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RB25 Oil Pump Regulator Washer???

TurboTapin
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TurboTapin Proficient

TurboTapin

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Posted (edited)

With my block out to get honed, I'm just prepping all my auxiliary components in my mean time. I took my oil pump apart to inspect and repack it with assembly lube and either haven't noticed this in the past or found my answer and can't remember. What exactly is the regulator washer that the manual mentions replacing? I don't have one and from the manual it seems to seal the regulator plug to the housing but I can't see it on any pictures of new pumps either.

Can anyone fill me in? I'm presuming this was phased out as I also can't find a replacement part in epc. 

image.thumb.png.72aa050883f1b81a0786470b6324dfd0.png

 

Image of a new pump. Can't see a washer there either.

image-117__91243.1529961945_17a87694-5fd9-4424-ac75-d0dc8ad1c9d5_1020x665.thumb.webp.901dbd7fb5fa731beb6f2db25d26e9d0.webp

Edited by TurboTapin
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https://www.sau.com.au/forums/topic/486184-rb25-oil-pump-regulator-washer/
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joshuaho96 Veteran

joshuaho96

Posted
Posted
22 hours ago, TurboTapin said:

With my block out to get honed, I'm just prepping all my auxiliary components in my mean time. I took my oil pump apart to inspect and repack it with assembly lube and either haven't noticed this in the past or found my answer and can't remember. What exactly is the regulator washer that the manual mentions replacing? I don't have one and from the manual it seems to seal the regulator plug to the housing but I can't see it on any pictures of new pumps either.

Can anyone fill me in? I'm presuming this was phased out as I also can't find a replacement part in epc. 

image.thumb.png.72aa050883f1b81a0786470b6324dfd0.png

 

Image of a new pump. Can't see a washer there either.

image-117__91243.1529961945_17a87694-5fd9-4424-ac75-d0dc8ad1c9d5_1020x665.thumb.webp.901dbd7fb5fa731beb6f2db25d26e9d0.webp

Weirdly I see a flat washer on aftermarket pumps but as you said it doesn't seem like new OEM pumps have it. EPC doesn't break out the regulator as a separate component either. I'm guessing if the pump came that way it's safe to use as-is. 

GTSBoy Grand Master

GTSBoy

Posted
Posted

Meh, what's the worst that can happen? If is is supposed to have a washer, and:

  • the spring retainer seals reasonably well on the surface, maybe just allowing a little bleed of oil out, and
  • the spring does not coil bind when compressed that little extra bit, then

the end result will be slightly higher relief pressure setpoint, and no other noticeable effects.

MBS206 Grand Master

MBS206

Posted
Posted

It's purpose will be to stop the regulator plug from leaking oil.

As GTS said, if it seals properly, it will mainly just have the effect of slightly higher oil pressure. I'll assume tolerances/fitment in the relief valve aren't that close that the washer being missing won't let it vent at 100% capacity too.

TurboTapin Proficient

TurboTapin

Posted
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Posted
12 hours ago, joshuaho96 said:

Weirdly I see a flat washer on aftermarket pumps but as you said it doesn't seem like new OEM pumps have it. EPC doesn't break out the regulator as a separate component either. I'm guessing if the pump came that way it's safe to use as-is. 

 

11 hours ago, GTSBoy said:

Meh, what's the worst that can happen? If is is supposed to have a washer, and:

  • the spring retainer seals reasonably well on the surface, maybe just allowing a little bleed of oil out, and
  • the spring does not coil bind when compressed that little extra bit, then

the end result will be slightly higher relief pressure setpoint, and no other noticeable effects.

 

6 hours ago, MBS206 said:

It's purpose will be to stop the regulator plug from leaking oil.

As GTS said, if it seals properly, it will mainly just have the effect of slightly higher oil pressure. I'll assume tolerances/fitment in the relief valve aren't that close that the washer being missing won't let it vent at 100% capacity too.

 

This is a pump I have used in the past; no oil ever leaks or gets past the regulator plug.I was trying to understand what caused Nissan to not only mention it in their manuals but to also state it's a replacement part yet the part cannot be found on my pump or on any new pumps and there doesn't seem to have ever been a replacement part#. 

First time I've noticed something strange like this from NIssan. 

 

 

joshuaho96 Veteran

joshuaho96

Posted
Posted
17 hours ago, TurboTapin said:

 

 

 

This is a pump I have used in the past; no oil ever leaks or gets past the regulator plug.I was trying to understand what caused Nissan to not only mention it in their manuals but to also state it's a replacement part yet the part cannot be found on my pump or on any new pumps and there doesn't seem to have ever been a replacement part#. 

First time I've noticed something strange like this from NIssan. 

 

 

I have seen this happen in cases like the R33 GTR where they eliminated the ATTESA actuator rod retaining clip to save 5 cents. Parts diagram references it, the actual part doesn't. Also if you try and look up the specific retaining clip on an R33 GTR it resolves to nothing. But it exists on R32 GTRs as I discovered a week or two ago.

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