4.5L B3 impeller change DIY

[VintageRacer]

Anyone here have the 4.5L Merc and performed their own impeller change? I cannot seem to find any current videos on it anywhere. I ask, as I thought I might try it myself-and make it an every other year thing-safety first, you know! But, With my boat stored now, I cannot even go look to see if it is accessible and worth trying. Any pictures?

[bruceb58]

My suggestion...buy the Mercruiser service manual for your engine. I bought my manuals even before I picked up my boat. For my engine, a 2017 6.2L(Mercruiser engine...not GM) the instructions in the manual seem very straight forward.

BTW, your 4.5L has the exact same style water pump as mine. Likely even the same kit.

[rabiddawg]

I would change it EVERY year. On my old Malibu I skipped a year and sure enough it failed while on Greers ferry. Idled it in and luckily picked one up in Heber Springs.

[bruceb58]

I would change it EVERY year. On my old Malibu I skipped a year and sure enough it failed while on Greers ferry. Idled it in and luckily picked one up in Heber Springs.

I change mine every other year but since I just picked up this boat, I will likely change it even though previous owner did it last year.

[dogwspts]

Should be ok they are a pain to get to.
At least on my 220s

[bruceb58]

Should be ok they are a pain to get to.
At least on my 220s

Mine is SUPER easy. Just looked at it today. Wish everything was this easy to get too. That's the thing I love about this R5. One of the easiest boats I have owned to work on since my whole body can fit in the engine compartment.

[dogwspts]

What is your top speed with this engine.

[VintageRacer]

What is your top speed with this engine.

I only had my boat out 3x before I had to put her away for the winter-Gauge showed me 53 mph with just two of us in the boat.

Also-Thanks for the info- bruceb58, I found a manual on ebay for the 4.5L and bought it.

[bruceb58]

Also-Thanks for the info- bruceb58, I found a manual on ebay for the 4.5L and bought it.

I have an impeller kit coming from PartsVu. They have it for a little over $50.

[Big Block Power]

Also-Thanks for the info- bruceb58, I found a manual on ebay for the 4.5L and bought it.

I have an impeller kit coming from PartsVu. They have it for a little over $50.

Is it a merc kit?

[bruceb58]

Also-Thanks for the info- bruceb58, I found a manual on ebay for the 4.5L and bought it.

I have an impeller kit coming from PartsVu. They have it for a little over $50.

Is it a merc kit?

Absolutely...wouldn't use anything else.

Looks like they raised their price to $61.26

https://www.partsvu.com/impeller-kit-98-8m0137220.html

[Big Block Power]

I have an impeller kit coming from PartsVu. They have it for a little over $50.

Is it a merc kit?

Absolutely...wouldn't use anything else.

Looks like they raised their price to $61.26

https://www.partsvu.com/impeller-kit-98-8m0137220.html

Good thanks!

[bruceb58]

Good thanks!

I very very rarely ever use anything but OEM parts. Not worth it.

An example of a non OEM part I use would be a Wix oil filter.

[Big Block Power]

Good thanks!

I very very rarely ever use anything but OEM parts. Not worth it.

An example of a non OEM part I use would be a Wix oil filter.

I wouldn't even use that. Lol

I used the mercury marine racing oil filter on my merc. I figured If it was good enough for their race engines it's good enough foe mine. Same with kendall oil

[AsLan7]

Good thanks!

I very very rarely ever use anything but OEM parts. Not worth it.

An example of a non OEM part I use would be a Wix oil filter.

I wouldn't even use that. Lol

I used the mercury marine racing oil filter on my merc. I figured If it was good enough for their race engines it's good enough foe mine. Same with kendall oil

.
Just make sure the taller racing filters don't impede with the engine hatch for those filters that our mounted upside down!

.