Bukh DV-8 vs DV-10 |
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khardy
Commodore Joined: 22 June 2004 Location: United States Status: Offline Points: 132 |
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Saltwater. I'm exploring the heat exchanger idea. You added this to your engine? What model / brand heat exchanger did you use? I'm looking into a double pocket pump to replace the Johnson raw water pump the engine came with. Johnson used to make one. Sherwood still makes double pocket pumps.
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frfletch
Commodore Joined: 13 May 2008 Location: Canada Status: Offline Points: 365 |
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Are you operating in salt water? If so I higher recommend installing a heat exchanger I have heard of people flushing with diluted acid lr vinegar this may clean up the thermostat but I don't think it it will resolve rust. You could try it on some other rusty piece of dteel in a bucket OT glsss container.
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khardy
Commodore Joined: 22 June 2004 Location: United States Status: Offline Points: 132 |
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I will try to get the S/N, but the sticker was painted over.
A related question - I've heard of some people running acid through their cooling system to remove scale and corrosion. I've used muriatic acid to clean a heat exchanger of and old Perkins. Has anybody ever done this on thier Bukh? |
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Bill Layton
Commodore Joined: 15 September 2002 Location: Canada Status: Offline Points: 551 |
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Get me the serial # and I may be able to tell you what it was adjusted for.
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khardy
Commodore Joined: 22 June 2004 Location: United States Status: Offline Points: 132 |
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That is correct. Not sure what it came out of.
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fatjohnz
Commodore Joined: 05 August 2006 Location: United States Status: Offline Points: 296 |
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Hi, Bill stated in his March 22 post, "All DV8's and DV10's installed in Laser 28's were adjusted to 10 HP at the BUKH factory..."
I assume from your question that the DV8 in question was not from a Laser? Just checking, john |
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frfletch
Commodore Joined: 13 May 2008 Location: Canada Status: Offline Points: 365 |
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The DV8 and the DV10 are the exact same engine. Basically we have a 10 hp engine, however back in the day there were different taxation points when importing engines into North America, so they renamed the engine a DV8 to avoid the problem. Same engine, different numerical designation. A workshop manual with either name on it will look exactly the same and all parts are the same.
There are minor differences between engines made to drive a straight prop shaft and those that are attached to a sail drive because one is mounted horizontally and the other is mounted vertically for the sail drive. l Ours is more of a diesel outboard mounted inboard. To accommodate the different orientation the treatment of crankcase oil circulation, draining and filling of the oil is configured to suit. |
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khardy
Commodore Joined: 22 June 2004 Location: United States Status: Offline Points: 132 |
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Back to the original topic. I have the DV8 which is to replace my old DV10. Bill says above that the difference is just a fuel setting. Can I adjust that setting to make my engine a DV10? I have a DV8 workshop manual which provides instructions on how to do it "if the factory testing bench is not avilable". But the manual only provides settings for the DV8.
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frfletch
Commodore Joined: 13 May 2008 Location: Canada Status: Offline Points: 365 |
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The engine was set up for raw water because its was designed for life-saving boats that launch from a ship in the case of having to abandon the ship. As such, they did not anticipate a lot of use for them. I have converted two of our Bukh's to cooling using a heat exchanger (avoiding sea water cooling) and that works just fine, despite that the workshop manual says it cannot be done. It can.
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John Mills
Commodore Joined: 01 February 2016 Status: Offline Points: 122 |
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Glad to hear the old engine lives to fight another day . Never understood why Bukh or anyone had a raw water cooled engine given most are in salt water . We are fresh water here lucky for us .
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Unplugged
# 164 NOTL |
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fatjohnz
Commodore Joined: 05 August 2006 Location: United States Status: Offline Points: 296 |
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The longer story is that my head failed and I took it to a local machine shop. After cleaning they found that the water jacket wall had thinned due to salt water corrosion and was compromised to leak into the exhaust port. Another local shop also told me that it could not be repaired.
Then I began my search for a salvage head or a salvage engine. Very hard to locate. Eventually I found an engine and swapped them out. In the mean time, Kieth from Crinmar had me send him the failed head. Lo and behold, a shop in Canada was able to repair the head. So as I put the repaired head back on the original engine, I find that some parts didn't survive all the change of hands. This past weekend, the motor was used for a diesel motor class at a Women's Conference held by our sailing club. I will order that banjo bolt though ($2.50 plus $40 shipping from Denmark). I would like to hear that repaired motor run again. John |
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fatjohnz
Commodore Joined: 05 August 2006 Location: United States Status: Offline Points: 296 |
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It all started when the head failed; and then ....
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John Mills
Commodore Joined: 01 February 2016 Status: Offline Points: 122 |
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How did you loose that ?
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Unplugged
# 164 NOTL |
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Bill Layton
Commodore Joined: 15 September 2002 Location: Canada Status: Offline Points: 551 |
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Thats a pretty rare part... either Keith Strutt or Bukh would have it. Or possibly a CAV shop who rebuilds injection pumps and injectors. It's a rather specialized part since it has a bleed screw on it as well.
Also this place as well may have it: http://www.lsm-diesel.dk/ Edited by Bill Layton - 24 March 2017 at 9:29am |
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fatjohnz
Commodore Joined: 05 August 2006 Location: United States Status: Offline Points: 296 |
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Hi , Trying this post again. Anyone happen to have a fuel bolt for the injector end of the fuel feed line?
Thanks, John |
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fatjohnz
Commodore Joined: 05 August 2006 Location: United States Status: Offline Points: 296 |
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Wow, that's interesting Bill.
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Bill Layton
Commodore Joined: 15 September 2002 Location: Canada Status: Offline Points: 551 |
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It's the same engine exactly. The only difference is that there is an essentric fuel flow adjustment screw that controls the amount of fuel the fuel injection pump receives. All DV8's and DV10's installed in Laser 28's were adjusted to 10 HP at the BUKH factory in Denmark. The reason for this was, back in the day when this engine was designed europe had a rule that stated marine engines 8hp or less didn't have to pay a special tax. When that rule was rescinded they turned it up to 10hp and put on a prop with a little more pitch.
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fatjohnz
Commodore Joined: 05 August 2006 Location: United States Status: Offline Points: 296 |
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I presume that the DV-10 is just a larger cylinder bore and piston. The DV-8 in my Laser had a head failure and I replaced it with a DV-10. Everything seems interchangeable.
The DV-10 seems to have a little more kick and is able to push the boat to speed at a slightly lower RPM... or I could be imagining things... or my DV-8 was just giving up the ghost and had to work harder. John |
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khardy
Commodore Joined: 22 June 2004 Location: United States Status: Offline Points: 132 |
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Does anybody know the difference between the DV-8 and a DV-10?
I've purchased a DV-8 in the UK and I'm going to have it refurbished before shipping it to the US and installing it. It is replacing a DV-10. |
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