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Author Topic: High RPM sound  (Read 557 times)

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Muroman

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High RPM sound
« on: 01 March 2019, 08:12:10 »

Hello,

3.0 litre Omega has developed this metallic rattling noice above 5000rpms. Oil changed at every 5 000-10 000km or after one year. 262 000km driven. Head gaskets changed at 220 000km and the heads were cleaned but not lifters. Lifters doesn't rattle even when started from -20degrees. Gearbox is fine and she has all the power she ever got.

Lifters or bearings or something else?

In two months it has been 4 years since last cambelt change, and at the moment 42 000 km with that belt, so there is a service coming anyway.
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Driving dark blue - 1999 - MV6 - Automatic
Earlier drive was silver - 1995 - MV6 - Manual

MonzaGSE

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Re: High RPM sound
« Reply #1 on: 01 March 2019, 08:44:21 »

Loose/rusted heatshield somewhere?
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johnnydog

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Re: High RPM sound
« Reply #2 on: 07 March 2019, 16:03:42 »

It is very difficult to diagnose particular a engine noise, as everyone's perception and description of a 'rattle' is different. I would try to get a trustworthy third party to pinpoint the area of the noise ie whether it is the top off the engine, bottom end or a vibration / resonance, or just from an ancillary component. The description you gave doesn't help really without actually hearing it.
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2002 3.2 Elite saloon, 2003 3.2 Elite estate, 2003 2.6 Elite saloon

Muroman

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Re: High RPM sound
« Reply #3 on: 06 April 2019, 19:25:30 »

I have always been very careful with revving engine before fully warmed up, it seems now that even when the thermostat opens it isn't warm enough.

I suspect that the lifters are making the noise just before engine warming up properly. After long highway run there isn't any noise.
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Driving dark blue - 1999 - MV6 - Automatic
Earlier drive was silver - 1995 - MV6 - Manual

henryd

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Re: High RPM sound
« Reply #4 on: 08 April 2019, 16:58:38 »

I think I would be tempted to drop the sump and clean the oil pick up strainer just to make sure its not oil starvation
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