87' Suzuki DT4, pumps water at idle, quits with throttle

sjey

Recruit
Joined
May 16, 2004
Messages
2
I got it cheap. It was used by the previous owner in salt water without flushing it every time. It idles and runs great but didn't pump any water at first. I opened the lower unit and pump to made sure that the inlet and the pump are not blocked. Used a wire aswell as a small manual pump and managed to get a chunk of salt/debris out of the inlet tube. Now at idle it always pumps a slow stream of water out of the pee-hole. I ran it for over 10 mins at idle to flush other salt buildups in the engine block.<br /><br />The problem is whenever I give some throttle, water stream out of the pee-hole dribbles becomes a spary and then quits. It looks like the centrifugal action is not generating adequate outlet pressure because the impeller is weak and flexes too much to the center. Am I correct in my judgement and will changing the impellar fix this problem? Also can you please comment on how fast should be the water stream out of the pee-hole. If someone with a similar <6 hp engine could say like it takes about X minutes to fill a gallon at idle and Y minutes at 1/2 throttle that will be great info.<br /><br />I am new to outboards, learnt a good deal from this forum and the service book from the library. Thanks to everyone for the wonderful comments in this forum.<br /><br />jey
 

phatmanmike

Captain
Joined
Oct 24, 2003
Messages
3,869
Re: 87' Suzuki DT4, pumps water at idle, quits with throttle

check your thermostat if you have one, it could be restricted. i always recamend to my customers that they change the impellar whenever they get a "new" motor, cause you never know when the previous owner did it. its cheep insurance<br /><br />m ikey
 

jim dozier

Lieutenant Commander
Joined
Jan 8, 2003
Messages
1,970
Re: 87' Suzuki DT4, pumps water at idle, quits with throttle

You should drop the lower unit and replace the water pump impeller. You should do this on any used engine that you aren't sure of the age of the water pump and yours shows signs of age. Evaluate the flow once you have repaired the cooling system.
 

sjey

Recruit
Joined
May 16, 2004
Messages
2
Re: 87' Suzuki DT4, pumps water at idle, quits with throttle

I replaced the waterpump components, impellar, gasket, rubber gromet and the metal plate facing the impellar aswell as the gear case oil. It pumps water at all settings of the throttle now. Also noticed the increase in the volume of water being pumped. Can't wait to try out in the lake. Thanks!<br /><br />jey :)
 
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