Madman EMS-3 Operating Manual
Page 31
10.5 Coolant Temperature
Notes to Remember:
The body of the temperature sender must form an electrical return path to the engine block (for single connector
temperature senders). The temperature sender should preferably be on the hot side (head side) of the thermostat
The temperature sender should always be in contact with water – no water means no temperature measurement, hence
the need for the coolant level detector. A low temperature reading does not mean there is water.
There are several ways to fit the temperature sender:
In a spare coolant plug/probe
In a specially made sandwich adapter
In a Madman Delrin plastic hose adapter tube
Directly into a drilled and tapped hole in the aluminium/steel coolant piping/housing
Some engines have unused temperature measurement ports or unused blanked off holes. These are ideal to use for the
temperature sender – check your vehicle’s installation details on the MadMan web site to see if a plug adapter is available
– if we do not list one and you have a spare plug port, please contact us so that we can supply the appropriate adapter.
Some engines do no have any spare ports so we have developed the sandwich adapter which bolts between the water
inlet/outlet pipe and the block/head. The sandwich has a port in it to take the temperature sender. Check your vehicles
installation details on the MadMan web site to see if a plug adapter is available. If we do not list one, we have either not
developed one for your engine yet or it cannot use a sandwich adapter. Either way, please contact us so that we can
supply the appropriate adapter.
Some engines have no option of a plug adapter or a sandwich adapter, these engines need an inline metal delrin plastic
hose adapter or direct drilling and tapping. The inline Delrin plastic hose adapter has two ports, one for a temperature
sender and one for M5 coolant level screw.
A piece of the top coolant hose is cut out and this adapter is inserted in the space, the hoses are clamped to the tube and
the temperature sender screwed in. An earth tab is provided to earth the sender to the engine block. Please contact us if
you have a need for this type of adapter. We will need to know what the inside diameter of your coolant hose is. Some
older engines had large open spaces where it is easy to drill and tap the cooling jacket to fit the probe. Firstly establish
that there is enough free space inside the water cavity to accept the length of the temperature sender (30mm) before
drilling.
Drill a pilot hole (4mm) into the metal surface – as soon as the drill enters the inside of the cavity, water will escape past
the drill bit ejecting the drilling swarf – guard your eyes.
Now drill the hole to 9mm and immediately thereafter, tap the hole to the required thread (1/8 NPT). The 1/8” NPT thread
is a taper thread where the hole gets larger the deeper you tap it, generally the tap should be turned in until 3mm of the
thread of the tap remains outside the hole – you can screw the sender in to check for a good fit.
10.6 Oil Temperature
You can choose to monitor any oil temperature, It is best to monitor the temperature of a potentially problematic
component. If your vehicle has known problems with the gear box then monitor that, and similarly with engine oil etc. It is
wise to monitor auto gearbox oil temperatures as these are known to get hot when working hard.
We make use of plug adapters for most gearbox engine and other temperature measurements.
Please check your vehicles installation details on the MadMan web site to see if a plug adapter is available for your
gearbox or engine sump. If we do not list one and your application can use this type of adapter, please contact us so that
we can supply the appropriate adapter. Some ZF automatic gearboxes will accept a 1/8 NPT temperature probe directly
into the original drainplug hole.
