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[Mikes1670]

Recently removed my cartridge type oil filter housing to get access to the oil cooler pipe connections and I was expecting to find a rubber seal between the housing and the engine casting but there wasn't one - there is just a circular recessed groove on the rear of the housing that marries with a raised circular rim on the mounting position that locates with the housing - how does it make an oil tight seal?

As I managed to get it off in tact I intend re-fitting it as I already have a new cartridge type filter as opposed to doing the screw-on conversion.

[Andy B]

There should be an O ring on the cup/filter housing 

[Darth Loo-knee]

As Andy says above there is a big rubber O ring that fits over the thread into its recess, which when you buy a new oil filter the o ring comes with it.
There is also a seal on the back of the housing which creates the seal to the block, but I have never had to change that one.
Hoe that helps

[TheBoy]

As Andy says above there is a big rubber O ring that fits over the thread into its recess, which when you buy a new oil filter the o ring comes with it.
There is also a seal on the back of the housing which creates the seal to the block, but I have never had to change that one.
Hoe that helps