"jon" <jon.harding@zetnetdotcodotuk> wrote in message
news:
[email protected]...
>
> "Badger" <[email protected]> wrote in message
> news:[email protected]...
> >
> > "jon" <jon.harding@zetnetdotcodotuk> wrote in message
> > news:[email protected]...
> >> hi hope someone in here can help
> >>
> >> got a knocking after about 5 mins from the righthand bank
> >>
> >> new lifters and a new cam
> >>
> >> knock still there
> >>
> >> replaced the rocker arms
> >>
> >> knock still there
> >>
> >> any ideas ?
> >>
> >> its still got all the power but the knocking is doing my head in
> >>
> >> many thanks
> >>
> >> jon
> >
> > It's possible that what you are hearing is "cam walk", a knocking noise
> > caused by the camshaft walking back and forward slightly in the block as
> > it
> > rotates. This only tends to occur on engines with a keeper plate style
of
> > location on the front of the cam though, serpentine belted engines
> > onwards.
> > Land rover actually had a form of recall / tech bulletin about this on
> > early
> > Disco II and P38 models.
> > It's also possible that it could be one of the follwing:- small-end,
> > piston
> > slap, crank bearings or camshaft bearings, but it's hard to diagnose
> > without
> > actually hearing it.
> > Badger.
> > B.H.Engineering,
> > Rover V8 engine specialists.
> > www.bhengineering.co.uk
> > www.roverv8engines.com
> >
> >
> >
> thanks for the info people
>
> need to work out the costs 
(
>
> thanks
Thinking further, it's unlikely to be piston slap, that normally manifests
itself instantly on cold start and goes away in varying degrees as the
engine reaches working temp and everything expands with the heat.
How loud a knock is it? Is it a dull knock audible with the stereo on, or is
it relatively quiet but just that you are more aware of it? It might be
worth getting an oil pressure test carried out on it to see if the pressure
is excessively low (less than 7 or 8psi at idle or 25ish at 2400rpm), also
worth a quick check to see that the front pulley bolt is tight!
If it has a dizzy, remove the cap and turn the engine with a socket on the
front pulley - turn it back and forward and see how many degrees it moves to
take up any slack before the dizzy turns. Any more than about 5 degrees and
the cam chain is stretched, which will give rise to a knock also.
Badger.
