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Blower for engine

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Ashtead View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ashtead Quote  Post ReplyReply Direct Link To This Post Topic: Blower for engine
    Posted: 29 July 2022 at 12:29
hi - our engine blower on a Volvo 40hp seems to have packed up. Is there a fuse maybe which has gone and if so any thoughts on location?
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Wild View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wild Quote  Post ReplyReply Direct Link To This Post Posted: 30 July 2022 at 19:11
model? Year?
The engine compartment blower is normally powered by a relay on the on-off switch of the engine contact
So if you donít have a wiring diagram try the following the wires of the blower to find the fuse.
Wild and Wet
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Ashtead View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ashtead Quote  Post ReplyReply Direct Link To This Post Posted: 03 August 2022 at 19:58
hi we are a 2015 moody but built by Hanse so same Volvo set up maybe the relay has failed but I will investigate. It used to carry on running for a while after shut down of engine
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Mat View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mat Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2023 at 01:04
Hi, Iím on a Hanse 385 (2016) with a VP D1-30 and had encountered something similar where I thought my engine blower had given up. Motor and cooling worked perfectly fine, safe for the blower. My initial thought was something is wrong with the wiring or fuses but then I found out that the blower is actually not wired to the engine switch (at least not on my boat) but only turns on if you also have your service battery switched on concurrently. By way of reference, my blower draws about 6 amps.

Edited by Mat - 17 October 2023 at 01:06
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DJgun View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DJgun Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2023 at 01:39
An my 2007/2008 H400e, there was a blower which had seized. Strangely the wiring isn't even shown anywhere on the wiring diagram.  When I investigated by tracing wires I found the wires not terminated at the electrical panel end. Obviously the previous owner just disconnected it all when the blower failed.

I decided to put a timer relay on the blower, so it runs just for 5 minutes at engine start, and also 5 minutes at engine shut-down. 

Rather than use another axial blower I changed to a centrifugal blower which can handle bigger pressure differences  and is continuous rated not intermittent rated like most of the axial blowers. Reliability is important to me.
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HIN DE-HANJ0331J708
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Ratbasher View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ratbasher Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2023 at 07:10
DJ - thanks; I hadnít realised that the axial type was intermittent rated.  Mine died at the start of the season and I replaced it with a more powerful Vetus for not much money more. Iíve had the boat for 600 of its 1600 engine hours so unsure if the blower had been replaced previously. In light of your comment Iím wondering if they should just be classed as a consumable item if you want to have them running continuously, as I understand they should be. 
H400 (2008) 'Wight Leopard' now hibernating Gosport UK until next year.
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Mat View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mat Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2023 at 07:59
Thatís a good one. I also thought the engine vent should be running as long as the motor is on. I guess the idea is to get any potential mono carbon dioxide out of the ship so if youíre sailing single handed and on deck with fresh air the 5 min in and 5 min out would possibly good enough for the one-man-band but if itís crew, I would think the blower should run all the time, no?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote H8jer Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2023 at 09:13
Hi 
I have a cheap attwood 3000 turbo fan.
Got it from svb, but their datasheet does not state anything about running it continuously.
But this English Chandler states both continuously and not... (in the Q&A section)
My 370 has an relay below the electric cabinet that powers the fan whenever the 'ignition' is on.
I would always have it running when the engine is running. The exhale from the fan is quite hot so it surely improves the temperature in the engine bay.

I have allready replaced the fan once (have just above 1000 engine hours with my 2008)
But from the thread I get it, that I perhaps should upgrade to a more sturdy and continuously rated fan.


Hanse 370#487 30HP 3-cabin
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Wild View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wild Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2023 at 12:05
We still have the Hanse original ( 2010 and +2500 h) Jabsco 35400 100mm/12V
Running continuously and have a delay relay of a few minutes after switch off the engine ignition.
Not one problem so far.
Wild and Wet
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DJgun View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote DJgun Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2023 at 21:16
Hi Ratbasher,

I probably didn't word my post properly. There are some axial blowers which are continuous rated, but most of the cheaper types at chandlers are not.
Similarly some of the cheaper centrifugal blowers are intermittent rated. The published life of many blowers is shorter than I would like.

When the engine is running it actually sucks in significant amounts of air, including fumes in the engine room. For that reason I don't believe it is necessary to run the blower continuously, but if the blower is continuous rated it gives that option.

Running the blower before starting the engine is to ensure any combustible gases in the engine room are expelled before operating the starter motor,. Running after the engine is shut down is to remove any heat or fumes which may be created by the cooling engine.  The primary reason I changed to centrifugal is that it pumps higher volumes when there is back pressure due to the hoses etc.


Edited by DJgun - 18 October 2023 at 00:26
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