Re: 5 cyl timing belt questions

["Scott Mo." <scottmo@teleport.com>]

From: Wallace White <wallace@remdesign.com>
Subject: 5 cyl timing belt questions
Date: Thu, 18 Feb 1999 22:05:21 -0800
- Locking compound vs. corrosion inhibitor on crankshaft bolt. At least
>one message has said to put a locking compound on the bolt, while the
>Bentley calls for corrosion inhibitor AMV 188 000 (actually, it uses
>different numbers of different pages...). Is a general anti-seize the
>right thing to use here, on the upper threads and face?

On all of the crankshaft bolts I have removed while doing timing belts,
there is what appears to be locking compound all over the bolt threads,
bolt shaft and face. I usually have to wire brush this stuff off the bolt
because it has bonded itself to the bolt threads and shaft. 

It certainly does not appear to be any simple lubricant or anti corrosion
or anti-seize goo. I have never seen this AMV 188 100 02 or AMV 188 101 02
"anti corrosion" compound before but the original stuff used on the bolt
sure looks similar to medium strength blue Loctite "242". I have used this
blue Loctite on all the crankshaft bolts/timing belt jobs without concern. 

Has anyone ever seen a cross reference chart for all those odd ball VW/Audi
lubricant part designations like AMV 188 100 02 "anti-Corrosion" or G 000
100 grease?

>- Water pump O-ring. I've read that it should be glued in place; if so,
>what kind of glue is appropriate?

On my web page, I mention gluing the O-Ring in place, (i.e. glue it to the
inside of the groove in the water pump) only because I have seen others
have trouble with them when the O-Ring comes out of the groove while
installing the water pump. You don't often know when the O-ring pops out,
you only know it later when the thing leaks like a sieve after refilling
the system. 

I use a small amount of weatherstrip adhesive, (sparingly) on the inside of
the water pump groove to just help keep the O-ring inside the groove of the
water pump. You don't want to get any glue on the face of the O-Ring where
it contacts the engine block. 

If you are careful, and can see the O-ring is in place, while you install
the w-pump, you can forgo the use of the glue.

Note, that there are two different size O-rings available, 4mm and 5mm, I
believe the 5mm O-Ring was spec'd for the rebuilt water pumps that Audi was
using.

I also use a little grease on the block or face of the O-ring to allow the
water pump to pivot against the engine block when adjusting the timing belt
tension. Coolant could also be used as a lubricant. I suppose you could
also put a little silicone rubber sealer on the block or O-ring if the
block suffers from corrosion at that point.

HTH

Scott Mockry

http://www.teleport.com/~scottmo