What Is This? (Oil Block)

[negativecamber]

Hey all

I removed the heat transfer/oil filter block from my RB30 and found this inside. It's fairly solid and I'm wondering what the hell it is? Either something foreign or a smashed in factory something. Any ideas would be appreciated.

[89CAL]

There is supposed to be a solid metal plug in there as far as I know. not really sure what its for, never took mine out when I messed around with it.

[Ben C34]

Was that a patrol engine? The r31 and vl blocks don't have the heat exchanger at all.

[negativecamber]

It's a n/a rb30 series 2 block and it's an RB30DET now. I bought a half done motor and pretty much have pulled everything apart over months and rebuilding it. I figured I'd bugger off the bulky heat transfer and add an oil cooler and remote mount. This was the first time I removed it.

[negativecamber]

[Ben C34]

Someone added the heat transfer block then. I'm pretty sure the thing they destroyed in the process(your photo) is the oil filter bypass valve (used when the filter is blocked to bypass it)

I would pay carefully attention and see if you need to block it up or else you might be bypassing the oil filter now.

[jiffo]

Fairly certain my old 30 blocks had this filter by-pass valve.

It's a steel ball and spring style which when operating, simply by-passes the filter.

Yours would be doing this all the time.

I think I can see the remains of the spring in one of the photos, also not good.

Definitely needs attention.

If you're doing a rebuild, you need to remove all gallery plugs, strip/clean/flush anything to do with oil supply.

Don't trust any work done by a previous owner, as this clearly shows.

[negativecamber]

That's really heart breaking. I have just finished so much on this motor

[Ben C34]

It might not be all doom and gloom though. I think if you look into it the heat exchanger has the bypass valve in it, which is perhaps why the original owner hacked it out of the block.

You "might" be able to just put the heat exchanger back on, but the piece of spring sitting there is concerning and will need to be dealt with. It's also an indication of the previous owners workmanship which is a shame.

[Badgaz]

That's really heart breaking. I have just finished so much on this motor

look on the bright side...at least you found it now and didn't get left on the side of the highway wondering why your motor lunched itself.

[negativecamber]

The previous owner was a bell end. I bought the rb 25/30 all excited then I got home after the 2 hour drive and found rust and leaves all through it. I have removed the head and rebuilt based on these shonky findings.

I think I might try tapping a thread through the shit and screwing a bolt in there. I won't run the relief valve.

Edited September 13, 2014 by negativecamber

[Ben C34]

Fair enough. There's no real need to actually run the valve..its only there incase the filter gets so blocked it can't flow oil, which I'm sure you would never let it get that bad before servicing the car.

The only thing is to make sure you get rid of all of the swarf caused by tapping it.

[negativecamber]

I'll vacuum the hell out of it and I currently have the sump off so I'll make sure no dwarf gets anywhere. I had a similar experience with installing a rear head drain the other week.

It's a track only drift car so it will have regular fluid/filter changes.

Thanks for your help guys.

[Missileman]

Those fcuking dwarfs, you got watch them, they sneak in every where

Edited September 13, 2014 by Missileman

[negativecamber]

Haha just saw my mistype

[89CAL]

I think the 25 ' s have a plug there because as someone said the bypass is in the heat exchanger. So you just need something to block it off. I can look on fast for the part number if you would like?

[negativecamber]

If there is such a thing I'd be glad to find it. Currently there is a sleev wedged inside there that I can only think to tap a thread through.

[89CAL]

Plug, Blind - 11022-16A00

$5.72 out of Japan. Your local Nissan might have stock or be able to get one in

The parts diagram is not great, but its shown next to the filter stud so should be it.

[jiffo]

I've been changing oil filters for at least 50 years and I've never come across a spin-on that doesn't incorporate a by-pass valve.

Owners should understand the by-pass will open when the filter medium becomes blocked and also on cold start when oil is at its max viscosity.

[negativecamber]

A friend on mine just showed me his RB25 block and it has that nissan factory stopper in place. I'll suss out nissan to get one for me. Thanks again.