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Re: Grinding noise on acceleration, all gears, quiet when upto speed, manual Laguna I
Before I started stripping down the gearbox I would carefully check the engine mountings - not sure about the v6 but most renaults have 3 - 1 top right, 1 on top of the gearbox & one right underneath between the diff & body.
Any floppiness in these mountings would be worse under full engine power & might let engine or exhaust touch the underbody somewhere making the noise you describe?
Its just that a check like this costs nothing. Renault engine mountings have been known to fail - ask any owner of an old DCi Scenic for example
Currently in Hammer-ter's garage:
Scenic III 1.2 TCe 115 2012, Clio III 1.2 TCe 2011, Peugeot 207 1.6 HDI90 2009