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January 20, 2019 at 4:58 pm #54715
Philip, what are you referring to by CPL?
January 20, 2019 at 4:47 pm #54714No-one is saying its not overpropped, I’m trying to correct the existing problem before removing props and having them adjusted.
January 20, 2019 at 4:27 pm #54700Tony,
I ran the boat again today and took some pictures and video that I would like to send you as the videos won’t load here. Where can I send them?
Here are some snapshots though of gauges at different rpm
The first pic is a screenshot of video taken at full throttle. The other three pics are values at 1850rpm.
Top gauge is port
January 19, 2019 at 9:33 pm #54639Hi Tony,
I’ve owned the boat now for about 6 years.
1. I have never seen 2650-2675 rpm and had no idea it should be getting to that.
2. Never
3. Yes have seen 2500 after new bottom paint, maybe 2 years ago.
4. Yes have seen 2400 recently, early last year.
To be honest I don’t run the boat at WOT often, I usually run the boat at a cruise anywhere between 1800-2000 rpm and on return at WOT for maybe 4 mins or so.
The last time I recorded any GPH, this is what I was obtaining,
11gph @ 19kts (1830rpm)
14gph @ 23kts (2000rpm)
15gph @ 24kts (2090rpm)January 19, 2019 at 5:29 pm #54625Hi Tony,
Sorry for the late reply.
1. I will take the pictures tomorrow and post them later in the night.
2. Will take off air filter and separator tomorrow as well.
3. The aftercoolers came from a cummins dealer in Miami whom we do business with. We took them apart in our shop as I was sure I read on your technical advice page that they should be prepared and greased as per your advice for easier dismantling in the future. This work was performed by one of my technicians following the instructions from your page.
4. I did another test today and noticed these which I think are worthy of mentioning. The stbd engine with the problem comes up in RPM the same as the port until it reaches about 1350 rpm when it starts to get left behind, it does however climb in rpm from there on quicker than it did before with help from the port engine but at a lower rpm (200-400 less). It will then reach to about 2100 RPM whilst the port is at 2300. At this point the water temperature on the stbd engine climbs to about 15 degrees higher than the port at which time I reduce RPM on both back to 1000 to return to dock. At some points through this range of rpm the boost matches the stbd however at its maximum rpm (2100) it has less boost than port.
As the problem originally occurred after the fuel level was extremely low in the tanks, is it possible that the stbd engine is starving for fuel hence not able to produce the boost. And would this if so cause the egt to be high in turn causing the water temp to rise? Could this have been the original problem and with the high EGT caused the after cooler to crack?
Best,
Jeff
January 15, 2019 at 8:45 am #53795Rob,
Yes all boost hoses and clamps checked, no air leaks found in the system, and yes its behaving EXACTLY as before aftercooler change.
Jeff
January 14, 2019 at 5:58 pm #53747Ok ……….. FINALLY got new after coolers to Jamaica, disassembled and greased as per sbmar after cooler maintenance advice, then installed. STILL no boost from stbd engine š
Removed exhaust riser and took pic of exhaust side of turbo (attached)…….
TOTALLY lost now….
November 12, 2018 at 12:35 pm #41315Hi Tony,
Yes I will be supervising the work using a mechanic from my Auto Dealership. I am going to remove the exhaust elbows and inspect the turbos and will send pics once I have completed that.
Best,
Jeff
November 8, 2018 at 8:47 am #40812Tony,
Not everyone is versed on the “aftercooler maintenance” and I was ignorant to the fact, now that I know I am trying to correct the problem and came here after doing internet searches! So for the past 20+ years I’ve been enjoying my life without the worry of aftercoolers. I didn’t bother to post the pics of the engines as the issue was found and I didn’t think it was still necessary. I have now attached the pics as you have asked.
Jeff
November 7, 2018 at 6:27 pm #40765Ok I have removed both aftercoolers and taken them apart. Attached are pics of the inside of housing before any cleaning on the port one that was not cracked. My question is can this housing be used back even though the coating to the inside walls that touch the inner core has corroded away?
November 1, 2018 at 5:44 pm #39877What would have caused this?
November 1, 2018 at 2:42 pm #39833Thanks everyone, whilst taking the pics I decided to swap around aftercoolers and thats when we found the aftercooler housing was cracked.
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