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The Norfolk Broads Forum / Broads Boat Owners Q & A / bmc 1500
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Posted By Discussion Topic: bmc 1500

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teddy
May-03-2007 @ 12:16 PM                           Permalink
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Hi all, i am a new member, and have been veiwing this site for several months soaking up all the threads and learned a lot, we have just bought a boat with a bmc 1500 engine with raw water cooling, does this have to be winterised with antifreeze and if so what do i have to do, we are moored at broadsedge in the new part, boat is a fjord 27 "SHANDRA" any info would be gratefully reicieved. thanks in advance
Ted

Antares_9
May-03-2007 @ 12:36 PM                           Permalink
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Welcome.

Not in the same sense as an indirect cooled engine, but it is still a good idea to run some through for where water may lie trapped and do some damage. If you have a skin fitting you can take off the hose after turning off the seacock and put the hose in a bucket of premixed antifreze, then run the engine until it comes out of the exhaust. You will need to make some provision to catch the mixture as it emerges both when you do the job and when you first start on recommisioning. You can always introduce it through one of the top hoses or thermostat housing but I am always concerned about getting it in the exhaust ports and into the cylanders using that method.

Meus stilus es pelagus testes

Cat philosophy:
Life was sweet for a broads ships cat

teddy
May-03-2007 @ 12:53 PM                           Permalink
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Thanks for that, it sound very complicated but next time i am at the boat i shall study the engine and and try and make sense of what you said.

Ted

billmaxted
May-03-2007 @ 3:09 PM                           Permalink
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Hi Ted and welcome,

Most BMC's have both an indirect coolant round the block and raw cooling to the exhaust, some have bilge coolers as well which some folk refer to as 'indirect' so you really need to get someone on the yard to put you right as to exactly what you have got.  I think you may well find that there are other forum members not very far away.

At this time of year it is important that the anti freeze is up to strength if you do have a heaader tank of any sort as this is also an inhibiter.  With respect to my fellow member there is no need to start taking pipes off in the winter just pour neat antifreeze down the top of the weed trap with the engine running and the seacock turned off until you get blue water coming out of the exhaust all you are doing is to ensure that any amount lying in the exhaust is unlikely to freeze.  

Antares_9
May-03-2007 @ 3:22 PM                           Permalink
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No, Bill is of course right, no need to take the hose off you can bung it in the strainer, thats what I do myself, don't know why I said take the hose off obviously not thinking. Even if you find it is not directly raw water cooled as you thought, it is still a good idea to do inhibit the raw water side of the indirect system anyway, especially if you have a tube stack heat exchanger which are expensive and can suffer frost damage.

Meus stilus es pelagus testes

Cat philosophy:
Life was sweet for a broads ships cat

B17
May-03-2007 @ 3:36 PM                           Permalink
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Ted,

First welcome to the site and the madhouse of Boat ownership.

Winterisation is not a dark art and in truth is a very simple process that can normally be achived in just  a few mins. We use our boat all year round and can winterise/dewinterise the engine in less than 10 mins.

Help is at hand and there are quite a few site members who also moor at Broadsedge who I am sure will be able to put you straight after a brief inspection of your installation. We Moor down the road at Richardsons and if winter is approaching and you are still not sure what to do I will only be too happy to help out if reqd.

By buying a boat you have joined a club of like minded folk who are generally prepared to help each other out. Get chatting to other owners at your moorings and you will find that any problems you have will have been seen and solved by them before. If not David will sort you out.

I dont know your particular boat but the normal set up for a BMC engine is as follows.

Fresh water is circulated around the engine to effect the cooling so you need to identify where to top up this water much as you would in your car but without a radiator. This water needs an anti freeze mix which remains in the engine all year round (just the same as a car).

The fresh water is cooled by raw water (river water) which is sucked into the engine via your sea cock and weed filter and then cools the fresh water via an intercooler and is then blown out with the engine exhaust. When winterising a 50/50 water/ anti freeze mix needs to be introduced into this system by either the method David (Antares_9) described or by the following method if it is practicable.

Mix up the anti freeze water mixture ( I use a normal drinks 2 litre drinks bottle for this).
Shut the sea cock.
Remove the top off the weed filter ( clean the filter at the same time).
Start the engine and pour the mix into the weed filter to replace the cooling water as the engine is running (be careful of belts etc during this process).
Stop the engine before the water/anti freeze mix is exausted (mine only reqires about a litre so 2lts should be more than enough).
Stop the engine and replace the weed filter and weed filter top.

Ta Da

Engine winterisation complete.

For de winterisation simply open the sea cock and start the engine and check that there is raw water being ejected with the exhaust.

If You have a system (rare on a broads boat) where there is no fresh water cooling then simply omit the first part of what I have said above.

The other part of winterisation reqires the draining down of the domestic fresh water system on the boat.

First run the taps dry.

Then locate the lowest part of the water system both hot and cold and break the pipe unions (usually  plastic acorn fitting which just hand screw together ) and let this drain into the bilges.

Although I always leave my pipes broken it may be wise to re make the joints before you leave the boat just to gaurd against forgetting them in the exitement of starting up the boat in the spring and having a flood when topping up the domestic tank.

Sounds complicated but I can achive all the previous in less than half an hour and be shut down or underway in that time.

Good Luck

Rod

You mean the other Starboard then...

B17
May-03-2007 @ 3:39 PM                           Permalink
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I think while I was typing my reply Bill covered anything I had forgotten to mention.

Rod

You mean the other Starboard then...

essexboy
May-03-2007 @ 9:06 PM                           Permalink
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I must say I worry that people still put antifreeze in the raw water system. It goes in the river on start up !
Anti freeze is a poison, not only to humans. You can get "friendly" stuff but I have never seen it for sale.

George Sims

Antares_9
May-03-2007 @ 9:11 PM                           Permalink
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T quute from my origonal post
"You will need to make some provision to catch the mixture as it emerges both when you do the job and when you first start on recommisioning"

Meus stilus es pelagus testes

Cat philosophy:
Life was sweet for a broads ships cat

Glen_Mist
May-03-2007 @ 9:14 PM                           Permalink
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I may have been misled, but i'm sure that i read somewhere that Russians use cheap vodka for anti-freeze as it does the same job and is about half the price. Another plus point for broads use is that, being basically all natural ingredients, it is bio-degradable, mind you i could be wrong on that.
I am not suggesting than anybody try this, as vodka wouldn;t have the rust inhibitors, etc (and i can think of many a better use for it) but i thought that i would just throw that into the mix.

Chris J

"Darling, where is that water coming from?"

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