Silicone heater hose size

[Jamiet]

Hi
Am currently fitting new all silicone hoses. Came to the heater hoses and noted impossible to use the rubber grommets as the silicone hose from a well known supplier is much thicker than standard rubber hose. Anyone think it’s a possible problem ignoring the grommets? I would have thought over time the bare metal would chafe if left un- grommeted. I have the old style valve on mine and on inspection found the ally base plate cracked. This has added to my list of jobs.....

[philthehill]

You must include the grommets otherwise the hoses will chafe on the bulkhead.

It should be noted that later BMC/BL heater hoses are 16mm inside diameter so have a larger outside diameter than the standard 1/2" inside diameter Minor heater hoses.

As an aside - I have just replaced some of the hoses on my Minor and originally purchased good quality silicon hoses to suit - but after fitting decided that the rubber hoses were a better option so the silicon hoses were relegated to the spares shelf and rubber hoses fitted instead.

[Jamiet]

Thanks Phil. Have to say I agree and have done the same and fitted a rubber set. The silicone ones will also remain as spares.

[jagnut66]

Hi,
I have silicone heater hoses and, whilst it was tight, I managed to get them through the bulkhead with the rubber grommets in place, so it can be done.
Best wishes,
Mike.

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