75 evinrude overheating

7

75 gypsy

Recruit
Joined
Feb 9, 2008
Messages
5
Just bought 1975 Gypsy w/ Evinrude 115 hp, a warning horn went off from the throttle box....any ideas on what the problem can be?? and how to fix it?

First time boat owner
 
HighTrim

HighTrim

Supreme Mariner
Joined
Jun 21, 2007
Messages
10,486
Re: 75 evinrude overheating

When was the impeller last changed? If you are unsure, or it has been a couple years, it is time. They should definately be changed every 2 to 3 years. Cheap part, but its failure is catastrophic. I would probably change the t stats and poppets while I was at it as well, flushing out the water line.
 
E

ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: 75 evinrude overheating

1. Replace the water pump; use a whole new kit, not just an impeller;

2. Make sure the water screens at the water intake below the water pump are in good shape and that the circuits are clear;

3. Renovate the parts inside the thermostat housing and the thermostat;

4. Check the water deflectors.

Edit: Purchase a model-specific OMC factory service manual. Go ebay.com and search 260043298936 before it sells.
 
7

75 gypsy

Recruit
Joined
Feb 9, 2008
Messages
5
Re: 75 evinrude overheating

How can I find instructions on how to do this?

Forgot to put plug in, took boat out of water and let drain, put in plug, then went back into water but bildge pump never came on.
 
E

ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: 75 evinrude overheating

See edit on my earlier entry. The horn on the 1975 control is strictly an overheat alarm.

When the plug is left out, it is always your brother in law's fault. These rules are strictly enforced.
 
7

75 gypsy

Recruit
Joined
Feb 9, 2008
Messages
5
Re: 75 evinrude overheating

Boat was sitting for about 3 months. Is this water pump expensive and is it possible that overheating came from gas and oil not being mixed thoroughly? if so, still need to change pump?

thanks for all the help
 
E

ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: 75 evinrude overheating

I would not risk the engine on that issue. Oil and gas mix quickly on their own. Trailering the boat for a few miles is enough.
 
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