1996 850 Fast Trans Fluid Leak After Seal Change

[PeteB]

Well, we are back to the slow trans fluid leak.
Cooler hose seals?

[tryingbe]

Well, we are back to the slow trans fluid leak.
Cooler hose seals?

Where is the fluid? Start backward from there. The leak is on the car, no one else on the internet will be able to spot it for you.

[mecheng]

Well, we are back to the slow trans fluid leak.
Cooler hose seals?

Most likely spot, check the O rings, I replaced mine, they were getting old and leaked slightly. Volvo OEM only

[PeteB]

Thanks, will get the o-rings first, going to change them since it probably needs it.

[erikv11]

If you change the o-rings, change the rubber seal at the base of the hose nozzle, too. But if there is a leak there, you can see it. So of course change it if it is leaking, but if it isn't then don't expect it to solve the slow leak problem.

See tryingbe's post. If the trans fluid is disappearing and you don't know where from, just keep looking.

[PeteB]

Right, but if I'm going to crawl under there, and it is not hard I'll just change
them to not have to do it next.
I don't know what the rubber seal part is, but I'll try to find a parts diagram
and figure it out.
Thanks for all the tips.

[PeteB]

This thread shows how to DIY Volvo hose replacement and gives o-ring part numbers, then
toward the bottom cn90 tells how to DIY the expensive hoses - very nice:
viewtopic.php?t=54118

If I have to do the hoses, I'm also going to do the o-rings so I might as well do them first.
I'm going to DIY the hoses since we don't want to put another $150 into the car.

Tips from cn90 in that thread:

I just want to add a few quick notes for those who want to replace only the O-rings:

- O-rings 6842413 (radiator side) and 968757 (trans side)...$3/each should be replaced.
- The "Sealing Ring" 6842414...$4/each is basically a "shock absorber" to prevent damage to the radiator as the hose sways back and forth when the engine runs. The sealing is accomplished by the O-ring mentioned above and not by this "Sealing Ring".
In most cases, the "Sealing Ring" can be re-used. Of course, it is your choice to re-use the "Sealing Ring" or not.
If you want to save $8, then re-use the "Sealing Ring".

- The Clip has a WIDE side (radiator side) and NARROW side.
It is very easy to make this mistake, and if you make this mistake, the hose will not "click" into the clip ---> hose comes out later causing massive ATF fluid loss. This happened to me a few years ago when my mechanic changed the Rear Main Seal, during install he reversed the clip w/o knowing it. I lost tons of ATF on the highway, scary experience!

- So the bottom line is:
* Install the clip with proper orientation.
* Wrap a screw-type clamp around the clip to secure it.

PS: Those who want to flush the ATF, search for the DIY by "MadeinJapan".

[erikv11]

I may sound like a broken record (record, what's a record?) but same question - why repair the hoses if they aren't leaking? If they ever do start leaking, you will have plenty of time to gear up for the work.

[PeteB]

What is left to solve this problem?
I'm going to do the o-rings,
while in there I'll look over the hoses carefully.
If the o-rings don't fix it and the hoses look bad then I'll do the hoses.
I'm not looking for extra work, I expect that the o-rings will be easy
but I could be wrong of course.
Was passing by the dealer this morning and got the o-rings for less than $4 each.

[erikv11]

What is left to solve this problem? ...

The first step is to identify the location(s) with leaks. See tryingbe's post.

The o-rings are easy for sure. Remember, when you pull the lower hose the fluid in the trans cooler (side chamber of the radiator) will pour out.