On Sunday, I was returning to port, about 10 miles off of Southern California, when my engine just quit .... as if it were shut off. To provide some background: I have 37' Hershine with a single 120 Lehman. I had been running about two hours at 1750RPM. Engine temp was 172, Oil pressure was 50-60 and pressure on the Racor fuel filters was less than 2. The motor never missed and RPM never varied .... the motor just stopped. On inspection of the engine, everything appeared fine. There was no abnormal smell, smoke or fluids. Taking the approach of "start simple and work to the more complex" I switched from the primary Racor filter to a secondary. The engine started on first crank and I proceeded as if nothing ever happened. I never had to bleed the fuel lines or anything. The engine just started as if nothing ever happened. The unexplained is always more worrisome to me then the problem with a reason. My fear is that this could happen at a critical moment as opposed to out in the channel in good weather. The obvious explanation would be the fuel filter, but the engine never acted like it was starving for fuel and I never needed to bleed the fuel lines. The filter was not old and I have never had a fuel problem (e.g. algae). Any Lehman 120 owners in the list with some other ideas? -----Original Message----- From: owner-trawler-world-list@samurai.com [mailto:owner-trawler-world-list@samurai.com]On Behalf Of Jim Donohue Sent: Tuesday, February 01, 2000 7:08 AM To: Thataway@aol.com; trawler-world-list@samurai.com Subject: RE: TWL: Re: Isolation Transformers/A dumb question Bob - You do not connect the shore ground wire to the boat at all. It goes to the isolation transformer where it is connected to the shield between the windings and to the case. This is basically to protect against a fault in the primary of the isolation transformer. It connects no where else and does not connect to the ground on the boat. Thus no isolator is needed. Someone also suggested that it is straightforward to test a galvanic isolator with a multi-meter. I think this is incorrect. It is in fact the subject of much discussion as many isolators are busted but there is no good way to check. They can be tested but it is not simple - particularly if they are in circuit. Jim -----Original Message----- From: owner-trawler-world-list@samurai.com [mailto:owner-trawler-world-list@samurai.com]On Behalf Of Thataway@aol.com Sent: Tuesday, February 01, 2000 4:44 AM To: trawler-world-list@samurai.com Subject: Re: TWL: Re: Isolation Transformers/A dumb question It seems to me that a transformer is basically a coil between the "hot" side of the AC and the neutral (with ferrous plates and another coil, which picks up the current/voltage isolated from the first coil). If this is the case, then it follows that although the ground wire is usually at the same potential as the neutral, it may not be and if the ground of the Source was dirrectly connected to the ground of the boat (perhaps including the case of the transformer) that one still would need a galvanic isolator for the ground circuit. Bob Austin

Just read an article where the electric solenoid engine stop valve on the Lehman fuel feed was sticking and would shut down the engine just like you'd turned off the key. I've also experienced a very small air leak in the 'suck' side of the feed pump that would slowly build up enough trapped air to eventually pass a bubble to the injector pump, and the engine would just wind down and die (slowly). This doesn't exactly fit your description though... Good luck, -Louis SEASTAR - Redwood City, CA At 9:01 -0800 2/1/00, Cameron King wrote: >On Sunday, I was returning to port, about 10 miles off of Southern >California, when my engine just quit .... as if it were shut off. nip...