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Home > Maintenance & Modifications > Rear Diff drain plug DIY
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Stuartc



Member Since: 01 Dec 2014
Location: Perth, Australia
Posts: 2292

Australia 2015 Freelander 2 SD4 HSE Auto Aintree Green

Great Idea Thumbs Up
Will definitely add this to the “to do” list as I think I still have a bit of time on my side atm Very Happy
Nice to see someone having a go! MY15
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Post #376319 6th Aug 2019 11:51 am
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jules



Member Since: 13 Dec 2007
Location: The Wilds of Warwickshire
Posts: 4517

United Kingdom 2014 Freelander 2 SD4 SE Auto Firenze Red

Richard Willetts wrote:
Hi Jules

Nice job excellent idea, how hard and how much time did it take to drill obviously using a good quality drill bit.
I was thinking about sucking it out with a pump as to not get any muck inside the diff casing.

Richard


Its easy to drill and tap as its only aluminium. I drilled through in small steps with the bit heavily coated in cutting paste to try and trap swarf from entering the diff case.

You can use a Pela pump to suck out the oil - getting the flexi tip into the lowest area within the diff case can be awkward though and takes a while to suck it out as the oil is more viscous than engine oil . however you not going to damage anything. Jules

Post #376365 6th Aug 2019 9:12 pm
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Dave47



Member Since: 31 Aug 2014
Location: Margate Kent
Posts: 1277

United Kingdom 2008 Freelander 2 TD4 SE Auto Izmir Blue

Thanks Jules,
My friendly spanner man did this for me last week. Thumbs Up
old oil was clean!
but we'll have another change soon and see what's on the magnet. Cheers
Dave DAVE.
I.A.M. F1rst Driver.
Gone 2003 Discovery TD5 Auto,
Gone 1986 Defender 90 Station Wagon
Gone 1984 Range Rover 3.5 Vogue Manual.
Gone 1970 Series 11A/3 SWB 3.5 V8 Hybrid
Gone 1964 Series 11A LWB Van
Gone 1966 Series 11A SWB Van
Gone 1964 Series 11A LWB Station Wagon,

Post #376376 7th Aug 2019 6:50 am
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Arctic



Member Since: 24 Aug 2016
Location: Westmidlands
Posts: 424

United Kingdom 2014 Freelander 2 SD4 HSE Auto Orkney Grey

My diff oil is due a change, well to be honest all the oils need changing, I will most certainly be doing this mod before hand thank you for sharing.

Post #376508 9th Aug 2019 9:51 am
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merlinj79



Member Since: 13 Aug 2019
Location: San Diego
Posts: 313

United States 2008 LR2 i6 S Auto Tambora Flame

Did this mod today, went fine. The drill grabbed and bottomed out as it broke through, I was afraid I'd hit something internal but it looked like it just hit the side of the case where it necks down.

Tapped carefully, then flushed it out with a L of fluid before filling with another L.

I used a Goldplug MP-02 magnetic plug for the new drain.

I switched to AMSOIL Severe Gear synthetic oil, not really comfortable with OEM dino juice given the problems with that diff. Will change every 40K.

About 600 ml drained out, and then I used a hand pump to see how much more I could get which was another 100 ml. So basically got most of it through the drain hole. The old fluid was pretty dark but not pitch black (30k on a new Diff with OEM oil). It wasn't very hard to pump it out (unlike some cases) so it might be better to just do that rather than drill and tap.

I tried to install a Goldplug AP-05 for the fill hole, so I could check for metal periodically without draining the diff but the head on AP-05 was too wide. Might be able to make it work with several washers but the washer that came with it was too wide as well. Caveat, Goldplug did not advertise AP-05 for this application, I was experimenting. I'll try to come up with something magnetic for the fill hole. Could not find the AP-05S.


Last edited by merlinj79 on 10th Sep 2019 1:39 pm. Edited 1 time in total

Post #378091 10th Sep 2019 2:05 am
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MotionInc



Member Since: 17 Jun 2019
Location: North America
Posts: 1278

Canada 2008 LR2 i6 SE Auto Tambora Flame

I am a big fan of Amsoil and I use the Severe Gear 75W110 in the diffs.

EDIT: followed a link and made this post in the linked thread instead, Laughing

Post #378122 10th Sep 2019 12:23 pm
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p_gill



Member Since: 06 Dec 2011
Location: USA
Posts: 1218

United States 2008 Freelander 2 i6 SE Auto Tambora Flame

merlinj79 wrote:

I switched to AMSOIL Severe Gear synthetic oil, not really comfortable with OEM dino juice given the problems with that diff. Will change every 40K.

About 600 ml drained out, and then I used a hand pump to see how much more I could get which was another 100 ml. So basically got most of it through the drain hole. The old fluid was pretty dark but not pitch black (30k on a new Diff with OEM oil). It wasn't very hard to pump it out (unlike some cases) so it might be better to just do that rather than drill and tap.


Merlin,

nice mod well done!!! Thumbs Up

Thanks for sharing.

Is the 600ml from the drain with the LR2 level or did you lift it from the fill plug side to maximize what drained out?

Severe Gear is an interesting choice, I thought about going that route but I settled for Mobil 1 Delvac and I am happy with my choice.

I was driving my Tambora Flame LR2 in Temecula about a week ago but I didn't see another LR2 (Tambora Flame) perhaps I didn't go far enough south.

Take care

Paul

Post #378132 10th Sep 2019 4:26 pm
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p_gill



Member Since: 06 Dec 2011
Location: USA
Posts: 1218

United States 2008 Freelander 2 i6 SE Auto Tambora Flame

merlinj79 wrote:

I tried to install a Goldplug AP-05 for the fill hole, so I could check for metal periodically without draining the diff but the head on AP-05 was too wide. Might be able to make it work with several washers but the washer that came with it was too wide as well. Caveat, Goldplug did not advertise AP-05 for this application, I was experimenting. I'll try to come up with something magnetic for the fill hole. Could not find the AP-05S.


Merlin,

To make the AP-05 fit you will likely just have to switch to a smaller washer (as you pointed out).

I can measure the size of the washer that I am using if you are interested.

For my Son's VW the drain bolt on the engine oil pan tends to leak because the washer isn't easily centered.
I fixed this by using a Dowty washer and then an aluminum washer.
I suspect that this would work for you as well.

Take care

Paul

Post #378133 10th Sep 2019 4:33 pm
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merlinj79



Member Since: 13 Aug 2019
Location: San Diego
Posts: 313

United States 2008 LR2 i6 S Auto Tambora Flame

p_gill wrote:
merlinj79 wrote:

I switched to AMSOIL Severe Gear synthetic oil, not really comfortable with OEM dino juice given the problems with that diff. Will change every 40K.

About 600 ml drained out, and then I used a hand pump to see how much more I could get which was another 100 ml. So basically got most of it through the drain hole. The old fluid was pretty dark but not pitch black (30k on a new Diff with OEM oil). It wasn't very hard to pump it out (unlike some cases) so it might be better to just do that rather than drill and tap.


Merlin,

nice mod well done!!! Thumbs Up

Thanks for sharing.

Is the 600ml from the drain with the LR2 level or did you lift it from the fill plug side to maximize what drained out?

Severe Gear is an interesting choice, I thought about going that route but I settled for Mobil 1 Delvac and I am happy with my choice.

I was driving my Tambora Flame LR2 in Temecula about a week ago but I didn't see another LR2 (Tambora Flame) perhaps I didn't go far enough south.

Take care

Paul


600ml was level, since it was jacked up on four corners. Next time I'll try tilting it.

We're near downtown SD, wife drives the car mostly around here.

Post #379134 1st Oct 2019 6:56 pm
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petero



Member Since: 27 Jul 2017
Location: Tamworth, Staffs
Posts: 49

United Kingdom 2007 Freelander 2 TD4 HSE Manual Sumatra Black

I have just replaced the outer pinion bearing in a spare rear diff using MRRover's excellent write up and took the opportunity to follow Jules' example and fit a drain plug while I had it all apart. The raised boss on my diff was elongated compared to Jules' diff so I was able to drill further in and avoid the raised bit.



I used a Goldplug MP-01 M12x1.25 and filed the raised boss flat to suit the plug (same as Jules)



It protrudes a bit further than I expected but doesn't foul anything so I will leave as is for now. I believe there is a shorter version of this plug which I may consider fitting later.



Now I just have to swap it with my noisy diff and see how it runs Smile

Post #387917 9th Mar 2020 9:12 pm
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Bobupndown



Member Since: 26 Dec 2014
Location: Upside down behind the TV!
Posts: 2622

United Kingdom 2014 Freelander 2 SD4 GS Auto Orkney Grey

This is a great mod that I'm planning to do as well, having changed the Haldex oil last weekend, Im going to do the autobox next then the diff and PTU and have all the oils changed well in advance of the 10 year recommendation.
Slightly concerned that a wrong move could be costly, broken tap etc would be a disaster but I guess a quality tap going into alloy casing shouldnt be too difficult? Landrover - turning owners into mechanics since 1948

2014 Orkney grey Freelander SD4 GS.
2004 Zambezi silver Discovery 2 Td5 (Gone)
1963 Surf blue Morris Mini Minor Super de Luxe (my little toy)

Post #390454 25th Apr 2020 10:28 am
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petero



Member Since: 27 Jul 2017
Location: Tamworth, Staffs
Posts: 49

United Kingdom 2007 Freelander 2 TD4 HSE Manual Sumatra Black

I found the most difficult thing was drilling perpendicular to the flattened boss (I failed!) and then filing the boss to suit the head of the plug. The alloy casing taps fine as long as you take your time and regularly back the tap off to keep things clean. Whether you use M12 as I did or M14 like Jules (I think he used the blanked off hole which you may need to do as well as yours is MY14) you shouldn't manage to break it. Make sure that you get the correct pitch thread for the plug that you choose - they tend to be a finer pitch than standard metric threads of those diameters.
Best of luck Thumbs Up

Post #390476 25th Apr 2020 10:00 pm
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I Like Chips



Member Since: 25 Jun 2017
Location: Ascott Under Wychwood
Posts: 1418

United Kingdom 2011 Freelander 2 SD4 HSE Auto Indus Silver

Just wondering...........Has anyone drilled and tapped the bolt hole.?

Post #390483 26th Apr 2020 9:36 am
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Bobupndown



Member Since: 26 Dec 2014
Location: Upside down behind the TV!
Posts: 2622

United Kingdom 2014 Freelander 2 SD4 GS Auto Orkney Grey

Quote:
Just wondering...........Has anyone drilled and tapped the bolt hole.?


Not sure what you mean? Is that not what Jules did in his original post? Landrover - turning owners into mechanics since 1948

2014 Orkney grey Freelander SD4 GS.
2004 Zambezi silver Discovery 2 Td5 (Gone)
1963 Surf blue Morris Mini Minor Super de Luxe (my little toy)

Post #390485 26th Apr 2020 9:53 am
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I Like Chips



Member Since: 25 Jun 2017
Location: Ascott Under Wychwood
Posts: 1418

United Kingdom 2011 Freelander 2 SD4 HSE Auto Indus Silver

No.I am looking at the post on this thread by Alex Pescaru of 18/10/18. Drilling through an existing bolt hole.

Post #390493 26th Apr 2020 3:13 pm
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