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Mercruiser 350 Mag MPI Impeller (Kit) part #(s)

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Mercruiser 350 Mag MPI Impeller (Kit) part #(s)

Postby Batwing » June 9th, 2021, 5:45 pm

Does anyone know the part number(s) for the impeller kit for the Mercruiser 350? Additionally, how challenging is it to replace myself vs. the marina shop?

Thanks for any input


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Re: Mercruiser 350 Mag MPI Impeller (Kit) part #(s)

Postby Viper » June 9th, 2021, 10:14 pm

46-807151A14 is the body/impeller kit. How challenging it is to replace really depends on accessibility and your mechanical aptitude. One engine is usually easier to do than the other.

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Re: Mercruiser 350 Mag MPI Impeller (Kit) part #(s)

Postby tomschauer » June 9th, 2021, 10:16 pm

It depends on the drives. For 1999 i suspect you have bravo 1 or 3's. All of the bravos use the same engine mounted raw water pump, no matter what engine size. The challenge will be access. if you can easily get to the pumps, its a really simple job.

If you happen to have alpha drives, its a different story. The boat need to be out of the water and you need to drop the lower half of the out drive to replace the impellers.
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Re: Mercruiser 350 Mag MPI Impeller (Kit) part #(s)

Postby Batwing » June 10th, 2021, 2:12 pm

Thanks for the quick reply. Not certain on Alpha or Bravo. I'll investigate further.
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Re: Mercruiser 350 Mag MPI Impeller (Kit) part #(s)

Postby bud37 » June 10th, 2021, 3:15 pm

I think 350 mariners are all inboard v drives.
All above is my opinion, nothing more.

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Re: Mercruiser 350 Mag MPI Impeller (Kit) part #(s)

Postby Viper » June 10th, 2021, 9:14 pm

Ya inboards, so the pump kit is the number I posted.
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Re: Mercruiser 350 Mag MPI Impeller (Kit) part #(s)

Postby Cooler » June 11th, 2021, 9:59 am

If you do it yourself, make sure to lubricate the impellers when you insert them. Crazy how many people think they can ignore such a simple task. Finally, get the belt adjusted correctly. Kinda a PITA on one side due to access. 8-) er
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Re: Mercruiser 350 Mag MPI Impeller (Kit) part #(s)

Postby RGrew176 » June 11th, 2021, 11:55 pm

Just out of curiosity when you lubricate the impellers what do you lubricate with. In a previous installation of new impellers the mechanic used silicone spray to lube them with prior to installation. I've heard some people use vegetable oil.
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Re: Mercruiser 350 Mag MPI Impeller (Kit) part #(s)

Postby throwback2 » June 12th, 2021, 5:48 am

RGrew176 wrote:Source of the post Just out of curiosity when you lubricate the impellers what do you lubricate with. In a previous installation of new impellers the mechanic used silicone spray to lube them with prior to installation. I've heard some people use vegetable oil.

I've always used dish soap.With the exhaust on my boat being underwater,the bubbles show that the pump is working.

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Re: Mercruiser 350 Mag MPI Impeller (Kit) part #(s)

Postby Viper » June 12th, 2021, 9:01 am

Depending on the brand, some kits come with a little packet of grease/lubricant. The best was the Onan impeller kits that came with a large packet of it. Always had some in my tool box. The packets are much smaller now so I rarely have that anymore. Dish soap is what I use most of the time, does the job just fine, and you don't need much. It's only needed to cover an initial dry startup. Once water gets into the pump, it does the lubricating.

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