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Old 17th December 2014, 13:08   #21
maxxpump
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Quote:
Originally Posted by moorhouse.family View Post
Thanks T-Cut just what I needed. Car running at 48 degrees on coolant. New stat required. Question is now OEM or in top hose.
I've just done the top hose mod with a renault 5 stat that you can get from DMGRS, much easier and cheaper to get too than the OEM stat and far cheaper. Did the trick now running at operating temperature again and gained 8 MPG in the process! Even if its temp, its worth a shot! mind you mine is a diesel! if yours is the unleaded rover powerplant, than the stat is not that hard to get to and if a hour job (thats what I heard on this forum....)
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Mods done: 160 upgrade, EGR bypass, Viton "O" rings, Fitted 16" unions, cleaned manifold, uprated air filter, fog lights, better bulbs, upgraded ICE and full speaker set up.
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Old 17th December 2014, 14:30   #22
T-Cut
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There's been a couple of reports that replacing the diesel OEM stat with another OEM one is likely to follow a similar deterioration over subsequent months. At least the in-line system is easy to replace if that stat fails.

TC
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Old 17th December 2014, 19:54   #23
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Hi T-CUT
If you were to do this mod

Do you leave the original thermostat in position even if it's working correctly
Does the engine run ok with two thermostats fitted (if the answer is yes to the first question)
Thank you
Regards
Steve
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Old 17th December 2014, 22:57   #24
T-Cut
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Originally Posted by steveo View Post
Do you leave the original thermostat in position even if it's working correctly?
Yes, the original stays put.
EDIT: Of course if it was working correctly, there'd be no need for the modification. The problem is they start opening prematurely, so preventing the engine warming to the correct running temperature (around 90C or so)

Quote:
Does the engine run ok with two thermostats fitted (if the answer is yes to the first question)
As evidenced by hundreds of owners with the in-line system, yes it works just fine. There are lots of threads going into the details if you need more.

TC

Last edited by T-Cut; 17th December 2014 at 23:16..
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Old 18th December 2014, 15:56   #25
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Hi TC
Thank you for your reply
Mine doesn't appear to get above 80 degrees but I don't know enough about the diesel to comment.
Regards
Steve
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Old 18th December 2014, 18:38   #26
T-Cut
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The OEM diesel stats originally open at 88C nominal, but over time start opening earlier. I'd say yours is starting on that path and an in-line one could make a difference.

TC.
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Old 19th December 2014, 11:00   #27
Kennyeth
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Hi Steve,
When the diesel CDT is running at normal temp, your gauge needle will be at the 9:0 o-clock position.
Mine needs doing, keep putting it off, my needle is around the twenty to position.
Ken.
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Old 19th December 2014, 13:43   #28
T-Cut
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Quote:
Originally Posted by Kennyeth View Post
When the diesel CDT is running at normal temp, your gauge needle will be at the 9:0 o-clock position.
That tells to it's at 75C or higher. It doesn't tell you if it's optimal (90C). Only the diagnostic routine or a proper temperature gauge will do that.
Remember 'normal' on the gauge means anything from 75C to 115C, so it's basically useless.

TC
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Old 19th December 2014, 13:48   #29
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Quote:
Originally Posted by T-Cut View Post
That tells to it's at 75C or higher. It doesn't tell you if it's optimal (90C). Only the diagnostic routine or a proper temperature gauge will do that.
Remember 'normal' on the gauge means anything from 75C to 115C, so it's basically useless.

TC
I see.......appologies
Ken
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Old 19th December 2014, 16:19   #30
T-Cut
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I see.......appologies
Not needed! The temperature gauge gives a false sense of security to the vast majority of owners, so knowing that it tells you very little is a useful thing to know.

TC
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