Manky Monkey Motors

Hi everyone
   Just wondered if anyone has info regarding a thermal switch to turn fan on/off.

1st, do you know what thread size/pitch the original reliant temperature sender is?

2nd, do you know of an alternative switch unit that will fit in its place to turn fan on + off?

Cheers
 8)

1st
Thread ; 5/8 by 18 UNF
2nd ;
got a link somewhere  :-[
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Thanks for that Fifer, looking forward to the link.....how did I know that you would be first to respond  ;) ;D

I would also like to know the optimum temperatures that a switch would work from :)

 I have just added the following info to my website in the last few minutes  :)
 
https://sites.google.com/site/fifersrelianthintsandtips/fan-electric/fan-various-electric-options/fan-electric-computer-fan-r3w-post?pli=1
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Note the advice given by " wheaters " to place  the thermostat in the bottom radiator hose  :)
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Here is another fan switch link
http://www.ebay.co.uk/itm/25MM-HOSE-ADAPTOR-ELECTRIC-COOLING-FAN-SWITCH-VITARA-SJ-413-SJ413-SAMURAI-MLR-JO-/150819476965?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item231d8a95e5

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Thanks for that Fifer.
Ive already got the electric fan fitted now looking for a thermal switch to operate it. I was hoping to find a 3/8" x 18 unf swicth unit to replace the original Reliant sender unit.

added to my list is that ;) also means i can keep the temp gauge off the original sender.

I dont want to bother with a temperature gauge, just want thermal switch to turn fan on/off

If you need to replace the temp sender in the future then the following info might help  :)

https://sites.google.com/site/fifersrelianthintsandtips/water-temperature-sender

WATER TEMPERATURE TRANSMITTER

Thread ; 5/8 by 18 UNF  { This transmitter has a RED top }

RELIANT ; Part Number ; Still To Find               
LUCAS ; Part Number ; SNB105
DELCO ; Part Number ; 7966267
DELCO ; Part Number ; SU15
LAND ROVER ; Part Number ; PRC7918
PSA ; Part Number ; 1205552
SMITHS ; Part Number ; TT4802/00A
SMITHS ; Part Number ; A TT05

MANUFACTURER ….. MODEL ….................... YEAR From ….. YEAR To

ASTON MARTIN ............. DB5 , DB5 V8 ................  Sep 1967 ............. Nov 1976 ,

................................... Vantage .......................  Sep 1967 ............. Nov 1976
HILLMAN ..................... Avenger .......................  Feb 1970 ............. 1976         
................................... Hunter .........................  Oct 1966 ............. 1977         
................................... Imp .............................  1963 ..............................
................................... Minx .............................  Aug 1969 ............ Sep 1970   
HUMBER ...................... Sceptre , Arrow  ............  1963 ..............................
................................... Hawk , Super Snipe ........ 1964 ................... 1967       
JAGUAR ....................... Daimler Double Six 5.3 ... 1975 ................... 1980             
................................... Daimler Limousine ......... 1972 ................... 1975           
................................... Daimler Sovereign 2.8 .... 1970 ................... 1974                     
................................... Daimler Sovereign 4.2 .... 1971 ................... 1980               
................................... Daimler E type 4.2 ......... 1971 ................... 1974                     
................................... Daimler E type 5.3 V12 .. 1971 .................... 1974           
................................... XJ6 ... 2.8 ..................... 1970 .................... 1973
................................... XJ6 ... 4.2 ..................... 1971 .................... 1975           
................................... XJ12 ... 5.3 ................... 1970 .................... 1973         
SUNBEAM .................... Alpine ........................... 1965 ................... 1971         
................................... Rapier .......................... 1965 .................... 1971     
................................... Imp Sport ..................... Oct 1966 .............. 1971               
................................... Stilleto ......................... Oct 1967 .............. 1971                     
................................... Tiger ............................ 1964 .................... Feb 1967                   
TALBOT ....................... Hunter ......................... 1978 ....................................
RELIANT ...................... Fox .............................. 1983 .................... 1990                 
................................... Kitten .......................... 1975 ..................... 1983                     
................................... Rebel 700 , 750 ............. 1969 ..................... 1973                 
................................... Rialto ........................... 1982 ..................................             
................................... Robin 750 , 850 ............. 1973 ..................................         
TRIUMPH ..................... Spitfire 1300 , 1500 ........ 1967 .....................1971   
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hey,, pete,,, if you find one to go in place of the original temp sender ,,get us one please ,, or let us have the part number as i,m wanting to do the same ,,

if not i,ll try and make a stat housing to take one like a ford fiesta,,,

Mine is in the rad but my rad is an r6 ats from an alto
 :)

Pete will some think like this do if you cant get the 5/8 one..

http://www.ebay.co.uk/itm/Thermal-Fan-Switch-Thermostat-Electric-Cooling-Fan-30mm-MG-B-Triumph-Austin-/230792164756?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item35bc48f594

Hi Terry
   Ive seen those but Im not willing to spend £30+.....maybe Im tight :)

No just carefull  ;)
do you know any one thats got a helicoil kit have it drilled out for this

http://www.cbsonline.co.uk/product/Fan_Switch_87C%7C82C_M14_x_1.5_FANSW

I saw quite a few where you stuffed a cable/probe into the water flow of the rubber pipe and just clamped it with the jubilee clip. I wasn't happy with that so splashed out (no pun intended) on an ali T piece bit from Mini Sport, just split rubber tube and slide on each side of the T (passes straight through) and the switch sits in from the top. Just wire straight from thermoswitch to Subaru fan :)

which switch did you use nabs?? mind i supose if you use the split pipe route the thread is a common one.

Tight/careful = skint :) I saw one of these earlier today and thought I may use one. I plan to tap an m14x1.5 thread into a bit of steel pipe and put it into a radiator hose. One of Fifer's links makes sense about having it in bottom hose of reliant motor, it may help you with your honda motor. Ive only got an m8 helicoil kit.

Hi Nabs
   Ive seen the type you mentioned and I didnt think it very good. I think i'll use one of the M14 x1.5 fan switches as per Terry's link, most of the other cheaper makes/models seem to have an M22 thread for which I dont have a tap :( Ive already got a steel pipe connecting 2 lengths of my bottom hose (see fifer's links) so I'll only need to drill/tap to suit, hopefully that'll sort it.

I thought it was from Mini Sport OAB but just looking I can't see them, this is what it is though except the one I ought had the thermos witch already in it so it was complete ( it shows them on this page) http://www.merlinmotorsport.co.uk/p13457/25MM-HOSE-ADAPTOR-WITH-1/8-NPT/product_info.html

have you seen these? they can drill/tap a thread of your choice
http://www.cbsonline.co.uk/product/In-Line_Temp_Sender_Housing%7CAir_Bleed%7CDrain_25mm_INT25

that works out dearer than the one i showed you.
unit £24 inc .£5.00 for the tapping. £6.00 pp. = £35.00 . you don't get rad switch or jubilee clips

Im going to make my own adaptor/joiner to take the m14 switch :)

While you at it Pete make a few. and flog them on here  ;D

Could you just drill and tap the radiator and fit a switch?
320928518312 (eBay number)

i thought that then ruled it out as the rads to thin,,

Water pump then ?

i did think of cyl head near  stat  housing,,

I jus left the fan on mine

i found a reducer on ebay 5/8x18unf male to m14x1.5 female   would fit in the head where the temp sender is then need to find a m14 fan switch

Hi O-A-B. have you a ebay link or number for this item

If you ask Doc nicely, he might make you one  ;)

Thats a good idea :)  May sort out an alloy threaded insert and weld it in.

try here   http://www.cbsonline.co.uk/product/Fan_Switch_87C%7C82C_M14_x_1.5_FANSW   

ive had a brain wave pete, you have the alloy rad same as me, mine has a drain tap on the bottom right hand side, havent measured the thread size yet but i remember its around m14 ish size....... ;)

sorry terry i thought i had  saved it in my watch list but didnt, now i cant find the bugger, im sure it was from demon tweeks though

This one
http://www.ebay.co.uk/itm/190668486697?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

no that one has a 5/8 female, could be used but you would need also a 5/8unf male/male to put in first, ile keep searching the one i found was 5/8male m14 female

221048890541

This one

thats got a 5/8 female aswell. or is the description deciving??

You want the stat on te outlet side OAB not the bottom

never thought of that nabs ::)  i think ile eventually do as fifer said 20 posts ago and put one in the bottom rad hose, i spoke to the local with a reliant trike he has tapped out the sender in the head and fitted a switch in 4 years the fans come on once,and that was when he was changing the coolant, so looks like the rocker switch will do i just thought id be turning it on /off alot more than that. ive got a temp gauge so if im stuck in traffic i can just swich it on to keep her cool untill im moving again

I wonder about that. Isnt the point of the wax thermostat / cooling fan to control the engine temperature? 

This is my thinking....

• The wax stat opens at a set temperature and is operated by the engine water jacket temperature. This allows water to the radiator to be cooled.
• If you put the sensor in the radiator return pipe the return water temperature will be regulated to the sensor activation temperature  - that would be the expected engine out water temperature.
• The engine will now be getting a much higher return water temperature than with a conventional mechanical fan'
• As the wax stat is already open it can do no more to ask for cooling'
  
• This will result in an overall higher temperature in the engine, and an engine outlet temperature much higher than expected?

I think the result of moving the sensor will be to run the radiator at a constant outlet temperature, and the maximum radiator inlet temperature (ie the engine outlet temperature) will not be controlled.

When i wired up the pop.  the fan switch was on the bottom of the rad on the opposite side to the hose

   
thats what i thought of doing,as i have the alloy rad it has a drain plug at the bottom opposite side to the bottom rad hose

The purpose of the wax stat is to allow the engine to get to an optimal working temperature before allowing the coolant to go to the rad to cool down.

Yeah, thats my point.
Once its open it can do nop nore, so if the water returning from the rad is the temperature that the stat allows out, as the fan is not coming on till then, wont the engine temp rise further ?

Correct  :)


Reliant vehicles normally run best with an 88 degree thermostat and as OAB SAYS  The water from the open stat will be a minimum of 88 degrees when it flows from the head to the TOP of the rad .
It then drops /is sucked downwards through the rad getting cooled on the way down by the mechanical fan and the air coming in through the front of the car to the front of the rad when the vehicle is moving
The temperature in the engine bay on the 3 wheelers is quite high and with the mechanical fan on all the time this is normally enough to stop overheating when the vehicle is stationary for long periods of time in traffic jams .
Note that all Reliant engines should be run with antifreeze at the correct mix all year round { Not called Summer Coolant for nothing  :)}.
The water going back into the engine via the bottom hose is cooler than that going in at the top .

On an open trike you have a slightly different scenario .
{ 1 } You do not have the engine enclosed in a fibreglass box therefore , when moving , you get some air cooling on the engine as well as via the rad
{ 2 } For cosmetic { Not wanting to have to build a guard round the fan so that unattended morons and kids do not get their fingers broken  ;D } or slight power gain the mechanical fan is removed

An electric fan , if fitted , has no brains and needs to be told when to come on and off .
Picture the scenario ;
The temp from the engine to the top of the rad is a minimum 88 degrees after the thermostat opens .
The temp at the bottom of the rad is a less than 88 degrees due to being cooled by the air flowing through the rad .
If the temperature at the bottom of the rad rises that means that the temp at the top is obviously much higher .
So if you put the electric fan sensor in the bottom hose and set it to come on at a lower temp than 88 degrees then the fan will kick in .
After warming up fully and after a run , if you use one of the following to check the temp at the top hose and at the bottom hose ,you will know what temp to set the sender at { Which I assume would be set at normally a degree or so above the normal temp in the bottom hose ?}
http://www.ebay.co.uk/itm/NEW-Non-Contact-Digital-IR-Infrared-Digital-Thermometer-With-Laser-/180906684657?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item2a1ee0f0f1
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If someone does buy one of the above digital thermometers I would be interested to know the temp difference between the water in the top and bottom hoses as I do not have a clue  ;D ;D
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The thermal switch to operate my electric fan will come on at 87deg and off at 82deg, its fitted in bottom hose.....will this be ok? Oh why didnt Reliant make an aircooled motor ::) :)

Sounds about the temperature range  :)
If your fan comes on at 87 degrees in the bottom hose then I wonder what the temp in the top hose would be as it will obviously be hotter than that ?.
That is where we need a guinea pig to buy one of the aforementioned infra red thermometers to find out  ;D ;D
While I said that the Reliant lump is best suited to an 88 degree stat { because you get the oil up to temp and lessens the chance of mayo in the rocker cover} , some Owners run with an 82 degree stat in .
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Used to use those thermometers in the chicken sheds to measure the difference in floor temperature and ambient air temp, normally when chicks came in so we could adjust the house temp to give them the best start..

They were very accurate.

We used them in the quarry but they were fairly expensive then

thats where the one i had came from  ;) ;) ;)

i know its took a while but ive found the reducer 5/8unf to m16x1.5 check....270875799967   then a mazda/subaru fan switch will fit also on ebay...130664514132

dont think those 2 items will go together...
       Gauge adapter M16 x 1.5 Male to 5/8 UNF female. Adapts 5/8 UNF capillary water gauge pipes into M16 x 1.5 takeoffs.

the sender is also male thread M16 x 1.5

i would have thought to fit reliant motor the adaptor would need to be UNF male thread ???