Motor seized from installing the thermostat the wrong way-gctid818574

[Chuck_Wagon]

Probably the most costly error so far for me. My engine starting smoking then a knocking sound and that's all she wrote. I was cruising at 3800 rpm. Is my motor history or can this be repaired? If not, has anyone had experience with a reconditioned/re- manufactured replacement?

Thanks In advance,

Chuck

[SomeSailor]

Well... Your motor seized from you not seeing the overtemp. How long did you operate it that way? You could have no damage at all. As the motor overheats it will start to detonate and on an MPI boat would fault out. It sounds like you missed the overheat, but did you get an alarm?

[builderdude]

I'm with Mike, there was no alarm? Is this a caburated motor or an mpi?

[Chuck_Wagon]

There was no alarm and it is a carburetor. I was running at that speed for about 15 minutes. Once it cut out I couldn't start it again and it wouldn't even crank. Running at 3800 rpm with no water getting into the engine for that period of time wouldn't that be enough for the engine to seize up? When I opened the engine hatch I saw smoke coming from the risers.

[builderdude]

Got hot enough to quit, it's likely toast, sorry dude

[Chuck_Wagon]

I also believe that. Getting back to the original question any thoughts on a re-manufactured or rebuilt?

[builderdude]

Michigan motorz.

http://www.michiganmotorz.com/marine-engines-c-31.html

No personal experience but many on this site have.

[Pcpete]

If you might have mechanical coverage on your insurance you should be talking to your agent. Be sure you get a marine engine long block not one where somebody tries to tell you they are all about the same. It's like the difference between a daily driver and a pro stock dragster. Always putting out lots of power and little loafing.

[Chuck_Wagon]

No mechanical coverage just liability. Does anyone know what the ball park figure would be to replace this motor?

[2850Bounty]

"Chuck Wagon" post=818601 wrote:
I also believe that. Getting back to the original question any thoughts on a re-manufactured or rebuilt?

[color]blue wrote:
First and foremost...... I am sorry to hear that your engine over-heated.

You will not know the full extent of damage until it has been disassembled so that the components can be closely examined!

As for a new or replacement engine, I will suggest that this is your opportunity to build a more True SBC Marine Engine.

By that I mean building a SBC for Marine use by using the correct piston profile.... and NOT the pistons that GM and most re-builders use. :evil:

This involves using a Q/E style piston and requires only minor changes to the build technique.

The benefits will out-weigh the small added cost to do so.

Another option would be to build a 6.3L SBC (aka the 383 cu in and/or what some people call the "stroker" engine) using the same build technique...... and NOT the pistons that GM and most re-builders use.

Here is a BOC thread re; this subject from back in April of this year.[/color]

http://www.baylinerownersclub.org/in...58-383-stroker

.

[SKUA_28_Contessa]

In 35 years of auto repair can't say I've ever seen one run, after quitting from overheating. Now air cooled lawn mower, yeah maybe.

[Chief_Alen]

Michigan motorz new complete or a long block .

[builderdude]

"Chuck Wagon" post=818623 wrote:
No mechanical coverage just liability. Does anyone know what the ball park figure would be to replace this motor?

An engine from Michigan will cost 2500 for a remanufactured and you'd swap many parts (if they're usable) over from the old engine. A complete "turn key" will cost around 8-9k then whatever the labor cost is in you area. As Rick pointed out, improvements can be made to the engine.

[watchthis]

On a prior boat, I had my 350 "remanufactured" by S&J Engines in Spokane. You can also simply send them your long block after you remove the "tin" as a core and receive one of theirs back in exchange. You can also direct them as to what cam and pistons you want used. As stated above, you get back a long block, and you then reuse whatever you wish from your current bolt ons and tin. They charged me $2300 including shipping. I know the current owner and it runs fine after 4 years.

[Ruffryder]

no one is suggesting him to put a truck engine? :whistle: