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Permanent grating noise from running engine

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Dez View Drop Down
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    Posted: 03 Mar 2018 at 11:15am
I run a 1.5 diesel note. There is a constant throbbing. Grating noise when engine running. As if a hydraulic pump is constantly at work. Any suggestions most welcome . before there is a loud bang which I'm expecting anytime
Thank you Dez
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mnl View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mnl Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar 2018 at 8:39pm
Most likely a bearing- alternator, idler pulley, air con pump, water pump etc.
Could be the brake booster pump, could even be turbo.

Get a garage to look at it before you get stranded somewhere
I want to go back to The Olden Days, when every single thing that I can think of was better!
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Dez View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dez Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar 2018 at 8:55pm
Thanks for your reply, I’ve had Nissan dealer and one reliable independent garage listen to this noise on tickover. Nissan deny completely any noise issue and rule out any standard component failure.
The independent agrees there is a noise but cannot fault find it.
I’d really like to clear this one up. Again many thanks for your recommendations..Dez
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crunchie View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote crunchie Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2018 at 1:03pm
Possibly an easy diagnosis.....or possibly a time consuming one.......

Firstly, stay well clear of the dealer. They are more often than not poor at diagnosing problems as they are not mechanics. Instead they like to throw parts at it (at your expense) until they stumble upon and replace the faulty component. (I once got dealer stung for over £600 of ignition parts and key coding for what turned out to be a faulty Lambda sensor that cost me £10 form an indy. I never use dealers for servicing and repairs anymore).

Did either the dealer or garage use a mechanics stethoscope to sound out the external engine and aux components? This should at least give an indication as to roughly where the noise is coming from, if not pointing it out exactly. You could try something similar by using a long screwdriver by pressing the handle to your ear then touching the blade to various parts of the engine, you should be able to hear the noise this way. *Take care the blade doesn't slip towards moving components*

Unfortunately if this doesn't work then it will be a case of going through each component one by one to find out the culprit. It is easy enough to disconnect and check the more likely culprits, the alternator and water pump, including tensioner pulley. Also check that nothing has become dislodged and is rubbing against the belt or pulley. As mnl said above, the turbo and brake booster pump are also the more likely culprits. If it's not any of them, then it's possible it will be an engine internal issue.....timing belt/chain could be checked. Anything else would be an engine stripdown from top to bottom.

Mind you, if your initial "sounder" test indicated the noise coming from the gearbox area, The clutch is the only thing you can test....does the noise go away when you depress the pedal? Anything else in the gearbox I would leave to a specialist to sort out.


2008 Nissan Note 1.4 Visia & 2013 Toyota Yaris
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Dez View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dez Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2018 at 10:10am
Thanks for your positive suggestions. Especially of the dealer fitters ill pist here when I get the answer I just find it odd that no one else has experience of this strange noise.
And its NOT a wind up
Thanks again . Dez
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Post Options Post Options   Thanks (0) Thanks(0)   Quote crunchie Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2018 at 11:01am
Likely most of us have experienced the same noise at one time or other. Trouble is, we can't hear the noise on the forum to give you a better steer on the problem. Might be an idea to try and get a video of the engine running and post it to You Tube. That way we can hear the sound, which is most likely distinctive enough to indicate the problem. It would also give us a good idea where the sound is coming from. All the likely issues mentioned before have a specific type of sound no matter which car or engine it is from. Smile
2008 Nissan Note 1.4 Visia & 2013 Toyota Yaris
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Dez View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dez Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2018 at 8:00pm
Thanks I’ll try and make a vid with sound. Ta
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Post Options Post Options   Thanks (0) Thanks(0)   Quote silverhairs Quote  Post ReplyReply Direct Link To This Post Posted: 14 Mar 2018 at 4:45pm
You say it's a grating sound, I've just glanced through the posts, does it only happen when your on tick over?  I ask this as when the rev's drop off, the air con clutch keeps going in and out and makes a terrible sound, but is OK once you get to about 1500RPM  Turn off your air con unit, could be the sound your hearing? 
If a jobs worth doing, it's worth doing well
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dez Quote  Post ReplyReply Direct Link To This Post Posted: 17 Mar 2018 at 8:21pm
Yea ta the a.c clutch is very noisy, but yes this noise is only on tickover, eg few revsthen gone.
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mnl View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mnl Quote  Post ReplyReply Direct Link To This Post Posted: 18 Mar 2018 at 9:29am
The diesel is a wholly Renault engine.
Renault are famous for problems with noisy dephaser pulleys, does the 1.5 have one? try googling 1.5 dci k9k dephaser pulley.
I want to go back to The Olden Days, when every single thing that I can think of was better!
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