Ranger 25 SC. YANMAR LOW OIL PREASURE,

[03mercedes]

My 2012 25 SC tug has a yanmar 150 hp turbo engine. When I first crank it after siting for a while, the ow oil buzzer stays on way too long. (I think) ? By the time I get the very poorly placed and lit electronic oil gauge to show up, the buzzer is off.
I am wondering if I am damaging the engine during this 60 to 90 second time period.
I would like to put a manual gauge on the engine so I can look as soon as I crank the engine. Can this be done and where?
Also, are there any revisions or exchange gauge arrangements that can be made to replace this very poorly lit hard to see gauge cluster.
I love my low hour tug, but am afraid to use it due to electronic gauges.
Regards, Old Jim

 

[baz]

Yes, I agree the Yanmar engine display is not easy to see and I always had a flashlight handy for shining it on the display at times.

If I recall correctly, when you first turn the engine start key to first indent doesn't the signal sound while the engine oil builds up pressure, and then when this signal stops one cranks the engine ? ...or maybe that signals refers to fuel build up pressure.... maybe others can chime in on this for you.

The 60 to 90 secs sounds like far too long for what I've mentioned above though.

There were several Yanmar Tech notes with one related to oil pressure I believe.... check this out with a search in this forum.

After engine starts is the engine oil pressure reading on the display and does it get up to normal range after a bit ?

Check following posts for additional help maybe...
http://www.tugnuts.com/viewtopic.php?f=6&t=11201&p=76844&hilit=Yanmar+oil#p76844
Yanmar Service Advisory YASA2014-005-M
http://www.tugnuts.com/viewtopic.php?f=5&t=5590&p=40086&hilit=YASA2014#p40086

Good luck....

 

[TexasEye]

The alarm is for all of the annunciator lights and is in test mode when you first turn on key. ALL of these lights and the alarm should go out after starting. Oil Pressure is normally high immediately after start until it warms up. If oil pressure light and alarm stay on for longer than "Immediately" I'd shut down the engine. If the Oil Pressure gauge doesn't indicate pressure I'd shut the engine down. Remember when oil is thick/cold pressure is high when thin/hot pressure is lower, know your engine normal operation fingerprint...

IMHO...if warm up takes 60 to 90 seconds for Oil Pressure I'd say something is wrong...may not be, but I'd certainly investigate. My Yanmar immediately after starting shows mid range plus and the temp is ZERO for 3 to 5 minutes and then very slowly increases to normal op range. My buzzer (alarm) and lights all go off immediately after start...

 

[TexasEye]

Yes, I agree the Yanmar engine display is not easy to see and I always had a flashlight handy for shining it on the display at times.

If I recall correctly, when you first turn the engine start key to first indent doesn't the signal sound while the engine oil builds up pressure, and then when this signal stops one cranks the engine ? ...or maybe that signals refers to fuel build up pressure.... maybe others can chime in on this for you.

The 60 to 90 secs sounds like far too long for what I've mentioned above though.

There were several Yanmar Tech notes with one related to oil pressure I believe.... check this out with a search in this forum.

After engine starts is the engine oil pressure reading on the display and does it get up to normal range after a bit ?

Check following posts for additional help maybe...
http://www.tugnuts.com/viewtopic.php?f=6&t=11201&p=76844&hilit=Yanmar+oil#p76844
Yanmar Service Advisory YASA2014-005-M
http://www.tugnuts.com/viewtopic.php?f=5&t=5590&p=40086&hilit=YASA2014#p40086

Good luck....

The on position is a test circuit for the buzzer (alarm) and the annuciator lights it doesn't do nothin' to the engine...once started the lights and buzzer should go off...It's just like your car or truck, turn on the key and the test circuit runs a check until the car is started then they all go off

 

[baz]

I believe the ON position also pressurizes the fuel.... but could be wrong about that. From my recollection when the key is turned to ON one can hear a whine which presumably is the fuel pump winding up.

 

[TexasEye]

Yep, sorry, On turns on the electric fuel pump, fuel ejection requires pressure before it will start

 

[03mercedes]

I want to think all that have tried to help me with this oil preasure problem.
This is my first very low hour tug and don’t want to damage it.
I would also like everyone know that trying to log into this tugnuts site is a nightmare.
If anyone knows how to put a manual oil preasure gauge on the yanmar 150 turbo diesel, I would appreciate it.
I’m not good with the digital readout display. By the time I get the gauge to read oil preasure, the buzzer is off.
I’m old school and want to see the oil preasure jump straight up as soon as I crank the engine.
I am new to these tugs and am wondering about holding the key in the om position for a few moments and then turning it to start. There may be something to the building of fuel preasure for the diesel pump. Not sure.
I think I’ll go to the marina tomorrow and try and crank it again. Just don’t want to burn her up.
If anyone can tell me how to place a manual gauge on this yanmar 150 hp turbo diesel I would appreaciate it.
I can do it with help but have never had a yanmar.
Thanks to all for the help.
Old Jim in Orange beach al

 

[knotflying]

There was a service bulletin related to an erroneous low oil pressure alarm. Your symptom could be related to that if the bulletin was not taken care of. It requires grounding of the sensor and the swapping out of the telex module with a software upgrade.
In the meantime oil pressure obviously is important. I doubt you have a bad pump and it is either the bulletin issue or a bad sending unit. I would first check the sensor. You will have to remove the top engine panels and the sensor is on the starboard side on top near the front of the engine. You can see it on the side below the panel without removing the panel.
Remove the wires on top of the sensor start the engine and put an ohm meter on the terminals as you increase RPM resistance should go up. Zero PSI would be about 10 ohms and at the high end 87 PSI you should be at about 124 ohms. These are all plus or minus numbers. If you are getting fluctuation then you know the sensor is working and so is your pump. If you are not getting a reading then you may still have a bad sensor or pump. The sensor can be removed and you can install a temporary mechanical gauge and confirm that your pump is good. If it is a bad sensor then a replacement is in order. If all checks out okay then it is the bulletin issue.
When removing the top panels you have to remove the port panel first and then starboard. There are also two small bolts on the front of the panels that can be felt, but not necessarily seen. This is not the esiest job, but definitely not the worst. If you want a copy of the service bulletin e-mail me mrizzo8743@aol.com and I will send it to you.

 

[Scottfree]

When you find the original oil sending unit you could remove it and install a brass T allowing a second cheap auto type oil gauge To be installed. Most auto stores have them for $20. The auto gauge use a 12 volt sending unit so the gauge can be anywhere you can get wire to. I have an second oil gauge and a tach under the hood of my hot rod for piece of mind while tinkering and it looks cool.

Good luck!