[DML] Re: Cam Wear cause (soft camshafts

["content22207" <brobertson@xxxxxxxxxxxx>]

For some reason this rumor is endemic in the DeLorean community and
simply refuses to die (quite ironic when you consider DeLo usage
accounts for only .8% of total PRV production). There is no difference
in camshaft composition between various B27/B28 applications. The only
words Volvo ever printed on the subject were to substitute 10W30 oil
over the previous 10W40 spec (retroactive to the beginning of PRV
usage). Thicker oil has a tendency to gum up camshaft/rocker arm
orifices. Note that the rocker arm orifices are located at the
camshaft lobes, not the valve stems -- quite possibly the source of
characteristic valve noise.






>--- In dmcnews@xxxxxxxxxxxxxxx, <rvparty@xxxx> wrote:
> I've read the archives and understand that the early Volvo's suffered
> from excessive cam wear and that the DeLorean version uses hardened cams
> and therefore don't have the same problem.  My passenger cam used to
> have a loud ticking noise until I adjusted the rocker arms and I was
> surprised at how much quieter the engine was.  That was 6 months ago,
> and recently the engine redeveloped the ticking noise and I adjusted
> again.  Less than a month later it is back and getting louder.  I'm
> pretty sure that this is indicating that I'm experiencing excessive
> wear.  The cam is well saturated with oil when I remove the cover so I'm
> wondering what might be causing the cam to wear so badly so that I can
> fix the cause when I replace the cam.  Are there a set of causes that
> could make the cam wear or is this a case of the cam being damaged in
> the past and just needs to be replaced, nothing else?
>  
> Thanks!
> Jeff
> #10544
> 
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