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charentebob
Commadore Joined: 09 April 2014 Status: Offline Points: 403 |
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Roger
You say your emergency starter switch was an old heavy duty auto switch. Does it need to be heavy duty or was it just a switch you had? Nigel (unlucky Captain) |
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High Time
Vice Admiral Joined: 04 September 2012 Location: Portsmouth UK Status: Offline Points: 798 |
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Hi Nigel
If you try jump starting the engine by shorting the terminals under the MDI (using a screwdriver or jump lead) you will see a significant spark. Although the starter solenoid does not take a large current in steady state it is an inductive load that resists changes in current causing the high voltage sparks. For this reason you need a heavy duty switch otherwise the sparking will burn out the contacts.
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Roger
High Time (415 #038) |
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415 Singapore
Vice Admiral Joined: 23 September 2013 Location: Singapore Status: Offline Points: 826 |
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Hi Roger
We are finally going to get round to fitting your suggested over ride for the MDI unit, as our second one failed last weekend. Fortunately I had a spare on board and we weren't in any imminent danger, so no harm done. Not being an electrician, can you confirm if this acts as a starter over ride or merely by passes the MDI unit, i.e. should it be a push button or a switch? I have asked for replacement from Volvo but am not sure how much warranty they give on these units as they seem very fragile! Thanks for your help All the best Paul
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Paul - Night Train - 415 #136
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samuel
Admiral of the Fleet Joined: 26 December 2004 Location: United Kingdom Status: Offline Points: 2681 |
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Forgive me jumping in here but surely if one wanted to do a bye pass system one would pass the engine electrics complete & have the wires go to earth & to the back of the starter. As i see it the system shown seems to go through the starter relays etc.( have I read that correctly?) Although I have , so far, avoided lightening strikes, I have had both the glow relay & the starter relays fail in the past so that would not have worked for me.
Also I cannot help wondering how a single switch system deals with the glow plugs. On my ( admittedly much smaller engine) I would put the end of the jump lead on earth then the other end on the glow plugs for 10 second then on the back of the starter & keep my finger crossed Do the larger engines have glow plugs? Have you actually tried this system with the starter relays removed to show what would actually happen in the event of a failure of the primary electrics & have you actually tried starting from cold without any glow plug heating?( assuming you have them) |
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Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex
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High Time
Vice Admiral Joined: 04 September 2012 Location: Portsmouth UK Status: Offline Points: 798 |
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Paul (and Samuel)
A push button is needed. The 2 connections made on the underside of the MDI to the push button are battery plus and the starter solenoid. Pushing the button connects battery plus to the starter solenoid and hence operates the starter for the duration of the push. For Samuel's benefit - the solenoid is an integral part of the starter and not to be confused with the starter relay that is inside the MDI. The suggested system completely bypasses the internals of the MDI (electronics and relays etc). It just uses the easily accessible connections on the underside. Any other connection to the starter/solenoid would be more difficult. There are glowplugs on the D2-40 but they are not essential. On the coldest UK morning (-4C) I can still start mine without activating the glowplugs - it just takes 3 or 4 seconds instead of 1 or 2 seconds if the glowplugs are used first. I rarely bother with them on 'normal' UK sailing days (+5C or above). |
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Roger
High Time (415 #038) |
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Fendant
Admiral Joined: 03 November 2012 Location: Switzerland Status: Offline Points: 1617 |
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Roger, how do you kill the engine without the MDI ?
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Frank
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415 Singapore
Vice Admiral Joined: 23 September 2013 Location: Singapore Status: Offline Points: 826 |
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Hi Roger
Thanks for that, I sort of guessed it, but as the thread got longer there was more and more talk about switches, so just wanted to make sure! thanks again for your speedy reply All the best Paul
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Paul - Night Train - 415 #136
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High Time
Vice Admiral Joined: 04 September 2012 Location: Portsmouth UK Status: Offline Points: 798 |
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Hi There's a small lever on the end of the injection pump marked STOP that you can use - see photo below. I assume it is the same on all D2-xx engines? |
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Roger
High Time (415 #038) |
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Richard Hall
Sub Lieutenant Joined: 02 January 2018 Location: Malta Status: Offline Points: 7 |
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Hi All, Thanks to Roger for series of helpful posts. I have just joined the club of MDI/Tachometer failures on my 455. Having talked to a technician the primary failure is apparently as most have discovered is a power spike, which causes various different failures either in starting or malfunction of another unit, in my case the tachometer needle gauge (the LCD is fine). However, I can still start and stop the engine from the button panel although I successfully started by shorting the cables with screw driver (I figured it was good practice to try) and can state the spark is significant (tricky but not impossible). The MDI unit has been a known problem for sometime and there are no less than 5 replacement units all superseding one another on the Volvo parts website so they are alive to the issue. Apparently, I'm told the latest version has "P" symbol on the unit and this indicates that it should have been hardened against electrical spikes. This hopefully should fix the problem. Given the known issues with the unit I fully expect Volvo to provide the replacement parts regardless of wrranty - especially given the relatively benign operating conditions the unit resides in - most car ECUs have far harsher operating conditions and ranges and yet survive for 20+ years vs the 170 hours (that's equivalent to a failure every 6,000 miles of motoring). The ultimate though being the Continental IO550 on the plane, which operates through a huge environmental range. I would hate to think what it would be like if the electrics on that failed every 170 hours! As to the hot water tank I seem to remember lowering the temperature largely solves the issue (unless you are prone to particularly hot showers), it certainly stopped the pump activating every 40 minutes or so and there is much less moisture in the oil catchment area. Happy New Year, Richard
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415 Singapore
Vice Admiral Joined: 23 September 2013 Location: Singapore Status: Offline Points: 826 |
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Hi All, Volvo have eventually replaced our MDI unit and as Richard says the new ones have a "P"in the serial number so hopefully this one will last longer than the previous three!
Happy new year to all |
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Paul - Night Train - 415 #136
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