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Automotive Engine Base for 3.0L 181ci Mercruiser

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Posts: 4
Joined: Sun Apr 28, 2019 8:26 am
Vessel Info: 1995 Excel 19 SX Bowrider Inboard/Outboard 3.0L Mercruiser Alpha One Outdrive
Seawater use in Virginia Beach, VA
3rd Owner with unknown hours (estimated at 450h)
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Automotive Engine Base for 3.0L 181ci Mercruiser

Postby pjaec001 » Mon Aug 05, 2019 1:23 pm

I know there are differences in Marine and Automotive Engines and I know what those important reasons are, but I am curious as to what the automotive equivalent is to the 3.0L 181ci 4cylinder Mercruiser Engine is.
I know its a GM Motor, but cant seem to find one that matches up by any GM years, makes, or models.
Anyone here know?

I recently just replaced my starter on this and did so with the proper marine rated starter, but was curious as to what the cost would have been using the automotive one.
I also tend to need to replace the starter relay frequently and want to see if there is a difference in the marine or auto version.

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Vessel Info: Jester Toy
2002 270 Coastal, Twin Yamaha 4 stroke 250
Location: Hudson Fl
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Re: Automotive Engine Base for 3.0L 181ci Mercruiser

Postby CptBill » Mon Aug 05, 2019 2:39 pm

You'll need to get the # off the block and look it up in a cross ref. chart or just put it in the www and see what comes up. The basic block is the same it's all the add on stuff that makes the difference. Of course some blocks are a little different when you get into the bigger motors, things like 4 bolt main bearings and so on, also' most of the time they use engine platforms that are designed for trucks not cars.
The trouble with trouble is it starts as fun!

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