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It may be just that my oil needs changed...

On cold start I get the usual ‘tappety rattle’ from the top end for a couple of seconds as the fluids get back up to the top of the engine. Recently though I get a very slight ticking noise for about a minute, which then passes but on any restart (warm) that tick is there very briefly.

Is there a valve inside which should keep the oil up top, stuck open, could a failed seal someplace create this problem? I’ll change to a different weight of oil but don’t want to hide an underlying issue if there is one.

Advice appreciated.

Do you leave it a long time between using it??


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Probably a hydraulic tappet that's a bit tired. See what happens after your oil change. Presumably you're using the correct 5W40 505.01 stuff?

Jayjay101 wrote: ↑

Wed Oct 17, 2018 8:46 am

Do you leave it a long time between using it??

Mine can sound quite tappety if I've left it for a few weeks. This can last for a couple of minutes. It takes a while for the tappets to fully pressurise when they are completely drained.

Shoppinit wrote:

Jayjay101 wrote: ↑

Wed Oct 17, 2018 8:46 am

Do you leave it a long time between using it??

Mine can sound quite tappety if I've left it for a few weeks. This can last for a couple of minutes. It takes a while for the tappets to fully pressurise when they are completely drained.

Same here mate that why I asked how long he left it for-I’m thinking of wiring a switch in from fuse 29 so don’t have to pull the fuse every time I use it as I can go weeks at a time before it gets used-but me a wires don’t get on!


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That's not a bad idea. I should probably do the same.

Shoppinit wrote:That's not a bad idea. I should probably do the same.

I don’t know about you but mine rattles like f##k even if it’s left for a week! So I’ve just gotten into the habit of pulling the fuse every time I use it-I did think about a oil pressure gauge too so I could turn it over till it was up to pressure but I don’t want one on show.


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Why pull a fuse ? I'm missing something I think ?

Mark-RS wrote: ↑

Wed Oct 17, 2018 10:50 am

Why pull a fuse ? I'm missing something I think ?

Pull fuse 29 to be able to turn over the motor without it actually firing, to build oil pressure.

Ah ! Now I see ! Sure I have seen that in another thread somewhere. Thanks for clearing it up

Mark-RS wrote: ↑

Wed Oct 17, 2018 2:09 pm

Ah ! Now I see ! Sure I have seen that in another thread somewhere. Thanks for clearing it up

I think most cases of cold start rattle could be eliminated by means of the starter motor turning for a couple of seconds longer before ignition.
My car starts well within two seconds of the starter turning, hot or cold, which for a fairly large engine is too soon for the oil pressure to have built up.
Could there be a way of mapping in a longer cold start process to allow oil pressure to build up before the engine fires. This would obviously reduce engine wear.
Just my laytards thoughts.

Thinking about it ( my car is garaged for more then a year now...) how long to start after pulling fuse 29 to built up pressure ?

You can hear it when the engine becomes pressurised / lubed. Takes about 6 or 7 seconds in my case. Noise level goes down, starter turns slightly more freely. It's a subtle difference, but detectable.

What I have done in the past (albeit a 4 cylinder TDI) is do 3x 5 second cranks with a very short break between to ensure oil pressure had built - this was after many months of just sitting in the garage.

I personally wouldn't want to crank much longer than 10 seconds in a single instance to avoid overheating the starter.