Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-01-2017, 01:13 PM   #1
Guru
 
DHeckrotte's Avatar
 
City: Philadelphia, PA
Vessel Name: Revel
Vessel Model: 1984 Fu Hwa 39
Join Date: Nov 2015
Posts: 1,024
Perkins 6.354 overheat episode.

Dumb question for the day:

So, out for a joyride on Barnegat Bay, turning 1800 rpm and doing 8kts, calm waters and not much wind. Driving from the flybridge, so cannot watch gauges. After running perhaps an hour, the starboard engine temp alarm sounded. I went down to the helm position and the starboard engines' temp was about 235; the port was a little over 190. Starboard's oil pressure was lower than the port's. I throttled back to idle and put the trans in neutral, thinking that coolant flowing was a good thing. I opened up the floor and went back to see if the starboard had begun cooling down; but no perceptible change. Shut it down. Climbed down into the ER looking for guilty signs. None: coolant in the overflow, water in the strainer, alternator/pump belt intact, no coolant smell, no oil smell, no water or coolant spraying around.

Restarted the starboard engine, in neutral and at idle, and went to see if there was water coming out the exhaust. Can't see either side since the swim platform blocks the view and waves are dancing around.

Went back to the helm and see that the water temp is falling and the light/sounder are quiescent. Put in gear and gradually raise the RPM, temperature continues to drop. Back to 1800 RPM and the temperature drops to normal. Ran gradually up to 2000 and then 2200 RPM; temperature stays normal for the 10 remaining minutes to the Marina's entry channel. Oil pressure came back up to normal as the engine temp fell to normal.

What happened? Did I pick up a plastic bag on the external strainer which dropped off when I shut down?
__________________
Advertisement

DHeckrotte is offline   Reply With Quote
Old 09-01-2017, 01:34 PM   #2
Guru
 
Gabe n Em's Avatar
 
City: Wickford, RI
Vessel Name: Volans
Vessel Model: 2001 PDQ MV 32
Join Date: Jan 2015
Posts: 563
low oil pressure could just be due to the warmer oil. as it heats, it flows easier (reduced viscosity?) and pressure falls.

as to your overheat issue, sounds like something suctioned to the intake that dropped off when you shut it down. (jellyfish, bag, etc)
__________________

Gabe n Em is offline   Reply With Quote
Old 09-01-2017, 04:00 PM   #3
Guru
 
City: Montgomery, TX
Vessel Name: Encore
Vessel Model: Whitby 42
Join Date: Feb 2012
Posts: 818
Why no gauges on the flybridge?
BobH is offline   Reply With Quote
Old 09-01-2017, 06:04 PM   #4
Guru
 
High Wire's Avatar
 
City: Cape May, NJ and Englewood, FL
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 3,917
Wawa bag.
__________________
Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May NJ
High Wire is offline   Reply With Quote
Old 09-01-2017, 06:08 PM   #5
Guru
 
jleonard's Avatar
 
Join Date: Jun 2008
Posts: 4,249
Quote:
Originally Posted by BobH View Post
Why no gauges on the flybridge?
Exactly
__________________
Jay Leonard

New Port Richey,Fl
jleonard is offline   Reply With Quote
Old 09-01-2017, 07:04 PM   #6
Guru
 
Lepke's Avatar
 
City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 2,337
Something blocked the intake and was released when the engine stopped. I've seen a piece of plastic film stop a diesel driven jet. Sea grass and kelp is also common blocker.
Lepke is offline   Reply With Quote
Old 09-01-2017, 07:57 PM   #7
Guru
 
Gabe n Em's Avatar
 
City: Wickford, RI
Vessel Name: Volans
Vessel Model: 2001 PDQ MV 32
Join Date: Jan 2015
Posts: 563
Maybe check that impeller when you get a chance. Might have burned up a little
Gabe n Em is offline   Reply With Quote
Old 09-01-2017, 09:44 PM   #8
Guru
 
DHeckrotte's Avatar
 
City: Philadelphia, PA
Vessel Name: Revel
Vessel Model: 1984 Fu Hwa 39
Join Date: Nov 2015
Posts: 1,024
Re: gauges on the FB. The Perkins panels supplied with this boat are much simpler than those below. Got a tach, the four idiot lights and alarm sounder, and a couple push buttons. I presume stop and start but w/o a key, why would you want to stop the engine and not be able to silence the alarm?
DHeckrotte is offline   Reply With Quote
Old 09-01-2017, 10:33 PM   #9
FOG
Guru
 
FOG's Avatar
 
City: Wilmington, NC
Vessel Name: DreamQuest
Vessel Model: Prairie 36
Join Date: Jan 2016
Posts: 550
Sounds like something blocking the intake as others have said.

I keep a laser heat gun on board for back-up.
FOG is offline   Reply With Quote
Old 09-02-2017, 06:32 AM   #10
Guru
 
boomerang's Avatar
 
City: Kilmarnock VA
Vessel Name: YellowBird
Vessel Model: 1978 Mainship 34
Join Date: Apr 2016
Posts: 885
I guess you had better not proclaim it cured until you run it for another hour since you only ran it for 10 minutes on the way back to your marina & it took an hour for the alarm to sound.
With all of the improvements you've made to your boat, add to your to-do list a set of gauges to the bridge!
__________________
-Shawn-
boomerang is offline   Reply With Quote
Old 09-04-2017, 04:47 PM   #11
Guru
 
DHeckrotte's Avatar
 
City: Philadelphia, PA
Vessel Name: Revel
Vessel Model: 1984 Fu Hwa 39
Join Date: Nov 2015
Posts: 1,024
Well, ran yesterday for about three hours, no issue, rock steady temperature. Today, overheated after about 45 minutes, and despite shutdown and restart, never cooled down to 'normal'.

Time to open up some pumps... I paid for new impellers on both engines and both raw and coolant pumps in the spring. About 50 hours on those impellers, presuming I actually got them.

Sheesh!
DHeckrotte is offline   Reply With Quote
Old 09-04-2017, 04:54 PM   #12
Guru
 
jleonard's Avatar
 
Join Date: Jun 2008
Posts: 4,249
Check the cams that squeeze the impeller. They wear out and the pumps don't pump the volume they should.
If they are old I'll bet they are worn out.
__________________
Jay Leonard

New Port Richey,Fl
jleonard is offline   Reply With Quote
Old 09-04-2017, 06:31 PM   #13
Guru
 
boomerang's Avatar
 
City: Kilmarnock VA
Vessel Name: YellowBird
Vessel Model: 1978 Mainship 34
Join Date: Apr 2016
Posts: 885
Odd ,how it overheats intermittently. It may well be the raw water pump since it was just serviced. Maybe an intake hose collapsing. Have you scrutinized the fresh water side of the system? It could be as simple as a sticky thermostat.
__________________
-Shawn-
boomerang is offline   Reply With Quote
Old 09-05-2017, 11:04 PM   #14
Guru
 
Edelweiss's Avatar
 
City: PNW
Vessel Model: 1976 Californian Tricabin LRC
Join Date: May 2011
Posts: 1,860
Quote:
Originally Posted by DHeckrotte View Post
Well, ran yesterday for about three hours, no issue, rock steady temperature. Today, overheated after about 45 minutes, and despite shutdown and restart, never cooled down to 'normal'.
Sheesh!
If not the thermostat or collapsed hose and assuming your pump is delivering enough water, it could be a system blockage. Check the hoses between the raw water pump to oil cooler and to heat exchanger. Squeeze them with the engine off, so you know how they feel, then start the engine, run it up a bit and squeeze them again. If they're rock hard or swollen, then you have a blockage down stream from where you're squeezing. Could be anywhere in the circuit all the way to the exhaust elbow. If its not a range 4 engine, you should have a bronze crossover pipe between the heat exchanger and exhaust manifold across the top of the engine above the bellhousing. They get plugged with a build up of sediment over time. Has the exhaust elbow water injection ports been clean recently?
__________________
Larry B
Careful . . .I Have a Generator and I'm not afraid to use it !
Edelweiss is offline   Reply With Quote
Old 09-09-2017, 12:25 PM   #15
Guru
 
kapnd's Avatar
 
City: hawaii
Vessel Name: #31
Vessel Model: ex-Navy MUB 50 fish/cruise
Join Date: Aug 2013
Posts: 708
Debris leftover from previous impeller shreddings can cause havoc on the INTAKE side of the raw water pump between the raw water strainer and the pump.
Pieces that take up residence there get plastered against the pumps intake grate, but fall away when the engine is shut off, so you don't see any blockage when you look at the pump.
This can cause mysterious and intermittent overheat when the rest of the system checks out perfectly.
__________________

__________________
You can lead a horse to water,
But you can't make him ski...
kapnd is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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



» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 01:34 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×