External oil cooler for AW70-transmission in a 240?

  • Thread starter Thread starter Vestman
  • Start date Start date
V

Vestman

Howdy!

My ´85 240 with the AW70 automatic transmission might need an external oil
cooler. I've heard that the one that's originally mounted on some 740's,
fits the 240. Does anyone have more information on this, part#, pictures,
guides...anything? There is virtually nothing about this on google.com.

TIA,
Lars Vestman, Denmark
 
From a point at sea, to the circles of your mind, this is Vestman:
Howdy!

My ´85 240 with the AW70 automatic transmission might need an external oil
cooler. I've heard that the one that's originally mounted on some 740's,
fits the 240. Does anyone have more information on this, part#, pictures,
guides...anything? There is virtually nothing about this on google.com.
Click to expand...

Why do you think you need one? Do you do a lot of towing, do you have
overheating problems, or is it just time for a new radiator?

I've got an external oil cooler on my 740. I don't particularly need
one, but the internal one apparently developed a leak (in fact it was
a false alarm) and I happened to have one lying around. It's just an
aftermarket oil cooler bought from an accessory shop, about 5 inches x
9 inches. It's connected by a couple of rubber hoses and screw cliped
to the oil lines, and mounted in front of the radiator with zip-ties.
I guess this is way over-specified, because the one in the radiator is
only a small cylinder about 1.5 inches in dia. and 6 inches long.

Someone on here mentioned that it might lead to over-cooling in the
winter, but so far I haven't noticed any problems. But maybe your
Danish winters are colder than our British ones.

Given that a leak in the internal cooler could quickly lead to failure
of the gearbox, I reckon on balance an external cooler is not a bad
idea.




--

Stewart Hargrave

Faster than public transport


For email, replace 'SpamOnlyToHere' with my name
 
"Stewart Hargrave":>
Why do you think you need one? Do you do a lot of towing, do you have
overheating problems, or is it just time for a new radiator?
Click to expand...

I have experienced that the tranny-oil have overheated twice (meduim brown
colour), and that by medium quick highway driving after only about 40-70
miles. After that I changed the oil of course, but it happened again... I
think the tranny is a bit sick or worn eventhough it has "only" 151k miles
worth of wear. It also shifts a bit roughly between 2nd and 3rd when pushed
a little. Oil level has always been correct.
I've got an external oil cooler on my 740. I don't particularly need
one, but the internal one apparently developed a leak (in fact it was
a false alarm) and I happened to have one lying around. It's just an
aftermarket oil cooler bought from an accessory shop, about 5 inches x
9 inches. It's connected by a couple of rubber hoses and screw cliped
to the oil lines, and mounted in front of the radiator with zip-ties.
I guess this is way over-specified, because the one in the radiator is
only a small cylinder about 1.5 inches in dia. and 6 inches long.
Click to expand...

Yep, but I've changed the cooler between the incidents, so I reckon that the
cooler is of no guilt what so ever.
Someone on here mentioned that it might lead to over-cooling in the
winter, but so far I haven't noticed any problems. But maybe your
Danish winters are colder than our British ones.
Click to expand...

Oh well, it usually gets down to 5 or 10 degrees of frost. I don't think
that will become an issue.

I just wanna extend the life of it instead of spending 2-300 £ too soon on
an exchange unit.

Rgds,
Lars Vestman, Denmark
 
snip<<
Why do you think you need one?
I guess this is way over-specified, because the one in the radiator is
only a small cylinder about 1.5 inches in dia. and 6 inches long.
Click to expand...
The difference in cooling apacity may be hard to judge based on
physiscal size. Air cooling stuff requires about 100 X more air flow
than cooling water flow, and much bigger surface areas too.
 
From a point at sea, to the circles of your mind, this is
[email protected]:
The difference in cooling apacity may be hard to judge based on
physiscal size. Air cooling stuff requires about 100 X more air flow
than cooling water flow, and much bigger surface areas too.
Click to expand...


This is true, but don't forget that the temperature difference between
oil and air is much greater than oil and water in a warmed up engine.


--

Stewart Hargrave

Faster than public transport


For email, replace 'SpamOnlyToHere' with my name
 
You must log in or register to reply here.
Back
Top