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Old 07-20-2017, 06:19 PM   #141
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When you sea trial, make sure the fuel burn numbers are roughly the same as the other engine. Seen where one engine was replaced with one "slightly different" than the original and it drove the owner nuts having twins not running the same.

This is twin engine, right??
My second engine gets amazing fuel performance. Regardless of the speed I'm running, it burns 0g/hr and is so quiet you would swear it isn't even there...

Yeah, just a single.
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Old 07-21-2017, 06:32 PM   #142
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Well, I did the sea trial with the new engine today. It went well. The started right up, ran smoothly, nothing leaked, and it moved the boat through the water.

The swap went well, there is one small ding in the gelcoat of my transom that occurred moving the new engine in place but that is all. I do have a Cummins Recon warrantee, 2 yrs or 2000 hrs.

The max RPM it achieved was only 2920, a bit shy of the rated 3000. Last year at the survey, the prior engine achieved 2925, but the boat was empty of any owners items. Today I had 1/2 fuel, 1/4 water, and all my junk on board. My feeling is that I'm just a tad over propped. I'll see about maybe adjusting the prop at some point. I must say, I don't like running the boat at WOT. It is not pleasant. It is very pleasant at 1400-1500.
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Old 07-21-2017, 06:36 PM   #143
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Greetings,
Mr. dh. Atta boy! Great to hear everything went well.
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Old 07-21-2017, 06:38 PM   #144
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Well, I did the sea trial with the new engine today. It went well. The started right up, ran smoothly, nothing leaked, and it moved the boat through the water.

The swap went well, there is one small ding in the gelcoat of my transom that occurred moving the new engine in place but that is all. I do have a Cummins Recon warrantee, 2 yrs or 2000 hrs.

The max RPM it achieved was only 2920, a bit shy of the rated 3000. Last year at the survey, the prior engine achieved 2925, but the boat was empty of any owners items. Today I had 1/2 fuel, 1/4 water, and all my junk on board. My feeling is that I'm just a tad over propped. I'll see about maybe adjusting the prop at some point. I must say, I don't like running the boat at WOT. It is not pleasant. It is very pleasant at 1400-1500.
Well, hope it all continues fine, but that was an impressive response by Cummins. Wasn't impressive the engine was damaged to start with but nice to see a company accepting their responsibility and then responding so quickly.

It also shows what can be done.
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Old 07-21-2017, 07:33 PM   #145
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wow I am impressed yu can measure RPM by 5 increments, on my venerable I get measurement by 100 increase

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Old 07-21-2017, 07:38 PM   #146
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Great to hear, Dave. It's impressive what pros can do. Makes the guy who works on my boat look downright lazy!
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Old 07-21-2017, 07:39 PM   #147
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If you mess up you fix up

Could use another word instead of "mess", but Cummins and or its agents did the right thing, quickly,once the collateral damage was identified.
David, I hope this gets you back to enjoying your boat, with a "new" engine as compensation for the experience.
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Old 07-21-2017, 08:10 PM   #148
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Yup, I am looking forward to getting out on the boat. I want to put some hours on the engine over the next couple weeks to make sure everything is in good shape before we head North.
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Old 07-21-2017, 09:40 PM   #149
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Run it hard for a while to bed the rings in. Not WOT, but harder than 1600.
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Old 07-21-2017, 09:43 PM   #150
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Dave, glad to hear everything came together so well and quickly! Did they give you any break in recommendation and first oil change requirements?

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Old 07-21-2017, 09:45 PM   #151
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Old 07-21-2017, 10:31 PM   #152
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Dave, glad to hear everything came together so well and quickly! Did they give you any break in recommendation and first oil change requirements?

Ted

They gave me a ReCon manual that supplements the normal Cummins engine manual. I have not had a chance to read it yet. That will happened tomorrow and I will follow its advice.

I asked the mechanic today about break in (not their top Cummins tech but an experienced mechanic), he said follow the recommendations but... he recommended running it at a variety of power levels for a while rather than just my normal putting along at 1400-1500. He also said that regardless of what the book says, if it was him he would likely change the oil at 50 hours.
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Old 07-21-2017, 10:33 PM   #153
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Run it hard for a while to bed the rings in. Not WOT, but harder than 1600.


That is pretty much what the mechanic suggested and I will try to get some hours in doing just that before we go North. I'd rather find issues this weekend within reach of Vessel Assist, than when I am crossing Georgia Strait.
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Old 07-21-2017, 11:08 PM   #154
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"He also said that regardless of what the book says, if it was him he would likely change the oil at 50 hours."


Oh my goodness yes! IMO 25 hrs. is when I'd first change it... then at 50 hrs.again. That said, I an extremely [some say overly] cautious when breaking in any engine; be it brand new or fresh rebuild/reman.
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Old 07-22-2017, 12:08 AM   #155
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On my new Cummins Long Block there was a tag to change the oil at 10 hours, which I did even though it was still clean. I ran at various speeds throughout the first ten hours from 8 to 23 knots but never staying at one speed for long.
Per Tony Athens, Cummins have convex ring shapes when new. They wear to fully flat at about 300 hours. I am at that and my Racor vent filters are still clean and not a drop in the puke bottle.
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Old 07-24-2017, 02:22 AM   #156
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I looked at the material yesterday. Not a lot there other than the statement that the engine doesn't require any special break-in procedure. The first oil change is called for at 250 hours or 6 months. I won't go that long.

I did discover yesterday that the location of the oil dip stick is a bit different. Rather than a verity long dip stick that came up to the top of the engine, making it easy to reach but awkward to get to go back in smoothly, this one is on the port side of the engine and only 12 inches long. Really hard to get get to, but much easier to get in and out.
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Old 07-24-2017, 06:16 AM   #157
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When an engine gets broken in it generates heat.

A modest RPM , then a period of higher power , with a return to a modest RPM will allow the engine to change shape , as well as get rid of the added heat.

As the engine wears in longer and longer times can be spent at high loads.

Except to make a log reading WOT should seldom be carried , 10% less would be OK for high cruise. Watch for black smoke.
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Old 07-24-2017, 11:30 AM   #158
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When an engine gets broken in it generates heat.

A modest RPM , then a period of higher power , with a return to a modest RPM will allow the engine to change shape , as well as get rid of the added heat.

As the engine wears in longer and longer times can be spent at high loads.

Except to make a log reading WOT should seldom be carried , 10% less would be OK for high cruise. Watch for black smoke.


My concern isn't too much time at a high power, but possibly too much time at a low power. Most of the last year I have been running at 1400 rpm. Based on my outing on Saturday, it looks like 1450 will be the sweet spot with this engine. 1450 gives 2.0 gph fuel burn and just over 7 knots (speed is tough to know since there is always a current).

For now, the plan will be to run it at a variety of power levels from 1400 to 2000. On Saturday I would run at an rpm for 20 minutes then bump it up or down and repeat. I want to do this over the next couple weekends before we head out for trip North. Then we likely will cruise at 1400-1500 with short periods at 1800 every few hours.
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