|
|
03-11-2012, 06:22
|
#1
|
Marine Service Provider
Join Date: Oct 2009
Location: In the U.S.
Boat: FP Tobago 35 [sold]
Posts: 426
|
2GM20F Temperatures
Does anyone know what the correct engine temperature should be on this engine?
Since I have no temp gauge, will be using an infrared laser to check the engine temp.
Should I be checking the heat exchanger or the block itself for the best check? I assume they should be about the same.
Thanks!
__________________
Mark ( It's Irie - Sailing Blog)
The Wirie AP+ and The Wirie pro - Long Range Marine WiFi and 2/3/4G Systems
|
|
|
03-11-2012, 06:50
|
#2
|
cruiser
Join Date: Aug 2011
Location: Tampa Bay area
Boat: Hunter 31'
Posts: 5,731
|
Re: 2GM20F Temperatures
Quote:
Originally Posted by kiltym
Does anyone know what the correct engine temperature should be on this engine?
Since I have no temp gauge, will be using an infrared laser to check the engine temp.
Should I be checking the heat exchanger or the block itself for the best check? I assume they should be about the same.
Thanks!
|
I have a temperature gauge (and the same engine). My engine runs consistently at 160 degrees. I understand that's a little low but the mechanic assures me it's hot enough. Even running it up to red line, the temp doesn't vary, to the point that I wondered if it was really reading ...
until two days ago.
We were moving my boat to its new location, and a lot was going on ... and I forgot to open the seacock.
After we'd been underway a few minutes I looked at the exhaust -- and she wasn't pumping water! Since the engine is barely a year old and I had very recently changed the impeller, I realized -- the seacock was closed. I have just started doing that routinely and haven't put a hook by it yet for the keys ...
Looked at the temp gauge and it was up to 180. So I had multiple clues, passed the helm over to my friend, went below and opened the seacock, and within five minutes the temp was back down to 160.
Oh I take that back I have a 3ym, not 2. On my old engine, which had major overheat problems, I tried a laser heat gun and found that it was really hard to read the same spot each time. If you're going to go that route, I suggest that once you've found the hottest spot, which you can use the gun to do, you mark it, so you read the same spot each time.
|
|
|
03-11-2012, 07:16
|
#3
|
Registered User
Join Date: Sep 2009
Location: Houston
Boat: ‘01 Catana 401
Posts: 9,626
|
Re: 2GM20F Temperatures
I would suggest you shoot at something like the thermostat housing. The heat exchanger is likely to be cooler than engine temp, and sections of the block may not have coolant in them. The thermostat housing is where the thermostat regulates the temperature from anyway.
Just a wild guess, that engine should run between 160°F and 180°F under load.
|
|
|
03-11-2012, 07:45
|
#5
|
cat herder, extreme blacksheep
Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 18,967
|
Re: 2GM20F Temperatures
my 2qm20h runs at 130-140 f. they run cool, as per my yanmar dealer/distributor in san diego. i dont know running temps for fresh water cooled yannies, but i am sure your yannie man does.....
|
|
|
03-11-2012, 07:55
|
#6
|
Registered User
Join Date: Dec 2008
Location: Oriental, NC
Boat: Mainship Pilot 34
Posts: 1,461
|
Re: 2GM20F Temperatures
I just shot my 3gm30f (same engine, one more cylinder) with an IR gun at wot rpm. Realize that water temps here in Oriental have nosedived recently and were in the mid to upper 50s.
The temperature at the water pump housing stabilized at about 180 after running 5 minutes at wot. It probably would have been 200 or so at normal summertime water temps.
The temp immediately dropped to 160 or so when I backed off to low cruise speed.
David
|
|
|
03-11-2012, 09:52
|
#7
|
Registered User
Join Date: Sep 2012
Location: Virginia, up river from Chesapeake Bay
Boat: Cape Cod Shipbuilders Bullseye
Posts: 106
|
Re: 2GM20F Temperatures
It has been several years since I owned a 2GM20F, but it seems to me that it was suppose to run pretty warm with fresh water, like 185. They are made differently than the raw water cooled engines which are suppose to run much cooler. The best place to test the water temperature is where the sensor is located, right on top of the thermostat housing. You can pick up a sensor with a gauge to test it.
|
|
|
03-11-2012, 17:09
|
#8
|
Eternal Member
Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
|
Re: 2GM20F Temperatures
To give you a picture....aim the gun at the intake line and then at the line leading to the exhaust elbow.....that will give you coolant temp and differential
|
|
|
03-11-2012, 17:39
|
#9
|
cruiser
Join Date: Aug 2011
Location: Tampa Bay area
Boat: Hunter 31'
Posts: 5,731
|
Re: 2GM20F Temperatures
Quote:
Originally Posted by CCBullseye
It has been several years since I owned a 2GM20F, but it seems to me that it was suppose to run pretty warm with fresh water, like 185. They are made differently than the raw water cooled engines which are suppose to run much cooler. The best place to test the water temperature is where the sensor is located, right on top of the thermostat housing. You can pick up a sensor with a gauge to test it.
|
Mine (new engine, only about a year old) has never run to 180 except the other day when I forgot to open the seacock. 160 is what I get consistently, all the time, at all RPM's. I've paid attention to it because I had such major overheat problems with the old engine... oy vey!
|
|
|
03-11-2012, 18:22
|
#10
|
Moderator Emeritus
Join Date: Aug 2005
Location: Carlsbad, CA
Boat: 1976 Sabre 28-2
Posts: 7,505
|
Re: 2GM20F Temperatures
Is the engine salt water cooled or freshwater cooled through a heat exchanger. If its salt water cooled, it should be run under 150 degrees to keep salt from cystalizing and blocking the cooling passages. A freshwater cooled engine should run hotter but probably less than 200 degrees
__________________
Peter O.
'Ae'a, Pearson 35
'Ms American Pie', Sabre 28 Mark II
|
|
|
04-11-2012, 04:29
|
#11
|
Marine Service Provider
Join Date: Oct 2009
Location: In the U.S.
Boat: FP Tobago 35 [sold]
Posts: 426
|
Re: 2GM20F Temperatures
Quote:
Originally Posted by Rakuflames
Mine (new engine, only about a year old) has never run to 180 except the other day when I forgot to open the seacock. 160 is what I get consistently, all the time, at all RPM's. I've paid attention to it because I had such major overheat problems with the old engine... oy vey!
|
I appreciate the info but as you stated, you have a different engine.
__________________
Mark ( It's Irie - Sailing Blog)
The Wirie AP+ and The Wirie pro - Long Range Marine WiFi and 2/3/4G Systems
|
|
|
04-11-2012, 04:31
|
#12
|
Marine Service Provider
Join Date: Oct 2009
Location: In the U.S.
Boat: FP Tobago 35 [sold]
Posts: 426
|
Re: 2GM20F Temperatures
Quote:
Originally Posted by roverhi
Is the engine salt water cooled or freshwater cooled through a heat exchanger. If its salt water cooled, it should be run under 150 degrees to keep salt from cystalizing and blocking the cooling passages. A freshwater cooled engine should run hotter but probably less than 200 degrees
|
It's freshwater cooled.
Thanks everyone for your responses, all helpful.
__________________
Mark ( It's Irie - Sailing Blog)
The Wirie AP+ and The Wirie pro - Long Range Marine WiFi and 2/3/4G Systems
|
|
|
04-11-2012, 04:37
|
#13
|
Marine Service Provider
Join Date: Oct 2009
Location: In the U.S.
Boat: FP Tobago 35 [sold]
Posts: 426
|
Re: 2GM20F Temperatures
Quote:
Originally Posted by Chief Engineer
To give you a picture....aim the gun at the intake line and then at the line leading to the exhaust elbow.....that will give you coolant temp and differential
|
Intake line of the seawater or the coolant into the heat exchanger?
And what would this differential show me?
The hose leading to the elbow is the "warmed" sea water. If I measure the seawater intake it will tell me the temp difference but not sure what this value really tells me, except that some amout of heat is going out the exhaust.
__________________
Mark ( It's Irie - Sailing Blog)
The Wirie AP+ and The Wirie pro - Long Range Marine WiFi and 2/3/4G Systems
|
|
|
04-11-2012, 05:30
|
#15
|
cruiser
Join Date: Aug 2011
Location: Tampa Bay area
Boat: Hunter 31'
Posts: 5,731
|
Re: 2GM20F Temperatures
Quote:
Originally Posted by kiltym
I appreciate the info but as you stated, you have a different engine.
|
Sorry, I thought we had the same one. I read 20, not 30.
|
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Rate This Thread |
Linear Mode
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Advertise Here
Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
Vendor Spotlight |
|
|
|
|