Thread: Tapping oil pump cover for turbo oil return

Yep agreed, looking at that 1/4" is the biggest that can be safely tapped there.

Without knowing the specifics of my turbo I don't think I'm comfortable with a 1/4" drain. That's less than half the size of the drain barb on the bottom of my turbo.

Thanks for the info. I'll look for a new drain point for the moment.

When mike did his at my place, I'm fairly sure he drilled and tapped a half inch hole in the centre

What about tapping the factory turbo drain location ?

Originally Posted by Vern

When mike did his at my place, I'm fairly sure he drilled and tapped a half inch hole in the centre

I didn't think that was possible as it would foul the breather above and interfere with the shaft below.. Guess I should have put more thought into it

iirc he put a 45 degree fitting in it.

Originally Posted by Vern

When mike did his at my place, I'm fairly sure he drilled and tapped a half inch hole in the centre

I guess it might be fine, but I sure don't fancy that! Hard to explain without more photos, but that sounds sketchy to me. The shaft below slots into the centre hole of the cover. Not a fan of potentially altering it's movement... Plus draining onto that shaft wouldn't leave much room for the oil to drain properly from what I can see....

Originally Posted by Vern

When mike did his at my place, I'm fairly sure he drilled and tapped a half inch hole in the centre

If thats what he did then I'm surprised that he ever got it to drain well enough as the shaft blocks that hole completely once the cover is fitted (apart from a few thou clearance for it to run in.

I know I had discussion with Mike as to what size he was using, but it could have been over the phone or PM if its not in his thread.
Watch out for the internal bore of the fittings you use Judo - as some have very thick walls and small bores. Drill them out if necessary.

I think bee utey's suggestion of fitting a pipe end using silver solder or pressing would be the most practical to get the largest bore in the limited space available.

Other option is the breather cover as someone said earlier. I think Rovercare took that option with his 120 build. I think that's where my provent drain goes and IIRC there was reasonable thickness to do it.

Steve

Hmm may be I glazed over it, but I just remember him saying something about tapping a bigger hole in it and that he could only get a small hole if he put it off centre like in judo's pic. I really didn't take that much notice