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[Datsun 1200 encyclopedia]

Water Ports

From Datsun 1200 Club

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Categories: Engine Mechanical | Cooling System

Coolant passages are below the intake ports in some A-series Cylinder Heads. They can be large holes or small holes.

Contents

Overview

Water ports keep the bottom of the manifold plenum at a hotspot for complete air/fuel burning, even at low throttle.

994_.jpg

  • A12GX has Four Large coolant holes, one beneath each inlet
    4441.jpgAlbum click to view
  • Other heads have either no coolant holes, small ones, or a mix:
    4444.jpgAlbum click to view
  • Standard Datsun 1200 heads have no coolant holes on the intake side.

Water outlet
14473.jpgAlbum click to view 11093.jpgAlbum click to view

Interchange

A-series heads will interchange with either dry or wet Intake Manifold with the following caveats:

  • If the intake doesn't have coolant passages, tap the head's coolant ports and install plugs
    4444.jpgAlbum click to view
  • If the intake has coolant ports, but the head doesn't, it may bolt on without modifications. Idle and low-throttle running may suffer due to insufficient heat. However, heavy throttle operation should be OK.
    5758.jpgAlbum click to view

Port Plugging

Two methods
* drill, tap and fit plugs
or
* use RTV sealant plugs 

Discussion: H89 water gallery pluging?

Screw-in Plugs

Directions for plugging the cylinder head with blind plugs:
4440.jpgAlbum click to view

Nissan plug parts
99996-H1149 STUD & PLUG KIT 

You can buy grub screws in many places, most auto shops for example. Measure the hole, tap the mext mm up and screw in a plug. A bit of form-a-gasket, copper seal or anti-seize on the threads will help prevent corrosion and seizing.

Nissan Competition head 99996-H1165
99996-H1165b.jpg

RTV Plugs

If your dry inlet manifold comes down far enough to cover the holes, you can use silicone sealer like this:
23478.jpgAlbum click to view
This is an easy way to seal it, but coolant may leak when you change the manifold. Just re-seal it each time. By contrast, blind plugs are a one-time semi-permanent solution.

Used RTV silicone sealer. After fitting the intake/exhaust gasket, before fitting the intake manifold, press some RTV into the water ports, the put a button of goo over it. Let it tack up slightly before fitting the intake.

4848.jpgAlbum click to view 

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This page has been accessed 3,101 times. This page was last modified 05:52, 7 August 2017. Content is available under Datsun 1200 Club.