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RogerB
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K Series Rattle

Further to the recent thread on 'K Series Let Go', which I have just read with increasing levels of anxiety, my 1.6 K series engine has developed an unusual noise from the exhaust side during the Croft Trackday. I thought I had cured this by the simple expedient of removing the heat shield which I'd wrapped round the starter motor. Flushed with success I took the car round to my pals who had also witnessed this noise at Croft. We both agreed it had gone. Sadly a couple of weeks later I started up to check her out for my last track day of the season at Knockhill to find the noise has returned. I then removed the starter motor and bump started down the drive - noise still present. I've had the cam cover off and  spark plugs out - nothing untoward there.

My best description is it sounds like marbles bouncing on a tin tray coming from the exhaust side of the cam box. I have just received a copy of Rover K Series, Maintenace, Repair and Modification by Iain Ayre and Rob Hawkins.

However it would be good to get the opinion of our K Series experts before I go any deeper.

Roger.

Sim
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Exhaust manifold touching the chassis?

Simon

revilla
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Do you get this noise at idle or under load? Can you record it, maybe upload to YouTube?

SV VVC 170 - 170.4 bhp @ 7100 rpm - 142.4 ft.lb. @ 4900 rpm

Jonathan Kay
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As above, recording please.

How about making or buying a stethoscope to help localise the source? And can you reduce the sound by holding eg a piece of wood against likely sources?

Jonathan

TomB
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A few things it could be that don't mean impending doom: water rail rattling, loose manifold, manifold touching chassis, spark plug cover, loose spark plug?  Do you have hydraulic or mechanical tappets?  

A top tip for listening is a long, wide screw driver held with the handle in your ear and the pointy end on the engine.  You'd be amazed what you can hear inside the engine, and allows problems to be quite accurately located.

 

revilla
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Also, does it do it cold, hot or both?

Any other running symptoms, or is it just the noise? Performance same as it always was?

Just a few random stabs in the dark of things to check:

  1. Exhaust headers all secure?
  2. It's definitely not coming from the alternator?
  3. If it's a distributor type engine, everything secure around / inside the distributor? Probably unlikely but an easy check.
  4. Cam belt feels reasonably tensioned (i.e. not flapping about) and is undamaged (I've seen a belt with frayed bits hanging off the edges making an almighty rattling as the flailed about). I've also seen an engine where somebody ( Whistle ) hadn't torqued up the cam belt tensioner and that made a clanking rattle that might fit your description. Easy to take the upper front cover off for a look if there's anything obvious.
  5. If it's got vernier pulleys on the cams, are they secure? Nothing to suggest the cam pulley centre bolts are coming loose?

Sometimes a stethoscope lets you pinpoint the source of a rattle more easily - I'm thinking a long screwdriver and a tin can!

SV VVC 170 - 170.4 bhp @ 7100 rpm - 142.4 ft.lb. @ 4900 rpm

revilla
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Posts crossed - a lot of common ground!

SV VVC 170 - 170.4 bhp @ 7100 rpm - 142.4 ft.lb. @ 4900 rpm

TomB
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revilla
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I'm just glad you made it clear that the point end doesn't go in your ear Smile

SV VVC 170 - 170.4 bhp @ 7100 rpm - 142.4 ft.lb. @ 4900 rpm

Jonathan Kay
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"It's coming from somewhere in the boot."

Jonathan

TomB
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Believe it or not, I did actually learn that tip from Johann the Ghost.