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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 10-20-2009
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Diesel foot massage

Hey,

are single lung dieasels (yanmar 12 HP) supposed to shake the cockpit like an earthquake upon start up? She idled smoother, but should I check the mounts? As well, can you do a compresion test on on of these- where do you screw in the tester ?

On a seperate note, what does " varied moisture readings in the deck and cockpit sole, with no evidence of delamination - used brass hammer " mean?

Thanks for the insights.
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Old 10-20-2009
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I think only 3 or more cylinders will run smooth. I've a 2 banger and it shakes at certain rpms.

survey says! you have moisture in your decks but, they are not delaminating yet. The brass hammmer gives a dull sound when the damp core is evident. a crisp rap or chirp means it's still solid.
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Old 10-20-2009
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Hi
Most one lunger diesels will shake a bit at certain rpm settings. Best to either speed up or slow down until it smoothes out a bit.
As far as the moisture readings Denise is right, but your surveyor should have explained this to you. Unless it's an old survey as opposed to one you commisioned yourself. Things can change over time so an old survey is really only a guide and you should get your own if looking to purchase. Is it an Ontario 28?
Hope this helps.
Brian
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Old 10-20-2009
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We looked at a Cal 26? or 27?, I forget which, that had a single cylinder Ferryman (sp?) diesel in it. We really liked the boat until he started it up. The vibration was so bad at idle that it was a deal breaker for us.
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Old 10-21-2009
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My current boat, a CS27 has a Yanmar YSE8 single cylinder 8hp and vibrates at some rpms which I avoid. In 1972 I had a Westerly 25 twin keel boat with a Volvo MD1. At idle the entire rig shook in that boat until the throttle was increased.
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Old 10-21-2009
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That Yanmar is a great engine, but it does shake. I would look at the mounts and the bed to reassure myself.
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Old 10-21-2009
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Quote:
Originally Posted by GaiaOrion View Post
....As well, can you do a compresion test on on of these- where do you screw in the tester ?.
You remove the injector and use the tester as you would with a gas engine and it's spark plug.

Sounds like you're reading an old survey... depending on how old it is you may want to consider another.
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