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Forums28
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Most Online238 Feb 9th, 2024
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The J/30 Class Association has partnered with West Marine and is now a member of the West Marine affiliate program. You can support the J/30 Class when you make your West Marine purchases online. The J/30 Class Association receives a percentage of sales from your purchases when you click through from our website. Click the logo above and you will be directed to the West Marine website with a cookie that identifies you as a J/30 affiliate. You can also use any discounts that you may be authorized.
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Re: Engine Trouble
[Re: JBiermann]
#15697
06/17/14 10:31 PM
06/17/14 10:31 PM
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Joined: Aug 2013
Posts: 164 Portland, ME
JBiermann
OP
Senior Member
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OP
Senior Member
Joined: Aug 2013
Posts: 164
Portland, ME
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Thanks bill, used kerosene to clean out the tank as best I could, definitely some sludge in the bottom. Replaced fuel filter and bled all lines to the injectors. With some persuasion I can get the engine to fire but I can't get the forward cylinder to fire consistently/evenly. The rear is steady and smooth but the forward is louder and more metallic sounding and will miss when the throttle is pushed and won't run at all at idle. Come to think about it, the engine has always had the loud tinny sound from I'm hearing from the front cylinder, I just assumed that's the way the engine sounded and you j30 guys were just gluttons for noise abuse but now that it's missing I can hear the rear cylinder firing on it's own and it's much smoother and quieter. Now I'm thinking injector? What's involved in replacing/tuning? Hope this thread helps someone else struggling with their engine.
Last edited by JBiermann; 06/17/14 10:33 PM.
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Re: Engine Trouble
[Re: JBiermann]
#15698
06/17/14 11:16 PM
06/17/14 11:16 PM
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Joined: May 2007
Posts: 2,669 Portsmouth, RI
Rhapsody #348
Past J/30 Class President
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Past J/30 Class President
Joined: May 2007
Posts: 2,669
Portsmouth, RI
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The problem is probably related to one of two items. 1. Injector nozzle not spraying a mist (clogged injector) 2. High pressure fuel pump output sending wrong amount of fuel to cylinder. #1 can be fixed by removing the injector and taking it to a diesel shop so they can pop test, and if required replace the nozzle. They can shim the injector to meter the right amount of fuel. Pull them both and label which cylinder they are matched to. When replacing the injector, be sure to replace the mica insulator that fits between the injector and the head. If that doesn't fix it, next try #2 requires returning the high pressure pump to a Yanmar repair facility. They can rebuild the seals and setup the fuel rack for proper metering of fuel at all rpms. This requires special test equipment and is why the task needs to be done at the Yanmar repair center. Refer to section 3 of the 2QM15 Service Manual located on the J/30 page under the menu Info, Diesel Engine Maintenance. This has detailed diagrams and rebuild procedures for the injector and fuel pump.
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Re: Engine Trouble
[Re: JBiermann]
#15702
06/21/14 10:00 PM
06/21/14 10:00 PM
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Joined: May 2007
Posts: 2,669 Portsmouth, RI
Rhapsody #348
Past J/30 Class President
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Past J/30 Class President
Joined: May 2007
Posts: 2,669
Portsmouth, RI
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Josh,
Are these "banjo" type fittings with the copper washer gaskets like on my 2GM? If so, replace the copper washers.
I reread your post. The supply lines are threaded, the recirc lines are banjo fittings. Don't get any teflon tape in the flared section of the supply line, only on the threads. Ideally you should replace the leaking line as this is designed to seal with the flared fittings and is under extreme pressure.
Last edited by Rhapsody #348; 06/22/14 06:42 AM. Reason: Edit for teflon tape.
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