broken ).
My last bus, '71, you could put a pencil in the plug hole and the advancing cylinder would push the pencil out and when it reached TDC the pencil
would stop etc etc.
My next task is to find my timing mark measured from TDC (there is no timing mark on the case)
|
|
|
1303Steve
A.k.a.: Steve Carter
Scirocco Rare
Posts: 8650
Threads: 564
Registered: August 27th, 2002
Member Is Offline
Location: Sydney, NSW
Theme: UltimaBB Pro Blue ( Default )
Mood: Parrot Heading
|
| posted on March 11th, 2004 at 12:36 PM |
|
|
Hi
Do have a 2 litre? Well supposing you, the timming scale has TDC on it, line up your timming mark to the 0 marking and then check where your rotor is
pointing, that will be TDC on the cylinder.
The reason you broke your pen is because the plugs go in at a very shallow angle to the piston on the Type 4 motor, unlike the Type 1 engine.
1302Steve
|
|
|
4 of 50
Commited Dubber
Posts: 71
Threads: 21
Registered: September 12th, 2003
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
Mood: BBrrrrrrr!
|
| posted on March 12th, 2004 at 11:31 AM |
|
|
Cheers mate, yes its a 2 litre
My problem is that I dont have a timing scale on the case or attached to the case. I only have a mark on the front side of the pulley.
How did anyone time the bus previously? I have no idea, can this be done with a timing stobe light?
[Edited on 12-3-2004 by 4 of 50]
|
|
|
KruizinKombi
A.k.a.: Col
Bishop of Volkswagenism
Seriously Obsessed Cyber Dubber
Posts: 3493
Threads: 104
Registered: August 25th, 2002
Member Is Offline
Location: Gippsland, Victoria
Theme: UltimaBB Pro Blue ( Default )
Mood: Indifferent
|
| posted on March 12th, 2004 at 11:43 AM |
|
|
I have the same problem on my bus (no timing mark) which I work around by having a mark on the pulley which lines up with the join between the case
halves when the timing is correct. :thumb
Use the pen trick again, but as you turn the crank, use the pen to feel where the piston is. Don't just let it sit there and hope the piston will
push it out. 
Kruizin Kol
|
|
|
1303Steve
A.k.a.: Steve Carter
Scirocco Rare
Posts: 8650
Threads: 564
Registered: August 27th, 2002
Member Is Offline
Location: Sydney, NSW
Theme: UltimaBB Pro Blue ( Default )
Mood: Parrot Heading
|
| posted on March 12th, 2004 at 11:43 AM |
|
|
Hi
I think you need to buy a timing scale, the last one probably got wiped out by a fan belt breaking I guess. When I worked in a VW shop, I often found
that when tuning regular customers cars that after changing and setting the points the timing did not need to be adjusted. You will also need to find
out where your timing is supposed to be set, from memory 7.5 BTDC on a single vac dizzy or 5 ATDC for a twin can, maximum measured on the timing scale
with vac lines disconnected should be 32 degs total when you rev it up to about 2-3000 rpm.
Another thing I always found was that after changing the points and running the car for about 15 minutes the timing would retard about 5 degrees, this
was caused by the rubbing block on the points scrubbing in, after this initial retard the timing on retarded itself a tiny amount as the rubbing block
wore.
1302Steve
|
|
|
4 of 50
Commited Dubber
Posts: 71
Threads: 21
Registered: September 12th, 2003
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
Mood: BBrrrrrrr!
|
| posted on March 14th, 2004 at 08:24 AM |
|
|
Cheers fellas
Is it possible to time by ear if you know roughly where the timing mark is to begin with?
I have the mark on the case I have made by using a static light when the no.1 cylynder is @TDC (plastic in the hole mark)
I will look into getting a new scale, thanks
[Edited on 13-3-2004 by 4 of 50]
|
|
|
koolkarmakombi
Veteran Volks Folk
enkarmarising
Posts: 2078
Threads: 158
Registered: June 16th, 2003
Member Is Offline
Location: viva brisvegas
Theme: UltimaBB Pro Blue ( Default )
Mood: do you see the bats?
|
| posted on March 14th, 2004 at 03:34 PM |
|
|
DO NOT DO IT BY EAR!!!!!
It will end up too far advanced.
Find TDC then mark the pulley.
Find out the timing spec for your engine/dizzy combo.
Draw that angle on a piece of paper (ie 7.5 degrees) and measure the distance between 0deg and your timing spec at the same distance out as the radius
of your crank pulley. Mark this on the crank pulley and time to that mark if you use static timing method. Ideally draw 32deg and mark that too so
you can check full advance with a timing light. Nail polish is good to use to do the marks. Draw a diagram of the pulley with the dots labelled and
stick it under the engine hatch so you dont forget what dot was what.
kkk |
|
|
4 of 50
Commited Dubber
Posts: 71
Threads: 21
Registered: September 12th, 2003
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
Mood: BBrrrrrrr!
|
| posted on March 16th, 2004 at 06:21 PM |
|
|
That is all sensible stuff thanks.
I will try to find TDC with a peice of wire and go from there.
|
|
|
4 of 50
Commited Dubber
Posts: 71
Threads: 21
Registered: September 12th, 2003
Member Is Offline
Theme: UltimaBB Pro Blue ( Default )
Mood: BBrrrrrrr!
|
| posted on March 16th, 2004 at 06:32 PM |
|
|
here is the thread of my first round of timing mark questions for anyone who is in the same boat
Import Advantage, Brisbane 07 33576966
...you may be able to get the plastic bolt on timing mark from these guys.
|
|
|
