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Old 08-04-2020, 04:01 PM   #1
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engine Question

I'm trying to determine the purpose of the hose in the following picture of my trawlers engine.

My engine is a Yanmar 6LY3-UTC. Any thoughts?

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Old 08-04-2020, 04:07 PM   #2
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I'm trying to determine the purpose of the hose in the following picture of my trawlers engine.

My engine is a Yanmar 6LY3-UTC. Any thoughts?

Attachment 105881
What angle is that photo taken at - from the bottom of the engine?

At first I thought it was an oil change hose, but there would be a valve at the engine end.

Could be a blow by hose?
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Old 08-04-2020, 04:13 PM   #3
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What angle is that photo taken at - from the bottom of the engine?

At first I thought it was an oil change hose, but there would be a valve at the engine end.

Could be a blow by hose?
I added a second photo. This would be the maintenance side of the engine.
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Old 08-04-2020, 05:01 PM   #4
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It's got oil in it though, right?
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Old 08-04-2020, 05:08 PM   #5
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A condensate drain line for the intercooler?
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Old 08-04-2020, 05:10 PM   #6
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That engine is notoriously messy to change the filter. There is a shallow basin as part of the after cooler casting that catches (some of) that oil. That hose drains that basin. So put a container underneath the hose when you remove the filter. Better yet try (and it isn't easy) to wrap a baggy around the filter to catch the oil.

Some people say you can contain the oil that way. I haven't had much success with that.

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Old 08-04-2020, 05:22 PM   #7
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It's got oil in it though, right?
Yes, that is what it looks like.
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Old 08-04-2020, 05:26 PM   #8
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What angle is that photo taken at - from the bottom of the engine?

At first I thought it was an oil change hose, but there would be a valve at the engine end.

Could be a blow by hose?
That was what one of the marina guys thought.
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Old 08-04-2020, 06:52 PM   #9
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What DavidM said. A drain hose for the basin under the oil filter.
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Old 08-04-2020, 07:07 PM   #10
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DavidM correct
Dont expect it to handle a dump of the filter due to the size of the well and hose.
If you puncture and drain most of the filter it will catch a small trickle. Just remember to stick the hose in a jug or it drains into the bilge.
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Old 08-04-2020, 07:26 PM   #11
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What a dopey arrangement for a filter. I wonder if there is a way to move it like you could on a Ford-Lehman 120?
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Old 08-04-2020, 07:52 PM   #12
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I imagine that any shop doing an oil change will charge for the extra time it takes to clean up afterward. Even a few tablespoons of oil can make a mess over time.
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Old 08-04-2020, 08:15 PM   #13
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Its not very messy if you do it right.
Best to puncture and drain the filter in place before removing. The well works for capturing the little remaining and drains via the hose. A paper towel or 2 wipe out the well and you are ready to replace filter and refill.
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Old 08-04-2020, 08:18 PM   #14
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Tricks of the trade! Excellent suggestion.
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Old 08-05-2020, 08:10 AM   #15
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So then you just replace the filter dry?
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Old 08-05-2020, 08:56 AM   #16
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Good question! How long will the engine run without fresh oil while it fills? No damage every time you change the filter? I have no idea how much/fast an oil pump is? This is more about the design of the system.
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Old 08-05-2020, 09:13 AM   #17
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IMO there is no choice but do it dry. I would run the engine briefly to get everything lubed then remove filter. I have spun the starter with fuel off until oil pressure comes up.
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Old 08-05-2020, 09:14 AM   #18
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So then you just replace the filter dry?
My guess is the engine manufacturers who ship us engines with upside down and horizontally installed filters have figured out that there is no harm done. The engines seem to just keep on ticking.
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Old 08-05-2020, 12:04 PM   #19
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As a professional mechanic for 40 years, I have never seen anyone pre-fill an oil filter before installation. Many filters are located upside down or horizontally and cannot be pre-filled. There is a sufficient film of oil on the bearings to protect things until oil pressure is achieved. I had friends at a junk yard that would drain all the oil and coolant out of junk engines and see how long they would run. Most ran for at least 10 minutes at full throttle before seizing. The few seconds it takes to fill the filter causes no damage.
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Old 08-05-2020, 12:37 PM   #20
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Yanmar manual recommends hold fuel stop while cranking when starting after long term storage.
I follow that advice after an oil / filter change.
I usually crank for about 10 +/- secs and find when I then crank normally eng oil P comes up quickly and alarm goes off in a couple secs... no longer than normal start.
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