Stuck OPR Valve
Total posts: 2277
Last post: Oct 6, 2022 Member since:Nov 18, 2007
|
Cars in Garage: 0
Photos: 77 WorkBench Posts: 2 |
|
Ok. Gotcha. I thought maybe you didn't have a gauge. With a gauge, CupCake's advice works. But most without a gauge won't know until it's too late.
Total posts: 328
Last post: Jun 9, 2018 Member since:Sep 28, 2010
|
Cars in Garage: 1
Photos: 67 WorkBench Posts: 0 |
|
Shrimps. To be honest, unless you are really in tune with your motor, i don't know that 90% of owners would even without an actual oil pressure gauge... until something seized from lack of lubrication. Easy fix...Grab a simple oil pressure gauge.
I was only asking to know "just in case" should I ever be presented with the symptom. My current car with Smiths gauge shows 50 at idle & 75 zipping down the road.
Total posts: 1716
Last post: Oct 18, 2020 Member since:Oct 18, 2011
|
Cars in Garage: 0
Photos: 0 WorkBench Posts: 0 |
Mur, im aware of the fact that an adjuster can only adjust. lol. My question to CupCake was asked because he said he needed to shorten the spring. Sounds like he had to adjust the length of it. An adjustable spring cap might do the trick.
Even after polishing the plunger, I still had a couple hiccups. Might have to try the ball on my new motor.
"Adjustable" spring caps cost $$ As its something you set and forget, a few appropriately sized washers will do the job for CC (cents.
IMHO if the chunks floating around inside your motor are big enough to jam the OPR then you have more difficult problems to ponder then whether to use a plunger or a ball....
Cheers, Ian
Total posts: 2277
Last post: Oct 6, 2022 Member since:Nov 18, 2007
|
Cars in Garage: 0
Photos: 77 WorkBench Posts: 2 |
|
Mur, im aware of the fact that an adjuster can only adjust. lol. My question to CupCake was asked because he said he needed to shorten the spring. Sounds like he had to adjust the length of it. An adjustable spring cap might do the trick.
Even after polishing the plunger, I still had a couple hiccups. Might have to try the ball on my new motor.
Total posts: 5840
Last post: Nov 1, 2019 Member since:Nov 12, 1999
|
Cars in Garage: 0
Photos: 0 WorkBench Posts: 0 |
|
An adjustable cap only adjusts things, it has no effect on whether or not a piece of schmutz can get caught and make the plunger stick.  olish the sides of the plunger. A ball will not stick as a result of detritus but can wear the valve seat.
Total posts: 2277
Last post: Oct 6, 2022 Member since:Nov 18, 2007
|
Cars in Garage: 0
Photos: 77 WorkBench Posts: 2 |
|
Roger that. So would an adjustable OPR cap (the screw type) potentially solve that?
Total posts: 10335
Last post: Aug 19, 2016 Member since:May 13, 2001
|
Cars in Garage: 0
Photos: 0 WorkBench Posts: 0 |
|
MM. The ball bearing works fine but sometimes the pressure 'flutters' somewhat. I had to shorten the spring to get OP in the proper range.
The power of accurate observation is commonly called cynicism by those who have not got it. G.B.S. Sarcasm is the lowest form of wit. Oscar Wilde
//www.cupcakecooper.ca/
Total posts: 2277
Last post: Oct 6, 2022 Member since:Nov 18, 2007
|
Cars in Garage: 0
Photos: 77 WorkBench Posts: 2 |
|
CupCake, have you had any issues with the ball bearing that would keep you from going that route? I had the same issue once with the plunger getting stuck and had a few lengthwise scores that I eventually lightly sanded down and then polished the plunger to a high gloss.
Shrimps. To be honest, unless you are really in tune with your motor, i don't know that 90% of owners would even without an actual oil pressure gauge... until something seized from lack of lubrication. Easy fix...Grab a simple oil pressure gauge.
Total posts: 10335
Last post: Aug 19, 2016 Member since:May 13, 2001
|
Cars in Garage: 0
Photos: 0 WorkBench Posts: 0 |
|
My symptoms were a combination of Charrison ... 40 psi at speed (when usually 75) and going down with rpm to about 20 at idle, so stuck part way open. As an aside, my car had been running a bit rough in recent times. When I went to fix the OPRV I noticed the valve cover cap was off. I guess I forgot to put it back on on the last top-up.
The power of accurate observation is commonly called cynicism by those who have not got it. G.B.S. Sarcasm is the lowest form of wit. Oscar Wilde
//www.cupcakecooper.ca/
Total posts: 959
Last post: Feb 13, 2023 Member since:Sep 11, 2000
|
Cars in Garage: 0
Photos: 0 WorkBench Posts: 0 |
|
The OPR usualy opens at around 75 psi.
If the OPR sticks open, the high pressure output from the oil pump squirts straight back into the sump so you get no/low oil pressure round the important bits of the engine.
If the OPR sticks shut, when cold, you'll get very high oil pressure, maybe over 100 psi, which is not so good.
Car engines make CO2 and trees absorb CO2. By running your engine you're feeding a tree and helping the environment.
Total posts: 328
Last post: Jun 9, 2018 Member since:Sep 28, 2010
|
Cars in Garage: 1
Photos: 67 WorkBench Posts: 0 |
|
For those of us less edumucated folks can you explain the symptoms of a stuck OPR valve?
Thanks
Total posts: 8645
Last post: Dec 16, 2020 Member since:Oct 27, 2000
|
Cars in Garage: 0
Photos: 0 WorkBench Posts: 0 |
|
An easy way to get the plunger out is stick a 12mm dynabolt into it and tighten the nut finger tight. It makes a good handle to pull it out.
Kevin G
1360 power- Morris 1300 auto block, S crank & rods, Russell Engineering RE282 sprint cam, over 125HP at crank, 86.6HP at the wheels @7000+.
Total posts: 10335
Last post: Aug 19, 2016 Member since:May 13, 2001
|
Cars in Garage: 0
Photos: 0 WorkBench Posts: 0 |
|
Craig. I have the ball-bearing conversion in my Traveller but going to to stay with the bullet plunger on the S. This is the second time in 40 years it has stuck. All that came out with a magnet was a small fragment but there're a few lengthwise scores and one radial score on the plunger.
The power of accurate observation is commonly called cynicism by those who have not got it. G.B.S. Sarcasm is the lowest form of wit. Oscar Wilde
//www.cupcakecooper.ca/
Total posts: 1059
Last post: Sep 25, 2020 Member since:Mar 3, 1999
|
Cars in Garage: 0
Photos: 0 WorkBench Posts: 0 |
|
Craig
Total posts: 10335
Last post: Aug 19, 2016 Member since:May 13, 2001
|
Cars in Garage: 0
Photos: 0 WorkBench Posts: 0 |
|
My oil pressure was flakey today on the way to Starbucks today. The symptoms were consistent with a stuck OPR valve. After messing around without success with oil seal picks and other metods to pull it out, I stumbled on the idea of using a thread tap and found a 1/4 -18 NPT tap was perfect. It just engaged enough to get a bite on the valve to pull it out.
The power of accurate observation is commonly called cynicism by those who have not got it. G.B.S. Sarcasm is the lowest form of wit. Oscar Wilde
//www.cupcakecooper.ca/