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  #1   IP: 172.58.11.224
Old 01-17-2019, 06:40 PM
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Oil pressure goes down to nearly 0 when hot

Hey guys,

thanks for all the information in this forum, I learned a lot so far!
I bought a Helms 30 with an Atomic 4 in it about 2 weeks ago. The problem I have with it is that the oil pressure goes down to nearly 0 (under 10psi) when the engine is hot (it barely changes when changing the revs). The pressure is too low in forwars, neutral and reverse. The temperature goes up to 190 degrees, too. The oil pressure is good whe the engine is cold, though. I already changed the oil to SAE30 (I don‘t know which oil was in it as I bought it). The low oil pressure doesn‘t seem to affect the running performance. I tried to adjust the oil pressure screw, too, but it barely made any difference at all.
The next problem I have, but what I don‘t want to discuss right now (I only write this for your information or because these two problems might? correlate), is that the engine doesn‘t rev to more than 1200rpm in forward gear, neutral and reverse are good.

I‘m desperate right now and have no idea where this could come from.
Thanks for your help/rescue and br
Max
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  #2   IP: 137.200.0.112
Old 01-18-2019, 07:57 AM
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You have numerous issues going on.
First thing I would do is confirm the gauge reading to be accurate. Test with a mechanical gauge.
Second thing I would do is determine if the engine is RWC or FWC. 190 degrees is far too hot for raw water, minerals and salt will slowly clog all the cooling passages. If the engine is RWC that temp needs immediate attention.
Third thing I would do is see if the running gear is clean, 1200 RPM is barely off idle.
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  #3   IP: 172.58.172.76
Old 01-18-2019, 09:50 AM
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I don‘t have a mechanical gauge right now but I can get one at Pep Boys. Do you know where I can connect the mechanical gauge to?
The engine is FWC, so the temperature should be okay, I guess.
How can I see if the running gear is clean?

One more thing I forgot to mention: As the rpms go up (to 1200) the propshaft starts vibrating and making klacking noises (not too loud).

BR
Max

Last edited by spielzimmer300“; 01-18-2019 at 12:34 PM.
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  #4   IP: 137.200.0.112
Old 01-18-2019, 12:33 PM
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Second question first: You need to swim under there and look.
If you are in Maryland you won't be in the water for long!
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  #5   IP: 172.58.172.76
Old 01-18-2019, 01:12 PM
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I had a look at the prop right now and there were some very small barnacles but removing them didn‘t make any difference.
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  #6   IP: 76.7.129.62
Old 01-18-2019, 01:35 PM
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"the engine doesn‘t rev to more than 1200rpm in forward gear, neutral and reverse are good."

Can you give us some more info, RPM in neutral, in reverse? Is your A-4 a direct drive? What size prop are you using? A optical tach may help verify your tach readings.

If the oil pressure gauge proves to be correct I would try dressing the oil pressure adjustment. Not hard to do if you have access and know what to expect.

Dan
S/V Marian Claire

Last edited by Marian Claire; 01-18-2019 at 01:40 PM.
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