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FalParsi 
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Joined: 28 January 2021 Location: Malta Status: Offline Points: 140 |
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 Topic: Volvo coolingPosted: 11 December 2023 at 20:20 |
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Question:
I have a Volvo D2-75, and it has the small coolant expansion tank mounted above the engine. So why do I still have a vent on the coolant cap on the engine itself?  |
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2016 Hanse 505 #120
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Arcadia
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Joined: 27 November 2017 Location: Sag Harbor, USA Status: Offline Points: 1112 |
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Posted: 11 December 2023 at 22:04 |
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Strange. Where does the hose go to from your expansion tank?
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Leon / ARCADIA
2018 Hanse 588 Sag Harbor, NY |
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FalParsi
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Joined: 28 January 2021 Location: Malta Status: Offline Points: 140 |
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Posted: 11 December 2023 at 23:12 |
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Back to the same coolant filler cap. Doesn't make sense right?
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2016 Hanse 505 #120
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Jojo
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Joined: 03 August 2022 Location: liljeholmen swe Status: Offline Points: 166 |
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Posted: 12 December 2023 at 06:17 |
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Wrong mounted at first place?
Re rute it from engine under the coolant cap to underneath the expansion tank I guess the adapter above the cooling cap was connected but then the thinner hose on other side of adapter that supposed to go to the engine vent That’s how I would do
Edited by Jojo - 12 December 2023 at 06:35 |
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3 Cabin, Hanse 342, Deep draft, Tiller version.
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ohthetrees
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Joined: 24 November 2019 Status: Offline Points: 189 |
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Posted: 12 December 2023 at 19:19 |
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Mine is exactly the same as FalParsi's from the factory. I believe what is happening is it is a special cap. My cap is very "deep" and I think it seals below the hose barb on the throat of the coolant filler on the engine. Basically, I think that hose barb is unused with our configuration because of the special cap.
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sgrhma2
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Joined: 20 November 2021 Location: Northern Irelan Status: Offline Points: 271 |
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Posted: 20 December 2023 at 16:47 |
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Ohthetrees, your photo is showing a perfect example of what I was saying in post before yours.
I also meant to say that the coolant in the bottle of FalParsi’s second post looks very weak. Ideally coolant should be a 50:50 antifreeze and water mix and preferably using OAT rated antifreeze (longer coolant life). Apart from the obvious freezing prevention, the reason for this is primarily for corrosion protection and the benefit of a higher boiling temperature of the coolant. This higher boiling temperature adds a considerable margin of safety for an engine that works in a hot environment and in the event of partial coolant loss situations the staining from the antifreeze will be more visible to identify repair or maintenance issues. Hope this is helpful Simon
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FalParsi
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Joined: 28 January 2021 Location: Malta Status: Offline Points: 140 |
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Posted: 21 December 2023 at 13:03 |
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Thanks all for your response. The coolant used is Volvo yellow premixed and is replaced every two years. I took that photo right after draining and replacing the coolant.
Since it does spit out a bit of coolant through the hose barb when I run the engine I am considering putting a short (10 cm) hose on it with an end cap.
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2016 Hanse 505 #120
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