Mercruiser serial number

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ChrisCraftJohnny

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Before I really start working on my engine. I would like to make sure, 100% what my engine serial number is for a positive I.D.

The decal on the engine was painted over (rebuilt engine - 100 Hrs. on it)

I was able to clean and scrape with my thumbnail (patience of Job)
all the paint off the decal. The only problem is that these decals had permanent print for all the info EXCEPT the S/N:

That was held on by some kind of contact cement and that cement was all that was left of that number even before I got there.

On a 1987 GM 4.3L V6 Mercruiser engine, where is the engine serial number located.

The intake manifold has the 1987 year, month and day cast into it as well. I know my boat is a 1988, but the motor was most likely made a bit before the model year of my CC.

The intake has a number cast into it as well. But this is a casting number, not a serial number.

Does anyone know for sure where the engine serial number is stamped?

Johnny
 

Bondo

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Re: Mercruiser serial number

Ayuh,... If the block is original, there's a tag riveted to it, just ahead of the Starter....
 

ChrisCraftJohnny

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Re: Mercruiser serial number

Thanks Bond-o!

I will check that out soon.

I love the 4 cycle animation you have. Very cool. I should show my Wife!

Johnny
 

Bondo

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Re: Mercruiser serial number

I love the 4 cycle animation you have. Very cool. I should show my Wife!

Ayuh,... A gift from a friend,... Xtraham, ;) a former/ occasional poster here at iboats...
 

ChrisCraftJohnny

Petty Officer 2nd Class
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Re: Mercruiser serial number

Bond-o,

Did not see the decal ahead of the starter. Looked with mirror and light. Very hard to see.

I did see that the water outlet on the engine has a number on it. It starts with OB. I need to scrape off some of the heavy Phantom Black to see it clearer.

According to the Merc manual, my engine should start with OB.

Can this also be the engine serial number?

Engine: 1987 MCM 175 4.3L V6
Original motor but rebuilt, bored .030 over.

Thanks,
Johnny
 

Don S

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Re: Mercruiser serial number

There is another way to ID the engine. Give me a bit, and I will find the service bulletin for you.
 

Bondo

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Re: Mercruiser serial number

Ayuh,... Another Great little tibbit,... Thanks Don...
 
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