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1991 240 Differential Fill and Drain Plug Thread Size

S

sjulier

Member
Joined
Nov 20, 2013
Location
Hamden CT
I just purchased a 1991 240.

Does anyone know the thread size for the fill and drain plugs?

Thanks in advance.

Sam
 
There is no drain plug. You remove the lowest bolt on the diff cover and that lets the fluid drain. I think it's a m8 1.25 bolt about 15-20mm long. The fill plug is m14 1.25 if I recall correctly. I needed a new fill plug and it was the same as a metric oil drain plug for another car.
 
Remember to open the fill plug first before draining the diff - if it's seized you want to find that out before letting all the gear oil out.
 
dl242gt said:
There is no drain plug. You remove the lowest bolt on the diff cover and that lets the fluid drain. I think it's a m8 1.25 bolt about 15-20mm long. The fill plug is m14 1.25 if I recall correctly. I needed a new fill plug and it was the same as a metric oil drain plug for another car.
Click to expand...

That?s true on my 1993 Classics. But not on this car. It has a drain on the underside of the diff.

I?d like to get at least one plug with a magnet.

Sam
 
dl242gt said:
If none of the plugs are damaged. I'd clean them and keep using them. Volvo uses good hardware.
Click to expand...

I?m having the pinion seal and rear plate seal replaced on Monday at Mitchell Differential in Shrewsbury Mass. I?ll ask them for the sizes.

The fill plug is huge with a square male bit, if that?s what it?s called. Definitely NPT - does not seat flush. The treads are exposed.

The drain plug is on the underside of the unit. It appeared to be flanged and is flush to the unit. The drive appears to be 6 sided.

As I said earlier, I?m used to 1993 240s. I?ve never seen this set up.

Sam
 
sjulier said:
That?s true on my 1993 Classics. But not on this car. It has a drain on the underside of the diff.

I?d like to get at least one plug with a magnet.

Sam
Click to expand...

I took apart a rear end recently, I have not filled the diff up with fluid. I'll see if I can check the drain plug size. If I'm not mistaken, its a magnetic plug.
 
The OE plug should have a magnet.

The alloy diff cover installed ~1992+ has a screen filter and magnet which does seem to help with longevity & heat exchange a bit?

Is this an anti-lock brake optioned 1991 200 series or non-abs?
 
Kjets On a Plane said:
The OE plug should have a magnet.

The alloy diff cover installed ~1992+ has a screen filter and magnet which does seem to help with longevity & heat exchange a bit?

Is this an anti-lock brake optioned 1991 200 series or non-abs?
Click to expand...

This 1991 is non-abs.

The fill plug has a 11/16? square head. I will get it off and and post measure measurements tomorrow - hopefully.

Sam
 
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