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Earthing the Engine

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NK1 View Drop Down
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    Posted: 30 June 2020 at 14:39
Hi. Have a 311 with Volvo Penta MD2020 and saildrive. Should the engine block be earthed and if so where should the earth be? Thanks.
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StavrosNZ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote StavrosNZ Quote  Post ReplyReply Direct Link To This Post Posted: 01 July 2020 at 21:44
The engine is connected to the 12v DC negative buzz bar via large black cables, you will probably find your main negative buzz bar is connected to the 230v AC earth buzz bar with a large cable link if you look so in effect your engine is earthed when on shore power.

You dont want the engine connected to the ocean and Volvo go to great lengths to ensure this doesn't happen by having isolator between the saildrive and engine and nothing else with direct pathway to the sea otherwise you would suffer accelerated corrosion, electrolysis etc. 
Stephen
2010 H400 #691, Auckland, New Zealand
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NK1 Quote  Post ReplyReply Direct Link To This Post Posted: 02 July 2020 at 00:05
 Thanks Stavros,
I don’t see an AC earth onto my 12v negative. Would this be an issue?  Should I connect one ? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote StavrosNZ Quote  Post ReplyReply Direct Link To This Post Posted: 02 July 2020 at 00:50
It will be in the form of a short cable connecting the 2 buzz bars (see photo) if its not there dont panic, your AC is earthed back to the pier and the engine in isolation is exactly whats needed.


so i think you are fine.
Stephen
2010 H400 #691, Auckland, New Zealand
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samuel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 02 July 2020 at 08:09
Originally posted by StavrosNZ StavrosNZ wrote:

You dont want the engine connected to the ocean and Volvo go to great lengths to ensure this doesn't happen by having isolator between the saildrive and engine and nothing else with direct pathway to the sea otherwise you would suffer accelerated corrosion, electrolysis etc. 


Perhaps you could explain how they do this please.
On my saildrive the bolts holding it in place go into the engine block (2020MD). The back of the saildrive ( 120s) meets up against the engine. The drive shaft goes into the gears of the engine & saildrive. So at the separation point they are both linked
Further down the saildrive where it is separated to fit the seal it is still a continuous section because the bolts hold it all together & the shaft passes right through
At the prop I was told that the bronze prop was isolated by a rubber bush, but this is byepassed by the rope cutter.
On a seperate matter,  I do have a galvanic isolator in the shore power instalation
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NK1 Quote  Post ReplyReply Direct Link To This Post Posted: 02 July 2020 at 10:00
Hi Samuel. Do you have an AC earth on your engine on the Hanse 312 and what point is it connected to? Thanks 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 02 July 2020 at 11:11
As far as I am aware the Negative just feeds the batteries.
I did take an earth wire from the engine to the Galvanic isolator though. I bolted it to the gear selector arm on the top of the sail drive. This effectively connects to the engine because the saildrive is not isolated from the MD 2020. The other end is connected to the shore power consumer unit that i fitted.

Even if it were a saildrive separation, I imagine that an electrical circuit would go from the throttle cable on the engine, to the cockpit control & back to the gear control on the saildrive. hence there would be a circuit. Albeit very minor


Edited by samuel - 02 July 2020 at 12:09
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NK1 Quote  Post ReplyReply Direct Link To This Post Posted: 02 July 2020 at 11:32
Hi Samuel. It was my understanding that the saildrive is isolated from the engine and must not be earthed. Think you can check if it’s isolated by going across the engine and saildrive with a multimeter checking resistance.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samuel Quote  Post ReplyReply Direct Link To This Post Posted: 02 July 2020 at 12:07
Well, can you explain how it is isolated please? Then I will have egg on my face & stand corrected.

I might point out that I have, so far, removed it twice to replace the seal & not seen any evidence of isolation
I have just phoned another owner & his is not isolated either
My saildrive is a 120 & my friend suggested that later versions may have changed. That may explain the confusion


Edited by samuel - 02 July 2020 at 12:10
Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NK1 Quote  Post ReplyReply Direct Link To This Post Posted: 02 July 2020 at 13:40
Hi Samuel. I found some information on this here.

https://forums.ybw.com/index.php?threads/volvo-penta-saildrive-isolation-how.343853/


Would you have any info on your galvanic isolator you installed? Thanks.

Regards Neil 

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