Gearbox oil question

[Laird Scooby]

Originally Posted by loki_the_glt

As I've only driven one M90-box car I don't know whether it's a good, poor or indifferent changing box, only that I'd rather have an M47 hung off the back of the engine. And, yes, I do know that the M90 is the "better" box.

How does one drain and refill the box - are there separate drain and filler plugs/sockets and where do they hide?

The patch bolts appear to be part 9454743; how many of them do I need and are they available over-the-counter or special order from Gothenburg?

I might just get the seal and have the garage fit it IF the existing one looks to be dying.

To see if the existing seal is dying, the flywheel will need to come off (may have to for resurfacing/skimming anyway) so you may as well change it or have it changed i should say. As pointed out, they have to warranty theor work so it's down to them if it fails in short order.

I can never remember if it's 6 or 8 patch bolts on the flywheel on the red blocks, Luke would be able to confirm certainly as i think he has one or two spare or dead engines floating around. A volvo dealer could also advise on quantity and availability.

[360beast]

9496379 is the P/N for the flywheel bolts and there are 8.

[griston64]

Originally Posted by loki_the_glt

As I've only driven one M90-box car I don't know whether it's a good, poor or indifferent changing box, only that I'd rather have an M47 hung off the back of the engine. And, yes, I do know that the M90 is the "better" box.

How does one drain and refill the box - are there separate drain and filler plugs/sockets and where do they hide?

The patch bolts appear to be part 9454743; how many of them do I need and are they available over-the-counter or special order from Gothenburg?

I might just get the seal and have the garage fit it IF the existing one looks to be dying.

Here you go Alf


If your gearbox is changing fine and on fairly low miles I would leave it alone tbh

[loki_the_glt]

Originally Posted by griston64

Here you go Alf


If your gearbox is changing fine and on fairly low miles I would leave it alone tbh

It's on 224k and, as I remarked above, I've no idea whether it's a good, bad or indifferent box.

[baggy798]

Originally Posted by Clan

Yes without a doubt on any other car , and on a volvo if there is any sign of damp , but with 46 years experience on volvos if its dry ( and they usually are ) it will remain dry far into the future and a new one has been known to leak on two occasions that I know of just after a new seal has been fitted during a clutch replacement . .. that's the benefit of experience . The new seals they are using now are very different they are very thin and seem to be hard plastic rather than rubber and part of the front cover..

+1
Same as what the guy who changed my flywheel/clutch said. He recommended not to disturb it so I agreed. Same with the input shaft seal on the M90, it was bone dry in the bellhousing so also left that well alone.

Does anyone know the part number for the drain copper washer?

https://www.volvopartswebstore.com/s...ssembly=239237

Only lists the fill one, 11998, maybe same for both?

[baggy798]

If you do take the flywheel off than the 946379 bolts are for the dogdish flywheel and too short (and 9454743 look too short as well).

https://www.fcpeuro.com/products/vol...760-240-946379

The dual mass takes longer ones, they're about 45mm long:
https://www.kgtrimning.org/accessori...rs/sb8271.html

Ah here we go. M10x45mm. 978271.
https://www.skandix.de/en/spare-part...n-m10/1029277/

There's also the plastic ball seat thing on the clutch fork that wears. In extreme cases it wears through that and the fork as well.
3549983 Release fork
3549638 Pivot pin
9163851 Ball seat

[360beast]

Originally Posted by baggy798

If you do take the flywheel off than the 946379 bolts are for the dogdish flywheel and too short (and 9454743 look too short as well).

https://www.fcpeuro.com/products/vol...760-240-946379

The dual mass takes longer ones, they're about 45mm long:
https://www.kgtrimning.org/accessori...rs/sb8271.html

Ah here we go. M10x45mm. 978271.
https://www.skandix.de/en/spare-part...n-m10/1029277/

There's also the plastic ball seat thing on the clutch fork that wears. In extreme cases it wears through that and the fork as well.
3549983 Release fork
3549638 Pivot pin
9163851 Ball seat

Ah yes brain fart on my part I'm so used to removing dual masses and fitting dogdishes!

[loki_the_glt]

Originally Posted by 360beast

Ah yes brain fart on my part I'm so used to removing dual masses and fitting dogdishes!

What happens to the old DMFs?

[360beast]

Originally Posted by loki_the_glt

What happens to the old DMFs?

The owner takes them away and usually weighs them in.

I've got one here I think that I'm keeping for some random reason that I'm sure will become apparent in the fullness of time.

[classicswede]

Originally Posted by loki_the_glt

What happens to the old DMFs?

Fix a chain to them and you can use it to stop your boat floating away