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  1. #1
    Join Date
    Apr 2006
    Posts
    78

    Default Volvo QL300 bow thruster oil

    Anyone changed the oil in their volvo QL bow thruster in recent years?

    These trusters are very old, long discontinued, as is the recomended volvo bowthruster oil. Is it safe to use Ventus "special gearbox oil VBT05" instead?

    The Vetus one says spec is 80W-90 API GL-5

    While I remember seeing a Penta bulletin stating ISO 150 ?

    thanks

  2. #2
    Join Date
    Nov 2009
    Posts
    102

    Default Re: Volvo QL300 bow thruster oil

    Hi ajay - yes, the VP supplied oil is now obsolete, and the bulletin you refer to does recommend SP 150 Oil.jpg

    EDIT - hopefully you can enlarge that image to view it, but its a screenshot of the bulletin confirming 0.2L of 'Castrol Alpha SP 150'

  3. #3
    Join Date
    Apr 2006
    Posts
    78

    Default Re: Volvo QL300 bow thruster oil

    Thanks Andy, when I search for "Castrol Alpha SP 150" it seems only available in very large volumes. So was wondering from experience if anyone knows where to by 1/2 or 1/4 litre and ideally a link where I can buy small amounts.

  4. #4
    Join Date
    Feb 2008
    Location
    Farndon
    Posts
    3,134

    Default Re: Volvo QL300 bow thruster oil

    Is this the appropriate grade of oil?
    https://www.withamgroup.co.uk/shop/i...r-oils/mep150/
    .

  5. #5
    Join Date
    Apr 2006
    Posts
    78

    Default Re: Volvo QL300 bow thruster oil

    Not sure if viscosity of 150 the only requirement?

    If I look up the recomended replacement Castrol Alpha SP 15 the specs are here ...

    https://msdspds.castrol.com/bpglis/F...SP%20range.pdf

    but I don't understand how to translate these specs to the metrics used by other oils, eg is this equivalent ...

    https://www.vetus-shop.com/vetus-spe...re-p-2241.html

    or this ...

    https://www.force4.co.uk/quicksilver...SABEgKU0vD_BwE

    or this ...

    https://www.force4.co.uk/quicksilver...iABEgJk0fD_BwE

    What are other owners with volvo QL thrusters actually using?

    Thanks

  6. #6
    Join Date
    Feb 2008
    Location
    Farndon
    Posts
    3,134

    Default Re: Volvo QL300 bow thruster oil

    Quote Originally Posted by ajay View Post

    What are other owners with volvo QL thrusters actually using?
    A small bottle of the QL branded stuff came with my boat. I used most of it for top up as I had a small leak which was cured by tightening the clip on the hose to the oil reservoir. Since then the oil level has been stable.
    I don't think it necessary to change the oil for such a little used item .

    Correct me if I am wrong but I think ISO 150 is a measure of viscosity .

  7. #7
    Join Date
    Apr 2006
    Posts
    78

    Default Re: Volvo QL300 bow thruster oil

    yep 150 is the viscosity

    funny mine also leaked very slowly at the bottle, so used to run down the pipe. Still donít think the bottle is very robust.

    on mine I donít believe the oil has ever been changed from new (~2007) iíve read several posts advising it makes sense to change every few years. I expect the oil in the thruster would be black and worth replacing. Itís always worth taking a look at the oil to know if water is getting in or excess metal wear etc. So with the boat out for winter think iíll have a look at the oil.

    eg

    https://youtu.be/43dVn2S0bV0
    Last edited by ajay; 25-01-19 at 19:01. Reason: adding link

  8. #8
    Join Date
    Feb 2008
    Location
    Farndon
    Posts
    3,134

    Default Re: Volvo QL300 bow thruster oil

    An interesting video. It does demonstrate the oil in the gearbox may be black while the oil in the reservoir looks clean. I am still not convinced a regular oil change is essential but the video has changed my thoughts . It seems an easy job to do so will have a go next time the boat is out.

    Perhaps it would be better to drain all the oil from the gearbox while adding fresh oil at the same time to prevent the oil level falling below the bottom of the reservoir . This would avoid the air in the pipe and avoid risk of an air pocket in the gearbox. Probably a two person job with one on the drain plug and the other keeping an eye on the oil level in the reservoir and adding oil as required.

  9. #9
    Join Date
    Apr 2006
    Posts
    78

    Default Re: Volvo QL300 bow thruster oil

    I took a few drops out from the leg and it was black which I would expect. As you say the clean oil in the pipe is misleading. A useful trick I used to get air bubbles out the pipe is to push a stiff thin bell wire through the bottom of the bottle into the pipe all the way to the gearbox then wiggle it. That encourages the air bubbles up the pipe as the oil is quite thick.

    Just need to choose which oil I'm going to fill it with,

  10. #10
    Join Date
    Apr 2006
    Posts
    78

    Default Re: Volvo QL300 bow thruster oil

    Changed the oil, was simple. Just for information the QL manual actually says change every season which I will do from now on.

    The gear box oil was black / old ....



    the oil in the canister will be clean so you could run the oil out the drain screw in the leg until it runs clear and top up in the canister. Or in my case since the reserve oil was many years (if not decades old) I replaced it all. The oil is soooo thick so trying to let it out the leg a drip at a time would have taken ages so I gave up and like the video sucked most the oil out the canister and the wide pipe to the thruster using a syringe and short hose...



    Getting the new oil to fill the leg and pipe without air locks with the new oil (which is also thick) was made a lot easier by putting a hairdryer in the thruster bilge for 20 mins to pre-warm up the whole system and the oil. It then ran out the drain plug nicely and no air bubbles ...


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