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Old 12th June 2017, 07:47 PM   #1
Jim1556
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Default Think I've hurt mine...

I'm at work in Belgium, but having Sundays off, I nipped over to the Ring yesterday. It was too hot, I got sunburn and my engine is now ticking.

It's always warmed up properly before leathering commences, and has full BM service history, Insp 2 8000 miles ago.
Had a cracking day including 7 laps and a new 8.29 PB, and a cruise on the Autobahn upto 150+.

However, as I got closer to my digs in Belgium, I could hear a not quite normal noise, but put it down to paranoia and tiredness (11.30pm arrival from a 7.30am start). As I've stopped, I've let it idle for a minute and there's a distinct clicking on tickover, same this morning. The frequency increases up with revs.

I don't need the car while I'm here but will drive 300 miles home in 2 weeks.

So many horror stories on here, and it sounds top end, but not like a marble in a can type rattle.

I'm furious with myself as I filled up at Ed's with Super (95) instead of Super Plus (98) and didn't realise until I filled up prior to leaving the Ring. Maybe this was the cause (leathering it on 95)? First time I've ever put 95 RON in it!

I have tools, but limited chance to work on the car due to work (next Sunday is free, but I'd be working outside) and using a local unknown garage is a 'I'd rather not!'

Thoughts?
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Old 12th June 2017, 07:57 PM   #2
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I wouldn't risk further damage driving it 300 miles personally
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Old 12th June 2017, 08:08 PM   #3
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Check for worn cam fingers
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Old 12th June 2017, 08:17 PM   #4
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Check all the 'easy' things first, but this sounds like it has the potential to be a cracked piston
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Old 12th June 2017, 08:32 PM   #5
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Could be a cracked manifold, let it run and get an ear near the exhaust under the bonnet.
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Old 12th June 2017, 09:54 PM   #6
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Flat finger would be my guess.
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Old 12th June 2017, 10:13 PM   #7
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Quote:
Originally Posted by TomKED View Post
Check all the 'easy' things first, but this sounds like it has the potential to be a cracked piston
Eh? Never heard of an S54 cracking a piston without being forced induction?

Quote:
Originally Posted by MWagon View Post
Could be a cracked manifold, let it run and get an ear near the exhaust under the bonnet.
Don't think it's anywhere near loud enough for that, it's quite mild and sounds internal - I'll take a vid in the morning...

Quote:
Originally Posted by j3nks79 View Post
Check for worn cam fingers
Is there a DIY or just cam cover off and get busy with the feeler gauges? Everything was in spec at the Insp 2...

Quote:
Originally Posted by Steve B View Post
I wouldn't risk further damage driving it 300 miles personally
I'll try not to, worse case, I'll get it transported home. But I don't think it's that bad at the moment.

It almost sounds like my old E36 did after a leathering, ie thin oil, but it's doin it from cold...
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Old 13th June 2017, 06:46 AM   #8
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You sure its not knocking for the bottom end?

Have the rod bearings ever been changed?
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Old 13th June 2017, 07:25 AM   #9
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No, but they're the updated ones. It sounds more top end...
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Old 13th June 2017, 08:02 AM   #10
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Take the cam cover off and have a look.
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Old 13th June 2017, 08:08 AM   #11
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Is the noise still evident after giving in premium fuel?
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Old 13th June 2017, 08:21 AM   #12
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It used 3/4 of a tank of 98 on the way back here. Strangely it had almost disappeared this morning. Busy at work now in briefings all day.

Mitch, can I get away with using the old cam cover gasket for now? I'll be able to look at it Sunday, difficult to get one before then...
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Old 13th June 2017, 09:53 AM   #13
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Quote:
Originally Posted by Jim1556 View Post
It used 3/4 of a tank of 98 on the way back here. Strangely it had almost disappeared this morning. Busy at work now in briefings all day.

Mitch, can I get away with using the old cam cover gasket for now? I'll be able to look at it Sunday, difficult to get one before then...
You can "usually" get away with reusing the cam cover gasket a couple of times.
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Old 13th June 2017, 09:54 AM   #14
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Is vanos not more likely? Is it a 'vanos rattle' tick/noise?

Cam cover off to check clearances would let you see the vanos oil pump driver tabs, and also to see that the cam sprocket bolts are tight. You can see the 6 hex head bolts on each vanos hub and check them. Then look at the back of the sprockets to see the thread ends for the cam sprocket hub bolt sets (the allen head ones). These should be about flush and all the same, so a loose set would hopefully make itself obvious without the need to take the sprockets off.

I don't know if the splined shaft bearings can cause a ticking like that at idle. I'd suspect not. So the above should rule out the major potential vanos issues. Good luck! sounds like a great weekend until then...

I re used my cam cover gasket and as have others, no issue. It is a good quality rubber.

Must be ready for an oil change too at the milage and use its had.

Last edited by Rob043; 13th June 2017 at 09:56 AM. Reason: gasket.
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Old 13th June 2017, 10:11 AM   #15
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The old gasket should be fine if it had an inspection recently.

Mine had 2 cracked pistons caused by detonation due to HG failure so I hope for your sake its not that!

Let us know what you find wont you.

Olly
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Old 13th June 2017, 11:02 AM   #16
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So, during dinner time, I've taken a quick vid.
https://youtu.be/ZBz82O7Q5Zs
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Old 13th June 2017, 11:07 AM   #17
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Quote:
Originally Posted by Jim1556 View Post
So, during dinner time, I've taken a quick vid.
https://youtu.be/ZBz82O7Q5Zs
Hate to say it, but sounds like bigends to me
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Old 13th June 2017, 11:27 AM   #18
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Yeah sounds louder when just on and off the throttle? would using 95 ron put more load on the bearings due to knock?

I'm noexpert but hoping it's not the bearings for you, doesn't the vanos grumble like that?
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Old 13th June 2017, 11:27 AM   #19
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Quote:
Originally Posted by cossie1 View Post
Hate to say it, but sounds like bigends to me
+1,

I wouldn't be driving that until its been looked at!
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Old 13th June 2017, 11:33 AM   #20
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I would personally say it was top end - flat finger as mentioned, but really hard to tell from a vid. Mine has been making that noise for a while now and I've been ignoring it like a melon until I do a valve clearance check as I believe when the finger wears the cam lobe is likely shot as well. Rocker cover off and have a look?

Hopefully it isn't big ends - I have not heard big end failure on an S54 but on other engines I've had its more of a pronounced tock kind of noise. You could try timing it, the frequency of ticks will give you a good idea of whether its top end or bottom end.

*Edit - I listened to it again and it does sound disturbingly like big ends from certain mic orientations

Last edited by TouringRob; 13th June 2017 at 11:50 AM.
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