Block to heater hose size | The Z Club of Great Britain
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Block to heater hose size

Discussion in 'S30 (240Z,260Z,280Z) Exhaust and cooling systems' started by toopy, Sep 9, 2017.

  1. toopy

    toopy
    Z Club Member

    Im replacing my screw in coolant outlet stub on the block, is that what its called?! that takes coolant to the heater inlet bulk head pipe.

    Anyway the diameter of the pipe is 16mm excluding the raised ridge/bead, my silicone hose is 16mm ID and slips on easily, a bit to easily!
    Whats the diameter of the OEM hoses? I can get 13mm ID silicone hose but with the bead on the pipe to get past would they be over stretched and deteriorate quicker?

    My existing arrangement has started weeping, the hose is 16mm ID already, but i think the leak is more to do with corrosion on the old pipe/stub than the actual hose.

    Also what sealant should i use on the threads when i fit the new stub
     
  2. jonbills

    jonbills
    ZClub Administrator
    Staff Member Committee Member

    On the block or on the head? I can't think of one on the block.
    I have 16mm or 5/8" heater hose on mine and it's just right.
    Maybe the problem is the silicon hose?
     
  3. toopy

    toopy
    Z Club Member

    Its above the starter motor and the hose feeds the heater inlet
     
  4. jonbills

    jonbills
    ZClub Administrator
    Staff Member Committee Member

    That's the one I was thinking of. I'm sure Nissan will have used 16mm hose. 5/8" hose should be in theory every so slightly snugger.
     
    Last edited by a moderator: Sep 10, 2017
  5. Farmer42

    Farmer42
    Z Club Member

    Just so happens that I have an OEM hose sat in the garage waiting for me to get motivated to fit it to replace my current 'bodge'. Part no. B7181-N3100.

    It's 16mm. I used plumbing PTFE tape on the threads of the 'stub' that attaches to the cylinder head when I renewed mine & it works fine.
     
  6. toopy

    toopy
    Z Club Member

    Great, thanks for that :thumbs:
     

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