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D2 - Engine Bay Everything under the bonnet

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Old 17th January 2021, 07:50 PM
Nick Jones Nick Jones is offline
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Join Date: May 2015
Location: South Somerset, UK
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Default Alternator clutch

Ever since I got it my 2.8 has sometimes made odd noises at low revs when cold with some slight sensation of it being passed back through the steering wheel. The PO thought it was the water pump, then the power steering pump. It is true the worst of the noise does seem to come from the PS pump.

Iíve been ignoring it as I was fairly sure I knew the true cause having encountered it before on my sons 1.9TDI A4.

Confirmed today that itís the over-run clutch on the alternator, which is seized. I have no idea what VAG design quirk makes these needed even on a smooth running V6 or V8..... it is certainly true that the failure produces much more violent symptoms on a diesel 4 pot.

So I need to source a new one. I already own the special tool..... hoping it can be done in situ......

Pretty sure the one on the wifeís TT is also borked. Iím ignoring that as it is even nastier to work on and the symptoms very subtle.

Nick
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Nick
Somerset, UK
1999 A8 D2 FL 2.8 2WD, Andorran red pearl 104k
1996 A6 C4 2.5 TDI Avant, Black 335k
1967 Triumph Vitesse 2L convertible, Grey
1973 Triumph GT6 Mk3, Damson
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Old 17th January 2021, 08:10 PM
MikkiJayne MikkiJayne is offline
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Location: Devon
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Default

Oddly enough, the V8 doesn't have the clutch - only the V6. Its basically the same alternator with a different rear cover so I guess its to do with harmonics that the V8 doesn't have.
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