Krismc
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| posted on 24/4/09 at 06:00 PM |
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Zetec Water rail - what thermohousing??
I bought a rail line water rail 3 years back and it now apears my thermostat might not be opening or its incorrect for the job.
does anyone know what thermo housing it is? what car its out of? and what the temp opening is and if i can change it for anything else??
If all else fails ill sell it and get the Zetec thermo one instead.
[Edited on 24/4/09 by Krismc]
Built, Ivaed, Drove and now Sold - 2011 MNR VORTX RT+ 2000cc Zetec on R1 Throttle boddies.
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big_wasa
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| posted on 24/4/09 at 08:02 PM |
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Qh part No QTH107
92 deg same as mondeo to fit an x-flow.
Ive drilled 3 x 3mm holes at 120deg on mine to allow for warm up by-pass.
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britishtrident
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| posted on 25/4/09 at 07:40 AM |
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No by-pass who ever designed those bling inline thermostat housings didn't really understand how cooling systems and thermostats worked.
Short term measure is to drill a few holes in the thermostat plate --- this will allow the thermostat to work but you really need a proper by-pass
circuit.
Easiest way to do this is fit a Land-Rover external plastic thermostat in place of the one you currently have and plumb the return back the bottom
hose or water pump inlet.
This thermostat open on flow pressure as well as temperature alone.
Available in different operating temperatures.
Grey = 82 c TD%
Cream = 88 c --- as used by MG-Rover
see ebay item 280263161943
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Krismc
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| posted on 25/4/09 at 05:04 PM |
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I have the water rail going to thermostat, the thermostat to top hose of rad, bottom of rad to the water pump.
Then i also have a header tank with the bottom connection of that going to bottom hose of the rad.
I have a further connection on the water rail but is currently blanked, i also have a top connection on the header tank but is currently blanked.
So where are you saying i connect what??
I have removed my thermostat for time being.
Built, Ivaed, Drove and now Sold - 2011 MNR VORTX RT+ 2000cc Zetec on R1 Throttle boddies.
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britishtrident
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| posted on 25/4/09 at 11:04 PM |
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Running without a thermostat is really bad for your engine.
Water/coolant is a not a good conductor of heat for heat to flow to the thermostat your engine needs a continous re-circulation of hot coolant
around the wax bulb for the thermostat to work. In the existing arangement the thermostat dosen't come into contact with hot coolant until the
engine is at or near boling point.
Drilling vent holes in the thermostat will allow some flow around the thermostat which will allow it to open but you really need a proper
by-pass re-circulation between the top of the engine and the bottom hose (or water pump inlet) to avoid hot spots forming inside the engine.
In the engines natural home the Mondeo the by-pass circuit flows quite a lot of coolant, ideally you really should to proviide similar flow rate.
The Rover/LandRover unit would simply replace your existing housing with the extra outlet simply going to a T in the bottom hose to form the
by-pass.
With this type of thermostat when the thermostat is fully open the flow through by-pass is closed channeling all the flow through the thermostat
maximising cooling.
[Edited on 25/4/09 by britishtrident]
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britishtrident
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| posted on 26/4/09 at 09:42 AM |
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Ihn response to questions
They were only fitted right at the end of MG-Rover production intially to the MGTF, 75/ZT.
Landrover had been using sinilar thermpstats for years on models with the TD5 diesel but only later fitted them to the Freelander.
The thermostats car colour coded for temperature.
Grey = 82c
Cream = 88c
Hose connections are all for 32mm bore.
The correct Rover way to fit them is in the bootom hose --- a tee is fitted in the top hose Connected as follows
Connection on its own to raadiator.
Side leg of Y end to water pump inlet.
Straight leg of Y end to the Tee in top hose forming by-pass.
The Range Rover P38 uses a similar thermostat but with a smaller diameter by-pass connection which might be easier to fit. I don't know the
diameter of the hose connection on this type although the by-pass will likely be 16mm/5/8" bore
[Edited on 26/4/09 by britishtrident]
 
Rescued attachment p38.JPG
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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britishtrident
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| posted on 26/4/09 at 09:51 AM |
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Disco TD5 82 degree thermostat
Rover & Freelander stat is similsar but cream indicatin 88 drgree fully opening temp.
 
Rescued attachment prrt.JPG
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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big_wasa
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| posted on 26/4/09 at 11:30 AM |
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So do think this set up will work ?
cheers 
 
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britishtrident
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| posted on 26/4/09 at 05:38 PM |
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that will work nicely
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