Auto transmission oil cooler
Guys ... I've started putting together my G which means I'll be bothering you with questions ... and this one is for gearbox oil cooling ...
The standard transmission oil cooler is integrated to the radiator which at high temperatures, high loads, high speeds seems to be inadequate.
For example after long high-speed (very relative term with the 460 - meaning high engine speed) in high temperatures, the gearbox will show slip when changing gears until everything cools down. During winter it's ok.
I've purchased a small Setrab transmission oil cooler which I'll fit in front and to the bottom of the radiator.
Am considering connecting the new oil cooler in line with the current setup.
Any experience on this ?? And out of the two oil tubes coming from the gearbox and either side of the engine sump, which is the the inlet and which the outlet.
Thanks !!
Hmmm,
Pambos,
Cyprus is obvisousley a lot hotter than dear old NI, but I would have thought Mercedes allowed for all European temps during design
cant answer which pipe is which, but as above I wonder if cooling is the problem as my 290 van running at 120 factory HP appears to have the same cooling arrangment, this assuming that the fluid can or is still circulating as intended by Mercedes.
But then your symptons are definately temperature related so Doh! to above
The auto transmission guy who rebuilt my transmission was going to fit an additional radiator for the trans fluid, seems he regards/fits this as a standard arrangment for any vehicle that is being used as a taxi.
I somewhat sniffly said if it was good enough for Mr Mercedes it was good enough for me ie just check out and stick with the origional set up thank you!
I should add that I had recently had the vehicle radiator recored as it was rotten and leaking.
PS
I did think it odd that Mercedes do not fit any warning lights or temperature indicator for the auto trans.
Is it any odds/much odds which way round you plumb in your additional radiator?
Cheers Marcus
Yep,
The 290 has a 18"/450mm 9 blade
I was thinking re your flow and return, why not warm her up and either feel which pipe is warmest or take an actual temperature reading.
Cheers
Marcus
Good thinking !! Thanks
Regarding the direction of flow of transmission oil through the cooler, this is clockwise.
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Marcus, thanks for the reply ...
As I said I'm effectively restoring my G, which gives me the opportunity to look into issues I never had the time to deal with before.
So, I've replaced the radiator as it was in a very sorry state, replaced the oil cooler with a more efficient design and now I'm thinking of adding the transmission oil cooler.
Ah, I'm also replacing the visco fan with a 17" electric one. And on this point, looking at EPC I found that after a certain chassis number, the fan becomes larger with more blades.
I've thought was you said, that with the new radiator there won't be a problem with transmission cooling, but at the same time, the standard kind of arrangement is the same as with the passenger cars of the same era. Difference is they are much lighter, and don't drive at engine speeds and loads the G does.
Thanks, Alexis