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  #21  
Old 08-06-2014
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Re: Volvo Penta MD6b Cold Start System

Ok next cold start I will pump the lift pump and use full throttle and see what we get. It was last run on Sunday evening, it maybe tonight I will get down to the marina.
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  #22  
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Re: Volvo Penta MD6b Cold Start System

Also, I looked in all the manuals and can find no description of what the cold start system does. Does it allow the pump to pump more fuel ? does it change the timing of the injection ? My engine has an automatic cold start , I have learned that the cold start system is "set" when the fuel is shut off . I need to determine what it is supposed to be doing and whether or not my engine is doing it , but can find no description or diagrams or explanations of how it is supposed to work. Since my problems are limited to cold starts , I am sure that this is an area I need to fully understand.
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Old 08-06-2014
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Re: Volvo Penta MD6b Cold Start System

Please read carefully.
You are not pumping the lift pump. You are pulling out the engine stop control to the stop position and pushing it back in to the run position.
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Re: Volvo Penta MD6b Cold Start System

thank you Jim

I think I've got it right I'm pulling the fuel stop all the way out and letting it go back in.
I'm also pumping the lift pump just in case. I have the throttle all the way out to full throttle. The routine is it cranks about 5 seconds and nothing happens and then she will start to fire almost like one cylinder is firing. It cranks much faster when it starts to fire and I get some exhaust. After 5 to 10 seconds of that I stop cranking and wait 5 minutes. I have done this about 5 times so far.
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Old 08-07-2014
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Re: Volvo Penta MD6b Cold Start System

Within 5 - 10 secs. of turning over the motor should be running.
Jim
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Old 08-07-2014
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Re: Volvo Penta MD6b Cold Start System

many diesels are like this...yanmar also specifies full throttle cold starts on many of its engines...
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Old 08-09-2014
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Re: Volvo Penta MD6b Cold Start System

yes she is really dead. I am sure the compression is not enough .
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Old 08-10-2014
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Re: Volvo Penta MD6b Cold Start System

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Originally Posted by ScottSS View Post
yes she is really dead. I am sure the compression is not enough .
That might still be fixable in-situ, Scott. First thing to do in that case would be to pull the injectors, check them and do a full and accurate compression test on each cylinder - since it still could be only one cylinder with a problem.

You'll need a trusted mechanic to take you through this - and before agreeing to anything major, don't be afraid to get a second opinion.
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  #29  
Old 08-11-2014
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Re: Volvo Penta MD6b Cold Start System

Well the mystery deepens- the starter began to crank slowly and then would not turn the engine any more. I started tracing wires and felt that I had a good 12V to the solenoid so i was thinking the supply to the starter motor itself was not good- Just to check I removed the starter and took it to a shop that could test it - where it was given a clean bill of health.

I was able to determine that the crimped connection on the 12V to the solenoid was not secure. It would read continuity but with motor movement and vibration it must be intermittent. I pulled it off and soldered it. I also put the original ( now rebuilt) starter on the boat ( rebuilt by Buckeye Auto Electric in Painesville, Ohio - highly recommend for old vintage stuff like this MD6B) .

I turned the key and the motor started immediately, without hesitation. Cranked less than 2 seconds. This was after not running for a week. I started it and stopped it 10 times yesterday and motored around the river and harbor here for 4 hours, and it ran beautifully- idled down , shifted gears, up to 1500 rpm, 700 rpm idle etc. etc.. Too bad it was too windy to do any sailing. Good news was we explored up river where I had never been before because I assumed it was too shallow but we had 12-13 feet of depth all the way to an old railroad bridge and found a marina full of sailboats - !

I know the engine is old and tired- but I am at a loss as to why this wire connection would prevent it from starting except it is possible it simply turned the engine too slowly to fire.

I also changed out the oil ( still cleaning it up from the leaky lift pump diaphragm)-and added some goop from Rislone that is intended to help the rings seal .Probably only going to make me feel better but it may help a little .
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Re: Volvo Penta MD6b Cold Start System

I should add that I also took the rocker arm cover off and checked the valves cold- I could verify they were closing fully and had some clearance , but the only lash specifications I could find were for a hot engine. I could see how the de-compressor worked and made sure it was fully disengaged as well. Still back to the original question- what does the "cold start" system do ? and how does it do it ?
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