[V8] Valve or Timing Belt Rattle?

[dsaad at icehouse.net]

The fan bearing and oil pump bearing are in fact the same. It is a flange mount
bearing.
I believe it is the oil pump version that costs less from the dealer - because
the fan bearing comes with the threaded mount for the viscous clutch. Unless you
need this part, then order the oil pump bearing for both applications. I think I
paid just under $100 for this part a few years ago.

Dave



Quoting daves745t at optonline.net:

> Is the Oil Pump Pulley Bearing the same thing as the Oil Pump Drive Bearing
> listed on AudiConnection? If so, I did have that replaced as part of the
> T-belt service.
>
> One thing I don't think I had replaced was either the Viscous Fan Bearing or
> Viscous Fan Clutch.  That was listed on AudiConnection under "Optional Timing
> Belt Kit Items" and while I opted to have the Serpentine Belt and Rollers
> replaced, I didn't do the Viscous Clutch or Bearing.  Could that also be a
> possiblity?
>
> -DaveM
>
> Subject: Re: [V8] Valve or Timing Belt Rattle?
> To: V8 at audifans.com
> Message-ID: <1115650308.427f7904654a5 at webmail.icehouse.net>
> Content-Type: text/plain; charset=ISO-8859-1
>
>
> I had a similar sound - and after much debugging, it ended up being the oil
> pump
> drive bearing. That un-fortunately requires a very complete teardown - the
> t-belt has to be removed. Depending on what tools you have, the front cover
> also
> has to come off.
>
> If it were me - I would first remove the accessory belt to see if the noise
> goes
> away. Any problem here will be pretty easy to ID and fix. If the noise is
> still
> there, you are probably looking at the one piece that was not replaced when
> you
> did the t-belt - the oil pump bearing. If this does turn out to be the
> diagnosis, I would recomend removing the front cover so you can replace all
> the
> gaskets and o-rings in there. This in turn also requires dropping the lower
> oil
> pan. It adds considerably to parts and labor cost, but you get a nice dry
> motor
> out of the deal. One advantage is that no special tools are needed. If you
> choose to replace the bearing only then you could easily end up with a oil
> leak.
> Changing the bearing seal in place requires special tools.
>
> I would also give a lot of thought to replacing the cam chains while you are
> in
> there. I neglected to do that and wish I would have. I don't know how far
> these
> chains should last, but they are not that expensive.
>
> BTDT.
>
>
>
>
>