water pressure gauge pegged when turning

[countvlad]

i was trimmed half way on the trim gauge doing about 4500-5000 rpms.. looked at the gauge and the pressure pegged... once i got back on straight it went back to 20 psi.... i didnt see doing this any other time...

is it because the water inlet on the lower unit is taking water+air?

 

[gss036]

Re: water pressure gauge pegged when turning

Depending on the motor, the water pressure line usually comes off the top of the block. Has nothing to do with speed pick on the lower unit. I would suggest you check the small hose that runs from the engine to the gauge to see if you can tell if it is crimping along the way from the motor. The gauge actually works off of air pressure, the water pushes the air forward in the line and does not reach the gauge.

 

[Randybeall]

Re: water pressure gauge pegged when turning

Not knowing what type of power you are talking about I will speak in general diagnostic terms. You have some type of problem, to peg the guage something is blocking the exit flow of cooling water. You should study the manual on that engine or outdrive if that is what it is and determine the exhaust flow of cooling water. If the pressure rises that much there is no flow, and the water must keep moving to cool the engine. If it only occures for a few seconds and only when making the occasional turn there will likely be no damage. If it is an outdrive and there are hoses involved in the coolant exhaust I would expect a burst hose soon because it is folding closed instead of bending. Hope this will give you some idea of where to look for this problem.

 

[countvlad]

Re: water pressure gauge pegged when turning

Not knowing what type of power you are talking about I will speak in general diagnostic terms. You have some type of problem, to peg the guage something is blocking the exit flow of cooling water. You should study the manual on that engine or outdrive if that is what it is and determine the exhaust flow of cooling water. If the pressure rises that much there is no flow, and the water must keep moving to cool the engine. If it only occures for a few seconds and only when making the occasional turn there will likely be no damage. If it is an outdrive and there are hoses involved in the coolant exhaust I would expect a burst hose soon because it is folding closed instead of bending. Hope this will give you some idea of where to look for this problem.

teah tnx sounds good.... it is not intermitent, its only when i turn... i kinda assumed it is because the impeller is not taking any water while turning.... i wish i could watch the motor/lower unit turning but i cant put my life in fiances hands

yes it is an outboard: 1989 120 Johnson

tnx