Strange underbonnet noise?
Discussion
Hi folks,
I've had the car back a few weeks now, still totally love it
I have started to notice a strange noise from under the bonnet and annoyingly it is intermitent
As ever it will not do it on demand and I have only managed to catch it twice.
I will do my best to describe it. I have only ever noticed it when the car is hot and I have come to a stop. I do not know if it does it when I'm on the move. It is coming from the engine bay, I think. It is almost like an adjustment noise, if that makes sense. Like something under there is adjusting itself somehow. Couldn't really describe it as metal grinding but there are hints of that too.
I know that is not a lot to go on but I hope the collective will be able to shed some light on it.
Cheers
P.S I've recently had a Camshaft change - inlcuding adjustable pushrods, new followers, oild pump kit - and new modified manifolds as well as all of the associated work that such a job involves
I've had the car back a few weeks now, still totally love it
I have started to notice a strange noise from under the bonnet and annoyingly it is intermitent
As ever it will not do it on demand and I have only managed to catch it twice.I will do my best to describe it. I have only ever noticed it when the car is hot and I have come to a stop. I do not know if it does it when I'm on the move. It is coming from the engine bay, I think. It is almost like an adjustment noise, if that makes sense. Like something under there is adjusting itself somehow. Couldn't really describe it as metal grinding but there are hints of that too.
I know that is not a lot to go on but I hope the collective will be able to shed some light on it.
Cheers
P.S I've recently had a Camshaft change - inlcuding adjustable pushrods, new followers, oild pump kit - and new modified manifolds as well as all of the associated work that such a job involves
Bassfiend229hp said:
Check the bearing on the idler pulley that replaces the PAS pump ... that sounds like how mine first started to sound as it was failing, an intermittent but quite loud grinding sound.
Phil
Cheers Phil, that sounds like a likely culprit.Phil
What would I be checking for, play, movement or something else? Also, where is the idler
I'm not to good at this mechanical stuff.NickM450 said:
Bassfiend229hp said:
Check the bearing on the idler pulley that replaces the PAS pump ... that sounds like how mine first started to sound as it was failing, an intermittent but quite loud grinding sound.
Phil
Cheers Phil, that sounds like a likely culprit.Phil
What would I be checking for, play, movement or something else? Also, where is the idler
I'm not to good at this mechanical stuff.If it is that bearing then a new one is about £60 and is pretty easy to change if you have access to a 10 ton press...
Phil
Bassfiend229hp said:
It sits directly behind the swirl pot and if it seizes while you're driving (as mine did) then it'll pull out of its housing and gouge lumps out of the swirl pot.
If it is that bearing then a new one is about £60 and is pretty easy to change if you have access to a 10 ton press...
Phil
Ohh, what a shame, I only just gave my 10 ton press to a mate of mine. Any other options, the complete pulley maybe, and how do I know if it is the bearing?If it is that bearing then a new one is about £60 and is pretty easy to change if you have access to a 10 ton press...
Phil
NickM450 said:
Bassfiend229hp said:
It sits directly behind the swirl pot and if it seizes while you're driving (as mine did) then it'll pull out of its housing and gouge lumps out of the swirl pot.
If it is that bearing then a new one is about £60 and is pretty easy to change if you have access to a 10 ton press...
Phil
Ohh, what a shame, I only just gave my 10 ton press to a mate of mine. Any other options, the complete pulley maybe, and how do I know if it is the bearing?If it is that bearing then a new one is about £60 and is pretty easy to change if you have access to a 10 ton press...
Phil
I thought I'd found the housing plus bearing at one of the usual TVR parts suppliers but on reading the info it was just the bearing to be pressed into the existing housing.
If it is the bearing then it's pretty obvious if you can get under the bonnet when it's doing it - also you can pop the auxiliary drive belt off and spin the pulley by hand and you'll probably be able to feel if the bearing's gone.
Phil
Bassfiend229hp said:
You can't buy the complete housing nowadays (I guess you might from a breaker).
I thought I'd found the housing plus bearing at one of the usual TVR parts suppliers but on reading the info it was just the bearing to be pressed into the existing housing.
If it is the bearing then it's pretty obvious if you can get under the bonnet when it's doing it - also you can pop the auxiliary drive belt off and spin the pulley by hand and you'll probably be able to feel if the bearing's gone.
Phil
That's a bit of a 'mare then. Looks like another visit to TVRS and a wallet bashing I thought I'd found the housing plus bearing at one of the usual TVR parts suppliers but on reading the info it was just the bearing to be pressed into the existing housing.
If it is the bearing then it's pretty obvious if you can get under the bonnet when it's doing it - also you can pop the auxiliary drive belt off and spin the pulley by hand and you'll probably be able to feel if the bearing's gone.
Phil
I will attempt to check it first though, or at least identify the issue. Would someone be so kind as to point me to the correct pulley to check (I'm guessing it's the one behind the big silver thing, or as you described it, the Swirl Pot):
Is it an easy job to 'pop the auxiliary drive belt off' or is that also best left to the pros?
I had a mystery irregular ticking noise only at idle when hot. Thought it could be spigot bearing, rockers, little ends, pushrod hydraulics, cam end float, you name it, everything. Local TVR garage suggested an engine strip down. One day on start up from cold it sounded like a 26 litre Merlin on tick over or a cracked piston.
It was a 1/2in of exhaust gasget blown out on no 1 cylinder. Confirmed using a short length of garden hose to ear and listening round all the plugs. Big big relief. It costs nothing to check the gasgets first. Hope it's nothing more serious.
Removing the belt is one of the easiest jobs. 14mm spanner to lever back the tension pulley and it slips off easy. Do a drawing first where belt goes over and under all those pulleys. Check the belt does not have any grit in the grooves which may be causing the tick.
It was a 1/2in of exhaust gasget blown out on no 1 cylinder. Confirmed using a short length of garden hose to ear and listening round all the plugs. Big big relief. It costs nothing to check the gasgets first. Hope it's nothing more serious.
Removing the belt is one of the easiest jobs. 14mm spanner to lever back the tension pulley and it slips off easy. Do a drawing first where belt goes over and under all those pulleys. Check the belt does not have any grit in the grooves which may be causing the tick.
Edited by EGB on Sunday 16th June 14:28
NickM450 said:
Thanks for that EGB, it really is more of a grinding noise rather than a tick to be honest.
I will get the Bible out over the weekend and have a go at the releasing the belt...............................
Now, where is that emergency recovery number
You don't need the Bible you need Alex -AKA -Gas Monkey I will get the Bible out over the weekend and have a go at the releasing the belt...............................
Now, where is that emergency recovery number
http://www.youtube.com/watch?v=kfIg2afMts8NickM450 said:
Thanks for that EGB, it really is more of a grinding noise rather than a tick to be honest.
I will get the Bible out over the weekend and have a go at the releasing the belt...............................
Now, where is that emergency recovery number
16mm spanner for tension wheel. I carry oner in boot with spare belt. Belts don't give much trouble though. Hope it's only a alternator bearing. Can be fixed easy.I will get the Bible out over the weekend and have a go at the releasing the belt...............................
Now, where is that emergency recovery number
Sardonicus said:
ou don't need the Bible you need Alex -AKA -Gas Monkey http://www.youtube.com/watch?v=kfIg2afMts8
That sir, is probably the best video I have ever come across on YouTube http://www.youtube.com/watch?v=kfIg2afMts8
Ok, slightly exaggerated there, but still, a very usefull video.Looks easy, even I'm not afraid to do that. Does he do another video on changing the bearings on the auxiliary pulley? Also in a matter of seconds
NickM450 said:
That sir, is probably the best video I have ever come across on YouTube Ok, slightly exaggerated there, but still, a very usefull video.
Looks easy, even I'm not afraid to do that. Does he do another video on changing the bearings on the auxiliary pulley? Also in a matter of seconds
Yes it is the one behind the swirl pot that you pointed out that went and was making an intermittent grinding noise on mine - I limped mine along just sticking grease into it for nearly six months before it failed. Ok, slightly exaggerated there, but still, a very usefull video.Looks easy, even I'm not afraid to do that. Does he do another video on changing the bearings on the auxiliary pulley? Also in a matter of seconds
TBH - if you can get access to the press you let your mate have it's a piece of piss to change ... I got the bearing from www.simplybearings.co.uk and it was a "33052RS Budget Rubber Sealed Double Row Angular Contact Ball Bearing 25 x 62 x 25.4mm" ... was about £33 IIRC.
Of course you need to confirm that it is the idler and that's fairly obvious if you spin the idler pulley by hand once the belt is off.
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