Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-16-2009, 10:26 PM   #1
Lt. JG
 
Join Date: Aug 2009
Posts: 32
Default water temperature

well im kinda concerned on my engine temp..me and my wife spent a weekend on our beautiful maxum 2400scr...well the boat plans beautifully..cruises at around 3800rpm and temp gauge is just under 175...however sometimes with the same revs the temp is just above the 175 mark...i then lower the revs to around 3400K and get back to 3800K and temp is at a steady 175..if i rev her up to 4000K, temp starts creeping up very very slowly..mechanic told me to keep her at 4000revs to see whether the alarm goes off however im concerned of doing any damage..new thermo..risers..manifolds..however no luck..all hoses ok and no leeks...compression very good on all cylinders..could there be some water restriction somewhere else? mechanic did some checks by removing hoses to see the amount of water coming out and he says that all looks good....engine 5.7 V8 carb thunderbolt ignition.

Any advice on some other checks i can do myself without any more mechanic bills?!

Thanks
__________________

clint is offline   Reply With Quote
Old 08-16-2009, 11:04 PM   #2
Lt. Commander
 
Join Date: Feb 2008
Location: Notts UK
Posts: 186
Default Re: water temperature

It would have to get really hot to do some damage

Even if the alarm goes off if will be fine as long as you come back down to Idle

Has the impeller been changed in the leg?
__________________

__________________
Gaz
Gazjen is offline   Reply With Quote
Old 08-17-2009, 08:28 AM   #3
Lt. JG
 
Join Date: Aug 2009
Posts: 32
Default Re: water temperature

impeller changed as well..however i was told that a bad impeller will overheat the engine even at idle..last saturday had eight people on board and engine ran at 2200rpm (obviously not on a plane) for around 30mins and temp gauge on 160 all the time :?

engine symptoms with 2 adults and full tank of gas and water...
cruising at 3600 - 175
cruising at 3800 - 175
cruising at 4000 - just above 175 however it starts climbing really really slowly that is when i get down to 3800 again and temp is at a steady 175

really appreciate any suggestions..
clint is offline   Reply With Quote
Old 08-17-2009, 05:51 PM   #4
Admiral

 
ss3964spd's Avatar
 
Join Date: Jul 2009
Location: Fairfax Va
Posts: 1,512
Send a message via Yahoo to ss3964spd
Default Re: water temperature

It would have to get real hot to do any harm Clint and it's not unusual at all for temp to climb a bit when the engine is under more load. You don't mention how hot it's gotten though.

Run it. It will likely creep to 180, 185. If it approaches 190 you might want to look into it. My 2400 SC3 with 350 MAG and B3 runs consistantly right around 175 and creeps to maybe 180 when working hard. Remember though, there are differences between temp senders and gauges - calibration wise. The only way to really know the true temp is to shoot various hoses and engine parts with a thermo gun and compare that to the gauge.

Dan
ss3964spd is offline   Reply With Quote
Old 08-17-2009, 06:25 PM   #5
Admiral

 
seapuppy's Avatar
 
Join Date: Nov 2005
Location: Everett Wa
Posts: 4,681
Default Re: water temperature

what they said....the other place to look is in the heat exchanger..make sure that there are no blockages going on there....may need a coat hanger straighened out to push thru the tubes to make sure they ar eclear...but other than that..sounds pretty normal...


SP irate:
__________________
Don't compare your life to others. You have no idea what their journey is all about.
------------------------
SSN683 Association member
Par Excellence
------------------------------
2008 Bayliner 340 - "Wild Whim"
--------------------------------------
I live in my own little world....but it's okay-they know me here!!!

Avid practitioner of the martial art: KLIK-PAO.
Tap-Rack-Bang

Anyone that sez "Size doesn't matter" has never owned a boat!
seapuppy is offline   Reply With Quote
Old 08-17-2009, 08:41 PM   #6
Lt. Commander
 
Join Date: Feb 2008
Location: Notts UK
Posts: 186
Default Re: water temperature

I wouldn't worry about it until the alarm goes off I've just worked out 180f is only 82 Celsius 200f is only 93 I think its fine.

Isn't the stat usually a 180f one?

It sounds fine to me, like I said worry about it when the alarm goes off, that is what its for
__________________
Gaz
Gazjen is offline   Reply With Quote
Old 08-17-2009, 11:23 PM   #7
Lt. JG
 
Join Date: Aug 2009
Posts: 32
Default Re: water temperature

gaz - temp on gauge when at 4K rpms is in the middle of the 175 mark and the next mark which i thnk would be around 190. nevertheless alarm does not sound but i will let it run on 4K longer next time im out and see what happens..i will let u know on the outcome..

Sp - does a raw water cooled engine have a heat exchanger?
clint is offline   Reply With Quote
Old 08-18-2009, 12:24 AM   #8
Admiral

 
seapuppy's Avatar
 
Join Date: Nov 2005
Location: Everett Wa
Posts: 4,681
Default Re: water temperature

no...freshwater cooled only...so if you don't have FWC system...then about the only thing that can cause the engine to get hot at WOT is a bad pump ....or ....blocked passages and hoses...or ......bad thermostat....

SP irate:
__________________
Don't compare your life to others. You have no idea what their journey is all about.
------------------------
SSN683 Association member
Par Excellence
------------------------------
2008 Bayliner 340 - "Wild Whim"
--------------------------------------
I live in my own little world....but it's okay-they know me here!!!

Avid practitioner of the martial art: KLIK-PAO.
Tap-Rack-Bang

Anyone that sez "Size doesn't matter" has never owned a boat!
seapuppy is offline   Reply With Quote
Old 08-18-2009, 11:39 AM   #9
Lt. JG
 
Join Date: Aug 2009
Posts: 32
Default Re: water temperature

SP - The water pressure coming out of the engine is good..i disconnected the hose coming from the engine into the thermostat and started the engine. At idle the water pressure seemed ok to me...would that elimiate a faulty water pump or is there another check i can do? thermostat..manifolds..risers have all been changed...could there be a restriction when the water exists the risers?

another quick perhaps silly question..im checking all the fluids..engine manual states that there is the engine oil..power stearing oil..outdrive gear oil and transmission oil..can anyone tell me where i can find the transmission oil on a V8 5.7lt Carb ?

Really appreciate your help guys..
clint is offline   Reply With Quote
Old 08-18-2009, 08:05 PM   #10
Lt. Commander
 
Join Date: Feb 2008
Location: Notts UK
Posts: 186
Default Re: water temperature

There isn't any transmission oil that's your leg oil

I really do think you are worrying about nothing, wait till the alarm sounds and then take action you are spending money for nothing
__________________

__________________
Gaz
Gazjen 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Question, re: Generators and inverters T.A. Sarles Engines 7 05-03-2008 02:33 AM
Plumbing work on 2000 SCR 3000 John Gaworecki Maxum Owners General Discussions 1 04-15-2008 03:39 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 02:26 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.