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Author Topic: Burnt out Rota Arm  (Read 1795 times)

Offline jackdaw

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Burnt out Rota Arm
« on: 19 July 2010, 09:10 »
 My MK3 8valve has been pinking since I got it a month or so ago, I eventually got round to checking the Dizzy timing yesterday.  :shocked: :shocked: Dizzy timing is spot on but the rota arm aint about 10mm off the end is burnt off. Guess its time for a new dizzy cap and rota arm :grin:
Just wanted to check that this dosent point to something else being at fault and causing the rota arm to burn out 
« Last Edit: 20 July 2010, 17:17 by jackdaw »
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Offline jackdaw

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Re: Burnt out Rota Arm
« Reply #1 on: 19 July 2010, 16:09 »
Thats odd changed rota arm, dizzy cap and leads (allready changed plugs and air mass sensor). left the battery disconected for a couple of hours (to clear the fault codes) reconected it back up left it 40min then went for a spin still running the same  :cry: scanded it with vag.com hall sensor fault...
Cleared that but havent had chance to go back out in it as I got to get ready for work  :embarassed:


Will know if its fixed on the way to work, will let you know... Fingers crossed

Grrr still pinking and 5k rev limit gonna check that timing again
« Last Edit: 20 July 2010, 08:09 by jackdaw »
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Offline danny_p

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Re: Burnt out Rota Arm
« Reply #2 on: 19 July 2010, 17:34 »
might need new knock sensors
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all the VW's have gone bar 1.

Offline jackdaw

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Re: Burnt out Rota Arm
« Reply #3 on: 20 July 2010, 17:20 »
not 100% certain about these timing marks


Which one or is it inbetween help  :cry:
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Offline rubjonny

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Re: Burnt out Rota Arm
« Reply #4 on: 21 July 2010, 09:40 »
its the notch between the teeth usually, but it doesnt look like the OT mark you would normally see? check the inside of the cam sprocket, sometimes there is a punch mark that lines up with the top edge of the cylinder head. if under that tipex is a 'T' then yeah thats probably the OT mark. could whip rocker cover off and check the cam lobes on #1, should be pointing up and away from each other at TDC like this-> |\  /|
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Hello my name is John and I'm a dub addict.

Offline jackdaw

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Re: Burnt out Rota Arm
« Reply #5 on: 24 July 2010, 15:09 »
yes that mark does have a T underneath, today i checked the engine timing marks and dizzy timing marks all line up... they do give or take a couple of mill.
I also noticed that when the meatal bit on the end of the rota arm came off it shaved loads off the inside of the dizzy cap so i spent about 20 min removing all the shavings and the metal rota arm end from underneath the black plastic proctection cover. how so much crap got under there I dont know (there was loads).

It seems to idle much better now, gonna check the codes in a mo and clear any there are and go for a blast. hopefuly fingers crossed  :cool:
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Offline jackdaw

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Re: Burnt out Rota Arm
« Reply #6 on: 24 July 2010, 17:55 »
Cleared hall sensor fault with VAG..
no other faults
Went for a blast  :smiley: car revs as it should, still a little lumpy but ok for now.
Come back restart car go for a drive 5k limit back. :cry:
So guys whats my next plan of action??
Knock sensor or new Dizzy or is there something else
I have allready given it 10k boost and copious amounts of redex but am running out of ideas and only really know what I've read off the forum
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