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Old 02-12-2014, 10:40 AM   #41
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I guess one does not get to be our age without developing some healthy scepticism. The second place I took the injectors to was American Diesel in Kilmarnock. I figured they should know.
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Old 02-12-2014, 10:46 AM   #42
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If ADC said they were OK then I would believe it.
R.
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Old 02-12-2014, 11:16 AM   #43
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Another case of why I verify everything and do not trust much in technical areas.....
R.
Spoken like an FAA technical guy, good.
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Old 02-12-2014, 11:36 AM   #44
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I'm not sure about that...if they were a different injector than OEM but a suitable replacement and the tech verified by serial numbers from the injector manufacturer...that presents a common issue in the marine world.

My guess is that they were exactly the same but verifying sometimes isn't just one phone call unfortunately.
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Old 02-12-2014, 11:42 AM   #45
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I'm not sure about that...if they were a different injector than OEM but a suitable replacement and the tech verified by serial numbers from the injector manufacturer...that presents a common issue in the marine world.

My guess is that they were exactly the same but verifying sometimes isn't just one phone call unfortunately.
Does OEM even apply on a 30+ year old Lehman for any fuel system parts? Sure, AD or TAD can sell one stuff that should work, but mixing and matching old to new injectors can get interesting.
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Old 02-12-2014, 11:44 AM   #46
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Regardless of the injector manufacturer, the injectors need to open in accordance with the design of the engine...ie at the pressure and timing of the engine design. If the injectors open early (as is the case with low pop pressure) you are effectively changing the timing of when the fuel is introduced into the cylinder and therefore altering the combustion process.
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Old 02-19-2014, 12:31 AM   #47
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Definitely not trying to hijack this thread, just a quick question hopefully. In reading the thread and all of the experience and knowledge of components that can apparently make huge differences, is there a book or class to get caught up on how to maintain the FL120? Thanks!
~ Jeff
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Old 02-19-2014, 12:53 AM   #48
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.... is there a book or class to get caught up on how to maintain the FL120? Thanks!
~ Jeff
Well Jeff, there is the "Operators Manual & Parts Identification" book which came with the engine.
On p3 Robert F Smith, Executive VP writes " the most important recommendation I can make ....is "do not tinker"(his italics).....unless you know what you are doing, keep your hands off!"
The rest is more encouraging, deals with routine servicing, fuel bleeding, trouble shooting, etc.
I`d ask American Diesel if there is something more extensive, and newer. There are so many of these engines it would be surprising no one has put pen to paper. There are workshop manuals for obscure auto engines, why not for the FL?
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Old 02-19-2014, 12:54 AM   #49
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Jeff,

Trawler Fest in Anacortes this May has the Bob Smith 2 day class on the Lehman. I sent you a PM.
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Old 02-19-2014, 01:37 AM   #50
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Oh, I'd like to get in on that class. Sign up info please?
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Old 02-19-2014, 09:40 AM   #51
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Trawler Fest is in Anacortes this year again. Registration, from the passagemaker.com site is scheduled to open in late February. The class is part of what they call Trawler University, lasts 2 days and costs $450.00. Google Bob Smith Trawler Fest diesel class and you will get more info on what it I does.

I hear very good things about the class. I plan to do it.
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Old 02-19-2014, 09:55 AM   #52
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These Fords are basic tractor engines with mechanical IP. There is very little to know about these diesels that any general diesel class wouldn't teach. I have a basic diesel in my truck and that has helped me tremendously to understanding these Fords.

One thing I did was to buy new heat exchangers and I custom ordered larger longer units. This has kept the cooling in check for me.
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Old 02-19-2014, 12:50 PM   #53
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I am no diesel expert. But I am wondering why nobody is considering low coolant flow to be the cause of this. A partially clogged heat exchanger or obstruction in the cooling system could result in the last cylinder overheating.. Was the coolant pump impeller checked? Was the temperature of the coolant checked entering and exiting the heat exchanger? Where is the engine temperature measured? Is it where the coolant enters the engine or wwhere it exits? Or is it measuring the oil temperature.

I apologize in advance if these are noob suggestions, I am just trying to learn as much as I can.

Scott
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Old 02-19-2014, 01:08 PM   #54
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Perfectly reasonable questions - I have always advocated a new owner replace the heat exchangers and keep the old ones as spares. Particularly the transmission cooler as it has no warnings if it fails, until the transmission fails. One of the boats I looked at to buy had a milkshake in the trans. From a failed cooler.
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Old 02-19-2014, 02:46 PM   #55
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I am no diesel expert. But I am wondering why nobody is considering low coolant flow to be the cause of this. Where is the engine temperature measured? I apologize in advance if these are noob suggestions, I am just trying to learn as much as I can.

Scott
This was discussed in a few of the posts.
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Old 02-19-2014, 10:05 PM   #56
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I took Bob's Lehman class at Trawlerfest Anacortes several years ago, and it was well worth it. He had the class pull the Simms pump, injectors, and reinstall. Adjusted the valves, torqued the head, and restarted the demo FL120. Lots of fun.
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