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The Norfolk Broads Forum / Broads Boat Owners Q & A / BMC1.5 fluctuating oil pressure
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Posted By Discussion Topic: BMC1.5 fluctuating oil pressure

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waterbuoy
Aug-20-2016 @ 9:04 AM                           Permalink
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I suggest you take a look at this thread

It contains a number of ideas.

Clive

Home - IP11 & Away - NR12

ruby
Aug-20-2016 @ 9:18 AM                           Permalink
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Hi Clive

Thanks for this. It looks like I need to check the lift pump issue . As far as I remember we have never had a problem with diesel in the oil but I have not checked it either.

Thanks again

Graham

ruby
Sep-02-2016 @ 8:02 PM                           Permalink
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Just to let everyone know we did have diesel in the oil and we have had the lift  pump replaced ( even though it was nearly new ) and the oil pressure seems to have stabilised.

A useful tip for others is to put a cable tie round the dip stick at the point where the engine is full of oil and the dip stick is measuring maximum. If you just let it clunk to the bottom ( as I know many people do ) then it is not very easy to see whether there has been a sudden increase in oil . Or should I say oil diesel mix.

Thanks for the helpful clues.

Graham.

Ps the thread should of course say BMC not Bec oil pressure

spiderman
Sep-05-2021 @ 10:33 AM                           Permalink
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Morning All.
My oil pressure gauge has started fluctuating fairly rapidly on first start up for around a couple of minutes, then settles steady slightly lower than normal.
Oil appears normal with no increase in amount up the dip stick, so I thought I'd start with an oil and filter change.
In the manual it recommends several different grades of oil so I thought I'd ask what the general consensus is for the best oil for the good old BMC.
I'm sure that will bring many different answers, but if you think a particular oil  that might help this particular problem I would be most grateful.







annville
Sep-05-2021 @ 12:37 PM                           Permalink
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Hi On the side of the block there is a large domed cap above the oil filter housing undo this nut carefully under there is a long spring on the end is a aluminium piston this seats on a recessed face, this controls the oil pressure they can get stuck/with debris remove inspect it may need lapping in a close inspection will reveal all. John

spiderman
Sep-05-2021 @ 3:12 PM                           Permalink
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Brilliant, thank you for that.
Can I ask what you oil of preference is please?

annville
Sep-05-2021 @ 6:32 PM                           Permalink
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Hi Spiderman I use Castrol inboard 4T 15W/40 marine engine oil part no SKU 00010472  not cheap but it has additives to help oil to cling to engine surfaces plus anti corrosion inhibiters when engines stand for long periods you can get it from  OPIE oils.co.uk Phone 01209202944 they are at Redruth,  it comes in 4lt cans John


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