correct thermostat for 1988 3.5 - Defender Source
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  #1  
Old February 18th, 2014, 11:07 AM
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correct thermostat for 1988 3.5

I looked through the threads and my references but cannot find the recommended thermostat temperature for my 1988 D110 with the 3.5 carburetted engine. Is it 180 degrees or 195 degrees? something else.

Also it looks like the thermostat housing is at the front of the intake manifold where the upper radiator hose attaches. Can someone confirm?

thanks.

Surprisingly the 90/110 shop manual I have is missing most information on the 3.5 engine. I need to find a better manual.
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  #2  
Old February 19th, 2014, 08:24 AM
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J. Michael McCaig
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For a carb equipped Rover V8 you can use 180F thermostat year round or install a 195F for the winter and a 160F in the summer. Fuel injected run the 195F year round. Rovers North part # for the 180 is PLH386 or you can go to the local auto parts store and buy one for a 1962 Buick Special 215 if they still have a listing. You will have to make a gasket as the housings are a little different. Yes, the thermostat is where the top radiator connects to the intake.
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Old February 21st, 2014, 05:39 AM
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Tom Rowe
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Quote:
Originally Posted by LRover View Post
Fuel injected run the 195F year round.
195F is too hot. The manual says the thermostat is ok if it's open between 85c (185F) and 89c (192F).
A 195F only starts to open at 195 and isn't fully open until over 200. At least all the domestic ones I've tested are like that.
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  #4  
Old February 21st, 2014, 07:35 AM
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J. Michael McCaig
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Agreed. I changed the thermostat in my '95 RRC to 180f. Might be running a little rich because of it, I don't know, but I rather have that then being close to overheating from the begining before it ever works hard.
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Old February 22nd, 2014, 08:11 PM
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akrockhound
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thanks

Rovers North sells the 88C/190F thermostat (RNC047) for the 3.5, 3.9 and 4.0 but my shop manual shows a 82C/180F thermostat for the 3.5.

I believe the fuel injected engines are set up to run a few degrees hotter than the carb ones. My Disco II runs pretty steady at 193F and can go up to 203F when I lug or city drive so I suppose its a 195D thermostat.
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  #6  
Old February 22nd, 2014, 08:26 PM
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Keith Armstrong
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Curiously enough the efi 3.5 in my 1980 SD1 used a 82 degree thermostat.
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  #7  
Old February 24th, 2014, 08:23 AM
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J. Michael McCaig
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The higher temp t'stat in the later FFI engines was to reduce emissions.
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