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Old 19-09-2020, 16:29   #1
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Join Date: Jul 2018
Location: Seattle, WA
Boat: Cal 39 Mark II
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Perkins 4108 belt (watermaker)?

Hello,

I have a 1978 Cal 39 MkII with a 4108. It has a watermaker that I have never used (in years). That watermaker has (I think) a pump with a belt system mounted in the engine room. See photo... red circle. It’s an old model Cat pump. The belt has broken, so I am wondering if I need to replace it (again, I do not intend to use the watermaker anytime soon)?

Can I run the 4108 without that belt, or is the engine timing or the tension of other belts in amy way connected to this pump and belt? I know enough about diesels engines to be dangerous.

I can’t get the image to appear in this post, but it is at Imgur linked here.

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S/V AIOLOS - Cal 39 Mark II Tall Rig
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Old 21-09-2020, 06:30   #2
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Re: Perkins 4108 belt (watermaker)?

I too have a Cal39 MKII, and it used to have a 4-108...

The only belt that you really need on the engine is the single belt that is driving the circulation pump (painted red) and the original alternator.

Then you have a set of twin belts driving something which we canít see in the photo, probably a high output alternator.

If you donít want to replace the water maker pump belt, don't. It wonít hurt anything if you leave the belt off.
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Old 21-09-2020, 12:10   #3
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Re: Perkins 4108 belt (watermaker)?

Hi Doug,

That is very helpful. Thanks for your quick reply!
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S/V AIOLOS - Cal 39 Mark II Tall Rig
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