free me i'am seized twice

[twkjr 1250]

just got boat with two seized 4cylinder 1977 mercs i/o not sure of model . guy told me both motors were rebuilt 6 years ago and never used boat. what is the precejure for unseizing them really need your help because i'am stuck

 

[Bt Doctur]

Re: free me i'am seized twice

start by pulling the drives, still wont turn, then pull the heads

 

[wire2]

Re: free me i'am seized twice

1 trick I've heard about is to pull the plugs, pour a cup of diesel in each hole, let it sit for a few days, then try to turn it over.
Personally, I'd be inclined to spray a bunch of PB Blaster in each hole, a couple times a day for a few days, then try to turn it.

 

[jerryjerry05]

Re: free me i'am seized twice

I always use Marvel Mystery Oil.Diesel fuel will work too.Put it in the cylinders and let it set for a couple of days.Keep adding as needed.
Then hook up 2 batteries and have a go.A breaker bar on the front will help.J

 

[artificialreef]

Re: free me i'am seized twice

I like Transmission fluid in the spark plug holes, (remove all the plugs) pour a couple of capfulls. sit for a day, rock it a little with a breaker bar on the crank, let it sit some more. Then turn it with the breaker bar and cross your fingers. I got a car sitting for 4 years running like that. Ran for another 100,000 miles. Got it from my deceased great aunt that stopped driving for 4 years. If you remove the plugs the only resistance you will have is the rusted rings and the valve springs. Dont force it. Be gentle and patient.

 

[spdracr39]

Re: free me i'am seized twice

I always use Marvel Mystery Oil.Diesel fuel will work too.Put it in the cylinders and let it set for a couple of days.Keep adding as needed.
Then hook up 2 batteries and have a go.A breaker bar on the front will help.J

Just a word of wisdom for someone not in the know. Don't use the breakover bar and the starter at the same time

 

[AdellAdam]

Re: free me i'am seized twice

Just a word of wisdom for someone not in the know. Don't use the breakover bar and the starter at the same time

Speaking from experience? That would be a great wake-up call.

 

[jerryjerry05]

Re: free me i'am seized twice

Sure would. I guess I should have said use both at different times.Someone could die like that.J