Oil filters, how on earth do they come apart?

[Murv]

Anyone familiar with this type? It looks as if the cap is held on by a long bolt, but when that's removed, the lid won't tap off or unscrew.
Anyone know? I don't want to get too brutal with a hammer just yet...



Fitted to Volvo TAMD61A

 

[rosssavage]

Are you sure they're oil filters? Never seen them like that before, and the caps don't look anything like man enough for pressurised oil (20psi +). I've only ever seen spin on filters for the 6litre VP engines of this era..

You do seem to have remote filters - have you followed the two green painted hoses to the left of the left hand filter cap? They will go to the remote filter assembly...

 

[Murv]

Hi Ross, yes, those lead to the conventional spin-on filters.
I'm fairly sure that these are oil bypass filters (they certainly have oil in them) but happy to be corrected!

 

[Spi D]

Is this any help?

 

[Murv]

Yes it is, thank you. The cap does lift off, it just needed a bit more enthusiasm than I'd had!

 

[oldgit]

I have a full range of both metric and imperial hammers on the boat !

 

[Spi D]

No reason to be violent. Grab a bigger hammer.

 

[volvopaul]

It's a bypass oil filter , it bleeds off the main gallery back to the sump sort of a constant filtration system.

 

[Murv]

Thanks Paul, no-one at the club has them, or have even heard of them. Are they worth having?
I've replaced the cartridges for now, just wondering if they give any benefit on a leisure boat that will have frequent oil and filter changes anyway.

 

[rafiki_]

I have a full range of both metric and imperial hammers on the boat !

Any left handed ��

 

[Latestarter1]

Thanks Paul, no-one at the club has them, or have even heard of them. Are they worth having?
I've replaced the cartridges for now, just wondering if they give any benefit on a leisure boat that will have frequent oil and filter changes anyway.

No no no.................

Complete junk!

Unless approved by Volvo Penta which I doubt these filters actually remove components in the base lube additive which leads to a rapid decline in in TBN.

Simply a bog roll in a fancy tin can, all smoke and windows!

 

[rafiki_]

Simply a bog roll in a fancy tin can, all smoke and windows!

Shear quality Paul?

 

[nigelmercier]

Any left handed [hammers]

I've got left handed hammers, screwdrivers, and hand saws. I've only got right handed nails, but they seem to be compatible.

 

[Murv]

No no no.................

Complete junk!

Unless approved by Volvo Penta which I doubt these filters actually remove components in the base lube additive which leads to a rapid decline in in TBN.

Simply a bog roll in a fancy tin can, all smoke and windows!

Well, that's reassuring :ambivalence: Still, at least it was only an Hour or so of struggling to do them!
Volvo do offer a bypass system, although it's different to the one I have. I'll try and contact them today and remove the cartridges if they advise to do so.
Wouldn't the alkaline components of the oil still neutralise any acid as they pass through the bypass though, if trapped inside?
Actually, no matter, if they're junk I'll get them out.

 

[rafiki_]

I've got left handed hammers, screwdrivers, and hand saws. I've only got right handed nails, but they seem to be compatible.

��

 

[Latestarter1]

Well, that's reassuring :ambivalence: Still, at least it was only an Hour or so of struggling to do them!
Volvo do offer a bypass system, although it's different to the one I have. I'll try and contact them today and remove the cartridges if they advise to do so.
Wouldn't the alkaline components of the oil still neutralise any acid as they pass through the bypass though, if trapped inside?
Actually, no matter, if they're junk I'll get them out.

I do not do V.P. stuff but in automotive not aware that they offered an aftermarket system.

Cat, Cummins, Volvo (automotive) have a very oblique approach to this style of bypass filtration, 'they neither approve or disapprove of its use'. Mercedes Benz (Detroit, MTU) are far more assertive in their oils handbook, in that they expressly disapprove of the use.

The oil additive pack among the sexy chemicals contains metals which actively react with the other components (I m no tribologist), filter part of the additive pack and it degrades more quickly resulting in rise in TAN.

Long drain oil solutions work because as oil degrades engines start to consume lube, you top up more frequently restoring the additive pack, and the cycle continues, however in the long term engine develops an increasing thirst for lubricant. People will tell you that you can double, even triple manufacturers recommended intervals with no ill effects using bypass filtration. Simply not true.