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WD45 - Very High Oil Pressure
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StanGreen View Drop Down
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Joined: 13 Nov 2022
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Points: 50 		Post Options Post Options   Thanks (0) Thanks(0)   Quote StanGreen Quote  Post ReplyReply Direct Link To This Post Topic: WD45 - Very High Oil Pressure
    Posted: 17 Oct 2024 at 8:52pm
On my WD45 today, I notices the oil pressure gauge is pegged to the high side at idle. I had the motor rebuilt last year. The oil does not look like it is over filled. Is it OK to have this high of oil pressure? If not, what would be my first step to address this issue?
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 81282 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 17 Oct 2024 at 9:00pm
get a good gauge and read the REAL pressure..
Like them all, but love the "B"s.
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Eric B View Drop Down
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Points: 946 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Eric B Quote  Post ReplyReply Direct Link To This Post Posted: 17 Oct 2024 at 9:12pm
I have the same issue with one of my 201 engines. I put a real gauge on there and it reads 90 lbs. I had to believe it reading a real gauge. Once the engine warms up the original gauge points straight up in the normal range (still about 45 lbs on the real gauge). I have now changed oil putting much thinner oil in it. The gauge still goes over to the far end on cold start up but takes shorter time to come back to the middle. A mystery to me.
Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!
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jvin248 View Drop Down
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Points: 322 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jvin248 Quote  Post ReplyReply Direct Link To This Post Posted: 17 Oct 2024 at 9:26pm
.

Gauges fail. Verify and if bad then replace it.

.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 81282 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 17 Oct 2024 at 9:49pm
does the "Rebuilt" motor use the old BYPASS jar lip thread filter.... or the PH8 type automotive full flow filter ??
Like them all, but love the "B"s.
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DrAllis View Drop Down
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Points: 20528 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 17 Oct 2024 at 10:56pm
Remove the filter base tube and clean it out by ramming a piece of wire down thru it and blowing air into it. 
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StanGreen View Drop Down
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Points: 50 		Post Options Post Options   Thanks (0) Thanks(0)   Quote StanGreen Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 2024 at 4:57pm
I just so happened to have a brand new oil pressure gauge, so I install the new one. It did not change anything. My pressure is still on the very high side. The temp here is in the mid-60s so I would not expect the oil to be thick. I also ran the tractor for a few minutes before changing the gauge. 

Any more thoughts?
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DrAllis View Drop Down
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Points: 20528 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 2024 at 5:41pm
Well, you haven't said how much pressure you have !!!     80 psi?? 100 psi??? or 30 psi ???
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steve(ill) View Drop Down
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Points: 81282 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 2024 at 6:41pm
Mid range on the gauge is about 15 psi... The "HIGH" side might be 25 psi (???)  .... not much to worry about, but good idea to figure out WHY ?
Like them all, but love the "B"s.
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Alberta Phil View Drop Down
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Points: 3782 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Alberta Phil Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 2024 at 8:20pm
I have a WD with a WD45 engine and had the same problem on initial start-up.  It was the pressure relief valve that was stuck closed.  It is behind the large hex plug on the lower right side of the block, by the dipstick.  The hex plug has a spring that holds the flat faced piston over the oil hole in the gallery.  I had to tap mine a bit and finally pull it out with a strong magnet so I could clean it up and also the mating surface where it seals.  After that the indicated pressure runs close to the L in NORMAL on the gauge.
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StanGreen View Drop Down
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Points: 50 		Post Options Post Options   Thanks (0) Thanks(0)   Quote StanGreen Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 2024 at 10:05pm
The standard AC gauge does not show PSI, only "Normal". The specs say the gauge max is 30 PSI, so I assume that is what I am seeing.
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StanGreen View Drop Down
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Points: 50 		Post Options Post Options   Thanks (0) Thanks(0)   Quote StanGreen Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 2024 at 10:08pm
Originally posted by Alberta Phil Alberta Phil wrote:

pressure relief valve that was stuck closed.

Thanks, I will check that out.
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Phil48ACWC View Drop Down
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Points: 289 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil48ACWC Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct 2024 at 6:55am
I run a 0-60 PSI gage on my freshly rebuilt WC with 10W-40 Full Synthetic oil and hold 32 PSI fully warmed up with a 180 degree thermostat while mowing in the Summer. It will hold closer to 35 PSI in Winter while plowing snow. Install a real pressure gage and don't worry about it. Below is similar to the gage I'm using:
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Eric B View Drop Down
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Points: 946 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Eric B Quote  Post ReplyReply Direct Link To This Post Posted: 23 Nov 2024 at 8:41pm
Stan Green: I'm wondering if you got your oil pressure issue resolved? As you may have read my input further back in this thread about my start up pressure being 90 psi and still quite high at operating temperature. Yesterday I removed the access cap to the pressure relief valve to discover that the plunger was seriously stuck in the fully closed position. The engine had been inactive over a couple of decades and with enough sludge etc hardening in there the relief plunger was non-functioning. It is no easy task to get it out being as stuck as it was, I will spare the details for another time. Once I had it all cleaned up and put back together the oil pressure was perfect like any 201 cu. in. should be.
My thanks to Alberta Phil for sharing that this had been an issue for him in the past as well.
Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!
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StanGreen View Drop Down
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Originally posted by Eric B Eric B wrote:

Stan Green: I'm wondering if you got your oil pressure issue resolved?


Thanks Eric. No, I have not tried cleaning out the relief valve yet. The old girl is in storage for the winter. This is on my list of projects for the spring. Smile
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