Reply
 
Thread Tools Display Modes
 
Old 06-23-2013, 03:06 PM   #1
Senior Member
 
Gulfstar 36's Avatar
 
City: Kent Island
Country: USA
Vessel Name: Sundowner
Vessel Model: Gulfstar 36 MrkII
Join Date: Jul 2012
Posts: 226
Perkins 4.236 running hot

We just got back from a 3 day cruise and my stbd engine was running hot. We normally run about 1900RPM but the stbd engine now at this temp seems to over heat. The gauge was over 200 before I noticed it and backed off on the RPMS. Running at 1600 the temp maintains 180. The port engine never goes higher than 170 at any RPM. Once we arrived I noticed green AF in the bilge but the only way that could have gotten there was from the overflow at the fill cap. I added about 3 quarts to the port engine. Both engines appear to have the same water flow from the exhaust.

Where should I start?

Thanks
__________________
Advertisement

Gulfstar 36 is offline   Reply With Quote
Old 06-23-2013, 07:24 PM   #2
Senior Member
 
Gulfstar 36's Avatar
 
City: Kent Island
Country: USA
Vessel Name: Sundowner
Vessel Model: Gulfstar 36 MrkII
Join Date: Jul 2012
Posts: 226
I meant to say added 3 quarts to the Stbd engine.
__________________

Gulfstar 36 is offline   Reply With Quote
Old 06-23-2013, 08:24 PM   #3
TF Site Team
 
FlyWright's Avatar
 
City: California Delta and SF Bay
Country: Sacramento, CA, USA (boat in Vallejo)
Vessel Name: FlyWright
Vessel Model: Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 10,178
Has anything else changed recently on the stbd engine? Recent maintenance?

I'd start with the raw water pump impeller inspection/replacement. Any missing blades? Any lost pieces impeding flow downstream? If that's all good, how's the coolant pump?

If you can place a small container under the coolant overflow line, you can verify if that's the source of coolant in the bilge and not a failed hose or radiator cap.
__________________
Al

Custom Google Trawler Forum Search
FlyWright is offline   Reply With Quote
Old 06-23-2013, 08:50 PM   #4
TF Site Team
 
Pineapple Girl's Avatar
 
City: San Mateo, CA
Country: USA
Vessel Name: Pineapple Girl II
Vessel Model: PT 35
Join Date: Jun 2010
Posts: 2,165
This happened to a friend and he'd sucked a bunch of plant life in that was clogging his intake. He found that AFTER he changed the impeller to no avail.
__________________
-Jennifer
Pineapple Girl II 1984 PT 35
San Francisco Bay Area
www.pineapple-girl.blogspot.com
Pineapple Girl is offline   Reply With Quote
Old 06-23-2013, 09:23 PM   #5
JAT
Guru
 
JAT's Avatar
 
Country: US
Vessel Name: Just a Tinch
Vessel Model: Gulfstar 44 MC
Join Date: Jan 2010
Posts: 595
When was the last time you cleaned the heat exchanger? You could have a problem there. If the water flow is restricted...she'll heat up at higher RPM's.

Defective thermostat? As in not opening properly.

I don't know that much about the 4.236, my engines are 6.354's, and the only other item I can think of engine wise would be a restriction in the oil/raw water cooler a part that might look like this if you have them. Sen-Dure - PERKINS Oil Coolers
JAT is offline   Reply With Quote
Old 06-24-2013, 12:21 AM   #6
Member
 
City: Courtenay BC ,canada
Country: Canada
Join Date: Feb 2013
Posts: 14
Send a message via Skype™ to driller66
perkins 6 cylinder

Hi folks!! I've actually got a question about my Perkins 6 cyl. that I'd appreciate your feedback and ideas on . Starts up in the morning cold and idles nicely at 600-700 RPM, after 15 or twenty minutes when she's warm the idles up to 1000 and never goes down below. I'm suspecting the injector pump. Any ideas or other suggestions? Many thanks in Advance for your time, experience and wisdom!!
Peace
driller66 is offline   Reply With Quote
Old 06-24-2013, 12:25 AM   #7
Guru
 
City: Carefree, Arizona
Country: usa
Vessel Name: sunchaser V
Vessel Model: DeFever 48
Join Date: Apr 2008
Posts: 6,363
Quote:
Originally Posted by driller66 View Post
Starts up in the morning cold and idles nicely at 600-700 RPM, after 15 or twenty minutes Peace
Why do you idle so long?
sunchaser is offline   Reply With Quote
Old 06-24-2013, 07:36 AM   #8
Senior Member
 
Gulfstar 36's Avatar
 
City: Kent Island
Country: USA
Vessel Name: Sundowner
Vessel Model: Gulfstar 36 MrkII
Join Date: Jul 2012
Posts: 226
I guess the best thing for me to do would be to try to wrestle the heat exchanger off and ether clean it or replace it. The engine is 38 years old and I'm sure that are not in the best shape. It is just that this one is on the hull side of the engine and a real bear to get to. Does anyone know if the exhaust manifold has to come off? Also how hard is it to get to the thermostat?

Thanks
Gulfstar 36 is offline   Reply With Quote
Old 06-24-2013, 08:17 AM   #9
Scraping Paint
 
City: Fort Lauderdale
Vessel Model: CHB 48 Zodiac YL 4.2
Join Date: Oct 2007
Posts: 3,804
Quote:
Originally Posted by Gulfstar 36 View Post
I guess the best thing for me to do would be to try to wrestle the heat exchanger off and ether clean it or replace it.
Before you literally open a can of worms, circulate a cleaning medium through the raw water side and see what that does.

There are plenty of web posts showing how to do it yourself and if you are not so inclined, find a fellow boater who can help. It isn't too difficult - it's much easier and less risky than wrestling parts off on spec.
RickB is offline   Reply With Quote
Old 06-24-2013, 08:28 AM   #10
Senior Member
 
Gulfstar 36's Avatar
 
City: Kent Island
Country: USA
Vessel Name: Sundowner
Vessel Model: Gulfstar 36 MrkII
Join Date: Jul 2012
Posts: 226
Something like method 2 in this post? It looks like my flow goes like this. Raw water pump > Oil cooler > Heat exchanger > Exhaust manifold > Mixing elbow. I assume this mixture is OK for all parts in this path?


How to Service Your Yacht's Cooling System



Quote:
Originally Posted by RickB View Post
Before you literally open a can of worms, circulate a cleaning medium through the raw water side and see what that does.

There are plenty of web posts showing how to do it yourself and if you are not so inclined, find a fellow boater who can help. It isn't too difficult - it's much easier and less risky than wrestling parts off on spec.
Gulfstar 36 is offline   Reply With Quote
Old 06-24-2013, 11:33 AM   #11
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,524
I would start with closing the seacock , pulling the hose and opening the seacock.

LOTS!!?? of water continue the process thru the engine .
FF is offline   Reply With Quote
Old 06-25-2013, 11:55 AM   #12
Veteran Member
 
2DASEA's Avatar
 
Join Date: Dec 2011
Posts: 78
I would pull exchanger, should be done regularly for cleaning and inspecting. A good radiator shop can help. !'ve pulled lots of old impeller pieces out of heat exchangers.
2DASEA is offline   Reply With Quote
Old 06-25-2013, 12:05 PM   #13
Veteran Member
 
2DASEA's Avatar
 
Join Date: Dec 2011
Posts: 78
Another idea, check elbow in cooling loop they get corrosion that closes them up and restricts flow....
2DASEA is offline   Reply With Quote
Old 06-25-2013, 02:00 PM   #14
Senior Member
 
Gulfstar 36's Avatar
 
City: Kent Island
Country: USA
Vessel Name: Sundowner
Vessel Model: Gulfstar 36 MrkII
Join Date: Jul 2012
Posts: 226
Thanks! This is the hard one to get to, so I'm going to try a few in place fixes first then remove it for replacement or cleaning during the off season.
Gulfstar 36 is offline   Reply With Quote
Old 06-30-2013, 05:01 PM   #15
JAT
Guru
 
JAT's Avatar
 
Country: US
Vessel Name: Just a Tinch
Vessel Model: Gulfstar 44 MC
Join Date: Jan 2010
Posts: 595
Quote:
Originally Posted by driller66 View Post
Hi folks!! I've actually got a question about my Perkins 6 cyl. that I'd appreciate your feedback and ideas on . Starts up in the morning cold and idles nicely at 600-700 RPM, after 15 or twenty minutes when she's warm the idles up to 1000 and never goes down below. I'm suspecting the injector pump. Any ideas or other suggestions? Many thanks in Advance for your time, experience and wisdom!!
Peace

My 6.354's after warming up...do the same thing. I do believe its art of the "anti-stall" mechanism...or something like that. I generally idle my engines for only a few minutes before using the engines. But I do not think there is anything wrong with the injector pump. I have two 6.354's....and they both do it.
JAT is offline   Reply With Quote
Old 07-03-2013, 10:33 PM   #16
Senior Member
 
Gulfstar 36's Avatar
 
City: Kent Island
Country: USA
Vessel Name: Sundowner
Vessel Model: Gulfstar 36 MrkII
Join Date: Jul 2012
Posts: 226
So I'm running out of options. Impeller looks OK, I flushed the HE with acid but still getting hot. I'm thinking may a stuck thermostat. I'm getting good flow out the exhaust. But I noticed the fresh water tank gets hot but the raw water line that goes to the mixing elbow does not. this would seem to be a lack of exchanged heat. I assume that if the thermostat was stuck shut fresh water would never reach the heat exchanger? Who knows where the thermostat is on a Perkins 4.236?
Gulfstar 36 is offline   Reply With Quote
Old 07-04-2013, 01:06 AM   #17
Guru
 
rochepoint's Avatar
 
City: Sidney BC
Country: Canada
Vessel Name: Rochepoint
Vessel Model: 1985 Cheer Men PT38 Sedan
Join Date: Apr 2009
Posts: 1,191
Google is your friend, I found this shop manual on the net at:
http://igor.chudov.com/manuals/Perki...hop-Manual.pdf

It is a big 8.4 meg download so it will be a little slow downloading but should help.........
__________________
Cheers Mike Barge
MV Rochepoint
Sidney, British Columbia.
"Yes, I have the right anchor"
rochepoint is online now   Reply With Quote
Old 07-04-2013, 08:19 AM   #18
Senior Member
 
Gulfstar 36's Avatar
 
City: Kent Island
Country: USA
Vessel Name: Sundowner
Vessel Model: Gulfstar 36 MrkII
Join Date: Jul 2012
Posts: 226
Not a very good document for the M series engines. I suspect it is under the coolant tank. I do have a hard copy of the workshop manual for the 4.236M but it does not identify it's location. I head over there in a little while and scope it out.



Quote:
Originally Posted by rochepoint View Post
Google is your friend, I found this shop manual on the net at:
http://igor.chudov.com/manuals/Perki...hop-Manual.pdf

It is a big 8.4 meg download so it will be a little slow downloading but should help.........
Gulfstar 36 is offline   Reply With Quote
Old 07-14-2013, 04:56 PM   #19
Senior Member
 
Gulfstar 36's Avatar
 
City: Kent Island
Country: USA
Vessel Name: Sundowner
Vessel Model: Gulfstar 36 MrkII
Join Date: Jul 2012
Posts: 226
Well I finally got out today for a few hours. The temp never went over 180 after an hour at 1900 where I normally run. I think it might have been the second muriatic acid flush after the phosphoric one. I did also see a kink in the exhaust hose that I straightened out somewhat.
Gulfstar 36 is offline   Reply With Quote
Old 07-14-2013, 06:45 PM   #20
Senior Member
 
Join Date: Feb 2012
Posts: 134
great
__________________

expat is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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





All times are GMT -5. The time now is 07:50 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012