Technical RHB4 Turbo oil feed thread size?

[woj]

Hi all,

I am at the stage of trying to figure out what exactly the oil feed thread on the RHB4 turbo is, googling to no avail. I have one (turbo that is) in the basement, an M10x1.5 bolt fits in nicely but it is somewhat loose, so that is not it I guess. Could this be some NPT thread, like 1/8? Have no clue about the non-metric things...

 

[randomizered]

most machine shops will have a set of gauges for the thread and diameter.

 

[craigb244]

Im sure the oil feed Banjoes are a pretty standard size to the manufacture

I quick google search for "RHB4 turbo banjo bolt" threw up a eBay seller selling a line kit for that turbo with a banjo "M10x1.25mm"

Or even http://www.alibaba.com/product-free...hi_TD04_TD05_IHI_RHF4_RHB4_Turbochargers.html

"APPLICATION: Mitsubishi TD04, TD05/ IHI RHF4, RHB4 Turbochargers
INCLUDES: Steel Teflon line 104 cm with 4AN fitting / M10x1.25 mm (0.4375 in -24) Banjo Bolt Kit"

 

[fingers99]

On t'other hand, you'd not expect a M10 x 1.5 thread to fit in a M10 x 1.25 hole.

IIRC the tub is off a Uno, but I wonder if it might be the Garrett off a Mk.2, rather than the IHI off a Mk.1? IHI you'd expect to be metric, Garrett may well be Imperial.

In any event, if the end of the female thread has a conical seat, better to use a straight fitting rather than a banjo: the seat is supposed to create the seal.

 

[woj]

No conical seat from what I can see. I did the same eBay search, but it is defo not M10x1.25. The trubo is off Opel TD 1.7.

 

[fingers99]

I'd think it may well be a Garrett. The TD Astras certainly had them as standard fitment.

Any markings on the turbo?

A decent engineering shop is your best bet.

 

[woj]

I'd think it may well be a Garrett. The TD Astras certainly had them as standard fitment.

Any markings on the turbo?

A decent engineering shop is your best bet.

Yes, I know, I will be at one tomorrow and see...

It's defo IHI, it says so on the casing and I went to great lengths to find this particular one

 

[woj]

Yes, I know, I will be at one tomorrow and see...

It's defo IHI, it says so on the casing and I went to great lengths to find this particular one

So, as it turns out it is M10x1.5 (but not M10x1.25 as eBay suggests). As the guy in the shop said the looseness is within normal limits. At the same time I think I already made friends there, which is an achievement considering I do not speak the local language almost at all. I have enough of my turbo project ready to start posting some pics soon

 

[fingers99]

Good stuff!