Need major help!!! Oil pressure drop on acceleration - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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Old 08-10-2019, 03:14 PM Thread Starter
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Angry Need major help!!! Oil pressure drop on acceleration

I have a 2009 StreetGlide with a 103ci on it. A couple of months ago I noticed my oil pressure gauge acting funny. Sitting in neutral and revving the bike the oil pressure goes up and down as normal, and cruising down the road it's steady as normal, but when I get on it and ride under acceleration (slow or fast) the oil pressure consistently goes down until about midways through acceleration and then it goes back up to normal. Almost as if the oil was pushed to the back of the pan on acceleration away from the sump, but as I understand the baffle and sump design that's considered to be impossible. Before making any suggestions here is a list of things I've done and tried.

New SE billet cam plate and HO oil pump assy.
Oil change with new HD filter and Mobil 1 V-twin that I've run since I bought the bike
New sending unit
Manual oil pressure gauge installed directly at the sending unit port

All my local sources and mechanics are stumped. I've taken all the possibility of electrical out of the equation with the manual gauge so it's got to be mechanical.

I've seen experiences with this from searching and researching, but it always turned out to be a gauge, sending unit, or pressure relief valve. And I've never found an occurrance of it happening under acceleration like this one.

It all of a sudden started happening so it's a new problem. I'm running out of ideas. Any help would def be appreciated.

And NO it's not making any abnormal "no oil pressure" noises.

Thanks in advance.
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Old 08-12-2019, 04:14 PM
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I'd bet the oil plunger is sticking, or has a piece of crap in it.
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Old 09-23-2019, 08:54 PM Thread Starter
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Well guys here it is. I still don't believe it, but here was the fix. The previous mechanic's helper that installed the new motor on it pulled the pan to clean the trash on it (which was great btw), but upon reinstallation he used a 93-99 Evo gasket on the pan instead of the correct twin cam gasket. Refer to the pics and you'll see the absence of gasket around the pickup hole that mates to the trans. Essentially like drinking through a straw with a crack in it. I'm really surprised it had as good of oil pressure as it did and didn't eat or burn anything up. It's all back together and running great. At least I learned a lot about maintenance, repair, and assembly on my bike for future cases. Thanks again guys for all the input. Classic example of human error strikes again. For reference the correct gasket is on the left and incorrect on the right and the pics are of the pan as it came off the bike.
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Old 09-24-2019, 06:51 AM
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Well ain't that a b!tch. Glad you figured it out.

And thanks for updating us.

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