Dear Arun - reply to your query, this is not a switch at all (there are no electrical connections, see?). It is just an adaptor made of brass with taper threads. It is supposed to fit into the cylinder head just above the front joint of the inlet and exhaust manifolds. You will have to remove the existing electrically actuated brass adaptor fitted there or you may have to remove the manifold heating pipe type adaptor with its hose, put this adaptor there and use it with the thermocouple type round temperature guage of the 1100 delight. In case of cars with manifold heating, the electrical brass adaptor is fitted on the inlet manifold. You may use this adaptor there, the threads are the same. However, the guage will undersense the temperature as there is no contact with coolant in the cylinder head. Some caution though, when you remove the existing pipe type adaptor from the cylinder head, be careful as that adaptor is made of steel and very often it results in spoilt threads on the head when you try to remove it. The size of spanner is 19 mm. Use a tight fitting ring spanner and hope for the best. If it breaks during removal, you will have to remove the cylinder head and take it to a good turner to knock out the remaining portion. So try to remove it but don't force it. If it does not come out, refit the hose and leave it. In order to avoid all such hassles, it is adviseable to make a hole on the vertical side of the top tank of the radiator facing the engine (above the alternator area) and solder this brass connector to it. You just have to ensure that the thermocouple coil is long enough (usually it is). If you decide to do it, you can get such adaptors with same internal threads required (it is a non-standard size, it is M8*1.0 and not M8*1.25) but having smaller external threads. Ask at an oldie type shop, you will get it. It may be from the old Matador or some such vehicle. You can then merrily grind the outer threads off before soldering it so that the hole diameter you make in the radiator is as small as possible. Also, please take the temperature guage and completely insulate its thermocouple by wrapping it up in plastic non adhesive tape (black tape made by Notre, used by any auto electrician and can be bought from any auto parts shop). This will prevent short circuit due to its metallic core coming in contact with any wire. You will have to do this before you fit the temperature guage on the car.
I have done the cylinder head transformation in my left hand drive car MH01YA3238, in my super select MRY3112 and in my 1967 delight MRF6466. I guess I was very lucky, the connectors came out in one piece everytime except in the LHD where it broke with just one thread remaining, so I was able to knock it off with a good pair of 6" Taparia pliers. These are tricky jobs, best done yourself rather than giving it to any garage.
Best regards,
Behram Dhabhar |