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The Norfolk Broads Forum / Broads Boat Owners Q & A / BMC head gasket
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Posted By Discussion Topic: BMC head gasket

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annville
Aug-13-2019 @ 10:59 AM                           Permalink
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Hi TC just to add water contamination in the sump will make your engine oil white/creamy, im sure your son has told you this,changing your thermostat will be the cheapest and easiest, and a 50/50 coolant will prevent corrosion in the engine.John

hedgehog
Aug-13-2019 @ 11:42 AM                           Permalink
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“light hissing when underway a fully competent engineer from a reputable boatyard diagnosed the head gasket problem”

Maybe , with this is mind , it does require a head gasket replacement and condensation might not be the problem . Personally , if access is reasonable , I would replace the gasket , renew thermostat , change oil, filter and coolant , then the job is done properly. My opinion only

tc99
Aug-13-2019 @ 4:25 PM                           Permalink
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  Hi,the white foam/cream is not in the rocker cover,that looks clear it’s actually in/on the coolant header tank cap,I dont appear to be losing any coolant indeed if I top it up at all it would be approx 1 to 2 ozs i.e 50 ml and I always use 50/50 coolant,it’s just something that is pricking my mind so I’m looking for preventative recommendations and thanks all for your advice as well as other members.

annville
Aug-13-2019 @ 12:29 AM                           Permalink
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If you are getting oil in the water no sealant will work, try tightening head nuts or replace head gasket BUT get the head faced/skimmed if you do be for replacing, surprised you can hear hissing while engine is running is the hissing coming from the coolant cap? if so head is leaking gases from combustion chamber into water jacket in which case head gasket is leaking which means head off to check  gasket for leak stain/mark if not head is cracked and new head required.John


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