Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 17-11-2008, 14:40   #1
Registered User

Join Date: Jun 2006
Posts: 237
Universal M18 Operating Temp

Would it be considered "normal" for the subject engine to hit 210-230 if driven to almost 3200RPM? Normally, it hits around 190 when cruising at 6 knots and 2500RPM. We had a wicked current/chop in the seaway this passed weekend and had to crank her up to make decent froward progress. The engine approached 230 but quickly cooled when dropped back to 2500RPM.

I'm planning to pull the HE for some maintenance but was wondering whether 230 is considered overheating/dangerous?
__________________

__________________
drh1965 is offline   Reply With Quote
Old 17-11-2008, 16:06   #2
Registered User

Join Date: Jun 2005
Posts: 1,901
what's the diameter of the HE?
__________________

__________________
never monday is offline   Reply With Quote
Old 17-11-2008, 18:55   #3
Registered User

Join Date: Jun 2006
Posts: 237
It is a stock 2" HE.

Thanks.
__________________
drh1965 is offline   Reply With Quote
Old 18-11-2008, 04:15   #4
Registered User

Join Date: Jun 2005
Posts: 1,901
it's not big enough. Needs to be a 3" in warm waters
__________________
never monday is offline   Reply With Quote
Old 18-11-2008, 09:45   #5
Registered User

Join Date: Jun 2006
Posts: 237
Thanks Pat. Will 230 do damage eventually?

Would you use the 3" for a larger Universal or something different?
__________________
drh1965 is offline   Reply With Quote
Old 18-11-2008, 10:02   #6
Registered User

Join Date: Jun 2005
Posts: 1,901
small amounts of time at 230 won't kill it. Universal had a service bulletin about the HE sizes years ago. You should be able to get with a local dealer and look up a part # for the larger one.

then again, yours might be crunchy inside and a good cleaning could help.
__________________
never monday is offline   Reply With Quote
Old 28-07-2013, 01:13   #7
Registered User

Join Date: Jul 2013
Posts: 4
Re: Universal M18 Operating Temp

Hi,I have a Catalina 27 from 1985 also with an inboard M18. The other day, while under power, the engine kind of choked and died, leaving us adrift. I rushed down below and checked the engine compartment only to see coolant seeping (boiling) out the coolant tank cap and out the overflow tube.
Anyone have any idea what this can be due to and how to fix it? I have been afraid to start the engine up again for fear that I will damage it even more. Is it just a matter of adding coolant and starting it again?
Thanks for the help!
__________________
jaime_marian is offline   Reply With Quote
Old 28-07-2013, 04:01   #8
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,571
Images: 240
Re: Universal M18 Operating Temp

Greetings and welcome aboard the CF, jaime marian.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 28-07-2013, 06:01   #9
Registered User

Join Date: Jan 2011
Location: Sandusky
Boat: Tartan 37C
Posts: 34
Re: Universal M18 Operating Temp

Quote:
Originally Posted by jaime_marian View Post
Hi,I have a Catalina 27 from 1985 also with an inboard M18. The other day, while under power, the engine kind of choked and died, leaving us adrift. I rushed down below and checked the engine compartment only to see coolant seeping (boiling) out the coolant tank cap and out the overflow tube.
Anyone have any idea what this can be due to and how to fix it? I have been afraid to start the engine up again for fear that I will damage it even more. Is it just a matter of adding coolant and starting it again?
Thanks for the help!
This is not enough information. There are many things that could cause your Universal to overheat. Most likely would be the sea water impeller failed or the sea water intake strainer plugged. As above in the thread you could also be running at too high RPM. Tell us how you were motoring before it overheated. Was water coming out of the exhaust? Was it the normal amount?

Cheers
Kevin
__________________
sailingjazz is offline   Reply With Quote
Old 28-07-2013, 09:13   #10
Registered User

Join Date: Jul 2013
Posts: 4
Quote:
Originally Posted by sailingjazz View Post

This is not enough information. There are many things that could cause your Universal to overheat. Most likely would be the sea water impeller failed or the sea water intake strainer plugged. As above in the thread you could also be running at too high RPM. Tell us how you were motoring before it overheated. Was water coming out of the exhaust? Was it the normal amount?

Cheers
Kevin
Changed the impeller last December, and before I left, I checked the engine exhaust and everything seemed normal. I was motoring at 5 kts and 2000 rpm for 2 hrs before coolant started to bubble out of the cap. One thing that worried me is that there seemed to be some oil in the coolant tank. The previous owner told me that he had put some oil there in error thinking that it was the oil tank but when I mentioned this to a mechanic in December he didn't seem too worried about it. Should I drain the entire coolant/oil from the cooling system and start fresh? If so, how?
__________________
jaime_marian is offline   Reply With Quote
Old 28-07-2013, 17:51   #11
Registered User

Join Date: Jan 2011
Location: Sandusky
Boat: Tartan 37C
Posts: 34
Re: Universal M18 Operating Temp

Quote:
Originally Posted by jaime_marian View Post
Changed the impeller last December, and before I left, I checked the engine exhaust and everything seemed normal. I was motoring at 5 kts and 2000 rpm for 2 hrs before coolant started to bubble out of the cap. One thing that worried me is that there seemed to be some oil in the coolant tank. The previous owner told me that he had put some oil there in error thinking that it was the oil tank but when I mentioned this to a mechanic in December he didn't seem too worried about it. Should I drain the entire coolant/oil from the cooling system and start fresh? If so, how?
If you are sure that you had a good flow of water in the exhaust at the time it overheated then you have another problem. A little oil in the coolant would not be a problem. A lot of oil would be a problem. Another way oil can get in the coolant is if you have a blown head gasket. You could try draining the coolant (there is a block drain on the left side of the engine as you are facing it). http://engines1.novosolutions.net/re....asp?id=59&SID= Then replace the coolant with fresh and try again.

It could be that the oil has gummed up your heat exchanger. If so you would have to remove it and get it cleaned.

I recently had to replace the fresh water pump on my Universal. It locked up so I knew it needed replaced. But, after I replaced it the engine ran about 15deg cooler. If you take off the fan belt and try turning the fresh water pump by hand, it should turn freely. If it doesn't, it may be time to replace it.

Hope this helps. You are going to just need to eliminate problems one at a time until you figure out what is the problem.

I would verify that you have good sea water flow and that your impeller is in good condition and the sea water strainer is not clogged.

Cheers
__________________
sailingjazz is offline   Reply With Quote
Old 28-07-2013, 21:29   #12
Registered User

Join Date: Jul 2013
Posts: 4
Quote:
Originally Posted by sailingjazz View Post

If you are sure that you had a good flow of water in the exhaust at the time it overheated then you have another problem. A little oil in the coolant would not be a problem. A lot of oil would be a problem. Another way oil can get in the coolant is if you have a blown head gasket. You could try draining the coolant (there is a block drain on the left side of the engine as you are facing it). http://engines1.novosolutions.net/re....asp?id=59&SID= Then replace the coolant with fresh and try again.

It could be that the oil has gummed up your heat exchanger. If so you would have to remove it and get it cleaned.

I recently had to replace the fresh water pump on my Universal. It locked up so I knew it needed replaced. But, after I replaced it the engine ran about 15deg cooler. If you take off the fan belt and try turning the fresh water pump by hand, it should turn freely. If it doesn't, it may be time to replace it.

Hope this helps. You are going to just need to eliminate problems one at a time until you figure out what is the problem.

I would verify that you have good sea water flow and that your impeller is in good condition and the sea water strainer is not clogged.

Cheers
Thanks jazz,
Today I hand-pumped the 'coolant' out into a bucket. It looked like a thick, gummy, yellowish, very viscous substance. Then, I unclamped the hoses and dismantled the heat exchanger and cleaned it thoroughly (see pic attached, is the zinc okay by the way?). Still need to clean out the cooling circuit and get rid of all that gunk.
By the way, I am not getting a temperature reading at the instrument panel, what could be the cause?
Attached Thumbnails
Click image for larger version

Name:	image-1088890440.jpg
Views:	87
Size:	284.2 KB
ID:	64776  
__________________
jaime_marian is offline   Reply With Quote
Old 29-07-2013, 14:36   #13
Registered User

Join Date: Jan 2011
Location: Sandusky
Boat: Tartan 37C
Posts: 34
Re: Universal M18 Operating Temp

Quote:
Originally Posted by jaime_marian View Post
Thanks jazz,
Today I hand-pumped the 'coolant' out into a bucket. It looked like a thick, gummy, yellowish, very viscous substance. Then, I unclamped the hoses and dismantled the heat exchanger and cleaned it thoroughly (see pic attached, is the zinc okay by the way?). Still need to clean out the cooling circuit and get rid of all that gunk.
By the way, I am not getting a temperature reading at the instrument panel, what could be the cause?
OK, viscous and gummy are not good discriptors for coolant. So, getting rid of that and flushing out the cooling system would be good and could fix the problem. There should be a zink in the exchanger but, it is inside and you will have to remove it to see if it is OK. If the temp gauge is not getting a reading the problems could be; low coolant level, stuck thermostat, disconnected wire, bad sender, bad guage in about that order of likelyhood.
__________________
sailingjazz is offline   Reply With Quote
Old 16-08-2013, 10:02   #14
Registered User

Join Date: Jul 2013
Posts: 4
Ok, I topped off the coolant and am still not getting a temperature reading at the panel. Could it be a stuck thermostat? I tried to tinker with a wrench to unscrew it but it was stuck hard. Any ideas on how to remove it?
__________________
jaime_marian is offline   Reply With Quote
Old 16-08-2013, 11:15   #15
Registered User

Join Date: Jan 2011
Location: Sandusky
Boat: Tartan 37C
Posts: 34
Re: Universal M18 Operating Temp

Quote:
Originally Posted by jaime_marian View Post
Ok, I topped off the coolant and am still not getting a temperature reading at the panel. Could it be a stuck thermostat? I tried to tinker with a wrench to unscrew it but it was stuck hard. Any ideas on how to remove it?
I assume you mean the temp sender which is on the thermostat housing cover. If that is all rusted fast, your best bet is to remove the entire thermostat housing and soak the whole thing in penetrator oil to try to get it loose. First I would ground the wire that attaches to the gage and see if it pegs the temp gage to see if the gage and wire are good. If the gage is pegged when you ground the wire, the gage and the wire are good (likely). In that case the problem is likely either the thermostat or the sender. In either case you will likely need to remove the thermostat housing cover. If you do need to, take your time and use a lot of penetrator oil (watch out it tends to be very flammable).
__________________

__________________
sailingjazz is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Low Operating Temp drh1965 Engines and Propulsion Systems 7 07-04-2008 17:58
Volvo MD2B operating temperature?? amity Engines and Propulsion Systems 1 03-09-2007 17:47
Universal M18 drh1965 Engines and Propulsion Systems 15 27-08-2007 13:40
Operating RPMs Rippy Engines and Propulsion Systems 15 23-02-2006 05:51
Normal operating rpm Weyalan Engines and Propulsion Systems 3 19-12-2005 17:44



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 18:09.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.