Diff oil change

[Rydogz]

Hit a snag changing the oil, (1)how big is the washer on the drain plug(assuming what ever crude was left wasn't anti seize). (2) How big is the filler plug, my bigger ring spanner is 7/8 and no deal.
vy ss II (LSD)

Any info appreciated, cheers.

[Toddler78]

Dude I think it is 17mm from memory


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[Rydogz]

Biggest thing I could find was 15/16 and it was still too small lol. Probably should of checked just didn't expect it to be so big :doh: Took forever to get the fuel filter off and was running out of sunlight.

Must be 1 inch?

Called it quits for the day, beer time :beer:

[striker8881]

24mm from memory mate

[V8_Power]

Standard diff cover or harrap sport or harrop enduro cover?

[Rydogz]

I just had another look with the torch and a steel rule and it would not surprise me if it was 29mm. Its the stock standard cover, did some models have harrop ones? Has a tag under the fill plug but it just says "lsd" use correct lubricant etc.

[V8_Power]

29mm seems a tad on the large size. Nope, just checking you didn't have an after market diff cover.

[Rydogz]

Just found a VZ how to on justcommodores.com, which says its 30mm.

http://forums.justcommodores.com.au/holden-commodore-how-tos/76101-how-changing-differential-oil-vz.html



Are the diff's the same?

[Mohit]

Definitely a 30mm plug. I remember buying a 30mm socket from Repco to change the LSD oil in my old VYII SS.

Nulon 85W-140 diff oil and G70 additive worked best in my SS and also just recently put it in my current VYII Calais LSD.

[Toddler78]

hang on are you asking about the drain plug or the fill plug, because so far you are switching between the two in you description

Like I said from memory the drain plug is 17mm (or 15mm) it will be one or the other.

The Fill plug is 30mm

[Mohit]

Yep the fill plug is 30mm as above

[macca_779]

Yeah it's big. I need my large 1/2" socket set for that sucker


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[Rydogz]

Definitely a 30mm plug. I remember buying a 30mm socket from Repco to change the LSD oil in my old VYII SS.

Nulon 85W-140 diff oil and G70 additive worked best in my SS and also just recently put it in my current VYII Calais LSD.

Cheers mate. They are probably 1/2" drive though aren't they, being 30mm. I have a 3/8" drive ratchet, might just get a 30mm ring spanner.

Toddler78, to clarify was referring to whether a washer was used and if so what size or if threadlocker was used for drain plug, (1), and also wanted to know the size of the filler plug, (2).

Thanks for the replies.

[itsme4g63]

I would suggest you get the 30mm socket if that's what it is, most likely a socket that big will have a 1/2" drive, but if you do not have a 1/2 drive ratchet, you can always get a 3/8-1/2 adapter, I just wouldn't put much tq into it because it will snap.

[Rydogz]

An adapter/extension will effect torque calculations though will it not? Seems not worth it, specified to 30 nm for both plugs, or i could just do the filler plug up with a spanner and torque the drain plug? torquing diff seems overkill.

What does everyone use as a thread locker out of curiosity?

[macca_779]

An adapter/extension will effect torque calculations though will it not? Seems not worth it, specified to 30 nm for both plugs, or i could just do the filler plug up with a spanner and torque the drain plug? torquing diff seems overkill.

What does everyone use as a thread locker out of curiosity?

Torque is not effected by extensions. Crows foots do if fitted parallel.. That's why it's good practice when using them to set them at 90 degrees so it doesn't effect the torque.


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[bush_basha]

Torque is not effected by extensions.


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are you sure about that, I'm pretty sure it is. the longer the extension the more its going to effect the torque. I've always seen that using an extension alters the amount of torque!

[macca_779]

are you sure about that, I'm pretty sure it is. the longer the extension the more its going to effect the torque. I've always seen that using an extension alters the amount of torque!

Yeah pretty sure. Or all tech schools are wrong.

You not adding leverage by using extensions.. If you are, show me the math.


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[VYSHSV8]

An extension bar aka 3" or 6" won't affect torque
But a longer breaker bar will I think some maybe thinking an extension bar is a longer handle which it isn't an extension bar is a bar that allows you to get the socket into deeper spaces


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[Peter B - CV8]

It's not a complicated process. I've done mine quite a few times - just using a big shifter to undo/tighten both filler & drain plugs. I've never used any thread lock/sealer & don't have any leaks etc. Neither of these bolts/plugs are holding great amounts of pressure....
It's usually a good idea to loosen the filler plug before removing the draining bolt.

[bush_basha]

Yeah pretty sure. Or all tech schools are wrong.

You not adding leverage by using extensions.. If you are, show me the math.


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not so much leverage but your allowing twist in the extension bar the longer it is the more twist your going to have. those torque limiting extensions work a similar way do they not? the smaller sized extension only allows for so much torque applied and then the go up in diameter?
correct me if I'm wrong but I have always thought that with extensions.

[VZ_V8]

If you are twisting a socket extension bar doing up a drain/filler bung on an alloy diff casing. Then you are doing it wrong...

A torque limiting extension bar is not made in the same way that a normal extension is.

[macca_779]

not so much leverage but your allowing twist in the extension bar the longer it is the more twist your going to have. those torque limiting extensions work a similar way do they not? the smaller sized extension only allows for so much torque applied and then the go up in diameter?
correct me if I'm wrong but I have always thought that with extensions.

I get what your saying. But no it doesn't work that way. As above torque limiting is completely different than using a conventional extension. I actually teach this stuff to aviation trainees.


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[Woodchukka]

not so much leverage but your allowing twist in the extension bar the longer it is the more twist your going to have. those torque limiting extensions work a similar way do they not? the smaller sized extension only allows for so much torque applied and then the go up in diameter?
correct me if I'm wrong but I have always thought that with extensions.

Even if the extension twists while using it the you will just end up with turning the torque wrench slightly more until it indicates the torque has been reached. The torque limiting extensions are for rattle or impact guns and work like a basically like a spring absorbing the shock of the hammer blows inside the gun and I think transferring some of that energy back to the gun to help absorb the next strike. So they will not work for a constant torsional force one would exert with a torque wrench or bar unless it broke at X amount of torque.

[Rydogz]

Bought a 30mm socket, and a cheap half inch drive ratchet in the end. No torque, no thread lock, no leaks, no worries.:driving:

Asked an engineer mate about the torque thing, and as a few have said the extensions do NOT effect torque.

Cheers everyone.

[fishman88]

oops had no idea that i clicked on dislike this post my bad must be my fat fingers...