1970 EVINRUDE 4HP MODEL # 4036 Overheating problem :(

athlon_oved

Recruit
Joined
Jul 11, 2001
Messages
3
sorry for the repost...<br /><br />I just bought this motor about 3 weeks ago. At first it took me about 10-20 pulls to get the motor cranked. I took to a local boat dealership/servicing place and they found that the carburetor needed rebuilt. After I got the motor back today I took it out and it cranked on the second pull. It ran great for a while, probably 10-20 minutes or so. Then the motor over heated and shut off. After it cooled down I cranked it again, needless to say it shut off after a few minutes. After I got it back home I took it to my shop pulled the foot off of it to see if it was the impeller. It seemed to be all right, but I’ve heard just because it looks new doesn’t mean a thing. As I was inspecting the impeller I noticed a small gap between the impeller and the wear plate at the bottom. The gap looks to be around .001 to .004 thousands wide. Is this normal? <br /> Also I hooked up a small hose to the little tube that runs up to the motor block and tried to blow through the tube to see how easy it was. There was quite a bit of resistance. Is this normal?<br /><br /> I hope that I have explained myself good enough for someone to help me. I'm new to these things and any help would be greatly helpful.<br /><br /> The water comes out of the same 2 rows of holes that the exhaust comes out of.
 

12Footer

Fleet Admiral
Joined
Mar 25, 2001
Messages
8,217
Re: 1970 EVINRUDE 4HP MODEL # 4036 Overheating problem :(

Remove the thermostat and try getting water thru it again. Install a new t-stat. Do not trust the old one.
 

joejoe

Seaman
Joined
Aug 14, 2001
Messages
50
Re: 1970 EVINRUDE 4HP MODEL # 4036 Overheating problem :(

where is the thermostat located on this engine. i did not even know they had one.
 

Chinewalker

Fleet Admiral
Joined
Aug 19, 2001
Messages
8,902
Re: 1970 EVINRUDE 4HP MODEL # 4036 Overheating problem :(

There is no Thermostat on the 4hp models. Is there any sealant between the wear plate and the gear housing? They'll suck air sometimes if that's not sealed up.<br />- Scott
 

joejoe

Seaman
Joined
Aug 14, 2001
Messages
50
Re: 1970 EVINRUDE 4HP MODEL # 4036 Overheating problem :(

thx scott i did not think they had a thermostat.
 
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