 O-ring oil pump, Picture needed |
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| Chad911sc |
 Sep 26 2025, 01:28 PM
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Member  Group: Members Posts: 188 Joined: 24-September 24 From: Florida Member No.: 28,374 Region Association: South East States  |
So on my new 2056 I have been getting low oil pressure numbers after the oil gets hot. I have 85 lbs at start up, but after it gets to 220, I’m only getting 5lbs at idle and 45lbs at rev to around 5grand. I do have an external filter/fan combo that could be contributing to my issue. After it gets past 190 the valve opens up and lets the hot oil into the external fan cooler combo. I changed out the 26mm oil pump to the 30mm offered on LN engineering, but still same problem. The reason I ask about O-ringing my pump is because when I changed out the pump to the bigger one, I noticed that my case was gouged in 2 places where the pump press fits into the case. I’m thinking that this could be my culprit. That the oil is just pushing back into the sump from those digs in the case halves. I also ordered the piece from Tangerine racing to replace my oil valve spring inside the case, as I still am using the stock spring as of now. I’m going to pull the pump back out of the case this weekend and I will post a couple pics of the gouges in the case.
I was wanting to know exactly where this o-ring would go on the pump, so I can take it to my machine shop and have a grove beveled into it. One more thing out of the equation to solve this problem. |
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Replies
| Geezer914 |
Sep 27 2025, 08:29 AM
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Geezer914 Group: Members Posts: 2,082 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States 
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I have a 26 mm pump from CB performance. 80 lbs.cold and 40 lbs. at 190° , 3500 rpm cruising speed. External oil cooler opens at 180°.
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Posts in this topic
Chad911sc O-ring oil pump Sep 26 2025, 01:28 PM
cgnj I'm going to pm you about this. Sep 26 2025, 02:55 PM JamesM 1. Which 30mm pump?
2. Were the clearances in spe... Sep 26 2025, 04:35 PM Superhawk996 All T1 pump bodies are undersized vs proper T4 pum... Sep 26 2025, 08:34 PM Chad911sc Yes I ordered the Tangerine racing oil relief valv... Sep 27 2025, 06:15 AM
cgnj @Geezer914 Did the CB pump require any prep work ... Sep 27 2025, 10:35 AM Chad911sc That’s what I had in my engine when I built it, ... Sep 27 2025, 11:59 AM Superhawk996
Obviously that wasn’t the problem because the 3... Sep 27 2025, 02:42 PM Chad911sc You are correct as usual!
At the time when I ... Sep 27 2025, 03:03 PM Jack Standz
The pump had a pretty good leak from the gasket b... Sep 27 2025, 04:56 PM cgnj I have a single o ring pump waiting to be autopsie... Sep 27 2025, 05:18 PM |
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