Not sure if i posted about this before but my V8 Disco (3.9Efi) smelt badly of hot oil 'tother day. A quick nose under the bonnet revealed oil on the block coming from the rocker cover join. Tightened the bolts for each cover (6 of them were very loose indeed) over a month ago. How can i prevent the bolts from coming undone/looseing, or is this a usual problem on this type of engine?.
Dom J
I think it's usual. As the rubber compresses over time it loses it's springiness and requires the occasional tighten. When that fails to cure the problem it's time for a new seal. LR suggest a change after every three removals anyway.
TonyB
The old cork gaskets are cheap, and if fitted correctly will not leak. Clean the gasket recess on each cover, ensure totally oil-free (brake cleaner works extremely well), apply a thin smear of silicon sealant and allow to partially cure for say 15 minutes, apply gasket and smooth down into silicon, wait 30 minutes until cured then fit to engine and tighten screws progressively until fully tightened. Job done. FWIW, most leakages reported when using cork gaskets are either because the gasket hasn't been held in the correct place by silicon (or similar) and has slipped on fitment, or, because someone has overtightened one screw before the others were evenly nipped up and allowed part of the gasket to become over-compressed. Badger.
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