Gear and Diff oil change
Discussion
I have a 94 plate Chimaera, with the rover gearbox and GKN diff.
I have ordered what I thought was enough oil of the correct type, but I am now finding conflicting information about the oil required.
Based on what I first found;
Gearbox - 1.5L required - 2L ordered
Diff - 2L required - 3L ordered
However I have read a few post today suggesting the gearbox needs 2.5L.
Can somebody please confirm how much oil is actually required for the diff and gearbox as I do not want to find out I am short once I start to fill it up.
I would also be very grateful if somebody could confirm the size and the size and type of tools required to get the drain and filler plugs out of the diff and gearbox.
Diff drain - 1/2" spanner
Diff fill - 1/2" drive (like the end of a socket extension bar)
Gear drain - spanner - size unknown
diff fill = 1/2" drive
The exhaust will be coming off to do this, which I understand will help with access.
I have ordered what I thought was enough oil of the correct type, but I am now finding conflicting information about the oil required.
Based on what I first found;
Gearbox - 1.5L required - 2L ordered
Diff - 2L required - 3L ordered
However I have read a few post today suggesting the gearbox needs 2.5L.
Can somebody please confirm how much oil is actually required for the diff and gearbox as I do not want to find out I am short once I start to fill it up.
I would also be very grateful if somebody could confirm the size and the size and type of tools required to get the drain and filler plugs out of the diff and gearbox.
Diff drain - 1/2" spanner
Diff fill - 1/2" drive (like the end of a socket extension bar)
Gear drain - spanner - size unknown
diff fill = 1/2" drive
The exhaust will be coming off to do this, which I understand will help with access.
Edited by Smokey Boyer on Sunday 27th March 14:42
The LT 77 requires 1.7 ltr of oil, you quoted spanner sizes are correct...
The GKN takes about 1.5 ltr, so 3 ltr will give you a refill....spanner sizes are correct
You do not need to take the exhaust off, waist of effort, but DO take out the filler plugs out first !
As to oils, see various heated debates, as to what is best
Frank
The GKN takes about 1.5 ltr, so 3 ltr will give you a refill....spanner sizes are correct
You do not need to take the exhaust off, waist of effort, but DO take out the filler plugs out first !
As to oils, see various heated debates, as to what is best
Frank
bluezeeland said:
Smokey Boyer said:
avoided the topic of which oil is best
I didn't take my 'zorst off - managed to leisurely fill the diff with a wheel off and a couple of feet of 15mm pushfit plastic plumbing pipe, tape and a funnel dangling in from the wheelwell.
Smokey Boyer said:
andy43 said:
Whaaaa...but Mobil1HalfordsBMWLonglifeCastrol... <explodes>
Refusing to take the bait.Just waiting for confirmation of the drive/spanner sizes for the gearbox please.
hillclimbmanic said:
bluezeeland said:
there you go !..............but; don't mention Difflok !
Now I HAVE to mention Difflok.!!Good?...Bad?...Expensive?...Or just indifference..?!!
Bad ? see above
Expensive ? Yes, very...
Indifferent ? I hear they are experiencing the 1 to 2 'crunch'on it......so, yes..
AV8 said:
Can anyone tell me the correct oil and quantity for a BTR diff please?
You will now get 18,000 answers all saying different oils and grades. 
Seek the advice of professionals such as on PH here: http://www.pistonheads.com/gassing/topic.asp?h=0&a...
Can anyone confirm the tool sizes below please
Diff drain - 1/2" spanner for 1/2" square male bolt head
Diff fill - 1/2" drive (like the end of a socket extension bar) for 1/2" female square socket
Gear drain - 1 1/4" or 32mm spanner for hex nut head
diff fill = 1/2" spanner for 1/2" square male bolt head
Also, which of these will need a new copper crush washer? What sizes are required?
I will be doing all this with the car raised on ramps/axel stands on my drive, and want to make sure I have everything I need before I start.
Diff drain - 1/2" spanner for 1/2" square male bolt head
Diff fill - 1/2" drive (like the end of a socket extension bar) for 1/2" female square socket
Gear drain - 1 1/4" or 32mm spanner for hex nut head
diff fill = 1/2" spanner for 1/2" square male bolt head
Also, which of these will need a new copper crush washer? What sizes are required?
I will be doing all this with the car raised on ramps/axel stands on my drive, and want to make sure I have everything I need before I start.
Edited by Smokey Boyer on Wednesday 30th March 09:10
Ive done loads of research on the oil for the LT77- basically ATF was specified as its syncro is not that strong and cant cut through thicker oil, so ATF is a nasty work around that causes the box to wear faster than needs be. Now difflock is a nice synthetic but costs a bloody fortune, but Comma does a 75 grade (relatively thin) full synthetic GL4 spec oil that seems ideal at about £10 a ltr. The LT77 is not a fussy gearbox oil wise, but it will be very notchy when cold if you run standard gearbox oil. You do need a GL4 grade, not GL5 (high shear grade) as some of the GL5 additives may cause problems with some of the metals used in the LT77.
http://www.commaoil.com/passenger-vehicles/product...
http://www.commaoil.com/passenger-vehicles/product...
Edited by blitzracing on Wednesday 30th March 11:26
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