What goes in this hole? (RB30 block)

[groovezog]

I'm putting together my RB30/26 build.

What's supposed to go in this hole, and where do I find it? Looks like an oil orifice or something.

I've searched a bit, and can't find it in the manual. A part number would help immensely. Also wondering if I can pull that part off an RB26 block.

[GTSBoy]

What does it say it is in the 30/26 build guide threads on here?

[GeeDog]

Just had a quick look an the RB30 block in my shed - that hole is either blocked with a solid plug of some sort (not a welsh plug), or it isn't actually a hole, just a slight depression in the casting - it's hard to tell. 

[Duncan]

I don't have a block handy, but I expect it is access to an oil gallery for cleaning, and therefore needs to be plugged again after machining and cleaning. There is no external feed there.

Also, be aware there are other plugs that have probably been removed during cleaning, in particular the one under the oil filter housing that will allow all the oil to drop back to the sump if it is missing....

[GeeDog]

Had a look at my other RB30 block and it is definately a plug of some sort (ignore the rust, this block has too many holes in it and is out in the weather):

[groovezog]

On 8/27/2021 at 5:20 PM, GTSBoy said:

What does it say it is in the 30/26 build guide threads on here?

Nothing that I could find. I scoured them pretty good before asking.

[groovezog]

On 8/27/2021 at 5:20 PM, GeeDog said:

Just had a quick look an the RB30 block in my shed - that hole is either blocked with a solid plug of some sort (not a welsh plug), or it isn't actually a hole, just a slight depression in the casting - it's hard to tell. 

That helps. Thanks.

On 8/27/2021 at 6:05 PM, Duncan said:

I don't have a block handy, but I expect it is access to an oil gallery for cleaning, and therefore needs to be plugged again after machining and cleaning. There is no external feed there.

Also, be aware there are other plugs that have probably been removed during cleaning, in particular the one under the oil filter housing that will allow all the oil to drop back to the sump if it is missing....

Yeah, looks like it's an oil passage, and the block was cleaned before being built. 

The one under the oil filter housing: Is that accessible from the outside, or only by taking the sump off? I've got a PRP prepped block and it came with the PRP block brace/AWD adaptor already installed...
Thanks for the help!

On 8/27/2021 at 11:58 PM, GeeDog said:

Had a look at my other RB30 block and it is definately a plug of some sort (ignore the rust, this block has too many holes in it and is out in the weather):

I'd guess that's hammered in since there's slot or hex key to pull it out... Hmm. 

 

Consensus seems that I can just measure the threads and plug it with a grub screw of some sort, eh? 

 

Thanks guys. I appreciate the help. 

[Duncan]

Unfortunately I don't have clear pictures, and this is for an RB26, but this is all of the oil and water plugs in the block according to FAST

Every shop will clean a block differently and some may put none (or worse some) of the plugs back. The welsh plugs are pretty obvious if they are missing, although there is a trickier one in the back of the head above where oil drains are often attached.

Checking the one under the oil filter housing requires removal of the filter mount and I think there are some differences for rb30 with how the filter mounts. The RB30 I have in the stagea has a stagea oil filter mount so I'm not sure of the standard setup.

 

[Shoota_77]

Main oil gallery plug.

They’re just an alloy punch in block off bung.  I threaded my holes (there’s one each end of the block) but you need to be very careful to not go too deep with your bolt as one of the head supply or main bearing galleries (can’t remember which…) comes off that passage quite close to where the bung goes in.

[groovezog]

Thanks so much! I appreciate the help.

I've ordered the part from Terra Firma.

Part number 11021AA

[groovezog]

Quick update for future searchers:

The RB26 plugs (11021AA) did not work for my RB30 block. My RB30 has threaded holes, and the RB26 plugs are pressed in for a compression seal. 

I was able to order the correct threaded plugs from Platinum Racing Products. Turns out my machinist had a few laying around as well though.