Yanmar 3GM hose size

Posted by TangoLimaGolf@reddit | sailing | View on Reddit | 7 comments

I’ve got a Yanmar 3GM and I’m replacing some aging hoses. I’ve got the 3/4” line replaced from the water pump to the heat exchanger however I noticed after testing that the larger diameter hoses in blue are leaking seawater.

I can’t find any markings on them so I’m not sure on the diameter. Any assistance would be appreciated.

The first photo is some random one off the internet I happened to stumble across that happens to highlight the exact hose I need to replace (number 6), I’m guessing number 4 and 5 is the exact same diameter as well which I’ll replace since I’m doing the job.

The second photo is my actual engine.

[-]

RedditIsRectalCancer@reddit

You buy those hoses pre-molded from yanmar, they're expensive. There's not much reason to replace them, however, because they're not under pressure like a car engine so they last a shitload longer.

texasrigger@reddit

Those are modeled hoses. You'll be able to find the exact replacements from a yanmar dealer. If I remember correctly, they aren't obscenely priced.

ManWhoIsDrunk@reddit

A set of calipers is a very worthwhile investment if you do your own engine work on both cars and boats. Simple ones are dead cheap, and the best way to measure diameters for hoses and bolts etc.

TangoLimaGolf@reddit (OP)

I have a great digital caliper but of course didn’t have it with me at the boat. Thanks for the suggestion.