Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-24-2019, 02:34 PM   #1
Lt. JG
 
The Pirate's Avatar
 
Join Date: Jul 2017
Location: Austin, TX
Posts: 39
Default Overheating at idle

Bought an older boat, which was poorly maintained, and I've been in the process of bringing it up to speed. Boat is an '06 1800 SR3 with 4.3 ltr. When purchased, engine always ran at perfect temp, I watched that like a hawk when first shaking it out. Gauge never moved off of 175f.
I wanted to have impeller changed as I could see that outdrive had never been off boat, not a scuff mark on it.
Had local guy do it to tune of about $400. Since getting it back, and a lot of use this summer, engine temp will spike at idle. Warning signal comes on, temp gets up toward 185f. Usually, just a shift to neutral and add some RPM and temp will drop quickly.
But annoying in that this didn't happen previously. I'm not understanding why this would happen with new impeller. Could this be a thermostat issue? I just don't want to throw money at what is a pretty simple, but annoying problem.
Any thoughts....thanks.
__________________

__________________
2006 Maxum 1800 SR3
2002 Stingray 180LX (sold)
1996 Bayliner Capri (sold)
1959 Cruisers, Inc. Seafarer (sold)
The Pirate is offline   Reply With Quote
Old 08-24-2019, 03:29 PM   #2
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,351
Default

I would perform a flow test per the Mercruiser manual where you remove the hose at the thermostat housing that comes from the transom plate and collect the water in a bucket to verify amount of water at a certain rpm for a given time. I suspect the guy that did the job didnít get a good seal between the pumps output and upper water tube.
__________________
1997 2400 SCR
5.7 Vortec / Bravo 2
Mike
mmwjr 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


Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 04:19 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.