AAZ timing belt replacement & crank pulley wobble |
Post Reply |
Author | |
thephatmaster
Newbie Joined: 23 Feb 13 Location: UK Status: Offline Points: 6 |
Post Options
Thanks(0)
Posted: 24 Feb 13 at 22:40 |
Hi there,
I am about to do my AAZ's timing belt and have researched the procedure in my tech manual (Hayes) and on this forum. I am confident about the job, and have fabricated the camshaft locking and bracing tools. I'll also be fitting a clutched alternator pulley as a preventative measure to preserve my middle-aged (130k miles - 1996) engine's longevity. I note from this and other forums that the crankshaft keyway on some AAz engines becomes worn causing pulley wobble, which can be fixed by fitting a dowel, or machining the crank nose. There are two things which confuse me though: Firstly I don't get how to test for wobble during my timing belt replacement, nor how much wobble is "acceptable". Should I: - Remove the crank pulley and inspect the keyway visually for damage (before refitting it, using a new bolt); or - Not remove it, and attempt to wobble it by hand, or with a tool to check for play? Secondly: - There is a lot of talk of "harmonic balancers" and how they get worn (causing pulley wobble), the pictures I see in my manual show the crank pulley as a small toothed pulley with no additional parts, should I be checking something else? The reason I worry about pulley wobble is that I recently replaced my power steering belt and observed that the PS belt pulley on the crankshaft wobbled by approx 5mm while running. Fitting a new belt (tensioned correctly) seems to have cured this, and it now runs with no wobble. I'd be grateful for any assistance on these points. Steve |
|
light
Vanorak Joined: 25 May 10 Status: Offline Points: 1146 |
Post Options
Thanks(0)
|
The bit that would wobble is the toothed pulley on the crank you should not undo the 19 mm bolt unless you find you have play in the pulley and there should be no play what so ever
You can sometimes get a wobble in the auxiliary belt pulley ( the one bolted on to the toothed pulley with 4 cap head bolts) as they have a rubber damper in them that can deteriorate over time
|
|
max and caddy
Vanorak Joined: 12 Dec 09 Location: Lancaster..uk Status: Offline Points: 4866 |
Post Options
Thanks(0)
|
I would just whip that 19 bolt out and have a look myself...New bolt and back on if its ok...repair with a "d" pulley if not....forget the dowel method, it's a bodge...best to use the later pulley and mod the crank to suit...I,also fit the pulley with bearing retaining fluid on the crank nose.
Only problem with taking the pulley off is holding the engine still when re fitting the bolt...but a tool can be made fairly quickly. |
|
thephatmaster
Newbie Joined: 23 Feb 13 Location: UK Status: Offline Points: 6 |
Post Options
Thanks(0)
|
Thanks guys,
I must say I prefer the "not touching it" approach... I've learned that the less I disturb engine parts the less goes wrong. So is this rubber bit the harmonic balancer everyone is taling about? Guess that I can just get a new rubber bit / aux belt pulley if it's shot? |
|
thephatmaster
Newbie Joined: 23 Feb 13 Location: UK Status: Offline Points: 6 |
Post Options
Thanks(0)
|
Also, on the replacement with a "D" pulley... rather than getting the crank machined (and therefore having to remove it) - can it just be filed carefully by hand?
|
|
light
Vanorak Joined: 25 May 10 Status: Offline Points: 1146 |
Post Options
Thanks(0)
|
No to this one
|
|
light
Vanorak Joined: 25 May 10 Status: Offline Points: 1146 |
Post Options
Thanks(0)
|
|
|
thephatmaster
Newbie Joined: 23 Feb 13 Location: UK Status: Offline Points: 6 |
Post Options
Thanks(0)
|
Sweet, will call my VW Stealer & email Brickwerks and see if they have the rubber... One last question, which dial gauge adaptor do i need for the AAZ - one of these?
http://www.dieselkontor.de/product_info.php?products_id=1030 |
|
max and caddy
Vanorak Joined: 12 Dec 09 Location: Lancaster..uk Status: Offline Points: 4866 |
Post Options
Thanks(0)
|
The rubber part is not replaceable, and the pulley alone has been replaced by a kit including a freewheel pulley from vw.
Edited by max and caddy - 10 Mar 13 at 09:53 |
|
thephatmaster
Newbie Joined: 23 Feb 13 Location: UK Status: Offline Points: 6 |
Post Options
Thanks(0)
|
Nice, do you know the pulley kit part number?
|
|
Italjohn
Not Quite Newbie Joined: 29 Aug 18 Location: Norway Status: Offline Points: 15 |
Post Options
Thanks(1)
|
My solution to the wobbley pulley.
|
|
Post Reply | |
Tweet |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |