Spin On Oil Filter Adaptor

[martx-5]

I've done alot of reading here on this forum about the spin-on adaptors that leak. I bought one from Moss (part#635-828) for my TR3 last year along with a bunch of other stuff. I just got around to installing it on the engine rebuild. Everything looks pretty good.

Where exactly were these things leaking?? It looks to me that the only place that could leak is where the adaptor mates with original filter head. If the small O-ring bottoms before the large one in the filter head.

 

[TR3driver]

Mine doesn't leak <G> But in addition to the potential problem you note, I've heard reports of the two sealing surfaces not being machined well. And of course the usual problems with folks not realizing there are two gaskets down in the groove.

Not sure what Moss is selling now, but at one time there was a nut on the center fitting, which apparently sometimes the filter would bottom against, keeping the outer ring from sealing properly.

Boils down to poor quality control, IMO, never the same way twice.

Randall

 

[TexasKnucklehead]

I don't think mine was tightened properly on my TR6 -or perhaps over tightened when originally installed. I drove the car for over a year before a friend pointed out how much it leaked on his new driveway. I knew I had to occasionally add oil, but thought the engine was burning it. Once I replaced the o-rings, I stopped having to add oil, and have no leaks. It's been a few years.

Jer

 

[Brosky]

I only hope that my "new and improved leak proof" adapter does what the old style adapter did and that was NOT LEAK!

Luckily, I never had any problem with that at all.

Now if you want to talk about timing cover seals, axle seals, rear main seals..........nahh, forget it. Too depressing.

 

[martx-5]

... And of course the usual problems with folks not realizing there are two gaskets down in the groove.


Randall

Tell me more about the two gaskets (O-Rings) down in the groove, because I'm apparently one of those that doesn't realize that. There were two large O-Rings in the kit as well as two adaptor screws. The two O-Rings were of different thicknesses. The heights and outside diameters looked about the same. I assumed that the different O-Rings went with the different adaptor screws for the two different type original filters. I put the fatter O-Ring in there, as it fit snugly in the groove.

 

[TR4nut]

I just changed the original filter in the TR4 project I have and I only pulled one old gasket out of the ring - I thought the typical mistake was people not removing the old gasket, then adding another to accidently get 2 gaskets. Not true? The stock filter kit (Crosland?) had 3 gaskets to use, I picked the one that best matched the old one and refit. Also managed to get the 10 year idled engine back and running and I don't see it leaking yet..


Randy

 

[TR3driver]

I thought the typical mistake was people not removing the old gasket, then adding another to accidently get 2 gaskets.

That's it exactly.
Sorry if I confused the issue. The groove is kind of deep, so it can be hard to determine sometimes if there is an extra gasket in it. There should be only one.
Best practice IMO is to clean the groove until you can see aluminum at the bottom all the way around, then install only one gasket, the one that fits best (snugly) in the groove.

https://www.mossmotors.com/graphics/produ...nstructions.pdf