Re: Bad rod bearing?

["scirokn81" <scirokn81@email.msn.com>]

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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