350 mercurser sitting 5 yrs ran before frozen how can i free it

[delsol]

hi i got a glastron boat with a 350 gm motor been sitting a long time..is it possible to free up the engine???it looks ok in the valve are motor not to rusty...rust in dip stick ..i am going to put liquid wrench in the clys. then if it gets free do a major flush..any advice
bob

 

[Silvertip]

Re: 350 mercurser sitting 5 yrs ran before frozen how can i free it

IF it's been siezed for five years it would make a good anchor. Even if you do get it free, it will likely destroy itself in a very short time. However, nothing ventured, nothing gained. Just don't venture far from the dock. If you get it loose, don't try to start it immediately. Do an oil change, remove the distributor and then run the oil pump with a drill to lub the bottom end. Then reinstall the distributor and see what happens.

 

[bjcsc]

Re: 350 mercurser sitting 5 yrs ran before frozen how can i free it

If "rust in dip stick" means on the dipstick I might suspect it was put away full of water. I wouldn't spend anything on it other than time...

 

[KrisHall]

Re: 350 mercurser sitting 5 yrs ran before frozen how can i free it

Liquid Wrench is one item...I know some old timers that have used two other items to unlock the rings of old farm tractors...

1. Diesel sprayed in cylinders.
2. Alcohol sprayed in the cylinders.

Just a couple other options if the liquid wrench does not do the trick.

Just an observation but if you got rust on the dipstick water/moisture may be in the crankcase from rain/condensation...and if that is the case it may not be the rings that is froze up...may be the main and rod bearings...

Like the guy said...Don't take it far from the ramp.

 

[KrisHall]

Re: 350 mercurser sitting 5 yrs ran before frozen how can i free it

When you launch, don't forget 2 things.

1. Pull your bilge plug.
2. A cell phone to call your insurance agent. :devil:

 

[imported_rosco]

Re: 350 mercurser sitting 5 yrs ran before frozen how can i free it

agree with chief.

rusty dipstick a good indicator it has or had water in the oil. even if you get it free, the problem that caused the water to get into the oil is probably still there, usually pinhole leak in the heads over exhaust ports or bad risers / manifolds.

rings are probably rusted to the cylinder walls because of the water intrusion. even if you get them free, the rings will be destroyed as well as the cylinder walls.

boat anchor. welcome to the bane of inboard boat owners. fortunatly, the 5.7 is one of the least expensive engines to replace. cheaper than a v6 even. can get a new long block for under 3k, and an entire engine for under 5k. and before you start crying, keep in mind a base big block is going for 10 to 12k now. 6 to 7k for a long block.

 

[KRS]

Re: 350 mercurser sitting 5 yrs ran before frozen how can i free it

I've heard of using marvel mystery oil in the cylinders... and let 'em sit for a while, them refill, etc.

Valve seals prolly dried up. Main seal prolly dried up.

If'n it were me, I'd disassemble and rebuild if the machine shop said the cylinders were in good order.

 

[delsol]

Re: 350 mercurser sitting 5 yrs ran before frozen how can i free it

thanks all. i might just over the winter out together a total rebuld and do a swap when weather breaks.most wont agree i run on river water. i got my buddu 5 yrs ago a rebuilt gm car engine for 1160.00 and it still runs great on a 21ft silverline..the dealer is a nice guy he said. block is hd..oil pump is hd. timing chain is hd..gastets are marine all said it to bad.. i get get a rebuilt gm motor for 1500.00 from gm but i know. ITS A CAR MOTOR.I KNOW
thanks all bob

 

[tashasdaddy]

Re: 350 mercurser sitting 5 yrs ran before frozen how can i free it

i tried to get a 4.3L going, last year. what a pain in the A$$. sold it.

 

[mtnrat]

Re: 350 mercurser sitting 5 yrs ran before frozen how can i free it

thanks all. i might just over the winter out together a total rebuld and do a swap when weather breaks.most wont agree i run on river water. i got my buddu 5 yrs ago a rebuilt gm car engine for 1160.00 and it still runs great on a 21ft silverline..the dealer is a nice guy he said. block is hd..oil pump is hd. timing chain is hd..gastets are marine all said it to bad.. i get get a rebuilt gm motor for 1500.00 from gm but i know. ITS A CAR MOTOR.I KNOW
thanks all bob

No not car motor, TRUCK motor. repeat, TRUCK motor if you are going that way. A longblock marine is hardly any more and ready to add on the bits you already have.

 

[bucky7680]

Re: 350 mercurser sitting 5 yrs ran before frozen how can i free it

I restore old trucks. I use 1 part Marvel Mystery Oil, ! part diesel fuel and 1 part ATF fluid. Fill each cylinder to the top and wait. After 1 week try to turn the crank. I have had motors that were stuck for 20+ years free up with this mixture. Some times it take several weeks. Even if the engine frees up the rings can be unseated and it will burn oil. I agree even if you get it going how dependable will it be?

 

[delsol]

Re: 350 mercurser sitting 5 yrs ran before frozen how can i free it

bucky .i agree with you it and it can be done it would probably get worse quick unless you are lucky.. i have a fiend who over the winter wants to help me rebuild it. he has 18+ yrs has a mgr. in a big engine shop and can save me some money . but after weighting out all the things involved. the boats a 89 glastron carlson css 19ft. with nice trailer org. owner. hull has solid floors and can clean up nice...i was looking on the internet in south fla. where i lived before i see nice shop with really fair long block i am heading there today for 10 days vacation. i talked to the owner today 1 yr watt. marine engine total rebuilt. if the shop has nice motors i will get one..if i order it now i wont be home for shipping to receive it..his shop is 45 minutes from where i live
bob