Changing diff oil

[1peter]

Can anyone tell how to change the diff oil in my GU and what weight oil to use ? I will be using Penrite. Any help appreciated.

[scotty83]

Will need to know which one. Front and Back use different oils due to the Limited Slip Rear Diff.

There is my list of oil weights and amounts: Mine is a 3L 2005. some things may vary slightly depending on which model you have.

Oil - Penrite HPR 15w-50
Front Diff (5.4L)- 90w hypoid
Rear Diff (2.1-3L)- Penrite Limslip Hypoid 85w140
Gear Box (3.9L)- 75w85 Gear Oil
Transfer Case (2.2L)- 80w90 Gear Oil
Power Steering (1L)- Dexron II
Glow Plugs x4 - GPN-900


Welcome others for any other info you may have here.

ScottyB

[scotty83]

Forgot the best bit of advice i have ever been given. remove the filler plug first. Just in case you can't get it out. oil doesn't flow uphill.

there are some pictures around the forum from people who use Funnels and garden hoses to get the oil back in.(sorry couldn't find them) i am trying a big sauce squeeze bottle next time.

[growler2058]

Forgot the best bit of advice i have ever been given. remove the filler plug first. Just in case you can't get it out. oil doesn't flow uphill.

there are some pictures around the forum from people who use Funnels and garden hoses to get the oil back in.(sorry couldn't find them) i am trying a big sauce squeeze bottle next time.

Dont bother with the sauce bottle mate itll send ya over the edge. For about $20 you can pick up an oil pump like a big syringe from somewhere loke sprint auto parts or the like

[Bigrig]

Will need to know which one. Front and Back use different oils due to the Limited Slip Rear Diff.

There is my list of oil weights and amounts: Mine is a 3L 2005. some things may vary slightly depending on which model you have.

Oil - Penrite HPR 15w-50
Front Diff (5.4L)- 90w hypoid
Rear Diff (2.1-3L)- Penrite Limslip Hypoid 85w140
Gear Box (3.9L)- 75w85 Gear Oil
Transfer Case (2.2L)- 80w90 Gear Oil
Power Steering (1L)- Dexron II
Glow Plugs x4 - GPN-900


Welcome others for any other info you may have here.

ScottyB

Top response mate - well done!!!

[1peter]

Brilliant, I"ll be on it today after work. Ah work, don't ya love it. Thanks a bunch guys, I'll get this truck sorted out yet.

[MudRunnerTD]

hey mate if you can, before you are about to fill try and heat up your new oil a little, put the whole bottle into a big pot of water and heat er up on the BBQ if you have too. the oil si as thick as crap. if you have not got something to deliver the oil through (as per Plassies post or a McNaught Pump) then you will be there a Loooooong time and yor arms will be wrecked.

http://www.macnaught.com.au/persistent/catalogue_images/products/suctionGun.jpg


That is what i use and would be lost without it. I have done it once without this pump and NEVER AGAIN!!



****P.S. Nice Bike ;)

[Silver]

some people adapt a pump up garden sprayer - I have used the mate's 20l drum pump, and a littler version for the 5l bottles.

The manual calls for thread sealant. My advice is to be a bit thoughtful about how tight you do the bungs up. Neither I nor my mechanic could undo some of the plugs on my old MQ - the next step was applying lots of heat, but as it turned out we moved onto the GQ while pondering the next move. Maybe if I drove the Q a bit more and thus had more regular oil changes in the transmission and diffs they wouldn't have grown in, or whatever they did :-)

Tight enough not to leak or fall out, but not tighter :-)

[1peter]

Well the rear diff is done, that stuff is pretty thick, even with the pump. I didn't use thread sealant so we will see ? Glad i didn't have to push it throught the hose attached to the Penrite bottle, i would still be there. The vibration i had when taking off in the truck is just about gone. Thanks all.

[Boagie]

i would put redline oil in it if ya can afford it--it is the best by far

[1peter]

Hi Boagie, yep Redline is good oil but "maybe" not as good as they claim, i have gone down the path of which oils to use in both of my bikes and i put Redline (at $40 a litre) in the box of my Harley (lucky it only takes a Litre). Anyway, it didn't change any better and was no quieter than any other oil i have tried even though everyone was claiming that it would be ? I have read all the Redline tests etc and I am not knocking Redline but i think there are oils out there that do the job just as well without the added expense, as long as you change the oil/filter regularly. I use Mobil 1 V-twin full syn in the Harley, Shell full syn in the Triumph and will be using all Penrite oils in the Patrol. Just for interest sake, one oil that did make a noticable difference in the box of the Harley was Amsoil but it's not easy to get so i didn't bother continuing to use it. I usually try an oil then listen to the engine/box and see how things sound/opperate etc., mind you it's a lot easier to hear what a bike engine is doing than a Patrol engine lol. At the end of the day i think most oils out there are pretty good these days as long as you are buying a reputable brand. My old Ford EL has over 300,000km's on it and barley uses any oil and i have always run Valvoline in it at $30 for 4 or 5 litres depending whether it is on special. I have always changed the oil and filter every 10,000km's and never had a problem, been around Australia towing a van in the old girl and even though we just bought the Patrol i can't part with her.

[Boagie]

yeah mate--i just put redline in the box,and the rear diff and transfer----it sounds very quiet-----but i use penrite in the engine.i have a ktm in which i run fuchs ---made quite a difference----it changes more easily now--when i am beating up on it!!!!lol

[joeker]

I found this thread after I tried to undo the filler plug (yeah, I have heard of people being caught with a drain plug that undid and a filler that didn't) and it won't budge.

Before I go all Tarzan on it I thought I should check to see if there is a knack or if it is a left hand thread or something.

Or do I just add muscle until it moves?

[Robo]

I found this thread after I tried to undo the filler plug (yeah, I have heard of people being caught with a drain plug that undid and a filler that didn't) and it won't budge.

Before I go all Tarzan on it I thought I should check to see if there is a knack or if it is a left hand thread or something.

Or do I just add muscle until it moves?

Normal direction for undoing.
a slide bar with and extension making handle 2x should do the job.
sealent and less torque next time doing up.
cheers

[growler2058]

I found this thread after I tried to undo the filler plug (yeah, I have heard of people being caught with a drain plug that undid and a filler that didn't) and it won't budge.

Before I go all Tarzan on it I thought I should check to see if there is a knack or if it is a left hand thread or something.

Or do I just add muscle until it moves?

Go Tarzan man. I use an electric wheel nut gun. Similar to a rattle gun. The square 1/2" drive does the job


Sent via my tapping thumbs

[joeker]

Go Tarzan man. I use an electric wheel nut gun. Similar to a rattle gun. The square 1/2" drive does the job


Sent via my tapping thumbs
Excellent advice there - I have one of those units and will dig it out and get rattling!

Thanks guys

Joe