NAG1 Transmission Fluid Change

Bill B.

Member
Thanks Bill! I will go ahead and order one. I am confused as to the volume of ATF 134 needed with Torq Converter drained. Some videos say 5 QTs, others say 8 QTs. And for some reason I can't find the Shell ATF 134 in Canada? Could you help me with sourcing the right amount of an approved fluid? Much obliged, Harold
I found a sale for 6 quarts On Amazon for $10/qt, ordered three more quarts and used a full 8 quarts as I recall. That is.... I have an unopened bottle and don’t recall any spills. After a complete drain including the TC, new filter, and refill I was spot on. BUT don’t rely on that. I’d fill with at least a quart less than full spec capacity, measure, then fill as needed. Be sure to follow all the steps carefully. I also recommend that you measure the amount of fluid removed and don’t refill with more than that to start with unless it’s grossly under filled.
 

Little Harold

New member
I found a sale for 6 quarts On Amazon for $10/qt, ordered three more quarts and used a full 8 quarts as I recall. That is.... I have an unopened bottle and don’t recall any spills. After a complete drain including the TC, new filter, and refill I was spot on. BUT don’t rely on that. I’d fill with at least a quart less than full spec capacity, measure, then fill as needed. Be sure to follow all the steps carefully. I also recommend that you measure the amount of fluid removed and don’t refill with more than that to start with unless it’s grossly under filled.
Excellent - THANK YOU
 

Aqua Puttana

Poly - Thread Finder
I found a sale for 6 quarts On Amazon for $10/qt, ordered three more quarts and used a full 8 quarts as I recall. That is.... I have an unopened bottle and don’t recall any spills. After a complete drain including the TC, new filter, and refill I was spot on. BUT don’t rely on that. I’d fill with at least a quart less than full spec capacity, measure, then fill as needed. Be sure to follow all the steps carefully. I also recommend that you measure the amount of fluid removed and don’t refill with more than that to start with unless it’s grossly under filled.
Good advice.

My experience has been that I didn't need the full 8 quarts. 8 quarts is what should be on hand for the change, but don't just dump the full 8 quarts in (as is outlined above).

:2cents: vic
 

Little Harold

New member
So I went to remove drain plug (NAG1) and T27 Is too small, even T30 is loose. Looks like last person didn’t have right tool and stripped it...?
Anyone have any trickS to remove it?
Thanks!
 

sikwan

06 T1N Can
So I went to remove drain plug (NAG1) and T27 Is too small, even T30 is loose. Looks like last person didn’t have right tool and stripped it...?
Anyone have any trickS to remove it?
Thanks!
Maybe a larger than T30 torx bit, a wide enough flat blade screwdriver, or an allen wrench.

If those are not possible, I would just drop the pan. A little messy yes, but maybe you can access the bolt from the inside and take it off using a pair of vice-grips. Replace the drain bolt afterwards.
 

Little Harold

New member
ThAnk you!
Will drop the pan to drain, maybe out a kiddy pool down to catch everything haha. The parts manual has the incorrect P/N for the plug, ends up being the magnet. Dealer can’t seem to find a number and doesn’t think they can order one. Saw some other threads to that effect also. Weird
 

Cheyenne

UK 2004 T1N 313CDi
ThAnk you!
Will drop the pan to drain, maybe out a kiddy pool down to catch everything haha. The parts manual has the incorrect P/N for the plug, ends up being the magnet. Dealer can’t seem to find a number and doesn’t think they can order one. Saw some other threads to that effect also. Weird
Have a look in the 2005 Parts manual for the number... http://diysprinter.co.uk/reference/05va-parts manual.pdf

Keith.

EDIT: Cancel that! There appears to be an error with all years of parts manuals as they show item 14 which should be the drain plug as a 'MAGNET'.

EDIT 2: Here is a correct parts view with items 14 and 15 correctly depicted https://www.moparpartsgiant.com/parts/mopar-magnet~52108331aa.html

EDIT 3: And here is the plug https://www.moparpartsgiant.com/parts/mopar-plug~5143740aa.html
 
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Aqua Puttana

Poly - Thread Finder
Maybe a larger than T30 torx bit, a wide enough flat blade screwdriver, or an allen wrench.

If those are not possible, I would just drop the pan. A little messy yes, but maybe you can access the bolt from the inside and take it off using a pair of vice-grips. Replace the drain bolt afterwards.
:idunno:

I thought the transmission drain plug on the NAG1 was 5 mm Allen? I don't recall using a Torx.

vic
 

Little Harold

New member
Hello Vic,
The NAG1 spec says T27 Torx and several NAG-1 service videos online show the Torx being used on the plug (and pan screws) however I found that many people just use a 5mm Allen like you said. I am welding a standard metric nut onto my plug to avoid further issues :)
 

Aqua Puttana

Poly - Thread Finder
Hello Vic,
The NAG1 spec says T27 Torx and several NAG-1 service videos online show the Torx being used on the plug
...
:idunno:

Didn't you say earlier that Torx didn't work? Maybe MB NAG1 transmissions are different.

So I went to remove drain plug (NAG1) and T27 Is too small, even T30 is loose. Looks like last person didn’t have right tool and stripped it...?
Anyone have any trickS to remove it?
Thanks!
My trick?

Use the 5mm Allen that works for others.

:cheers: vic
 

Little Harold

New member
:idunno:

Didn't you say earlier that Torx didn't work? Maybe MB NAG1 transmissions are different.


My trick?

Use the 5mm Allen that works for others.

:cheers: vic
Hey Vic,
You’re absolutely right, the Torx do not work. I tried the 5mm Allen but it turns in the hole. The last service was done at dealer (when I had more $) six years ago. They never said anything about the stripped plug, I’m guessing they dropped the pan and never removed the plug. At least I hope they changed the fluid... I had just bought the van and asked them to do a full service and replace anything that needed replacement for a long trip. Total bill was $5000.00. I will try again to find a replacement drain plug that fits the NAG1.
 

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Cheyenne

UK 2004 T1N 313CDi

Aqua Puttana

Poly - Thread Finder
Hey Vic,
You’re absolutely right, the Torx do not work. I tried the 5mm Allen but it turns in the hole.
...
As you said earlier, someone was there first to help you. :bash:

As I mentioned earlier in this thread-the drain plug is removed (or attempted to be removed) with an Allen bit- not a torx bit. 5mm to be exact.

I have never stripped a drain plug's internal socket head but I have deformed a very high strength Snap-on Allen bit in the attempt. Doktor A
I stand corrected, after receiving the new plug from Mercedes I can clearly see that Doctor A is correct. :bow: The drain plug is indeed a 5mm Allen type. Mercedes # A0009976532 Screw Plug
Chrysler # 05143740AA PLUG
 

Little Harold

New member
See the third edit to my post above... (but please double check I have the correct number).
Yes I did see your link thanks, after digging I found the Mercedes P/N in a post from 2009! For reference it is MB#A0009976532 Screw Plug which they can still get :) Will have it tomorrow. I’ll repost if ends up not being the right plug.
 

Little Harold

New member
Hi all! Picked up the new drain plug at Mercedes with replacement washer.
Easily got the TC drained thanks to all the help here :) Question... anyone know the torque spec for TC drain plug(5mm) ? Thanks!!!!
 

Cheyenne

UK 2004 T1N 313CDi

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