Mounting Evinrude 4HP as auxillary

C

Cyberplod

Recruit
Joined
Feb 5, 2008
Messages
1
Hi,

I have bought a barely used '84 Evinrude 4HP 2-stroke to use as an auxillary on my river cruiser (a blocked diesel filter convinced me that a backup is always a GOOD thing!)

Engine runs great in the tank and I have a sprung transom bracket ready to fit.

I am an absolute beginner with outboards and have the following, probably dumb, "newbie" question:

How far below the waterline should the cavitation plate sit? I notice that the engine has three holes in a vertical line on the shaft - should these be above or below the waterline? I have quite a bit of leeway as the boat is aft cockpit and has a fairly low transom.

Thanks,

Steve
 
tashasdaddy

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: Mounting Evinrude 4HP as auxillary

assume you have an adjustable spring bracket (sprung). when operating the small motor, the flat plate above the prop (anti-ventilation plate) should be even and in line with the bottom of the boat.
 
Silvertip

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: Mounting Evinrude 4HP as auxillary

The engine needs to be low enough so the water pickup is below the water line. Postion of the AV plate is not a factor here since it will not plane the boat anyway. Mount it any one of the many available outboard mounting brackets that allow you to raise the engine vertically out of the water when not in use.
 
X

Xcusme

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Apr 21, 2003
Messages
2,888
Re: Mounting Evinrude 4HP as auxillary

Cyberplod said:
Hi,

I notice that the engine has three holes in a vertical line on the shaft - should these be above or below the waterline?

Thanks,

Steve
Click to expand...

Those are idle relief exhaust holes and should be above the waterline...they should spray a fine mist when motor runs...it helps verify that the water pump is working.
 
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