High Performance Radiator Hose Adaptor for Water Temp Gauge Sensor (to suit 40mm inside Diameter hoses) .
(32 mm ,34 ,36,38 and 40 mm sizes available for immediate delivery , please see our other listings)
This is a CNC machined , billet aluminium adapter designed to mount inline into a 40 mm Inside Diameter radiator hose.
This will allow you to fit a 1/8" NPT threaded water temperature gauge sensor in your radiator hose.
This could be useful if you are looking to add an auxiliary water temperature gauge but do not have a port in the intake manifold or water pump to mount the sensor. The adapter also includes two stainless steel hose clamps
The 1/8 NPT thread water temperature adaptor comes with a crimp/ring style electrical connection point and stainless steel radiator hose clamps.
Installing the Adapter
Installing the adapter is fairly simple, but it would still be a good idea to read completely through these instructions prior to starting the install.Tools required: Cutting tool, screwdriver or hex socket, spanner or socket to fit your temperature sensor, terminal crimper
1) Choose the location on your radiator hose where you want to install the adapter. Hold the adapter up against the hose to make sure you will have enough room for it and for the sensor you plan to use.
The adapter should be mounted in a straight section of the hose; this straight section should be at least 100 mm (4 inches) long.
2) Mark the location on your radiator hose where you wish to install the adapter. Keep in mind that inserting the adapter into your radiator hose will make it 25 mm (1 inch ) longer. If you would like to keep your radiator hose at its original length, the best method is to choose the location where you want the sensor to be, then make marks 12.7 mm (1/2”) to either side of that location. When you cut the hose, you will actually make two cuts, one on each mark you made earlier. This will cut a 25.4 mm (1 inch) section out of your radiator hose, so when the adapter is installed, the hose will remain at its original length.
3) Make your cut(s) in the radiator hose. If you have enough clearance, you do not need to remove the radiator hose from the vehicle first, but be aware that if you do not, when you cut into it you will probably spill some coolant.
As such, do not try this when the engine is warm, and please be sure to clean up any spilled coolant immediately – the sweet smell can attract wild animals, house pets, children, etc. and is lethal if swallowed.
4) Insert your sensor into the adapter. Note: The threads on the adapter are tapered to ensure a good seal. As such,the sensor will probably not screw all the way down into the adapter – this is normal. Just screw it in until it is tight;
If you attempt to screw it all the way in, you will damage the adapter and/or the sensor. You may use thread sealant if you wish, but be aware that if your sensor obtains its ground through the body of the sensor, the sealant may prevent
the sensor from grounding. If the sensor you are installing does not provide its own ground, you will need to provide a ground to it. (See the “Grounding the Sensor” section below.)
5) Slip a hose clamp over both sections of the radiator hose you just cut, insert the adapter, position the hose clamps and tighten them down
6) Make the electrical connection to your sensor. If you are relocating the original sensor that came with the vehicle to the radiator hose, it may be necessary to lengthen the existing wirer/connector by splicing in a section of wire (not included) in order for it to reach.
Please be aware that no coolant will flow through your upper radiator hose until the thermostat opens. Therefore, a sensor mounted in the upper radiator hose will read under-hood temperature until your thermostat opens, at which point it will begin reading the engine coolant temperature.
Grounding the Sensor
Most temperature sensors require a signal wire and a ground. Some sensors provide their own ground, in which case there will be two (or more) wires running to the sensor.
However, the vast majority of temperature sensors expect to get their ground via the body of the sensor itself. (If you are not sure what type of sensor you have, consult your sensor
documentation or factory service manual.) Most sensors of this type are screwed into the intake manifold, water pump or engine block, all of which are grounded.
However, when you install a sensor in the radiator hose, it is isolated from the engine ground by the rubber radiator hose. In order for the sensor to function, you will need to provide it with a ground.
Crimp a round headed crimp connector to the end of a wire (18-22 AWG size would be fine) Run the 18-22 gauge wire from this terminal to a convenient spot on the engine or body which is grounded.
(You will need a crimping tool to connect the wire to the terminal.)
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