rawsondsr Posted September 5, 2019 Report Share Posted September 5, 2019 A new issue appeared with the oil pressure on my beta 43 with a shade under 5000 hours. When cold, i have good oil pressure at idle and cruising rpms, circa 50psi, however, when warm at below about 1200rpm, down to idle i have (apparently) zero oil pressure. I have changed the oil and filter about 50 hours early, with 15/40 mineral, and a beta filter incase the old filter was blocked, or the oil had thinned out due to diesel in the oil or something, but it made no difference, as soon as the new oil had warmed up, pressure vanished at low rpm. I assume the pump is ok, as i would expect it to worse with cold thick oil, engine temp is normal, oil level was normal before i changed the oil, and is still normal, could the gauge be lying to me? has anyone had this issue? Link to comment Share on other sites More sharing options...
Boater Sam Posted September 5, 2019 Report Share Posted September 5, 2019 Yes it could especially if it is the electric type not capillary. Just hope it is! Else the engine is chips. If its electric try changing the sender unit in the block first. Link to comment Share on other sites More sharing options...
dmr Posted September 5, 2019 Report Share Posted September 5, 2019 Does the gauge drop slowly or go down suddenly? Does the engine sound like its got a bag of nails in it? ............Dave Link to comment Share on other sites More sharing options...
Chewbacka Posted September 5, 2019 Report Share Posted September 5, 2019 13 minutes ago, dmr said: Does the gauge drop slowly or go down suddenly? Does the engine sound like its got a bag of nails in it? ............Dave My sons old car was like that, engine worn so clearance is a bit big, then as the oil gets hot it thins and flows faster than the pump can supply at low revs. If you are lucky it may just need a new oil pump. Link to comment Share on other sites More sharing options...
BWM Posted September 5, 2019 Report Share Posted September 5, 2019 Oil pump would be the first thing i would suspect, if worn, the thicker, cold oil would compensate for the wear. Link to comment Share on other sites More sharing options...
Tony Brooks Posted September 5, 2019 Report Share Posted September 5, 2019 I am with Sam, electric sender units are not the most reliable, acceleratingly get the oil pressure checked with a mechanical gauge before you go thinking about oil pumps. Any half decent boat mechanic should have such a thing and know how to use it. Link to comment Share on other sites More sharing options...
Sir Nibble Posted September 5, 2019 Report Share Posted September 5, 2019 I would look at the release valve and strainer before the pump but I agree the problem is probably instrumentation. Link to comment Share on other sites More sharing options...
Guest Posted September 5, 2019 Report Share Posted September 5, 2019 Admittedly an Isuzu engine not a Beta, but a guy we helped out a few months back had the similar problem. The RCR guy fitted a new sender and hey presto cured. He said he changes them frequently (not sure if that was just Isuzu or all engines.) Link to comment Share on other sites More sharing options...
rawsondsr Posted September 9, 2019 Author Report Share Posted September 9, 2019 Turns out the wire on the sender was loose, which is why at idle when the engine vibrates more the connection was dodgy, nipped it up again and all is good thankfully! Why it only did it when hot i don't know, it only happened after 30 mins of running. Thanks all. 1 Link to comment Share on other sites More sharing options...
Guest Posted September 9, 2019 Report Share Posted September 9, 2019 35 minutes ago, rawsondsr said: Turns out the wire on the sender was loose, which is why at idle when the engine vibrates more the connection was dodgy, nipped it up again and all is good thankfully! Why it only did it when hot i don't know, it only happened after 30 mins of running. Thanks all. Great result! Always good to hear the outcome as others can benefit. Link to comment Share on other sites More sharing options...
bizzard Posted September 9, 2019 Report Share Posted September 9, 2019 46 minutes ago, rawsondsr said: Turns out the wire on the sender was loose, which is why at idle when the engine vibrates more the connection was dodgy, nipped it up again and all is good thankfully! Why it only did it when hot i don't know, it only happened after 30 mins of running. Thanks all. It probably did it because the engine heat opened the female connector up a bit causing it to be loooooser. Link to comment Share on other sites More sharing options...
blackrose Posted September 9, 2019 Report Share Posted September 9, 2019 1 hour ago, rawsondsr said: Turns out the wire on the sender was loose, which is why at idle when the engine vibrates more the connection was dodgy, nipped it up again and all is good thankfully! Why it only did it when hot i don't know, it only happened after 30 mins of running. Oil pressure is reduced as oil gets hot due to decreased viscosity, so perhaps it was a combination of that and your loose sender wire? Link to comment Share on other sites More sharing options...
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