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Blocked sea water intake for VP sail drive

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mattplowman View Drop Down
Commander
Commander


Joined: 05 December 2017
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Points: 123
Post Options Post Options   Thanks (0) Thanks(0)   Quote mattplowman Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2019 at 19:36
I have managed to fix the issue , partially by using the dinghy pump to clear the blockage enough to get us home and then last night I used the hose at the marina to force water back through the seacock , ran it for about 30 sec and it has completely cleared the blockage , we are back to peak exhaust flow.
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Fifth baby View Drop Down
Sub Lieutenant
Sub Lieutenant


Joined: 08 April 2015
Location: Spikkestad, Nor
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fifth baby Quote  Post ReplyReply Direct Link To This Post Posted: 13 March 2019 at 15:12
I have read this thread with great interest.  I have had a challenge for some time with, in my opinion to low flow of cooling water through the VP saildrive.  I have experienced air bubbles in the hose after the seawater filter.  I fear that there is a blockage in the SD that creates too high vacuum/underpressure resulting in air being sucked in through hose connections on the seawater filter.  There are no air in the hose from SD to the filter.  For at least two occasions I have completely lost cooling after several hours of sailing.  I have now purchased parts for installing an extra seawater inlet, but struggle a bit to find a suitable place for installing the valve.  I have a Hanse 385 with D1-30 engine.
I will try the tip with the dingy pump and run pressurized freshwater down in the SD before I make a new hole through the hull
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Interlude View Drop Down
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Joined: 25 June 2005
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Interlude Quote  Post ReplyReply Direct Link To This Post Posted: 05 May 2019 at 07:31
I recently lost seawater flow, we were alerted by a thermistor sensor on the exhaust elbow.  After much searching, it turned out to be air entering the system, apparently through the 10 turn seacock on the starboard side of the SD20 sail drive - suspected worn O ring - suspicion verified by smearing some vaseline over the rotating part of the seacock and turning it in 2 full turns, thus providing a temporary seal.

Have now replaced the fiddly 10 turn seacock with a "quarter turn" ball cock.  And replaced the hoses between the seacock and strainer, and strainer to seawater pump.  So far - so good.  There is a related string in the 320 forum.
Interlude 342#241
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Fifth baby View Drop Down
Sub Lieutenant
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Joined: 08 April 2015
Location: Spikkestad, Nor
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fifth baby Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2019 at 09:20
When having the boat out of the water I did a thorough cleaning of the seawater channels in the saildrive.  Had 30 % apple vinegar standing in the saildrive for about 24 hours. Used pressurized freshwater from the inside and out.  The saildrive was totally cleaned.  I had special attention to the vertical inlet on the bottom/underside of the saildrive.  This is a rather big opening and I guess approx. 10-15 % of the seawater will flow through this opening.
When I put the boat back in the water, I could see some improvement but still air bubbles and too low flow.
I then decided to change out the impeller.  This was stuck pretty hard but finally removed. It seemed to be not especially worn out or damaged but it was clear that this was not a genuine VP impeller.
 
I then installed a new impeller from Volvo Penta and guess what - the air bubbles are gone, the rumbling V8 sound from the exhaust is gone and the cooling water is flowing like it should.
Lesson learned:  Go for the cheap and perhaps obvious things first and use genuine VP parts.
I have heard that oil and fuel filters also are a bit tickly on the D2-30 and MD2030.
Hanse 385, #151, 2013 Mod. "Rett Fram", Oslo, Norway
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