changing 16 amp charging system to 40 amp

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buddybo

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Sep 1, 2013
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Hi, I have a 1987 150 hp blackmax mercury and was thinking about changing the 16 amp charging system to 40 amp. Is this possible? thanks
 
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UncleWillie

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Re: changing 16 amp charging system to 40 amp

Anything is possible if you are determined enough! :)

Understand, it will NOT noticeably charge your batteries any faster.
If you are trying to power a 30 amp (360 watt) stereo there are other options.

What is your reasoning? :confused:
 
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buddybo

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Re: changing 16 amp charging system to 40 amp

It is not firing on 1,3,5 and I think it might be the stator that's causing this. I have a 1989 150 hp mariner with a thrown rod that has a 40 amp stator. If this can be done I'll use the stator, flywheel, etc from the mariner on the xr2.
 
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UncleWillie

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Re: changing 16 amp charging system to 40 amp

So what you really have is a Engine/Magneto Problem, and not an Electrical/Charging problem.
I am not familiar with that Engine but I am sure others will be. If not, Try it!
 
Faztbullet

Faztbullet

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Re: changing 16 amp charging system to 40 amp

With some engineering you can swap all the 40 amp parts over but you may have to swap the upper bearing housing due to height issues. Also the cranks use different size upper main bearing so check the sizes....
 
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buddybo

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Re: changing 16 amp charging system to 40 amp

Faztbullet said:
With some engineering you can swap all the 40 amp parts over but you may have to swap the upper bearing housing due to height issues. Also the cranks use different size upper main bearing so check the sizes....
Click to expand...

I have everything changed over except for the main bearing and the housing because the mariner's crank is a different size. Hopefully I can find the right bearing and housing for the xr2 to make this project work. thanks
 
snowbrd84

snowbrd84

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Re: changing 16 amp charging system to 40 amp

Before you pull the flywheel, swap all wires from the top switchbox to the rear switchbox and vice versa. One box fires odd cylinders, one fires even. After swapping, if the same cylinders fire, then look at the stator, if the evens now fire, get another switchbox. Free and easy test, takes about 20 minutes to swap the wires and give it a shot....
 
Dukedog

Dukedog

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Re: changing 16 amp charging system to 40 amp

buddybo said:
I have everything changed over except for the main bearing and the housing because the mariner's crank is a different size. Hopefully I can find the right bearing and housing for the xr2 to make this project work. thanks
Click to expand...

Not sure on this but tha '89/'90 2.0 with tha 40 amp stuff might have had tha 1 1/2 inch crank bearing surface like tha early 2.0's. There should be someone on here that can research it. If I was at home I could find out for sure but......

You can make yours work with a little "southern enginnerin'" on tha rear portion of tha bracket. You will need ta drill and tap a coupla extra 10/24 hloes ta mount tha stator though........
 
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buddybo

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Re: changing 16 amp charging system to 40 amp

Dukedog said:
Not sure on this but tha '89/'90 2.0 with tha 40 amp stuff might have had tha 1 1/2 inch crank bearing surface like tha early 2.0's. There should be someone on here that can research it. If I was at home I could find out for sure but......

You can make yours work with a little "southern enginnerin'" on tha rear portion of tha bracket. You will need ta drill and tap a coupla extra 10/24 hloes ta mount tha stator though........
Click to expand...

I've been doing some measuring and I think the crank on the xr2 is 1 1/2 and the 89 mariner's crank is 1 3/8 inches.

This is confusing to me but I think I've got it figured out, I borrowed the original xr2 crank bearing from it's end cap bracket and used it in the mariner's 40 amp end cap bracket. So the 40 amp stator will be mounted back on it's original bracket on the xr2.

Hopefully all the cylinders will fire again when I'm done.

So far I've spent 0 $$$ on this project. Hope it works!!!
 
Dukedog

Dukedog

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Re: changing 16 amp charging system to 40 amp

buddybo said:
I've been doing some measuring and I think the crank on the xr2 is 1 1/2 and the 89 mariner's crank is 1 3/8 inches.

This is confusing to me but I think I've got it figured out, I borrowed the original xr2 crank bearing from it's end cap bracket and used it in the mariner's 40 amp end cap bracket. So the 40 amp stator will be mounted back on it's original bracket on the xr2.

Hopefully all the cylinders will fire again when I'm done.

So far I've spent 0 $$$ on this project. Hope it works!!!
Click to expand...

Now that's tha "research" that's needed ta make things work. Not being at home didn't know for sure if tha OD of tha bearings were tha same! Good for you.......If you have tha clam shell ya might wanna change those too............Did ya change tha divider plate, coil plate and water cooled reg/rectifier?
 
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buddybo

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Sep 1, 2013
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Re: changing 16 amp charging system to 40 amp

Dukedog said:
Now that's tha "research" that's needed ta make things work. Not being at home didn't know for sure if tha OD of tha bearings were tha same! Good for you.......If you have tha clam shell ya might wanna change those too............Did ya change tha divider plate, coil plate and water cooled reg/rectifier?[/QUOTE
This motor actually has a xr4 hood, it clears the fly wheel okay and yes I had to use the mariner's divider plate in order to use it's coil plate and water cooled reg/rectifier.

Well good news, all cylinders are firing again now so the stator was the problem. Thank everyone for their reply!!!
Click to expand...
 
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1nebel0

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Nov 28, 2005
Messages
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Re: changing 16 amp charging system to 40 amp

I lost that bet...my money was on the switch box which fail more often than the stator.........
 
Faztbullet

Faztbullet

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Re: changing 16 amp charging system to 40 amp

I lost that bet...my money was on the switch box which fail more often than the stator.........
Click to expand...
Maybe on that side of the country!!:) I had stators fail while lying in a box while engine was rebuilt!!!!!
 
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