Official Caterpillar3116/3126 Thread

Looking for replacement temperature sensor for the helm 20 to 240 temp gauge. Would that be from a Cat dealer? The gauge is a sea ray/Faria.
 
Today was launch day, after a year of refit. Of course there's a very long list of things remaining, but they can be done at the dock.
Couple of questions for the group.
First, how the heck does one get the 6" exhaust hose over the horn as shown by the yellow circle in the attached picture? I used heat and tried lubricants and got it on... sort of. It leaks slightly, so need to fix that.

IMG_0847.jpeg

Second, the starboard engine doesn't make full rpms (it's the rebuilt one) only getting up to 2200 rpms. Didn't have time to diagnose. Wondering if it's a cable adjustment or some other adjustment I can do. Have a marine diesel mechanic buddy who can take a look but he's traveling for at least another week.
 
Njlarry said:
Is that 2200 rpm in neutral or under load at cruise? Pros will want to know as fuel/engine issues vs prop/load issue.
Click to expand...
Should have specified. Under load. Had to make an appointment so didn’t have time to troubleshoot. The port engine had no issues. May be able to get down there tomorrow to investigate.
 
SCFoster said:
Today was launch day, after a year of refit. Of course there's a very long list of things remaining, but they can be done at the dock.
Couple of questions for the group.
First, how the heck does one get the 6" exhaust hose over the horn as shown by the yellow circle in the attached picture? I used heat and tried lubricants and got it on... sort of. It leaks slightly, so need to fix that.

View attachment 150113

Second, the starboard engine doesn't make full rpms (it's the rebuilt one) only getting up to 2200 rpms. Didn't have time to diagnose. Wondering if it's a cable adjustment or some other adjustment I can do. Have a marine diesel mechanic buddy who can take a look but he's traveling for at least another week.
Click to expand...
For the rubber exhaust hose, lots of heat from a heat gun (get the rubber so hot its almost smoking) and a lot of soapy water or lube.

Not enough info to tell why your not getting full RPM, but cable would be first thing to look at it.
 
I’m trying to source a replacement temperature sensor for the helm 120 to 240 temp gauge. It is not a Caterpillar supported item. The gauge is a sea ray/Faria original item. Any information is greatly appreciated. Thanks guys
 
SCFoster said:
Should have specified. Under load. Had to make an appointment so didn’t have time to troubleshoot. The port engine had no issues. May be able to get down there tomorrow to investigate.
Click to expand...

Basics first for sure: throttle cable and be sure governor is hitting the stop, check the turbo to aftercooler hose clamps and hose to make sure there’s no boost leaks, make sure the primer is closed completely, fuel hoses are tight, air filter clean

Any smoke from that side under load?
 
Riptide III said:
I’m trying to source a replacement temperature sensor for the helm 120 to 240 temp gauge. It is not a Caterpillar supported item. The gauge is a sea ray/Faria original item. Any information is greatly appreciated. Thanks guys
Click to expand...
post #2843 has the link
 
Strecker25 said:
Basics first for sure: throttle cable and be sure governor is hitting the stop, check the turbo to aftercooler hose clamps and hose to make sure there’s no boost leaks, make sure the primer is closed completely, fuel hoses are tight, air filter clean

Any smoke from that side under load?
Click to expand...
Thanks. Throttle and governor stop good. Fuel hoses good and air filter brand new. Will check other items.
3000 rpm no problem in neutral.
Will check the other items. Engine under warranty so it will get fixed.
 
did you have the timing and injectors set?

BEST !

RWS
 
Maybe A Dancer said:
did you have the timing and injectors set?

BEST !

RWS
Click to expand...
Yes. Engine was rebuilt by T&S Marine in Crisfield MD. They bench tested it before I picked it up. Have a marine diesel mechanic friend who's going to stop by next weekend to take a look. This happens to be a bad weekend to ask for a favor, even if I've known him for 40 years.
Going to do the shaft alignment re-check as well, with the boat having been in the water a few weeks by then.
 
Riptide III said:
I’m trying to source a replacement temperature sensor for the helm 120 to 240 temp gauge. It is not a Caterpillar supported item. The gauge is a sea ray/Faria original item. Any information is greatly appreciated. Thanks guys
Click to expand...
I had to replace a temperature sender about 6 months after I bought my 1996 450DA with 350 hp 3116's. It was a Teleflex gauge package and we tried a Cat sender then learned the OEM vendor was Teleflex. I do not have a part number or specs, but the Teleflex sender worked flawlessly for 27 years.

Hope that helps.

Frank
 
Maybe A Dancer said:
The data above was taken at different times, and under different conditions, mostly smooth seas.

The data below was taken with smooth seas, but taken at ONE time only, and was incrementally done in 100 RPM increments.

50% fuel and 50% water with full tabs.

At this load factor the sweet spot is higher than the anticipated "2150" number I was previously assuming.

At the 50% load factor 2300 seems to be the magic number for this boat, which also goes along with the "sound" and the "feel" at that RPM - feels like the engine is not working as hard as at 2000-2200 range.

Next time I fill up for fuel and water I'll do the same test to see the difference fully loaded, which will likely yield a different story.

BEST !

RWS
View attachment 149062
Click to expand...
Quick update here:

Filled both fuel tanks.

Switched both engines to STBD, ran the genny only on the PORT side.

Anchored out for 31.3 hours with all 120/240 breakers ON, running two HVAC's in late August Florida heat, left the (yes it's a heat exchanger too) hot water tank ON and used toaster oven and burner stove.

Upon returning, filled up again and was SURPRISED to find the genny had only burned 13.06 gallons.

This changed my estimated genset fuel burn from .82 GPH to .417 GPH

With this data plus my trip mileage and actual fuel added numbers, I have adjusted the actual fuel usage from the trip and can confirm the revised data (below) as accurate.

Not 100% sure but reasonably sure that I got the math right.

Perhaps someone, maybe Tom Mott would like to review the spreadsheet?

I'd be glad to share it.

Anyhow, the next step will be to get a broader sample of GPH @ RPM numbers, as it appears there is a significant deviation between these numbers and the published CAT tables, especially at lower RPM's.

I do meet the 2800 RPM WOT requirements.

Finally, I am still amazed (and pleased) that the sweet spot for this boat is 2200-2300 RPM, and not 1800-2100 as I was expecting based on the CAT tables. More on this as the data are collected.

Columns are for PORT/STBD & TOTAL.

IMG_2597.JPG
 
Maybe A Dancer said:
Quick update here:

Filled both fuel tanks.

Switched both engines to STBD, ran the genny only on the PORT side.

Anchored out for 31.3 hours with all 120/240 breakers ON, running two HVAC's in late August Florida heat, left the (yes it's a heat exchanger too) hot water tank ON and used toaster oven and burner stove.

Upon returning, filled up again and was SURPRISED to find the genny had only burned 13.06 gallons.

This changed my estimated genset fuel burn from .82 GPH to .417 GPH

With this data plus my trip mileage and actual fuel added numbers, I have adjusted the actual fuel usage from the trip and can confirm the revised data (below) as accurate.

Not 100% sure but reasonably sure that I got the math right.

Perhaps someone, maybe Tom Mott would like to review the spreadsheet?

I'd be glad to share it.

Anyhow, the next step will be to get a broader sample of GPH @ RPM numbers, as it appears there is a significant deviation between these numbers and the published CAT tables, especially at lower RPM's.

I do meet the 2800 RPM WOT requirements.

Finally, I am still amazed (and pleased) that the sweet spot for this boat is 2200-2300 RPM, and not 1800-2100 as I was expecting based on the CAT tables. More on this as the data are collected.

Columns are for PORT/STBD & TOTAL.

View attachment 150663
Click to expand...
Obviously, Generator fuel burn rate is related to load - As a rule of thumb a 10KW genset at 50% load will be around 0.53 GPH at 75% load 0.65 GPH and at 100% load 0.88 GPH. A 15KW genset is 0.69, 0.94, and 1.22. And a 20KW is 0.90, 1.30, and 1.60.
I think your averages look great but what isn't known is the engine loads over the consumption timeline. Load is the variable that determines economy. At 10 MPH your fuel consumption per mile is significantly different that at 25 MPH.
 
ttmott said:
Obviously, Generator fuel burn rate is related to load - As a rule of thumb a 10KW genset at 50% load will be around 0.53 GPH at 75% load 0.65 GPH and at 100% load 0.88 GPH. A 15KW genset is 0.69, 0.94, and 1.22. And a 20KW is 0.90, 1.30, and 1.60.
I think your averages look great but what isn't known is the engine loads over the consumption timeline. Load is the variable that determines economy. At 10 MPH your fuel consumption per mile is significantly different that at 25 MPH.
Click to expand...
Plus I believe this specific boat is heavier than most due to thrusters, batteries, equipment, tools & spares and THE FLOORING.

This may be the reason for a higher speed sweet spot, and the huge difference between half tankage vs full tankage and the differences in smooth vs. rough water.

I'm really glad I saved those Floscans from the Trojan.

The instant NMPG numbers are enlightening.

BEST !

RWS
 
I plan to drain, flush and refill the antifreeze in both engines this fall. I've been Googling to learn how to do this, and not finding any great results.

Is there an article or a link here someone can refer me to?
 
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