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Old 09-08-2019, 09:43 PM   #21
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thanks

Thanks for you quick reply. I am planning to have the pump checked out ASAP. You have both verified what I suspected.

Cheers from Vashon
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Old 09-09-2019, 02:52 PM   #22
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Originally Posted by Comodave View Post
I took Bob Smiths last Lehman seminar. He talked about the oil in the 120 injection pump and how it gets diluted with diesel. His opinion was that this was a critical issue and should not be overlooked. I would fix it asap. Some will say it is ok, but Bob did not. Now who are you going to listen to?
A friend is still running his Lehman 120 after finding out eight years ago that the injection pump oil should be changed. Before that he ran it for THIRTEEN years and probably 2,000 hours without changing the oil. When he did it was very diesely. That pump is still running that 120 today. I don't know what to conclude from this except maybe these pumps are more robust than most think. Maybe it's also why Bob Smith updated his oil change recommendation from 50 to 150 hours. Perhaps no one has ever tested how long a pump can go without an oil change so no one one really knows what the best interval ought to be, hence, change it often.
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Old 09-09-2019, 03:40 PM   #23
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Fortunately my engines don’t have the same system as the 120 so I don’t have a separate oil to change. However if I had a 120 I would change the oil. Just because someone got away without oil or changing the oil does not mean that it will work for everyone. Do you run your engine without oil or diluted oil, of course not. So why would anyone do that to an expensive injection pump. There is a signature on this site something like; There is the right way, the wrong way and the way someone said they got away with... Getting away with it does not make it right. And Bob did say that 50 hours was the recommended starting point and that any given engine might be able to go longer. He said this at his last seminar shortly before he died, so I will take it as his last opinion.
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Old 09-09-2019, 04:02 PM   #24
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This is what I have heard through the years....


Bob also has said the 50 hrs was simpler than trying to figure out if you DID have dilution.


Bob also said that a new injection pump probably could go longer but the trick was to figure out when the dilution started and start decreasing change interval.


He also changed his mind on more than a few things through the years and now his son has changed a few more.


Bomac who knows a thing or two about Lehman's has some different thoughts too from Bob's.


It's OK to understand why an expert might say one thing knowing most owners aren't mechanically inclined or given to analytical thought and think beyond that.
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Old 09-09-2019, 04:41 PM   #25
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I wasn't suggesting not to change the oil. I change mine at 100 hours. The anecdote I related was to illustrate that these pumps, apparently, can take a lot of abuse. Some boaters might be frightened into an expensive repair unnecessarily just because their oil hadn't been changed out for a long time or it was run dry. Change the oil at 50, 100, 150 hours, whatever you feel comfortable with and run the pump until it dies. Methinks that will be a long time coming but with boats one never knows. Injector pumps generally don't just stop one day. There will be warning signs.
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Originally Posted by Comodave View Post
Fortunately my engines don’t have the same system as the 120 so I don’t have a separate oil to change. However if I had a 120 I would change the oil. Just because someone got away without oil or changing the oil does not mean that it will work for everyone. Do you run your engine without oil or diluted oil, of course not. So why would anyone do that to an expensive injection pump. There is a signature on this site something like; There is the right way, the wrong way and the way someone said they got away with... Getting away with it does not make it right. And Bob did say that 50 hours was the recommended starting point and that any given engine might be able to go longer. He said this at his last seminar shortly before he died, so I will take it as his last opinion.
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