My first thought was a CV joint. You probably would have noticed a broken axle, and it would be noisy all the time.
The "lawnmower" noise will more than likely be the manifold gasket. Mine wasn't noisy, but when I took the manifold off, the one-piece gasket had mysteriously transformed into a three-piece one.
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1999 Disco TD5 ("Bluey")
1996 Disco 300 TDi ("Slo-Mo")
1995 P38A 4.6 HSE ("The Limo")
1966 No 5 Trailer (ARN 173 075) soon to be camper
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