Kerry, thanks for the excellent fuel pump dta it is impressive and will be very useful Ross
Date: Wed, 30 Jun 2010 09:48:14 -0700 Subject: Re: [UnifliteWorld] Detroit 6-71 weird stalling From: [email protected] To: [email protected] Wow. Excellent info yet again. I didn't realize the hot vs cold engine start thing. I should have been able to guess it though. I will have to check out the starter and grounds. The electric fuel pumps I got are inline backups for the mechanical pumps. I put in a series of ball valves to either put them in line or to bypass them completely. I can also use them to transfer fuel between tanks or polish the fuel. Total investment was about $300 and 8-10 hours of time. Probably could have been faster if I was a better "plumber". Here is a pretty darn good writeup that I followed to do mine. http://www.denninger.net/filters/out-with-the-old.htm I found it on a Hatteras forum originally. As some of you already know...I ran her completely out of fuel last season and getting fuel to the mechanic pumps and bleeding the injector rail was no fun. I love the new electric pumps. They are great insurance. Kerry On Wed, Jun 30, 2010 at 8:27 AM, Ross Robertson <[email protected]> wrote: Hi Kerry Starter turns over cold engine easily. Engine hot barely if at all until you up the volts. With a cold engine there is little or no compression in the cylinders - easy for the starter to it turn over. With a hot engine - just stopped, there is compression in some cylinders and the starter is not strong enough to overcome this. The weakness is usually because of reduced voltage at the starter. A test is if the + ve or -ve terminal of the starter or cables become hot on starting. ( it can also be caused by a bad negative cable ) Next is the starter motor, its brushes etc -- I have the same situation on one engine and have researched it a bit...hope this helps. p.s. until I can get round to it I just jump the house batteries! What are the electric fuel pumps you have installed -- am interested..are they in-line back ups ? Roger has given you a very professional run through! Cheers Ross. Date: Tue, 29 Jun 2010 22:29:46 -0700 Subject: Re: [UnifliteWorld] Detroit 6-71 weird stalling From: [email protected] To: [email protected] Good information thanks. Let me walk through the list: Fuel filters were checked. Brand new a month ago and checked again once I was in the slip. Look good. Fuel pumps are both mechanical and I just installed electric pumps over the winter. Fuel pressure gauges look good. Governor adjustment...definitely could be...haven't checked that one yet. Thanks for the thought. Sticky Rack...not sure, how do I diagnose? Water Contamination, could be but I don't think so. All three tanks were treated this spring and all three tanks have fresh fuel in them. I checked the fuel filters and didnt see any water. Improper stop setup, could be....not sure how to check Return Line Plugged, would this only happen at low RPM's dropping into reverse or would this happen in other circumstances as well? Couple of other thoughts..... Hitting the shutdown button, I have to hold it a LONG time. Seems there is not enough juice to activate the relay complete that cuts off the fuel supply. The starter BARELY turns over if at all. In order to that that engine to fire back up I have to put the starter battery and house bank in line. Just tried that for the first time when the engine died this week and it worked. Odd part is that this problem is ONLY with the port engine and both engines share the same starter battery. It FEELS like I have a power issue, but testing the starter battery, etc, I am getting plenty of CCA off the battery and plenty charge from the alternators. I just cant put my finger on it but it is the only thing that is keeping me from saying my boat is running like a top. Kerry On Tue, Jun 29, 2010 at 9:57 PM, ROGER YOUNG <[email protected]> wrote: Kerry: the engine stalling could be plugged fuel filters, low fuel pump pressure, improper governor adjustment, sticky rack on one injector, possible water contamination, improper stop setup with the rack being pulled out of the run mode, plugged return line at the cylinder head. It will require a tech to look at the problems. Fuel pressure should be checked at idle and full rpm for a reading or 15 to 20 psi at idle and 70 psi at maximum rpm to eliminate the fuel pump as the relief valve could be acting up in the fuel pump. The sticking rack can be located individually with the valve cover removed and the racks, if they are the new spring loaded types, can be pushed in manually and can be checked for binding in the injector body. Check the fuel return as it indicates a problem in the suction side if the return rate is below DDA specs which is .9 of a gallon in one minute at 1200 rpm. You can also check for air in the return fuel with the return line in a clear container and see if air is getting in the system. Check to make sure the stop lever is not pulling the governor stop lever out of full fuel which can cause a problem at idle. Just some ideas from a Detroit Diesel tech. Hope it helps Roger ----- Original Message ----- From: Kerry Lebel <[email protected]> Date: Monday, June 28, 2010 9:52 am Subject: Re: [UnifliteWorld] Detroit 6-71 weird stalling To: [email protected] > Interesting. I have three tanks on the boat. I run > port tank to port > engine and starboard tank to starboard engine. The center > take I use for > the genset and when the side tanks get low. How to you > diagnose a blockage? > > On Mon, Jun 28, 2010 at 9:49 AM, Monty Montaine > <[email protected]>wrote: > > My experience with a similar story when using my centre > fuel tank, the > > cross over return line was not open and it needs to be when > operating only > > from the one centre tank. > > > > Sounds to me like a there is a blockage and once it sits for a > while it > > will equalize...I’m not a formal mechanic, back yard mechanic. > > > > > > > > *From:* [email protected] [mailto: > > [email protected]] *On Behalf Of *Kerry Lebel > > *Sent:* June-28-10 9:02 AM > > *To:* [email protected] > > *Subject:* [UnifliteWorld] Detroit 6-71 weird stalling > > > > > > > > Hey All, > > > > > > > > I have a weird issue going on. My Detroit's run like a > top. I put the > > block heaters on for about 30 min and they fire right > up. They run smooth > > underway as well. The port side engine is acting up > though when I pull into > > the slip. When I am at no wake speed coming into the > harbor, she moves > > right along. The first time that I toss the port drive > in reverse to > > maneuver into my slip it will die. It then will NOT fire > back up. So I end > > up coming back into the slip on one engine. I am not > good at this. It > > takes a fun day trip and ends it on a stressful note. > When I try to restart > > the engine, it BARELY turns over, if at all. If I come > out the next > > morning, it fires right back up fine. I have had my > starter battery tested > > and it is fine. My voltmeters are showing that the > alternators are charging > > just fine as well. Anyone have any ideas? I could > use some ideas. > > > > > > > > Thanks, > > > > > > Kerry > > > > -- > > You received this message because you are subscribed to the > Google Groups > > "UnifliteWorld" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > > [email protected]<unifliteworld%[email protected]>> > . > > For more options, visit this group at > > http://groups.google.com/group/unifliteworld?hl=en. > > > > ------------------------------ > > IMPORTANT NOTICE: > > This email message is intended only for the use of the > individual or entity > > to which it is addressed, and may contain privileged or confidential > > information. If you are not the intended recipient, you are > hereby notified > > that any dissemination, distribution, copying or other use of > this email > > message is strictly prohibited. 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