Re: Bad rod bearing?

[John Lagnese <jlagnese@cybertours.com>]

Hi,
You can always get something solid, like a large screwdriver or ratchet and put
it against the oilpan while the engine is running and listen to see if it gets
much louder.
John

scirokn81 wrote:

> Jonas,
>
> It definitely sounded like a rod bearing.
> I'd pull the bearing caps and look for damage to the bearings.
> When you take the bearing caps off check for spun bearings and look at cap
> and the crank bearing surfaces?
> If I remember right the bearings are a much softer metal than the crank, so
> the crank should not see much damage, right?
> It the rod bearing had spun you would know right away because the bearings
> would either double up on the cap side, or the rod side.
>
> Can any VW (or other) mechanics out there give us a brief description on how
> to replace the rod bearings with ones of the proper thickness if it isn't
> spun, or what to do if it is? My father helped me with the only spun rod
> bearing I have ever encountered 10+ years ago and can't remember what we did
> to fix it.
>
> We need to get Jonas to the show preferably without sounding like a diesel
> 8)
>
> Thanks,
> Randy B
> 81 Cosmos Scirocco S - 2.0 16V project
> 81 Mars Scirocco S - tt 1847cc 8V
> 87 gold Scirocco 16V - parts for Cosmos project
>
> > Ok, so here's the story.
> >
> > I'm cruising back from LA up to the Bay Area last weekend and decided to
> > make good time. So I wind-tunnel behind various large pick-ups and SUV's
> in
> > the 90-95 mph range. I do this for about 45 minutes. It is a hot day and
> oil
> > temps get up to about 120 C. Water temp is 3/4 to the top. I keep a close
> > eye on oil pressure and it never got below 45psi.
> >
> > I stop for dinner and gas, and as I pull in, I notice a slight noise from
> > the motor. VERY background, didn't think much of it.
> >
> > Drive the rest of the 150 miles back and when I get home there is a BAD
> > noise. Directly RPM dependent, like heavy metal things knocking around.
> >
> > I have since only driven the car once, and that was to pick up my "Team
> > Scirocco" hat from Randy Block (Bad Ass BTW). He suggested that it could
> be
> > a bad rod bearing, as that is similar to (but not as loud) as the noise
> when
> > he spun a bearing.
> >
> > I checked the valve lash, and they are all nice and tight. I also pulled
> the
> > oil pan to check for any metal debris in the oil, I found none. From what
> I
> > could tell, the cylinder walls looked fine (but it was hard to tell, with
> > the crank and rods in the way)
> >
> > So, does anyone have some advice on how to fix it. Plastigauge? Rod
> bearings
> > are cheap ($25 a set) Is that for 1 rod or 4 rods? If I replace them
> should
> > I break in the motor as if new, or what. Should I do all 4 or just the one
> > that is bad? Can I do this with the motor in the car?
> >
> > I want this fixed before ND, so that leaves me less than 2 weeks.
> >
> >
> > TIA
> >
> > Jonas
> > 85 Scirocco 2.0
> > For direct reply: jonas@metabolex.com
> > http://www.geocities.com/scirocco2l8v
> > ________________________________________________________________________
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> >
> >
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