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Old 07-16-2013, 08:28 PM   #81
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Oil consumption amount/change... used to be and may well still be the parameter for engine overhaul. Cat used to publish the numbers for several of it's engines from my experience.
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Old 07-16-2013, 08:39 PM   #82
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Perkins engines seem to lose oil at every gasket, every joint, every bend and every opportunity.

A while back, I removed a fuel shut-off solenoid for replacement. Simple job, right? When a mounting bolt was removed, oil started seeping out the threaded hole! Surprised the hell out of me. I've never been a real gearhead, but I would think threaded holes into case of an engine would be placed into a reinforced areas with enough material to accommodate the bolt without allowing penetration into the inside of the case. Whodathunk?

At my present oil consumption rate, I'm not the least bit concerned about the health of my engines. They both start instantly (without preheat) and only smoke for a short period when cold upon start up.
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Old 07-16-2013, 08:58 PM   #83
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I'm at 25 hours since last oil change a d oil levels are constant. Although my RPM's are 1700-1900 range.
1200 total engine hours
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Old 07-16-2013, 09:18 PM   #84
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Perkins engines seem to lose oil at every gasket, every joint, every bend and every opportunity.
Isn't that called Perkins patina?

You could always tell when an old Harley I used to own was low on oil, it quit leaking.
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Old 07-16-2013, 09:24 PM   #85
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Isn't that called Perkins patina?

You could always tell when an old Harley I used to own was low on oil, it quit leaking.
If a Harley (Perkins) isn't leaking oil... You're out of oil.
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Old 07-16-2013, 11:38 PM   #86
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In approximately 300 hours and 2 oil changes I haven't used any oil the way I am using my Perkins. I have a few seeps but nothing leaving drops on the pads in the bilge. Based on hours and fuel I can pretty count on 1.2 gph. At my typical cruise that's what the Floscan shows and the totalizer is within 2% on filling up.

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Old 07-17-2013, 12:13 AM   #87
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Haven't noticed any drop of engine-oil level during routine checks or annual oil changes on my JD4045. (Now undergoing routine valve adjustment, oil change, and so on after 260-hour/26-month use.)
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Old 07-17-2013, 02:03 AM   #88
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My numbers as observed and recorded.



Attachment 21287

Your Perkins is roughly equivalent to my Lehman, so I was compelled to make a picture. Thought I might share. Looks the sweet spot is 1800 RPMs. Thanks for your measurements!
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Old 07-17-2013, 03:03 AM   #89
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[QUOTE=FlyWright;168572]Perkins engines seem to lose oil at every gasket, every joint, every bend and every opportunity.

A while back, I removed a fuel shut-off solenoid for replacement. Simple job, right? When a mounting bolt was removed, oil started seeping out the threaded hole!
=============================================

Ha Ha Ha!! That's a good one. Same thing when replacing the exhaust manifolds; you also need to remove the studs from the block, clean, inspect and dab a little sealer on the threads before screwing them back into the block. Some of the studs penetrate the oil galleys and may weep oil when hot if you don't.

You're right Al, those N/A Perkins engines will run forever if they're maintained properly. Unfortunately, running old technology engines means a little smoke when they're started cold, which some folks find objectionable.

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Old 07-17-2013, 07:09 AM   #90
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Your Perkins is roughly equivalent to my Lehman, so I was compelled to make a picture. Thought I might share. Looks the sweet spot is 1800 RPMs. Thanks for your measurements!
Very nice!
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Old 07-18-2013, 11:12 AM   #91
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My JD4045's (2400 max. RPM) "sweet spot" is 1800 RPM providing 6.3 knots, a knot below hull speed, at less than 2 GPH. That's better than 3 nautical miles per gallon. There is a slight visible vibration of the Coot's propeller shaft between 1900 and 2100 RPM so avoid them. Hull speed is achieved at 2200 RPM using 4 GPH, or less than 2 nautical miles per gallon. That extra knot, a 16 percent increase, increases fuel consumption rate by over 50 percent. With strong adverse currents, however, the difference in fuel consumption for speed over ground/bottom, decreases.
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Old 07-18-2013, 11:50 AM   #92
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...With strong adverse currents, however, the difference in fuel consumption for speed over ground/bottom, decreases.
Here’s our trip summary for both Colombia to Aruba and Aruba to Curacao. On the Colombia trip we had some positive current and 15 kts on the nose (average). On the Aruba trip we had ~2 knots of contrary current and 25 knots on the nose.

Santa Marta to Aruba 1.46 gph 3.82 mpg 5.6 knot average
Aruba to Curacao 1.74 gph 2.11 mpg 3.6 knot average
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Old 07-18-2013, 04:42 PM   #93
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Your Perkins is roughly equivalent to my Lehman
You know, Ben, I would have thought so too, but when we were together coming from Morehead two weeks ago, you were running the same speed and I, but, according to your cool chart (and I want to remember we chatted on the radio about it), were running several hundred rpm's less than us. I suppose it gets down to prop pitch because our hull speed is probably roughly the equal.

I am at 17. Do you know yours?
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Old 07-18-2013, 06:15 PM   #94
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I am at 17. Do you know yours?
My prop is a 21x24
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Old 07-18-2013, 08:04 PM   #95
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Well, that explains quite a bit now doesn't it. ;-)

And what's with the new avatar pic?
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Old 07-18-2013, 08:53 PM   #96
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Well, that explains quite a bit now doesn't it. ;-)
Indeed it does.
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Old 07-19-2013, 10:58 AM   #97
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My prop is a 17/21
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Old 07-19-2013, 07:00 PM   #98
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Well, that explains quite a bit now doesn't it. ;-)
Bigger equipment, longer stroke, smoother motion. Makes sense to me.
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