May / June 2015
17
that need to be installed in the block. They
are a rubber/metal seal that allow coolant to
pass from one side of the block to the other.
The reason I mention these is that there has
been a lot of talk about "lifetime" coolant.
The metal in these seals will degrade if there
are impurities in the coolant. Once those
degrade, they will start to leak and this is one
of the 28 or so failure modes of these engines,
causing a coolant/oil intermix problem. Not
good. Keep your coolant fresh every 5 years
or so. If you own an M96/M97 engine, this
should not be a problem as you should be
replacing your waterpump as a preventative
measure every 3-4 years, which means you
will be replacing the coolant that often.
The next step is to lower the other block
half onto the motor and secure in place. The
case halves are bolted and sealed together
with a lot of bolts. This leaves three
connecting rods inside the cylinders on
bank two, and 3 pistons still sitting on your
bench. How to connect these together is the
trickiest part of rebuilding these engines,
and many professionals have screwed up big
time here. If you make a mistake with the
wrist pin insertion, then you have to unbolt
the case halves, separate the two to fish out
your wrist pin clip, clean everything, put it
all back together and try again. Since you
have three rods to connect, you have three
opportunities to screw it up. Since that is
a pretty extensive procedure, we will tackle
that process next issue ;)
- KARL
I'd like to thank Karl for his
long history of editorial con-
tribution. If you have a topic
you would like him to cover,
or question to answer please
email him at porschedoc@
rennsportkc.com. And Karl,
you can be late on your article
any time - Editor.
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