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Author Topic: Question re. my Discovery  (Read 4452 times)

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Crazycarzowner

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Question re. my Discovery
« on: 29 March 2015, 20:32:08 »
Right, now then I know I've had a metallic tapping noise coming from the left bank of the Disco for a while, not really getting any worse but annoying. I've listened to it several times and it doesn't sound like a lifter but I can't put my finger on it. It doesn't do it at idle just on acceleration from about 1500 - 2000rpm, then goes away as and when the revs increase.

I'm thinking possibly a cylinder liner perhaps??? Only other thing I can think of. There are no other issues ie. using oil or water, temp gauge sits at normal & I'm at a bit of a loss really. I know I'll probably find out when I strip the engine, but I did plan on using it for a while until I purchase a Skoda replacement................When I eventually get the cheque  ::) ::) ::)
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4x4

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Re: Question re. my Discovery
« Reply #1 on: 29 March 2015, 20:43:01 »
Which engine is it?
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Crazycarzowner

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Re: Question re. my Discovery
« Reply #2 on: 29 March 2015, 20:49:19 »
3.9 v8
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Andy H

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Re: Question re. my Discovery
« Reply #3 on: 29 March 2015, 20:58:58 »
When my Range Rover makes that noise I tighten up the bolts between the exhaust manifolds and the heads and the noise goes away for a while.

Cast iron Rover manifolds are a bit fragile so I don't want to overtighten the bolts just in case........
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"Deja Moo - The feeling that you've heard this bull somewhere before."

Nick W

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Re: Question re. my Discovery
« Reply #4 on: 29 March 2015, 21:03:33 »
Pull the valve covers and check that all the valves are opening fully. Round camlobes on the rear cylinders are a fact of life with Rover V8s. But they hide it so well that it's hard to tell without a physical check.
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Crazycarzowner

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Re: Question re. my Discovery
« Reply #5 on: 29 March 2015, 21:31:30 »
Ohh!! that might be a good shout Andy H, I'll check them in the morning. Yeah Nick W I know what you mean about the cams, but the engine itself is quite low mileage 75k. Gonna try the fanimoulds first & go from there I think.
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the alarming man

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Re: Question re. my Discovery
« Reply #6 on: 29 March 2015, 23:19:58 »
I would try the manifolds first as my old 86,000 v8 did it until I replaced all the gaskets...then saying that nick is right but always try the cheapest method first :y
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Marks DTM Calib

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Re: Question re. my Discovery
« Reply #7 on: 30 March 2015, 08:09:22 »
Quote from: Jasonm on 29 March 2015, 21:31:30
Ohh!! that might be a good shout Andy H, I'll check them in the morning. Yeah Nick W I know what you mean about the cams, but the engine itself is quite low mileage 75k. Gonna try the fanimoulds first & go from there I think.

Cams and followers plus chain setup are normally pretty shot by 60K miles.

Check the exhaust manifolds first (there were some improved gaskets for them due to this issue)
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Crazycarzowner

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Re: Question re. my Discovery
« Reply #8 on: 30 March 2015, 14:25:51 »
Quote from: Andy H on 29 March 2015, 20:58:58
When my Range Rover makes that noise I tighten up the bolts between the exhaust manifolds and the heads and the noise goes away for a while.

Cast iron Rover manifolds are a bit fragile so I don't want to overtighten the bolts just in case........


Give that man a Mars Bar  :y :y :y :y :y :) :) :) :)


Had a look under the bonnet earlier this morning & 3-4 of the rear-most left hand bank of fannimold bolts were loose. Found the correct socket, prised the retaining flap off and nipped em all up! Runs quiet as a mouse now  8) 8) 8)

Thanks Andy H  :y ;)
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Vamps

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Re: Question re. my Discovery
« Reply #9 on: 30 March 2015, 21:15:17 »
Result.......... :y :y
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Andy H

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Re: Question re. my Discovery
« Reply #10 on: 30 March 2015, 21:29:51 »
Quote from: Marks DTM Calib on 30 March 2015, 08:09:22
Quote from: Jasonm on 29 March 2015, 21:31:30
Ohh!! that might be a good shout Andy H, I'll check them in the morning. Yeah Nick W I know what you mean about the cams, but the engine itself is quite low mileage 75k. Gonna try the fanimoulds first & go from there I think.

Cams and followers plus chain setup are normally pretty shot by 60K miles.

Check the exhaust manifolds first (there were some improved gaskets for them due to this issue)
It is true that the cam lobes can wear to almost nothing but they don't make much noise as a result. There is only one cam so a new replacement isn't ridiculously expensive.
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Andy H

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Re: Question re. my Discovery
« Reply #11 on: 30 March 2015, 21:48:59 »
Quote from: Jasonm on 30 March 2015, 14:25:51
Quote from: Andy H on 29 March 2015, 20:58:58
When my Range Rover makes that noise I tighten up the bolts between the exhaust manifolds and the heads and the noise goes away for a while.

Cast iron Rover manifolds are a bit fragile so I don't want to overtighten the bolts just in case........


Give that man a Mars Bar  :y :y :y :y :y :) :) :) :)


Had a look under the bonnet earlier this morning & 3-4 of the rear-most left hand bank of fannimold bolts were loose. Found the correct socket, prised the retaining flap off and nipped em all up! Runs quiet as a mouse now  8) 8) 8)

Thanks Andy H  :y ;)
You're welcome. :y
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"Deja Moo - The feeling that you've heard this bull somewhere before."

TheBoy

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Re: Question re. my Discovery
« Reply #12 on: 31 March 2015, 18:16:02 »
Sometimes, OOF manages to surprise me. Great news :y
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Crazycarzowner

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Re: Question re. my Discovery
« Reply #13 on: 31 March 2015, 19:10:15 »
Its certainly the best forum for help regarding any vehicle, as well as the Omega. I'm a member of the Discovery club & posted the same, still had no replies yet!!!
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Marks DTM Calib

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Re: Question re. my Discovery
« Reply #14 on: 01 April 2015, 12:14:32 »
There are some improved manifold gaskets, have fitted them to two TVR's (which suffer this issue far more due to the swept manifolds)
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