Re: [Amel Yacht Owners] Diesel fuel problems and additives

Gregory Shea

I used to be very involved in two cycle lubrication a couple of careers ago and was wondering what "two stroke" oil do you use? The formulations for hot running air cooled two cycle engine lubricants are very different to cooler running water cooled (outboard) motors. The latter are designated TC-W for "two cycle water cooled" on their packaging. The air cooled stuff will create gum and varnish at the lower temperatures of a water cooled engine. The result can be disastrous, very quickly.
Similarly, all TC-W oils are not created equal. The ones sold by the motor manufacturers Mercury, Yamaha, Johmson, Evinrude etc. are of a uniformly high quality because their poor performance will reflect unfavorably on the brands. Major oil companies products are usually OK but you cannot be sure. As usual, it ibecomes a cost issue.
By the way, most of your litre is a diluent to thin it down so it will mix with the fuel. It used to be a kerosene type product but who knows what is today. In short, there is not much "oil" in outboard "oil" but it sure can make a mess.
I'm hopeful you are using a product that expects to get burnt in the combustion chamber and not stick the rings but, for what it's worth, my strong preference/practice is to use the outboard manufacturer's products when oil-fuel mixing is required.

Greg Shea
Sharki 133
Cap des Iles

To: amelyachtowners@...
From: amelyachtowners@...
Date: Tue, 28 Jun 2016 13:38:31 -0700
Subject: Re: [Amel Yacht Owners] Diesel fuel problems and additives

Bill, great question and I think the answer is “never” since the engine was rebuilt in 2010.  I’ll  put it on the top of my list. The staining isn’t very bad, but still annoying.  Thanks!

Dave Wallace
s/v Air Ops
Maramu #104
Sea of Cortez

On Jun 28, 2016, at 1:28 PM, 'Bill & Judy Rouse' yahoogroups@... [amelyachtowners] <amelyachtowners@...> wrote:


This is not a smart-ass answer/remark.

When is the last time that the valve lash was adjusted on your engine and/or generator?  If the valve lash is not adjusted correctly, you will get a lot of exhaust staining on the hull.

Bill Rouse
BeBe Amel 53 #387
Sent from my tablet
+1832-380-4970 USA Voice Mail

On Jun 28, 2016 1:13 PM, "Dave Wallace svairops@... [amelyachtowners]" <amelyachtowners@...> wrote:


Your post has prompted a question from me. What have you found works well for cleaning the exhaust from the hull?  Of course other members please feel free to chime in!


Dave Wallace
s/v Air Ops
Maramu #104
Sea of Cortez, Mx

On Jun 28, 2016, at 9:21 AM, Germain Jean-Pierre jgermain@... [amelyachtowners] <amelyachtowners@...> wrote:

Hello Aty & Mohammed,

Had a big problem on previous boat… however, we had the tank sucked out, fuel polished, changed all filters then no more issue.

We’ve not had any problem since installing the following upgrade on Eleuthera: a pair of Racor 75900 with a 4 way valve.  (1-2-both-off)

We also use a bacteria killing agent at all times.  Also, for those who use the low sulfur diesel… we do… (no choice in most places) we add 1 liter of 2 stroke oil to each 500 liters.  Makes up some lubricity for the drier low sulfur stuff though it contributes to extra hull cleaning chore aft of the exhausts..


Jean-Pierre Germain
Eleuthera, SM 007

On 28 Jun 2016, at 16:16, mshirloo@... [amelyachtowners] <amelyachtowners@...> wrote:


Hello everyone;

In talking to several different cruisers in the med, it appears that some have had some serious issues with bacterial or other types of growth in their diesel tanks leading to the need for disposal and deep cleaning of the fuel tanks.

I'd like hear others experiences and solutions to the problem in order to avoid the problem.

Thanks in advance

Mohammad and Aty

AMEL 54. #099

B&B Kokomo

Posted by: mshirloo@...
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