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1977 85 hp javelin water flow issues

R

rubber09

New member
First, Thank you for any help you might offer. The Javelin is a double tube pick up system. With the lower unit removed, I can hook a water hose to the right side tube and the left discharges with a full hard stream. I can hook to the left side and only a slow small amount of water discharges from the right tube. Do I have a blockage or is there a check valve or something I don't know about?
 
The two tube setup...... Water goes up only one tube. the other tube is a recycling tube back into the water pump when the thermostat is closed. What you have encountered by trying to force water up the 2nd tube is normal.
 
Water dierters can cause blockage.----Head gaskets can be installed wrong.------How long have you owned this motor ?
 
Just bought it.-----Not an unexpected answer.-----With outboards sometimes you do buy a problem motor.-----That is why the question was asked.----Check the water diverters ?-----Perhaps do a compression test.-----A blown head gasket can cause overheating.
 
joereeves said:
The two tube setup...... Water goes up only one tube. the other tube is a recycling tube back into the water pump when the thermostat is closed. What you have encountered by trying to force water up the 2nd tube is normal.
Click to expand...
Thank you!! That's the information I needed so badly. I can complete my new water pump installation with a clear mind now.
 
One bank running hotter than the other bank?.... Read on.................

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(Water Deflectors)
(J. Reeves)

Water deflectors are actually lengths of 3/8" outside diameter rubber hose, installed between the top cylinder and any cylinder beneath it, and also between the bottom cylinder and the block. The purpose of the deflectors is to have the water follow a definite path around the cylinder walls. Unfortunately the deflectors between the cylinders will at times swell sideways due to either a previous bad overheating problem, or simply due to age and salt corrosion. This causes a water flow restriction which usually allows the water to cool sufficently at low rpms but not at the higher rpms.

This hose material can be purchased reasonably at any automotive parts type store if you care to make your own, or you can purchase individual deflectors at any Evinrude/Johnson dealership at a somewhat higher cost.

Removing and installing them can be a hassle at times, but not always. I use a sharply pointed scribe with about 1/4" of the tip bent at a right angle whereas I can reach in, jab the tip sideways into the rubber, then yank it out. It's necessary to clean the seating surfaces where the ruber contacts the block with a small rat tail file to eliminate salt deposits etc. When installing the new rubber deflector, coat the deflector and the metal surfaces with WD40 which will act as lubrication to allow it to go in as easily as possible.

Make sure that you insert something into that deflector area before cutting and installing the deflectors if you make your own so that you will be certain that they are the right length and also that they will be seated properly. Usually a very small amount will be left extending about the block sealing area..... simply cut the excess off with a single edge razor blade.

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