Oil pressure regulator 'piston with sealing strap'
#1
Rennlist Member
Thread Starter
Oil pressure regulator 'piston with sealing strap'
Hello All,
I have removed the oil pressure regulator and bypass caps, springs, and plungers from the engine in the Red Witch. I have new springs and crush rings to go on.
Last night at work, I cleaned all the parts in the heated parts washer. After cleaning, I saw a little discoloration on the pressure regulator plunger. Out of curiousity, I looked up this plunger on AutoAtlanta's website. I was wondering how much a new one cost.
Well...according to the AutoAtlanta version of PET, it is called 'piston with sealing strap.'
Say what? I saw no sealing anything on the plunger I pulled out. To my knowledge, the last time this piston was out was just before it was installed in this engine. As well, I saw nothing down the plunger bore in the block.
Anyone know what this means? Am I missing a sealing 'something' for the oil pressure regulator plunger?
On this screenshot, it is item #48, circled in red.
Photos of my parts are in my camera. I will try to download and post them tonight.
I have removed the oil pressure regulator and bypass caps, springs, and plungers from the engine in the Red Witch. I have new springs and crush rings to go on.
Last night at work, I cleaned all the parts in the heated parts washer. After cleaning, I saw a little discoloration on the pressure regulator plunger. Out of curiousity, I looked up this plunger on AutoAtlanta's website. I was wondering how much a new one cost.
Well...according to the AutoAtlanta version of PET, it is called 'piston with sealing strap.'
Say what? I saw no sealing anything on the plunger I pulled out. To my knowledge, the last time this piston was out was just before it was installed in this engine. As well, I saw nothing down the plunger bore in the block.
Anyone know what this means? Am I missing a sealing 'something' for the oil pressure regulator plunger?
On this screenshot, it is item #48, circled in red.
Photos of my parts are in my camera. I will try to download and post them tonight.
#2
Rennlist
Basic Site Sponsor
Basic Site Sponsor
Hello All,
I have removed the oil pressure regulator and bypass caps, springs, and plungers from the engine in the Red Witch. I have new springs and crush rings to go on.
Last night at work, I cleaned all the parts in the heated parts washer. After cleaning, I saw a little discoloration on the pressure regulator plunger. Out of curiousity, I looked up this plunger on AutoAtlanta's website. I was wondering how much a new one cost.
Well...according to the AutoAtlanta version of PET, it is called 'piston with sealing strap.'
Say what? I saw no sealing anything on the plunger I pulled out. To my knowledge, the last time this piston was out was just before it was installed in this engine. As well, I saw nothing down the plunger bore in the block.
Anyone know what this means? Am I missing a sealing 'something' for the oil pressure regulator plunger?
On this screenshot, it is item #48, circled in red.
Photos of my parts are in my camera. I will try to download and post them tonight.
I have removed the oil pressure regulator and bypass caps, springs, and plungers from the engine in the Red Witch. I have new springs and crush rings to go on.
Last night at work, I cleaned all the parts in the heated parts washer. After cleaning, I saw a little discoloration on the pressure regulator plunger. Out of curiousity, I looked up this plunger on AutoAtlanta's website. I was wondering how much a new one cost.
Well...according to the AutoAtlanta version of PET, it is called 'piston with sealing strap.'
Say what? I saw no sealing anything on the plunger I pulled out. To my knowledge, the last time this piston was out was just before it was installed in this engine. As well, I saw nothing down the plunger bore in the block.
Anyone know what this means? Am I missing a sealing 'something' for the oil pressure regulator plunger?
On this screenshot, it is item #48, circled in red.
Photos of my parts are in my camera. I will try to download and post them tonight.
All the replacements I've ever obtained do not have this feature.
Move forward.
__________________
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
#4
Rennlist Member
Thread Starter
Just for posterity, here are the photos of the oil pressure regulator and oil bypass valves.
Oil pressure regulator on left, bypass on right. These are how they came out of the engine.
Parts cleaned, though the orientation is swapped. Bypass is on the left, oil pressure regulator is on the right. The plunger in question is circled in red.
Oil pressure regulator on left, bypass on right. These are how they came out of the engine.
Parts cleaned, though the orientation is swapped. Bypass is on the left, oil pressure regulator is on the right. The plunger in question is circled in red.
#6
Rennlist Member
Thread Starter
Hi Dave928S!
Parts washer uses an aqueous based solvent. I don't know the specs offhand. Past experience has shown it will eat plating and discolor aluminum.
As such, I limit part exposure to the solution to only a few monents. IE, a short soak and long enough to scrub. Followed by a rinse in a bucket of hot water, then a final spray down with contact cleaner.
Discoloration on the regulator piston was lessened after cleaning. It cannot be felt with a finger.
To be blunt, not sure what to polish it with.
Parts washer uses an aqueous based solvent. I don't know the specs offhand. Past experience has shown it will eat plating and discolor aluminum.
As such, I limit part exposure to the solution to only a few monents. IE, a short soak and long enough to scrub. Followed by a rinse in a bucket of hot water, then a final spray down with contact cleaner.
Discoloration on the regulator piston was lessened after cleaning. It cannot be felt with a finger.
To be blunt, not sure what to polish it with.
#7
Rennlist
Basic Site Sponsor
Basic Site Sponsor
Hi Dave928S!
Parts washer uses an aqueous based solvent. I don't know the specs offhand. Past experience has shown it will eat plating and discolor aluminum.
As such, I limit part exposure to the solution to only a few monents. IE, a short soak and long enough to scrub. Followed by a rinse in a bucket of hot water, then a final spray down with contact cleaner.
Discoloration on the regulator piston was lessened after cleaning. It cannot be felt with a finger.
To be blunt, not sure what to polish it with.
Parts washer uses an aqueous based solvent. I don't know the specs offhand. Past experience has shown it will eat plating and discolor aluminum.
As such, I limit part exposure to the solution to only a few monents. IE, a short soak and long enough to scrub. Followed by a rinse in a bucket of hot water, then a final spray down with contact cleaner.
Discoloration on the regulator piston was lessened after cleaning. It cannot be felt with a finger.
To be blunt, not sure what to polish it with.
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#9
Rennlist Member
Thread Starter
Note, all further work done to the engine and accessories on the Red Witch will be documented in this thread:
https://rennlist.com/forums/928-foru...l#post14536481
https://rennlist.com/forums/928-foru...l#post14536481
Last edited by skpyle; 10-14-2017 at 11:56 PM.