Replacing 22 year old Mercruiser 7.4L Circulating Pumps as Preventative Maintenance

[rnace]

Should I replace my 22 year old Mercruiser 7.4L circulating pumps as preventative maintenance? I don't have any issues with them on my 1997 FWC engines but I currently have my exhaust hoses, mufflers and elbows off to change my elbow/riser gaskets and have easy access to the circulating pumps.

What is the typical lifespan of circulating pumps on Mercruiser 7.4L FWC engines?

Are the aftermarket marine circulating pumps as good as the Mercruiser circulating pumps? I noticed they are half the price.

 

[Scott Danforth]

Fresh water, or salt water. Usually they last decades

 

[achris]

Should I replace my 22 year old Mercruiser 7.4L circulating pumps as preventative maintenance? I don't have any issues with them on my 1997 FWC engines but I currently have my exhaust hoses, mufflers and elbows off to change my elbow/riser gaskets and have easy access to the circulating pumps.

What is the typical lifespan of circulating pumps on Mercruiser 7.4L FWC engines?

Are the aftermarket marine circulating pumps as good as the Mercruiser circulating pumps? I noticed they are half the price.

It's FWC, and you only ever run coolant? 22 years is brief. If it's not leaking, leave it be.

Chris..........

 

[Scott Danforth]

missed the FWC. if its FWC, it could last 50+ years. leave it alone

 

[Lou C]

As long as the bearings are running smoothly and they don’t leak leave em be. When they go bad the bearings get noisy and they start to leak from the weep hole.