Torque converter

Submitted: Friday, Jan 07, 2005 at 18:59
ThreadID: 19155 Views:1473 Replies:4 FollowUps:4
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Does anyone know how to replace the fluid in the torque converter on a Nissan 3L TD Auto? Apparantly it should take about 8L, I couldn't find any reference to this in Gregory's Worksop Manual.
Many Thanks
Mike
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Reply By: Richard Kovac - Friday, Jan 07, 2005 at 19:13

Friday, Jan 07, 2005 at 19:13
Michael
the torque converter is part of the auto trans
the oil in the converter will drain back into the trans at least haft way when the engine is turned off. when the trans pump flow dead heads at the relief valve the oil then travels into the converter filling it allowing it to work coming out then through the cooler back to the trans sump
on some converter there is a 1/8" gas plug so you can drain the through a hole in the bell housing.

regards Richard
AnswerID: 91833

Follow Up By: Member - Michael- Friday, Jan 07, 2005 at 23:47

Friday, Jan 07, 2005 at 23:47
Thanks Richard, Casnat in the following message has confirmed my worst fears.
Many Thanks
Mike
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Reply By: Casnat - Friday, Jan 07, 2005 at 21:18

Friday, Jan 07, 2005 at 21:18
Hi Mike,

This is quite a job. You will find 2 cooler lines going to the radiator (to cool the trans oil). You need to determine which is the return line into the back of the transmission. Disconnect the return line at the trans and blank off the open entry into the trans (don't forget to do this). You need to connect some extra hose or something onto the return line and put it into a bucket to take the dirty oil (as explained below will need to be quite large to take a reasonable volume of oil).

If you have put 4Lt into the pan of a total of 12Lt you will need to have significantly more oil than 12Lt on hand (probably 15 - 16 Lt). You only get 1 chance because if you stop the flushing exercise explained below the new and old oil will mix and you will be stuffed so you need to have more rather than less (you can keep surplus for future use).

Start the engine and the oil from the converter will be flushed out of the return hose into your bucket. At the same time you need to be replacing new oil into the dipstick tube (probably a 2 person job). You must keep doing this until the oil running into the bucket runs clean new oil. As stated above, due to mixing, this will take more than the volume in the converter.

Once running clean, turn off the engine, reconnect the return line to the Trans, start the engine again and top up the oil level to full point.

As stated, once you start this you must keep going until finished or new oil will be mixed with old. Make sure you have plenty of oil and a big enough bucket.

The only other way is to remove the converter and cut it open (they are a sealed unit).

Good luck

Trevor
AnswerID: 91847

Follow Up By: Casnat - Friday, Jan 07, 2005 at 21:40

Friday, Jan 07, 2005 at 21:40
Unless it wasn't clear in the above, before you start the engine to begin flushing you should fill the sump with the 4 lts or so it will take.

Trev
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Follow Up By: Member - Michael- Friday, Jan 07, 2005 at 23:45

Friday, Jan 07, 2005 at 23:45
Casnat
You have just clarified my worst fears, I had a sneaking suspision that this was going to be the only way and explains the high cost that Nissan charge.It looks like I will be going to Nissan to change the fluid as the surplus left over if i did it myself would probably never get used as in 17500k I have never had to top up.
Many thanks for the info
Mike
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Reply By: Casnat - Friday, Jan 07, 2005 at 23:54

Friday, Jan 07, 2005 at 23:54
hi Mike,

It's not actually as scary as it sounds and a bit of surplus fluid may be cheaper than their labour charge. What I have outlined is exactly what they will do... they just have plenty of oil on hand to use.

You may want to consider a transmission specialist rather than Nissan from a cost point of view, this is after all the background from where my advice comes.

Good to give something back to the forum for a change....I hope I helped

Trev
AnswerID: 91875

Follow Up By: Member - Michael- Saturday, Jan 08, 2005 at 09:28

Saturday, Jan 08, 2005 at 09:28
Hi Trev
I know a chap who's a fellow member of the 4WD Assoc. here in WA who's runs his own 4WD Service Centre, unfortunately he is on holidays at the moment. I will be seeing him on his return.
Once again thanks for info
Mike
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Reply By: itisi - Sunday, Jan 09, 2005 at 02:18

Sunday, Jan 09, 2005 at 02:18
Mike
The procedure described above is correct and NOT as difficult as it sounds.
Had to do my Surf auto a couple of months ago.
As for the surplus? Why not give the power steering a birthday too. Similar type of procedure and a lot easier with two people (both jobs).

Trans oil should be changed every 40 thouand or perhaps even sooner if you do any towing.

Cheers
Rod
AnswerID: 91994

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