New Years 'Mechanical' Resolution

OllieC

Well-Known Member
SILVER Sponsor
Mar 11, 2013
6,697
N.W. ‘Sconnie
Boat Info
Sara Belle
2005 Weekender 215
Engines
Mercruiser 5.0 mpi, Bravo III
Fellow Sea Ray'ers,
Happy New Year!

For 2018 I've decided to do a couple of mechanical replacement/upgrades & wanted your opinion. I am looking at replacing the Water Pump & the Alternator.

2005 5.0mpi with a Bravo 3.
The water pump is original. I added a wear plate to it once I started losing suction & now the wear plate is starting to pit. I also believe the bearings are starting to wear. This is what I was considering; http://www.cpperformance.com/p-1681...6-mag-ho-82l-mag-and-502-mag-with-pulley.aspx Someone told me that going stainless wasn't a good idea, but I boat in fresh water????

For the Alternator, should I go larger than stock? I have no idea where to start.

Thanks for the help.
Ollie
 
Find the wire size on your alternator it will set the maximum size alternator you can replace it with. We went from 55AMP to 70AMP. If you go over 100AMP your present belts will probably need to be upgraded or they will fail.
For wire size check the net for max AMPs they will handle. It is function of AMPs and wire length. A real electrician can help. That is what I used.
 
It’s a simple voltage drop calculation. Just remember that the lower the voltage (12v for your alternator output), the more voltage drop is a concern. I would recommend that you verify the wire size, verify the length, then size the alternator conservatively. No need to heat up that wire!
 
Is your alternator dying? Bearings going out? Rattling?

I would just go with stock.
No, but I did notice at the end of last season when I started it up, it was under 10 and wouldn't reach 13.5v for a few minutes. I have a dual battery setup and always run the house batt for anchorage activities.

If I recall correctly, when I use to fire it up, it went right to maximum 13.5v
 
Find the wire size on your alternator it will set the maximum size alternator you can replace it with. We went from 55AMP to 70AMP. If you go over 100AMP your present belts will probably need to be upgraded or they will fail.
For wire size check the net for max AMPs they will handle. It is function of AMPs and wire length. A real electrician can help. That is what I used.
Mine stock is a 69amp (70 amp)
 
70 amp on a boat your size should be plenty. Just make sure the batteries are good and properly maintained.
 
The pump you listed from CP is a Hardin pump. They only sell them with a pulley now because of all the problems they had with people putting them on wrong. I have 2 Hardins. So far so good. http://www.hardin-marine.com/p-1681...6-mag-ho-82l-mag-and-502-mag-with-pulley.aspx

20161103_193632.jpg
 
I notice you have no issue with the stock mounting bracket. That was a concern. I added a wear plate to my existing pump which made it longer. Whenever I replace the impeller, its a chore to get the mounting bracket back on. It's actually more difficult than replacing the impeller itself.
 
Just have the alternator rebuilt. Don't waste money on a new one unless you have a major issue.
 
I notice you have no issue with the stock mounting bracket. That was a concern. I added a wear plate to my existing pump which made it longer. Whenever I replace the impeller, its a chore to get the mounting bracket back on. It's actually more difficult than replacing the impeller itself.

They make them to compensate so the bracket fits. No problems at all.
 

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