please help. boat overheated. need advice
 

Hello and thanks for looking. I have a four Winns liberator. It has a 260 HP 350. It overheated today on the lake. Was smoking quite a bit. I let it cool down and babied it to the dock. Boat began running very weak all of a sudden which is how I discover the overheating. I could hear water boiling in the exhaust. After cooling boat started and made it back to dock. But with no power. Wouldn't even plain off. I checked the oil for water and there is no water in it . any help appreciated thank you.

The 'lucky' minimum by your description is head gaskets. Do a compression test. 4/6 and or 3/5 are prob leaking combustion into each other.

totally agree with this comment by SB

If that engine got that hot to start smoking-- not good at all.

you may want to look in the bilge and see if there is any substantial water -- cracked the block, manifold etc.

I wish you all the best


3pointstar

And I would not re use the risers and the exhaust manifolds on a repower / rebuild. This most likely is close to a 27 to 30 year app having a Mercruiser in it. Also IF APPLICABLE - the exhaust Y pipe will need to be check out very closely and 4 sure change the heart shape O ring gasket at the bottom flange to the inner transom assembly. So many people miss that one after a hard overheat doing the repower / rebuild . Just saying. IMO I think the motor is hurt internally in some shape or form like others have posted

Thank you guys. I will be doing a compression test tomorrow. The motor was already tired before only having 100lbs per cylinder. I'll post tomorrow let ya know what I come up with. Anyone off hand know the firing order? Its a 1986.

1-8-4-3-6-5-7-2

Every guy should know those numbers more than their own b-day, right behind Jenny's number. :)

Agreed!! FYI, BB Chevy's have same firing order.
Good luck with the diagnosis, as you probably know, this place is a wealth of knowledge and "entertainment".

OK here is the test real quick what is a marine GM base small block with reverse rotation firing order ? there is a very simple simple way to remember this if you do not know it but know the standard firing order.

Reverse firing order is 8-6-7-5-3-0-9.

Sounds like you have a great opportunity to upgrade to a 383... btw unless youre hung like john holmes its hard to pick up hot chicks with only 260hp.... just my .02...rm

Not as simple as it used to be [ATTACH=CONFIG]540837[/ATTACH]

what would be interesting does anyone have a phone number like 1- 843-6572--- obviously with different area codes??

3pointstar

Hahaha it I fill that thing full of beautiful women. Just wait till it has 600hp hahahaha:D

Well guys compression test showed good compression all cilynder s. One cylinder blew water out of the compression gauge tho haha! Time to pull her and put something a little more radical in there. Anyone know where to get a cheap low miles or rebuilt SBC or BBC near phoenix az?

Depends on what you call cheap.

Over on this side of the country, I believe DonziMatt has a sweet low hr 383 with AFR heads for sale.

Pretty sure my firing order goes with this '86 350 in question. Thus why I didn't give the firing order for Fords, Mopars........ stay on track. :D

Thats the ticket, afr heads are nice, u. Can run more comp with alum heads and beat on it harder, plus it will have a marine cam grind in it... which wl save u the time and money of buying and swapping cams. if u buy a hipo car motor which its almost always gonna have too much cam for a marine app... rm

Heres another tip, sell ur old motor on ebay in parts, block, crank, pitons and rods, break it all down it will bring a lot more coin that way to help pay for a much more manly engine package...rm

That's a great idea!!! Thank you. Def be good to part out what I can:D

Stay with the small block dude, it isnt worth the coin with what u have to go nuts putting a bbc in it, you would have to buy tons of new stuff, a 383 will feel like a bbc after what ur pulling out of it!

Engine (new) was in an old 22' Hammond Challenger with an Alpha SS and just touched 80MPH.

Yup, good stuff.

Edit in: I bought the SS and 2-3 props (all beautiful) off that boat. LOL. DonziMatt got the engine.

Ya I believe your right. SBC running good be sweet. My old one was 260hp but tired with 1000 hours on it.I imagine it was closer to 200hp. A fresh motor 350-400 HP prolly be night and day difference.it did 52mph with the tired motor. Hopefully get 70/w 400 HP

it might go close to 70 if you dont have any fat girls in it...just my .02...rm

52 is pretty good top end for what engine youre running, you using speedwax?

I bet you have a cracked head or block.....

100 psi is low.

It had 100 psi before this. It's just old lol

first you change the water pump in the drive and find out if the overheat problem is fixed. phoenix AZ. no salt i take it. so rotted out intake manifold, etc is less likely but still a possibility. get the junker motor holding temp before you put a new one in there...

i thinks its a 100 psi a hole across the board.... as in shot out

That's ignorant.

X2. install a water pump kit when u do the motor swap... its pointless to spend a few hundred bucks on a shot out engine... youll get a lot of advise on oso and MOST will be good advise....

for instance if its gonna break u buying a stout 383, buy a decent plane jane 350, with the money you save buy a ton of hershey kisses!

you can pick up just as many fat girls with hershey kissss as you can with an extra hundred ponies...

ps. remember to buy some butter to grease their hips. it will make it essier to push em through the doorway to your bedroom...xoxo rm

Hahahahha hahahaha hahahaha

NFC!!!!
no fat chicks

Hahahaha