When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
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.
I've seen a few engines with oil pressure relief valves that have a sealing ring around them. Now exactly sure what vintage these came from...I never thought it important enough to record the information.
All the replacements I've ever obtained do not have this feature.
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!
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.
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.
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.
Oil bores with engine assembly oil. Insert. Use new sealing washers. Torque. Forget.
07-30-2017, 11:45 AM
Oil pressure regulator 'piston with sealing strap'
