200 hp overheating

[72harley1000]

"I have a 1980 200hp johnson t

"I have a 1980 200hp johnson that was overheating on the starboard bank. there was good water flow on the port bank, but a slow flow on the starboard side I removed the bottom unit and replaced the impeller, which was defective( all the blades were there, but it was hard and they were not the least bit flexible). The water tube got damaged on the reinstall, necesitating that I remove the powerhead to replace the water tube. I started to put it all back together, and before I put the power head back on, I attached a hose to the water tube to check for any leaks. I had good flow out the top, with no leaks that I could detect, but the water was only coming out the port side on the part that the powerhead mates to. I put the engine back together, and put it in the water to run it, and now it is still overheating, and I have no water flow to the starboard bank. I am stumped, and the admiral thinks I should just dump the engine over the side. I hate to give up on it, as the engine runs exceptionally well, except for this overheating.
I guess one of my questions is, should the water be coming up both sides of that plate? I think one of the hole is for a return, as it appears that it goes to a hole in the front of that plate that is open to the lower leg. I don't have any idea where the other chamber goes. I looked at a schematic at my dealers, but the illustration is of such poor quality that even he can't make out items.
Thanks for any help."

 

[joereeves]

"Assuming that you have new th

"Assuming that you have new thermostats installed and the bypass valves are operation (not damaged), I would supect the water deflectors.

(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.

When time permits, visit my store (copy/paste) at: http://stores.ebay.com/Evinrude-Johnson-Outboard-Parts-etc?refid=store"

 

[72harley1000]

"thanks for your response.
I

"thanks for your response.
I don't know if that is the problem, as I am not getting any water flow on the starboard bank, with the thermostat cover removed. before I took everything apart, i had a weak flow on that bank under similar circumstances. I took everything apart, and had to make my own gasket for the 2 parts that are where the water tube attaches. I only took that apart because when testing that entire unit, there was water coming out of a gap in the rear of that assembly, and I assumed there was a problem. It turns out for some reason some water is supposed to come out there. Any way, as I said earlier, water only comes out of the port side of the plate the powerhead mates to. Is that normal, or am I supposed to get water flow out of both sides. If that is normal, I need to know how to get at these water deflectors.
Thanks"

 

[london marine]

"You need to remove the cylind

"You need to remove the cylinder head to inspect / replace the water deflector / guides.As for the water supposing to to leak somewhere on a powerhead, I think you need to read up and think about that as in my opinion that is a NO-NO."

 

[72harley1000]

"thanks for the reply.
the wa

"thanks for the reply.
the water was not leaking on the powerhead, but on a casting that was 2 units down from the one that the powerhead is bolted to. it is definitely a casting, and the water channel goes to it, so I supposed that for some reason it was a relief of some sorts. I still don't know if water is supposed to be flowing up to the powerhead on both the port and starboard sides. Do you know the answer to that question?
Thanks again,
Frank"