question regarding Evinrude 10hp conversion from pressure tank to single line

I

ianmoore

Petty Officer 2nd Class
Joined
Jun 5, 2014
Messages
185
Hello,
I am converting my '59 Evinrude to a singleline. I am basically following this link: https://www.youtube.com/watch?v=FtG4M7ye1N8. I am using one of the simple Mikuno fuel pumps
Just double checking on two points:
1. I only need to fill the small channel going into the right cylinder in order to create the pressure..yes?
2. the check valves are left off when i reassemble?

Thanks in advance!
Ian
 
HighTrim

HighTrim

Supreme Mariner
Joined
Jun 21, 2007
Messages
10,486
I really dislike that method. I would consider leaving the intake manifold alone, plugging the old pressure line with a bolt, drilling/tapping one of your bypass covers for a barb and getting your pulse from there. Intake manifold modifications should really only be done on the smaller hp motors with non removable bypass covers.

You could also get a bypass cover and fuel pump from a later model 10hp and really make it easy.
 
I

ianmoore

Petty Officer 2nd Class
Joined
Jun 5, 2014
Messages
185
Taking a stab at this engine again in the coming months. I found a fuel pump from a '63, and a bypass cover for it
I have a couple of questions:
-There is a gasket that goes between the cover and the pump that is unavailable. Would it be ok to just use some gasket sealant there, or better to get some raw gasket material and cut it to size?
-I was trying to originally do the fuel pump conversion with the cap, so i have removed the check valves. Do i need to put these back in for any reason, or is it ok to leave them out?
Thanks!
Ian
 
HighTrim

HighTrim

Supreme Mariner
Joined
Jun 21, 2007
Messages
10,486
That gasket should still be available. I likely have a few. A good location for parts is a wanted ad at aomci.org in the webvertize. A local member will be able to help. If you mount the pump on the bypass cover, yes, return the intake manifold back to as it was.
 
F

F_R

Supreme Mariner
Joined
Jul 7, 2006
Messages
28,226
303615 gasket, bypass cover to fuel pump is available and still used today on many motors. It is about 1/8" thick, not an easy do-it-yourself.
303680 gasket (insulator) is no longer available. No big deal, it never was needed anyway. Supposedly, it is a heat shield to keep engine heat away from the fuel pump. If your engine gets hot enough for that to be a problem, you have a more serious problem than hot pump.

Yes, the check valves must be in there. If not, air will pass back and forth between the upper and lower crankcase sections and it won't run worth a hoot-----if you can even get it started.
 
I

ianmoore

Petty Officer 2nd Class
Joined
Jun 5, 2014
Messages
185
I'm glad i kept the check valves! Will reinstall.
So, that big gasket, 303680, is not needed? Good to know.
I will just order the other one. I'm looking forward to getting this engine going. I've replaced the coils and caps, rebuilt the carb, etc, but haven't had much luck with it yet.
Will keep you guys informed
 
F

F_R

Supreme Mariner
Joined
Jul 7, 2006
Messages
28,226
I've been leaving that heat shield gasket out for many years, with no ill effects.
 
C

Crosbyman

Admiral
Joined
Nov 5, 2006
Messages
6,074
presumably if both presuure channels were to be blocked off.... the possibilty of feedback will not be an issue

since you kept the valve you may as well keep the engine in a ''restorable'' mode.
 
You must log in or register to reply here.
Top