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  1. #1
    Join Date
    Jul 2019
    Posts
    3

    Unhappy Help with Volvo Penta AQ205A Petrol V6

    Hello all,
    Been reading for a wee while but two weeks ago bought a boat, its an older one, its a Cruiser International 224 Holiday ( approx. 30yr old ) with a Volvo Penta AQ205A petrol v6 3lt only been out a few very short trips in and out the harbour until today, when after approx. 45mins the revs dropped slightly, the engine stuttered and the oil pressure dropped from approx. 50psi to 20psi or thats what it said , the engine had been starting and and running fine up until then, had it up to nearly 20knots for a short period but sitting nice at 10-13knots ( we had a nice flat calm in Ayrshire today ). I dropped down to about 2,000 revs and 5-6knots and pottered back in to the marina, didn't wanto push it too hard. Then the oil pressure dropped to about 10 well that's what the gauge said as I slowed right down for berthing. Once stopped & tied up, I tried to restart the engine in neutral but wouldn't. Left is half an hour and started fine, but oil pressure only went to 20 but did rise to 40'ish when rev'd. I think I'll need to get somebody to look at it, but just wondered if anybody by chance had same/similar boat/engine combination or if anybody has had any similar things happen and could provide any suggestions that I could look at or try myself before calling in the pros. There is plenty oil and I've already cleaned out the metal gause filter previously as it was pretty grotty.
    Thanks for looking and any suggestions,
    Regards.
    Gordon.

  2. #2
    Join Date
    Mar 2016
    Posts
    993

    Default Re: Help with Volvo Penta AQ205A Petrol V6

    Hi there.
    Very familiar with this aq205 and 290 combination. Had one in a sealine 218 for years and currently service a friends.
    You didnít have me too concerned up until you said it cut out. The old vdo gauges on these (likely about 89/90) are now really terrible for accuracy. But the fact that itís cut out is a concern.
    These 4.3 (not 3.0) V6 GM engines are in my opinion likely about the best engine ever put in a boat. They rarely go wrong apart from co sumable items like risers and manifolds. For your oil pressure to actually drop right off Iíd be suspecting perhaps water ingress by means of rotten risers or exhausts (as above). Usually told by a slow or cutting out tick over speed and moisture on the plugs after inspection. In the case of this gone unnoticed, then symptoms like yours would be a sign. Water thins the oil and oil pressure drops off. Your idle pressure should be around the 40 psi mark all being healthy and t stat working.
    Iíd also ask what oil you have in her. Should be a good mineral 15w40. But I suspect your issue is likely related to what Iíve said above. Have a look at the oil and plugs for water. Most common issue these see. About the only issue really.
    If the above is correct, all is not lost. These engines are that strong, Iíve often seen the sump riddled with water and run for hours and hours in such a state...then oil changed. New oil...ran for a while to flush...more oil and filter. All good.

  3. #3
    Join Date
    Jul 2019
    Posts
    3

    Default Re: Help with Volvo Penta AQ205A Petrol V6

    Excellent, thanks for the input, I'll check that out hopefully this weekend or early next week.
    Not added any oil myself, so not sure whats in it, but there is no sludge on dipstick or oil cap.

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