RS6 top end rattle on start up?
Discussion
My 2002 RS6 has developed a rattle on start up that lasts about 3 seconds, and is getting worse. It only happens when cold so I'm guessing its 1 or more tappets not getting oil straight away? (I'm also guessing that these have hydraulic tappets?)
Has anyone else had this happen and what is the most cost efficient remedy?
Try a thinner oil? Can the tappets be removed and cleaned? Or is it a case of a new set of tappets?
And if new tappets are needed any idea of price? (I dread to think!)
Any help would be much appreciated.
Has anyone else had this happen and what is the most cost efficient remedy?
Try a thinner oil? Can the tappets be removed and cleaned? Or is it a case of a new set of tappets?
And if new tappets are needed any idea of price? (I dread to think!)
Any help would be much appreciated.
Might not be the tappets but would be worth investigating. The RS6 has a history of the symptoms you described and it noramlly ends up being the timing chain (seperate to the belt) touching the inside of its cover when the pulleys get a bit worn. Normally appears only for a second or 2 and then goes away. I have an 2003 RS6 and this happened to me a while ago. If it is the case then its a fairly simple fix for a mechanic. If it is the tappets then this may be more of a specialist job and may i suggest you see / approach either MRC - 01295 277308 (Banbury) or Unit 20 - 0151 33 66 888 (Cheshire). They are the UK's RS specialists and wont rip you off like the dealers do.
Eddie
Eddie
Ah, I think you may have hit the nail on the head there, as I've noticed a faint rattle when driving the car, more noticeable when accelerating. And it sounds more like a chain rattle than a tapping noise.
But there is still a definate tapping on start up, so I'm beginning to think it may be tappets as well as chain.
Thats a big help as, like you say, I can put it in any garage and get the chain checked 1st and see if that works.
If its tappets I dont know what I'll do as I'm in cornwall all there is locally is an Audi Dealership, and I'm not sure I'd trust any old garage to start taking that engine to bits!
Many thanks for your comments.
But there is still a definate tapping on start up, so I'm beginning to think it may be tappets as well as chain.
Thats a big help as, like you say, I can put it in any garage and get the chain checked 1st and see if that works.
If its tappets I dont know what I'll do as I'm in cornwall all there is locally is an Audi Dealership, and I'm not sure I'd trust any old garage to start taking that engine to bits!
Many thanks for your comments.
The older Audi V6 and V8 do as suggest have a small chain that runs one camshaft off the other in the twin cam heads. The cam belt drives one cam only on each side.
The chain tensioners, sometime labled (due to direct germnan translation) as valve timing adjuster, are a faily common thing, normally we do them on the 1.8T but they are the same ones as on teh bigger engines so they could well be the cause of the noise.
We probably havnt seen any due to the cost of replacement at our rates, we see very few older RS6'd now as it is, there all going somewhere else I reccon.
The chain are at the back of the cylinder head, so it might pay to get your head back there while someone else starts the car and have a good listen.
The chain tensioners, sometime labled (due to direct germnan translation) as valve timing adjuster, are a faily common thing, normally we do them on the 1.8T but they are the same ones as on teh bigger engines so they could well be the cause of the noise.
We probably havnt seen any due to the cost of replacement at our rates, we see very few older RS6'd now as it is, there all going somewhere else I reccon.
The chain are at the back of the cylinder head, so it might pay to get your head back there while someone else starts the car and have a good listen.
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