Hi all, I know that the broken radiator neck is a common problem. Seems
though that I've still got an inch or so of neck left which I've clamped
the hose onto. Is there any problem with this that I'm not aware of?
Appears to work allright.
ps if it's recomended to replace the radiator, there is often talk of oil
cooler lines in that vicinity that need to be disconnected. Is that the
case in a 300e (1989) as well? Do possible oil lines just need to be
disconnected from the radiator or actually opend?
For now. Many people have tried to repair this to no avail. The price for
failure here is high. One guy did clean it scrupulously, apply JB weld
then wrapped the whole neck in thin metal and that's worked.
But most people replace the rad. They're not too bad mail-order.
I've never had a 300E but in 108's/126's there's an oil cooler on the
side of the rad. It's a separate unit and have never heard of one failing.
Need Mercedes parts? http://parts.mbz.org
Richard Sexton | Mercedes stuff: http://mbz.org
If I were going to attempt a repair, I think I would find a metal sleeve
that I could insert into the existing neck segment, then I would use a
silicone rubber adhesive to seal it neck back together again, with the piece
that broke off.
You may also put a sleeve on the outside of the repair to give added
Replacement may be a better option. But if I understand the cause of these
failures often it is the type of anti-freeze that causes the plastic to
If your car is equipped with an oxygen sensor be sure to select a grade of
silicone that is listed as safe for these as it is my understanding that it
does not take much vapor from the curing rubber to kill off the ox sensor.
If knowledge is power, and power corrupts, what does this say about the
Plastic is impervious to alot of things.. what cause the breakage most of
the time is the expansion and contraction of plastic to the point it become
Other reason for breaking is the radiator hose clamp is tightened too much
that it will hasten the process.
I own an '89 300E, my radiator broke the same way. Unless you can
create another lip on the break area, replacement is best. I replaced
mine in about 15 minutes. It cost 135 bucks online for a new radiator.
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