Tapping sump for oil return

[Toby_Unna]

feeling in a mood to get things done this morning so i think i'll drop the subframe and sump to tap it for the turbo oil return

only question is what size thread shall i tap it to?

i'm thinking i want a lot of flow, so i was going to tap it to the size of the smaller power steering pump banjo connection, which is something like m14 x 1.5.

i haven't sorted the return pipe yet but i guess if i do it this size i can use PAS pipe/connections if all else fails.

any thoughts (i.e. is that too big)

not sure where i'll get the tap from though, mine don;t go that big

[Ant]

Use a surface mounted return fitting Toby, the Landrover/320D unit is cheap and easily found, alternative is the merc C250TD unit, both accept a standard 5/8th hose no problemo, no leaks on mine in almost a year too

the sump is too thin and grainy to reliably use a banjo IMHO,

suface mount= 1x 10mm hole for return flow, 2x M6 bolts , job done fella

I have a spare Garrett retun fitting for the turbo if req btw ??

[e30_Turbo]

just like this

[Toby_Unna]

ok we'll just quietly forget that i've spend the last 15 mins filing myself a suitable tap from an old banjo bolt because i can't find one

that's good Ant, tbh seems a better solution to me. i've just heard too many people talking about tapping their sumps... mostly on e30tech

just incase you know - what's the bolt spacing for the mount bolts?

i'm assuming the same as either turbo oil inlet or outlet (i.e. approx 38.5mm or 51mm centre to centre)

you've got a few hours m8, gotta drop the subframe and have the sump off first!

if you have one spare you don't need i'll happily buy it

[gcorky]

is that below the oil level?

[Toby_Unna]

is what below the oil level?

[gcorky]

[img][img]http://img162.imageshack.us/img162/4203 ... 2qy.th.jpg[/img][/img]

i meant the return fitting below oil level or above.

heres a front mounted one.

[Ant]

The return is above the baffle plate level and way above the oil level.



I have some internal pix somewhere .......

edit: that silicone steam hose was a temp fit , we used that so see the oil flow was correct.

[Jon_Bmw]

As said don't be tapping it, its way to thin to be doing that, its asking for leaks. I used a gas fitting that clamps up to either side of the sump, seems to work very well for me and its positioned in the same place as in the picture G corky supplied.