Omega Owners Forum
Chat Area => General Car Chat => Topic started by: Crazycarzowner on 29 March 2015, 20:32:08
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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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Which engine is it?
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3.9 v8
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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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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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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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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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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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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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Result.......... :y :y
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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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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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Sometimes, OOF manages to surprise me. Great news :y
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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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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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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.
I don't recall saying they did :y although the followers have a habit of getting a bit clacky
Shit job to change though with the timing cover coming off. inlets out, valley gasket off and pre-loads to reset on the rocker assembly, the chains can make a hell of a noise to when worn ....then you find if its the pre 4.0/4.6 (composite head gasket with additional row of head bolts, non cross bolt block) that the head gaskets are blowing into the valley and the internals look like someone dumped a spade full of soil in them :y
Of course the chain and sprockets will also need changing and the rocker shafts will probably be pretty worn to.
Oh the joys of the (ancient and should have been retired in the late 80's) Buick 215 Rover V8
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Does it have the gas conversion
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No, no Gas conversion yet.... Until I've rebuild the top end & stopped the
Land Rover self preservation / protection system or oil leaks as they are aka......... ::) ::) ::)
Had the spider alarm system out today too as I've still got that annoying 3-4 second pause when you turn the key to fire it. Fitted a bypass temporarily, to see if it cured it, but nope, it still does it but its at least ruled out the spider. Now on to check the earths as my next task.
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Don't put the gas conversion on it the back 2 pots will end up burning out thats why I asked if it was gas converted :y