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StanGreen 
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Joined: 13 Nov 2022
Location: US
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 Topic: WD45 - Very High Oil Pressure
Posted: 17 Oct 2024 at 8:52pm |
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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)
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Joined: 11 Sep 2009
Location: illinois
Points: 81238
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Posted: 17 Oct 2024 at 9:00pm |
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get a good gauge and read the REAL pressure..
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Like them all, but love the "B"s.
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Eric B
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Joined: 09 Feb 2012
Location: British Columbi
Points: 945
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Posted: 17 Oct 2024 at 9:12pm |
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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.
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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
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Joined: 17 Jan 2022
Location: Detroit
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Posted: 17 Oct 2024 at 9:26pm |
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Gauges fail. Verify and if bad then replace it.
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steve(ill)
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Location: illinois
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Posted: 17 Oct 2024 at 9:49pm |
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does the "Rebuilt" motor use the old BYPASS jar lip thread filter.... or the PH8 type automotive full flow filter ??
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Like them all, but love the "B"s.
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DrAllis
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Joined: 12 Sep 2009
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Posted: 17 Oct 2024 at 10:56pm |
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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
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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
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Posted: 18 Oct 2024 at 5:41pm |
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Well, you haven't said how much pressure you have !!! 80 psi?? 100 psi??? or 30 psi ???
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steve(ill)
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Posted: 18 Oct 2024 at 6:41pm |
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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 ?
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Like them all, but love the "B"s.
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Alberta Phil
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Joined: 13 Sep 2009
Location: Alberta, Canada
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Posted: 18 Oct 2024 at 8:20pm |
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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
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Posted: 18 Oct 2024 at 10:05pm |
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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
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Posted: 18 Oct 2024 at 10:08pm |
 Alberta Phil wrote:
pressure relief valve that was stuck closed.
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Thanks, I will check that out.
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Phil48ACWC
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Joined: 17 Jan 2013
Location: Vermont
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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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