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From: larry moe 'n curly on 6 Jan 2010 04:11


Uncle_vito wrote:
>
larrymoencurly wrote:
>
> > Plastic radiator tanks are made of fiberglass-reinforced nylon and are
> > best repaired by welding more of the same material into the crack.
> > The worst thing you can do is try super glue because it doesn't stick
> > well enough to fix the crack but does stick well enough to make it
> > hard to remove the glue so you can do a proper repair.
> >
> > Apparently GM dealers sell radiator repair rod made of this material,
> > and radiator supply houses should have it as well.
>
> Those cracks expand and contract with each engine run cycle. I do not see
> any way how that repair would hold.
>
> On the internet many of those OEM radiators can be had new for cheap.
>
> That is what I would do.

It's not going to crack again unless the repair didn't melt the nylon
deeply enough. After all this is nylon, one of the best plastics for
repair by this method, and some people are short on money to afford
even the cheapest radiator.
From: Ray O on 6 Jan 2010 12:42

"larry moe 'n curly" <larrymoencurly(a)my-deja.com> wrote in message
news:ccc99499-4061-4fd3-90b4-b1179056fd46(a)r24g2000yqd.googlegroups.com...
>
>
> Uncle_vito wrote:
>>
> larrymoencurly wrote:
>>
>> > Plastic radiator tanks are made of fiberglass-reinforced nylon and are
>> > best repaired by welding more of the same material into the crack.
>> > The worst thing you can do is try super glue because it doesn't stick
>> > well enough to fix the crack but does stick well enough to make it
>> > hard to remove the glue so you can do a proper repair.
>> >
>> > Apparently GM dealers sell radiator repair rod made of this material,
>> > and radiator supply houses should have it as well.
>>
>> Those cracks expand and contract with each engine run cycle. I do not
>> see
>> any way how that repair would hold.
>>
>> On the internet many of those OEM radiators can be had new for cheap.
>>
>> That is what I would do.
>
> It's not going to crack again unless the repair didn't melt the nylon
> deeply enough. After all this is nylon, one of the best plastics for
> repair by this method, and some people are short on money to afford
> even the cheapest radiator.

The concern I would have when deciding whether to repair a crack or hole or
to replace the tank or entire radiator is what caused the crack or hole to
appear in the first place and the general condition of the radiator.

If the crack appeared because of fatigue and old age, then there is a fair
chance that other cracks will appear, and if the radiator core is in bad or
marginal shape, then it is probably better to just replace it.

If a crack appears in the tank due to physical damage, then repairing the
crack is probably a worthwhile approach.
--

Ray O
(correct punctuation to reply)


From: croy on 9 Jan 2010 12:44
On Wed, 6 Jan 2010 11:42:49 -0600, "Ray O"
<rokigawa(a)NOSPAMtristarassociates.com> wrote:


>The concern I would have when deciding whether to repair a crack or hole or
>to replace the tank or entire radiator is what caused the crack or hole to
>appear in the first place and the general condition of the radiator.
>
>If the crack appeared because of fatigue and old age, then there is a fair
>chance that other cracks will appear, and if the radiator core is in bad or
>marginal shape, then it is probably better to just replace it.
>
>If a crack appears in the tank due to physical damage, then repairing the
>crack is probably a worthwhile approach.

I'm not a mechanic, and I've never even heard of "plastic"
radiators.

Are you saying that this presumably recent type of radiator
is sometimes already showing fatigue/aging cracks? How long
have these things been around?

Sounds like a wrong turn in the design department.

--
croy
From: Hachiroku ハチロク on 9 Jan 2010 12:31
On Sat, 09 Jan 2010 09:44:13 -0800, croy wrote:

> On Wed, 6 Jan 2010 11:42:49 -0600, "Ray O"
> <rokigawa(a)NOSPAMtristarassociates.com> wrote:
>
>
>>The concern I would have when deciding whether to repair a crack or hole
>>or to replace the tank or entire radiator is what caused the crack or
>>hole to appear in the first place and the general condition of the
>>radiator.
>>
>>If the crack appeared because of fatigue and old age, then there is a
>>fair chance that other cracks will appear, and if the radiator core is in
>>bad or marginal shape, then it is probably better to just replace it.
>>
>>If a crack appears in the tank due to physical damage, then repairing the
>>crack is probably a worthwhile approach.
>
> I'm not a mechanic, and I've never even heard of "plastic" radiators.
>
> Are you saying that this presumably recent type of radiator is sometimes
> already showing fatigue/aging cracks? How long have these things been
> around?

My '88 Supra has one, original from the factory...it now has a small
cvrack in the top of it.



>
> Sounds like a wrong turn in the design department.

From: Ray O on 9 Jan 2010 21:58

"croy" <hate(a)spam.invalid.net> wrote in message
news:vrfhk5tvv9n6fiqbh3j4u7e7n1baqlg8n5(a)4ax.com...
> On Wed, 6 Jan 2010 11:42:49 -0600, "Ray O"
> <rokigawa(a)NOSPAMtristarassociates.com> wrote:
>
>
>>The concern I would have when deciding whether to repair a crack or hole
>>or
>>to replace the tank or entire radiator is what caused the crack or hole to
>>appear in the first place and the general condition of the radiator.
>>
>>If the crack appeared because of fatigue and old age, then there is a fair
>>chance that other cracks will appear, and if the radiator core is in bad
>>or
>>marginal shape, then it is probably better to just replace it.
>>
>>If a crack appears in the tank due to physical damage, then repairing the
>>crack is probably a worthwhile approach.
>
> I'm not a mechanic, and I've never even heard of "plastic"
> radiators.
>
> Are you saying that this presumably recent type of radiator
> is sometimes already showing fatigue/aging cracks? How long
> have these things been around?
>
> Sounds like a wrong turn in the design department.
>
> --
> croy

The entire radiator is not plastic. Just the tanks at the inlet and outlet
are made of plastic; the core is more conventional construction.

I'm not sure what time frame you consider to be recent, but radiators with
plastic tanks have been around for over 20 years. IIRC, they were pioneered
by GM.

Problems like the OP is describing is pretty rare, especially in Toyotas.
The radiator in the OP's Avalon was sourced in the U.S. Perhaps the lack of
problems with the tanks is why you have never heard of them. The most
common cause of radiator failure other than collision damage is lack of
coolant changes, which allows corrosion to build up in the metal core, and
the use of plastic reduces sources of sediment from corrosion. The next
most common cause of radiator failure is corrosion of the metal band that is
used to clamp the tanks to the core. In other words, the use of plastic
tanks has not been a significant cause of radiator failures, and the use of
lighter materials helps reduce the weight of the vehicle, which helps
improve fuel economy and performance.
--

Ray O
(correct punctuation to reply)


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