My 1989 8hp Evinrude outboard telltale water drops off when you rev the motor up?

Question

Have cleared the telltale line back to the cooling jacket - the motor starts and idles well - there is plenty of water flow at low idle but when you rev the motor up the water flow drops right off and some exhaust fumes come out the telltale - when you back the revs off the water flow returns - could it be the impellor or head gasket gone, letting the exhaust fumes back into the cooling jacket?

Answer 1

It is very possible that the impeller could pump ok at idle, but not pump enough at WOT. Sometimes the hub will spin inside the impeller just like they can in a prop. Before you tear into your engine try changing the water pump as a kit. New housing, wear plate, impeller, and gaskets. If that doesn't fix it try removing the thermostat, and run the engine momentarily with the t-stat cover off to verify water flow to the engine. That will tell you whether you need to go low or go high in your search.

Answer 2

If you are getting exhaust in the water jacket, something is definitely wrong such as a head gasket or a crack somewhere.

Actually it sounds like you have 2 problems. If your impeller was good, your water pressure would pick up with rpms and overpower the exhaust leak.

My guess is a bad impeller has caused overheating, that resulted in a blown head gasket or a crack.

Answer 3

1st hope you are not running the engine on a pair of water ears cause reving up with running off of a water hose you will be buy a new outboard...... if you are running it in the water sound like a hole in the line or a cracked head gasket if it was the impeller no water would flow out but i would start with the tale tell ,line thermostat, impeller,and them the head gasket

Answer 4

First take the thermostat out an inspect it . or replace it. there is a by pass hole that plugs in time an if the stat doesn't open than no water flow??Impeller next . If running good doubt if you have internal problems.

Answer 5

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Answer 6

Could be either, or the exhaust tube could have a small hole in it. Either way, it could damage your engine from overheating due to not enough coolant (water) flowing at higher speeds.