high motor temp?? what's normal Yanmar 4By3 180

[johnw]

Can anyone tell me what is the normal motor temp for a 2017 Yan 180 Turbo installed in a 2012 R-27 ?
I'm getting many conflicting or ambiguous answers.
My surveyor says " according to manual 226 is an over heat"
That is quite obvious.I a m a grady-white owner for over 15 years and wanted to cruise the LOOP.
I just spent 1 k for a sea trial and survey and noticed the boat ran at 193 to 209 degrees after 70 mins at fast,slow,etc....
The boat just got a new motor in 2017 and has 80 hours on it. After one week or the install, the installer noted hot temp and took the hoses to the hot water heater and running heater and capped them to bring the temp down. Also, made the intake pipe to 1.5 inch from 1 inch.
However, Range Tug told me we don't deal with Yanmar and don't know what temp is normal?????????
Yanmar is not calling me back yet
The last motor was destroyed by a chronic over heating problem.
I would be the 4th owner since 2012
I really don't want to inherit a chronic problem and have the new motor burn out on my watch.


Any advice from actual owners would be very helpful in my decision to buy or step away

Thank you in advance for any help
John

 

[captstu]

195 is high normal.


Stuart Bell
Ranger 25: Shearwater
(561) 352-1796

 

[johnw]

Mr Bell,
what type of motor model do you have?
Thanks

 

[captstu]

I have a 4BY2 150.

 

[Brunski]

First Google hit:

http://www.shamrockboatownersclub.com/forums/threads/yanmar-temp-update.12903/

As per one of the posts there, you might want to join boatdiesel.com, and see what folks over there say. Some questions to consider: Where are you measuring the temps? How are you measuring the temps? What components were not replaced when the new motor was installed? For example, one of the posters in Shamrock Boat Owners Club had an issue with his/her intercooler...

 

[captstu]

I suggest you invest $50 at Amazon for a non-contact thermometer.

https://smile.amazon.com/gp/product/B01 ... UTF8&psc=1

Scan your engine - the exit temperature for the salt water that re-enters the exhaust elbow should be 20 degrees hotter than the entrance temp on most engine - see what your temp is and write it down.

The temp at the top of the thermostat should be between 195 and 215 after running the engine hard. Look up your thermostat rating - if your temperature is more than about 10 degrees above the rating, you likely have a recirculating water problem.

Check your temperature every month or so after a hard run - if it starts to climb, you either have a damaged impeller - you can see your salt water temp climbing - a damaged thermostat - you can see your engine temp climbing, a clogged or partially clogged heat exchanger - you can see the flow thru your sea chest reduced -- or some similar problem.

Finally, if you don't have an exhaust temperature alarm, put one on. Should your impeller fail, the alarm will sound and save your exhaust system and muffler.

It is unlikely that water overheat would cause engine damage unless your oil cooler is also failing to control the temperature of the oil. Measure it with your IR thermometer - if it gets to the 250 range, find out why.

Good luck - I have had all these problems on my current Yanmar and wish you better luck in finding and preventing them than I had.

 

[HRowland]

I have a 4BY2-180 in my 2012 R27. I see temperatures from the low 190's at low power up to about 202 at high power settings during the Summer. In early Spring with colder water the max temp is a few degrees lower. When delivering the boat to the broker in CT (from RI) the first week of May I saw 197 as the highest temperature. I was cruising at about 3300 RPM. The engine has 520 hours and an unmodified cooling system.

Yanmar uses a 190F thermostat that does not fully open until 205F.

I assume the 4BY3 uses the same thermostat.

You can try calling Mack Boring in NJ, they are the regional distributor for Yanmar. Several years ago I attended an owners class they had for the BY2 family.

Howard

 

[johnw]

thank you very much Howard 😉

 

[knotflying]

My numbers are near what Howard reports. I run usually at around 195 to 197 during normal cruise and then at WOT 206. All depends on ambient water temperature as well. With a new engine I can't see how anything engine related could be affecting heat. From my perspective, the only thing possible would be raw water intake and the hoses related to it.

 

[dalecam]

My numbers are near what Howard reports. I run usually at around 195 to 197 during normal cruise and then at WOT 206. All depends on ambient water temperature as well. With a new engine I can't see how anything engine related could be affecting heat. From my perspective, the only thing possible would be raw water intake and the hoses related to it.

I have a Ranger Tug with a 4BY2-180 in my 2011 R27. Engine also runs with the same water temperature data as described above. As a baseline we normally cruise at 14 knots, 3370 rpm, ~80% load, and see 193-194 F water temp.