|
|
|
|
| Author |
|
|
Registered
Join Date: Dec 2002
Location: Dahlonega , Georgia
Posts: 14,643
|
30 hp outboard overheating
Trying to get the new to me 1987 Johnson outboard running. Today I removed/rebuilt the carb with OEM carb rebuild kit. I did this because for the last week or so when I went to start her she would fire but wouldn't stay running. Removed the carb and soaked her in cleaning solution for 30 minutes. Blew compressed air though all the passages and buttoned her up. Primed it and turned the key she fired right up and ran good for about 2 minutes and then the overheat buzzer went off I turned her off. I was running it with muffs and a garden hose, has a splatter of water coming out but not a stream. The water pump impellar/housing was just replaced two weeks ago. Assuming I did the water pump correctly do I have a stuck thermostat or plugged passages ?
__________________
2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
||
03-29-2013, 03:36 PM
|
|
|
Registered
Join Date: Jun 2000
Location: bottom left corner of the world
Posts: 22,764
|
Umm, it should be a stream.
|
||
|
03-29-2013, 03:41 PM
|
|
|
Serial Lurker
Join Date: Oct 2005
Location: Mount Vernon WA
Posts: 1,252
|
My money is on plugged passages. I had a 1978 'Rude that had a similar issue. I pulled the heads and cleaned everything. Replaced the gaskets, thermostats, impeller and lower unit seals and oil. Turned around and sold it to a friend who still uses it today.
Most O/B motors that I have seen of this type have a pretty simple thermostat block. It's a few bucks and a half hour to swap thermostats and gaskets out. I do believe that the water would still be pumping, just not being directed into the passages if your T-stats were failing closed. I really do think you need to look at your water passages.
__________________
Does anyone know where the love of god goes when the waves turn the minutes to hours? |
||
|
03-29-2013, 03:44 PM
|
|
|
UnRegistered User
|
Impeller the water pump?
The little rubber impeller on some outboards gets chewed up sometimes. Edit. Should read all of the previous posts....
__________________
Bill K. "I started out with nothin and I still got most of it left...." 83 911 SC Guards Red (now gone) And I sold a bunch of parts I hadn't installed yet. |
||
|
03-29-2013, 08:11 PM
|
|
|
RETIRED
|
Best bet the impeller, easy R&R......usually some wanker ran it w/o water.
__________________
1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
||
|
03-29-2013, 08:28 PM
|
|
|
Registered
Join Date: Dec 2002
Location: Dahlonega , Georgia
Posts: 14,643
|
Quote:
__________________
2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
||
|
03-30-2013, 02:05 AM
|
|
|
|
Registered
Join Date: Oct 2003
Location: London Ont Canada
Posts: 3,120
|
some outboards won,t draw water properly thru muffs. I wouldn,t look much further until I ran it in a barrel (a garbage pail will work) .
__________________
1980 911 SC 3.6 coupe sold 1995 993 coupe 1966 Mustang Shelby clone 1964 Corvair Spyder Turbo gone 2012 Boss 302 |
||
|
03-30-2013, 02:34 AM
|
|
|
Registered
Join Date: Jul 2008
Location: New Jersey
Posts: 8,910
|
Quote:
|
||
|
03-30-2013, 02:51 AM
|
|
|
?
Join Date: Apr 2002
Posts: 30,493
|
Add Mariner 150s to the list...I only run on muffs long enough to get her fired prior to a trip (a cold natured beast after storage). Barely get a decent stream...does fine in the water...nature of the beast...
|
||
|
03-30-2013, 06:56 AM
|
|
|
Registered
Join Date: Mar 2008
Location: Fla panhandle / Roaming in my motorhome
Posts: 4,332
|
You could check for obstructions in the water outlet line. Used to get chunks of sand blocking the line right where it connect to the nipple where it goes through the shroud.
Does sound like lack of cooling water flow. Lime out may help to break up salt/corrosion blockages in the passages. Thats where I would start looking next. Then back to the search for the perfect fishing gear. Pipe cleaners just came to mind. Cheers Richard |
||
|
03-30-2013, 07:05 AM
|
|
1983 Porsche SC
Da cab
