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Volkswagen Rabbit, Jetta, Scirocco, Convertible: 1975-1984 (A1) No notch on crankshaft pulley


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Last Post: Jun 24, 2010 12:14 PM Last Post By: FKH161
duc_rider

Posts: 11
Registered: 09/02/10
No notch on crankshaft pulley
Posted: Dec 16, 2007 11:12 PM
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Hi all...
Its been a while since I last posted, but all the good info is up there already...
However.
I am about to replace the timing belt in my 1980 Rabbit Cabriolet and I found there is no notch on the crank pulley. I figured I could use the timing mark on the flywheel but it is buried under all those hoses and whatnot... Is there any other way?
Also, my friend says you can go one tooth off in either direction in the cam timing and the car WILL start but not run, I say it WILL NOT run at all... Can you help?
Thanks a lot, best to you.
Marcial
FKH161

Posts: 6,407
Registered: 12/29/05
Re: No notch on crankshaft pulley
Posted: Dec 17, 2007 12:35 AM   in response to: duc_rider in response to: duc_rider
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See attached image...

- remove everything but the timing belt & tensioner
  • rotate the engine via crank bolt until you see the mark
on the camshaft sprocket line-up with the top of the cykinder
head (flush with valve cover gasket)
- at this point the crank sprocket should look like the attached
image
- dimple at 7 o'clock and 2 pulley bolt holes, 1 at 12'o clock
and the other at 6 o'clock
- the dimple at the intermeadiate "should" be next to the edge
of the flange as pointed out with dots

*** the dot on the intermediate shaft pulley does not "have"
to be exactly there... since the distributor can be turned
for final timing adjustments ***

The engine will run if the camshaft is off a few teeth... it
may run sluggish, but it will run.

The 2nd attached image shows an "adjustable camshaft sprocket"
with which "camshaft timing" can be adjusted without removeing
the timing belt... see how wide the "slotted sections" are?
FKH161

Posts: 6,407
Registered: 12/29/05
Re: No notch on crankshaft pulley
Posted: Dec 17, 2007 1:45 AM   in response to: FKH161 in response to: FKH161
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I guess I should point-out that the above procedure "could"
be flawed if the crankshaft sprocket "key" is worn.

The way to tell if the key (see attached image) is worn, is to
check if the TDC mark at the flywheel is at the correct position
when the crank sprocket is aligned as indicated above.

If the TDC mark is not visble when the crank sprocket is
lined-up, then ther's a good chance that the key is worn and
the sprocket has moved.
duc_rider

Posts: 11
Registered: 09/02/10
Re: No notch on crankshaft pulley
Posted: Dec 17, 2007 11:06 AM   in response to: duc_rider in response to: duc_rider
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Hey guys!!! Thanks a lot for the info and pictures... I had seen those pulleys in racers and figured they were only for high performance applications...
I will be removing the belt tonight and checking on the crank sprocket to see if it is worn...
Thank you again and Happy Holidays!!!
Schnyde

Posts: 1
Registered: 06/24/10
Re: No notch on crankshaft pulley
Posted: Jun 24, 2010 12:00 PM   in response to: duc_rider in response to: duc_rider
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Mine is an 80 also and I am performing the same maintenance. I have the A/C option which has the three piece system (described outside inward) which has a hefty, notch-free crank pulley driving the water pump and alternator, then a notch-free pulley that drives that A/C compressor that consists of two halves (sides) and shims (space between the sides where the belt is), then a hefty, notch-free cup with four studs where the first crank pulley was attached to and four M8 X 22 bolts are then attached to the crank.

I found the information in this thread helpful, however, for accuracy, would I line up the flywheel to TDC then use the other marks as described in the manual?

Thanks.
FKH161

Posts: 6,407
Registered: 12/29/05
Re: No notch on crankshaft pulley
Posted: Jun 24, 2010 12:13 PM   in response to: Schnyde in response to: Schnyde
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Not sure why I didn't mention the flywheel mark in the initial post above... the reference
to comparing it with the pulley notch in the later reply does mention it though. :-)

Personally, I always use the mark at the flywheel, due to the possible sprocket issue.

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