Engine overheated, made a grinding noise, and seized. GM 350 engine

[jim9601]

I was cruising at about 3200 RPMs and the engine overheated, made a grinding noise then seized up. Does anyone have an idea of what may have happened? I'm hoping that I can repair it without having to pull the motor out of the boat, but know how my luck is with easy repairs. Thanks, Jim

 

[MarkSee]

Re: Engine overheated, made a grinding noise, and seized. GM 350 engine

I remember reading similar posts and determining whether it is the engine itself or the outdrive is the best place to begin if you're saying it still won't start now.

Remove the drive and see if it kicks over or not.

Mark

 

[Fishermark]

Re: Engine overheated, made a grinding noise, and seized. GM 350 engine

Remove the spark plugs too in case it is hydrolocked. If any water comes out of the cylinders, you will need to address that situation ASAP.

 

[jim9601]

Re: Engine overheated, made a grinding noise, and seized. GM 350 engine

Thanks for the advice, sounds like great places to start. Will keep you posted as to the outcome, Jim

 

[RogersJetboat454]

Re: Engine overheated, made a grinding noise, and seized. GM 350 engine

Did you also take note of what the oil pressure was when the ship hit the fan?

 

[Bondo]

Re: Engine overheated, made a grinding noise, and seized. GM 350 engine

Ayuh,.... Check the contents of the fuel filter for water, 'n crud too....

A lean condition coulda detonated it...

 

[tpenfield]

Re: Engine overheated, made a grinding noise, and seized. GM 350 engine

​if it is the outdrive, then the engine can probably stay in the boat . . . If it is the engine, it is coming out.

 

[dingdongs]

Re: Engine overheated, made a grinding noise, and seized. GM 350 engine

pull drive off and split and check if waterpump is there in one bit,this will prove if it was water related.
is there oil in the engine?
if its still not cranking after a day its an engine replacement out of a truck or buy a new one from michigan motorz and just switch ancillaries.
maintenance is the key and avoiding it proves costly as your about to see.

 

[dingdongs]

Re: Engine overheated, made a grinding noise, and seized. GM 350 engine

pull drive off and split and check if waterpump is there in one bit,this will prove if it was water related.
is there oil in the engine?
if its still not cranking after a day its an engine replacement out of a truck or buy a new one from michigan motorz and just switch ancillaries.
maintenance is the key and avoiding it proves costly as your about to see.