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posted on January 30th, 2012 at 11:02 PM
which is better, thicker or thinner atf.
I have an old transmission 090 in a 89 t25. on starting cold, it goes nowhere and seems to wait a bit to let the pressure build up. after a few
minutes is is ok but siwtching gears takes a bit longer. If it has gone cold after a drive (say 4-8hours) same problem. whines a bit in park and
reverse when cold. i am contemplating a rebuild or a second hand one, but funds not there yet.
i have tried changing the fluid and it is better in the short term. when i add an atf fluid additive is seems better but that too soon stops.
my question is which is better for an old transmission. thick or thin atf?
Mark Wilson
78 bay window, 82 bay Westy. T3 Caravelle GL 89 on the road.
Now in Victoria.
bajachris88
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posted on January 31st, 2012 at 06:00 PM
thicker stuff usually raises temperatures, but its greater viscosity allows it to fill the 'voids' or clearances that are now greater because of the
wear and tear, thus being like a liquid gap filler .
The principal works for motors, i can only assume it would be the same for an old auto transmission. Best to wait for a expert opinion though.
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posted on January 31st, 2012 at 09:15 PM
Quote:
Originally
posted by mjwcookie
I have an old transmission 090 in a 89 t25. on starting cold, it goes nowhere and seems to wait a bit to let the pressure build up. after a few
minutes is is ok but siwtching gears takes a bit longer. If it has gone cold after a drive (say 4-8hours) same problem. whines a bit in park and
reverse when cold. i am contemplating a rebuild or a second hand one, but funds not there yet.
i have tried changing the fluid and it is better in the short term. when i add an atf fluid additive is seems better but that too soon stops.
my question is which is better for an old transmission. thick or thin atf?
I believe thicker ATF if You can find it?
for it to be pumped in a worn system.
same as engine oil..
in a worn engine...
Lee
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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posted on February 1st, 2012 at 06:03 AM
The transmission needs to be rebuilt. The seals in the clutch packs have gone hard. So what is happening is the oil is going past the seals and not
appling the clutch. Once the transmission warms up abit the seals become soft and
start to do there job again. You can not buy thicker ATF oil. The difference in oils are the additives that the car manufactures use. Most of the time
changing the oil makes the problem worse.
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posted on February 3rd, 2012 at 12:58 PM
There are differences in actual oil viscosities between various types and brands of ATF's. But you need to be using the correct type specified for
the transmission.
When you change the oil, you need to check that the screen/filter is clear, and clean out the pan. (You may be able to get 'oil flush' I think to
clean the system before draining it, but I don't know the brand.)
ACE 30 & 40 oils: specifically engineered for your Air Cooled VW
delivered (free del.) throughout Yarra Valley / Ranges, & Gippsland areas. Also ACE 20, 50 & 90.
FOR SALE: ACE 30, 40 etc. Oil formulations & Trade-names.
.
