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Old 01-13-2006, 10:01   #1 (permalink)
Dom J
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Leaky rocker covers


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



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Old 01-14-2006, 10:01   #2 (permalink)
TonyB
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Re: Leaky rocker covers

> 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?.


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


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Old 01-14-2006, 12:01   #3 (permalink)
Badger
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Re: Leaky rocker covers


"TonyB" <Norfolk@soxclara.co.uk> wrote in message
news:dqbc2u$3iq$1@nwrdmz03.dmz.ncs.ea.ibs-infra.bt.com...
>> 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?.

>
> 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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