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Old 28-02-2021, 17:09   #1
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Zf gearboxalternative cooling water connection

So i just bought a boat which comes with yanmar 4jh2 and zf 15miv. The way the salt water is connected it comes though the hull directly to the cooling unit of the gearbox and pass to the filter of the engine after before it gets to the impeller.
My thinking is it would make more sense to let it pass by the filter/strainer first before it gets to the transmission (which has a filter inside i think, but much smaller and hard to clean?)?
Anybody know if thats the normal way to connect this v-drive? Direct from the sea?
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Old 28-02-2021, 17:23   #2
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Re: Zf gearboxalternative cooling water connection

I can think of no good reason for doing what was done on your boat.

In any raw water cooling system you want the smallest opening to be in an easily cleanable strainer. On your boat right now you could easy ingest things that would clog the difficult to clean heat exchanger on you tranny before they ever saw the strainer. And what's worse, you would have no way of knowing! At least with a strainer when it clogs you can quickly open it up and SEE.

The first time you motor through a cloud of jellyfish you will roundly and throughly cuss the person who plumbed it up this way!
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