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Old 03-21-2005, 01:13   #1 (permalink)
jamsan
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Ser III radiator

Hi all
I have had a year of trying to solve overheating problems on my 1973 109".
Just had a look at a 1983 version with same engine but the radiator was
nearly twice as thick as mine!
Is it possible that the 2,25 of old had a thinner radiator or have I got
something wrong fitted to my machine?

James


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Old 03-21-2005, 01:13   #2 (permalink)
EMB
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Re: Ser III radiator

jamsan wrote:
> Hi all
> I have had a year of trying to solve overheating problems on my 1973 109".
> Just had a look at a 1983 version with same engine but the radiator was
> nearly twice as thick as mine!
> Is it possible that the 2,25 of old had a thinner radiator or have I got
> something wrong fitted to my machine?


Which part is thicker? My earlier Series vehicles have had radiators
with a bigger (front to rear) top tank and large filler cap, but the
core itself is only half that thickness, and the later ones have a
smaller top tank with small filler cap, but the core is still a similar
dimension.

I have had Series radiators re-cored with a thicker core (extra row of
tubes) to get better cooling for some of the engine conversions I've
done, but that has always been a special order item.

--
EMB
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Old 03-21-2005, 01:13   #3 (permalink)
JD
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Re: Ser III radiator

jamsan wrote:

> Hi all
> I have had a year of trying to solve overheating problems on my 1973 109".
> Just had a look at a 1983 version with same engine but the radiator was
> nearly twice as thick as mine!
> Is it possible that the 2,25 of old had a thinner radiator or have I got
> something wrong fitted to my machine?
>
> James


I seem to remember there were two thicknesses of radiator, probably
optional. But the thinner one is quite adequate provided there is no other
problem unless you live in a very hot climate and use the vehicle
stationary with a PTO etc. If you live in a normal climate - temperatures
rarely above 40C - and use the vehicle for normal purposes the thinner
radiator is adequate. But it has less spare capacity to cope with loss of
cooling such as partial blockage of air or water passages or excessive heat
due to incorrect timing.
Note that there are other problems that will cause overheating regardless of
the radiator - these include coolant leaks, eroded water pump impeller,
loss of pressurisation, faulty hoses, faulty thermostat, leaking head
gasket. But you will probably have looked at most of these.
JD
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Old 03-21-2005, 01:13   #4 (permalink)
jamsan
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Re: Ser III radiator

I only looked at the top tank which was bigger front to rear but I just
assumed the core would be as thick as the tank top. Didn't look that close
though.

EMB <embtwo@gmail.com> wrote in message news:d0q771$nqq$1@lust.ihug.co.nz...
> jamsan wrote:
> > Hi all
> > I have had a year of trying to solve overheating problems on my 1973

109".
> > Just had a look at a 1983 version with same engine but the radiator was
> > nearly twice as thick as mine!
> > Is it possible that the 2,25 of old had a thinner radiator or have I got
> > something wrong fitted to my machine?

>
> Which part is thicker? My earlier Series vehicles have had radiators
> with a bigger (front to rear) top tank and large filler cap, but the
> core itself is only half that thickness, and the later ones have a
> smaller top tank with small filler cap, but the core is still a similar
> dimension.
>
> I have had Series radiators re-cored with a thicker core (extra row of
> tubes) to get better cooling for some of the engine conversions I've
> done, but that has always been a special order item.
>
> --
> EMB



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Old 03-21-2005, 01:13   #5 (permalink)
jamsan
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Posts: n/a
Re: Ser III radiator

Yep
Tried everything.
I still have to solve a very high oil pressure problem that I am convinced
is overheating the oil via the relief valve and causing a higher engine
temp.
I still have to check the relief valve spring at the oil cooler to see if
maybe too long or tight.
As I said before once, when I o-hauled the motor I found the relief valve
ball missing in the oil pump and I refitted a loose ball from a broken
bearing I found and this increased the oil pressure from a max of 3 Bar to
now 7 bar at revs and even when warm.
This leads me to think the oil is relieving too high at the oil cooler
relief (thanks Dougal).

James
JD <jjd@SPAMLESS.com.au> wrote in message news:4230a3cd@dnews.tpgi.com.au...
> jamsan wrote:
>
> > Hi all
> > I have had a year of trying to solve overheating problems on my 1973

109".
> > Just had a look at a 1983 version with same engine but the radiator was
> > nearly twice as thick as mine!
> > Is it possible that the 2,25 of old had a thinner radiator or have I got
> > something wrong fitted to my machine?
> >
> > James

>
> I seem to remember there were two thicknesses of radiator, probably
> optional. But the thinner one is quite adequate provided there is no other
> problem unless you live in a very hot climate and use the vehicle
> stationary with a PTO etc. If you live in a normal climate - temperatures
> rarely above 40C - and use the vehicle for normal purposes the thinner
> radiator is adequate. But it has less spare capacity to cope with loss of
> cooling such as partial blockage of air or water passages or excessive

heat
> due to incorrect timing.
> Note that there are other problems that will cause overheating regardless

of
> the radiator - these include coolant leaks, eroded water pump impeller,
> loss of pressurisation, faulty hoses, faulty thermostat, leaking head
> gasket. But you will probably have looked at most of these.
> JD



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