CMI-ED200-ER - 200A Large Frame Dimensions

[zboss]

Hello,

I am trying to find out additional dimensions of the CMI-ED200-ER - 200A Large Frame alternator listed on Mainesail's online site but I am having no luck. I haven't had very much luck contacting them in email - I am sure he is very busy.

Before you guys go there... yes it is a J180 mount and yes the pin to pin mount is slightly less than 8 inches.

I need to know its width compared to my stock alternator on my Volvo Penta D1-30 and if it will actually fit in the space we have without modification. There is not a lot of extra room on the engine for a too large -large frame- alternator but the stock mitsubishi alt appears to also be a large frame (what exactly IS a large frame alt dimensionally wise?).

- z

[rgleason]

I believe it is based on the Delco Remy 28SI short J180 mount, which is 8.5 inches I think. I've measured and made drawings of my 3YM30 and this alternator to figure out how to fit it, in another thread.

[GordMay]

Rod gives the dimensions, on his webpage (scroll right on the pics) ➥ https://shop.marinehowto.com/product...uty-alternator

Oops - I see rgleason beat me to it.

[rgleason]

GordMay, I inadvertantly showed both long J180 and short J180. The CMI-ED200-ER is short foot dimension = 7.79 in

Here is a drawing with the Delco Remy 28SI Short J180 #860312 on a 3YM30
https://www.cruisersforum.com/forums...ml#post2762002

[GordMay]

Originally Posted by rgleason

GordMay, I inadvertently showed both long J180 and short J180. The CMI-ED200-ER is short foot dimension = 7.79 in

Here is a drawing with the Delco Remy 28SI Short J180 #860312 on a 3YM30
https://www.cruisersforum.com/forums...ml#post2762002

Indeed.
7.79" (198.0 mm) is what Mainesail indicates on his drawing.

[zboss]

Originally Posted by GordMay

Rod gives the dimensions, on his webpage (scroll right on the pics) ➥ https://shop.marinehowto.com/product...uty-alternator

Oops - I see rgleason beat me to it.

I saw that but that is not the dimension I need. I need to know the dimensions across the face of the alternator - the width. That diagram shows the depth and the height. Based on rgleasons diagram it looks like its 6 inches across - which seems really small for a large frame alt.

[rgleason]

Diameter of Alternator =Radius 77mm x 2=3.0315 x 2 = 6.06 inches

However the critical part in my case is related to the depth measurements.

[Dsanduril]

I think this is the dimensional drawing of the stock Volvo/Mitsubishi alternator, had to go through the process of finding a replacement in a far off land and this was the best I found. Naturally the other arrow is missing for the one dimension that is critical to your question, but I'd say body diameter of the stock Mitsu is 135mm as compared with 154 on the CMI.

[zboss]

Thanks for the info guys. I would have thought that a large frame alt would be significantly larger. We don't have a lot of range of motion for the alt to swing between the loose position where we can install the belt and the end of the range where the belt is tightened so I wanted to make sure that it was an option.

[rgleason]

As you are doing it take some pictures and post them, to help others.

[rgleason]

I was able to check the Delco Remy 28SI #860312. 160a 12vdc on our 3ym30 and it will fit with modifications to the alt for external regulation and changing the pulleys to independent drive just forward of the existing crank pulley. This change require moving the system coolent hose forward too. If you have enough room to swing the alt out such that the B+ gets away from the heat exchanger, it will work. Our engine is pretty tight and it works, so the CDMI would probably work, given these additional changes.

Provided you have enough room to swing the alt out, the critical part is the depth.
On ours, the aft foot needs to be against the alt engine bracket, which gets the inside of the alt pulley within 1/8" of the face of the engine crank pulley. I think it is close enough to work with to align the new pulleys required.

[rgleason]

Originally Posted by rgleason

I was able to check the Delco Remy 28SI #860312. 160a 12vdc on our 3ym30 and it will fit with modifications to the alt for external regulation and changing the pulleys to independent drive just forward of the existing crank pulley. This change require moving the system coolant hose forward too. If you have enough room to swing the alt out such that the B+ gets away from the heat exchanger, it will work. Our engine is pretty tight and it works, so the CDMI would probably work, given these additional changes.

Provided you have enough room to swing the alt out, the critical part is the depth.
On ours, the aft foot needs to be against the alt engine bracket, which gets the inside of the alt pulley within 1/8" of the face of the engine crank pulley. I think it is close enough to work with to align the new pulleys required.

After getting a rough installation as above to confirm that it would work, I decided to try to push the alternator aft so the front leg is against the standard 3YM30 bracket and do a standard Balmar setup. The challenge here was to grind down a 3/8 grade 8 bolt to be as long as possible but fit between the manifold and the aft of the alternator bracket (a shade less than 2 1/4"). With the right spacers (3/8"x3/4" 3/4"long ground down) I was able to fit the rear bolt with at least 5/8" holding. The alternator has to be swung out enough so it does not rest on the water pump hose and the amount of swing out clearance in my boat gets most of the rear of the alternator away from the manifold, however there is not much left for tensioning the belt (between 42"-43 1/2" belt circumference). This standard Balmar setup saves having to alter the system water pump belt and hoses but requires the Balmar water pump sheave. The pulleys are aligning within one washer's thickness.


I'll post some photos when it is completed.

[rgleason]

The point is that the CMI 200 will fit a 3YM30 provided you have enough room to port of the engine.