Oil gallery tapping without disassembly

[VX BlackRat]

Hi,
Need to use a larger fitting onto an oil gallery for an accusump. Is it possible to tap without having to disassemble the engine, I.e is there a method of capturing all the swarf?
Cheers

[stevieturbo]

depends on the engine, your plumbing config...etc etc

If badly stuck, just use a sandwich plate for the filter or something

[Evoluzione]

Vague question.
Is it alloy?

[VX BlackRat]

Its a GM 4cy ecotec engine, alloy block.
Planning to put the new oil fitting along the main galley that runs longitudinally. There are some m12 plugs along this gallery and I want to increase 1 of them to 3/8 unf.
I’m hoping I can drill and tap for larger fitting then hoover swarf out?

What’s a sandwich plate?

[stevieturbo]

It's where you're in over your head with a total lack of experience.

And 3/8" is approx 9.8mm.

M12 is well....12mm.

How do you propose a 3/8" UNF thread is an increase over M12 ?

[VX BlackRat]

Sorry brain fade 3/8 NPT pipe size not UNF

[stevieturbo]

And what diameter are the ID of the internal galleries ?

I would not be trying to drill any block for that sort of fitting. The chances of you having enough material are very slim, but it should be obvious when looking at it.

And not a chance would I be trying to do it on a working good engine when it is installed in the car.

If there are already other pre-threaded options, use them. Or as already said use a sandwich plate at the filter.

[VX BlackRat]

Just checked out the filter sandwich idea and found the perfect solution, this was just the kind of lateral thinking that I needed. Many thanks!