Thermostat, I know sorry but confused

[clf]

Originally Posted by pletevl

What worries me is that there is no flow of coolant near this thermostat, the only way the thermostat is going to open is when the water near it reaches 88 degrees by heat dissipation, for that water to reach 88 degrees surely the engine must get really hot ?

Mine works. And those top hose attaches to the engine. The thermostat once installed is about 6inches from engine block.

The water comes from engine block through top hose, when stat is open, ie temp has been reached, it flows to the stat which will now open, then to top of the radiator, to flow to the bottom to be cooled, as normal.

Mine before It was fitted, reached72 degrees at best, now will reach 86 :-)

[pletevl]

Didn't know it was that close to the engine

[Mr (Z) T]

Originally Posted by berkshirelad

No need to grind anything off; that's why you need silicon grease and a short length of household waste pipe - so you can tap it home without hitting the bulb.

The hose reduces in diameter further down, so you don't really need the second clip

+1 this is exactly what I did

Originally Posted by clf

Mine works. And those top hose attaches to the engine. The thermostat once installed is about 6inches from engine block.

Mine before It was fitted, reached72 degrees at best, now will reach 86 :-)

Mine is about 3-4 inches from the block and runs at 88c consistently via OBD, before it wasn't even reaching 60c!

[clf]

Originally Posted by Mr (Z) T

+1 this is exactly what I did



Mine is about 3-4 inches from the block and runs at 88c consistently via OBD, before it wasn't even reaching 60c!

Well when I say six inches, it is more likely half that, mine stopped moving when the bulb went just beyond the end of the hose. I do wonder, if I was able to move it slightly closer to the radiator, would the temp rise to the magic 88?

I do have a question or two about this, has anyone had one fail after a period of service? How difficult was it to remove? (Although I would imagine by that stage, the hose should be replaced anyway). Also would i be correct in thinking, if it were to fail closed, the car would overheat, and therefore be easy to spot? (well the diesels, rarely overheat, if ever!)

[pletevl]

OK, so I will be doing this, what difference will I notice after ?
my car sits around 76 degrees at the moment

[wuzerk]

Originally Posted by pletevl

OK, so I will be doing this, what difference will I notice after ?
my car sits around 76 degrees at the moment

You should see temperatures between 83C and 88C depending entirely on how hard the engine is working i.e. you will never see 88C unless slogging hard up a hill etc. When you drive off load down the other side of the hill it could drop to 82-83C. You could fit a higher rated thermostat than 88C but the diesel engine will rarely get hot enough to open it for a very short while.

[wuzerk]

Originally Posted by clf

Well when I say six inches, it is more likely half that, mine stopped moving when the bulb went just beyond the end of the hose. I do wonder, if I was able to move it slightly closer to the radiator, would the temp rise to the magic 88?

I do have a question or two about this, has anyone had one fail after a period of service? How difficult was it to remove? (Although I would imagine by that stage, the hose should be replaced anyway). Also would i be correct in thinking, if it were to fail closed, the car would overheat, and therefore be easy to spot? (well the diesels, rarely overheat, if ever!)

First question: NO the new stat is immersed in water at all times.
Second question: If the additional thermostat failed in the closed position (never seen a report of this so far, the modern wax type do not fail shut as a rule) the engine would eventually boil. The stat would be easy to extract from the pipe and there should be no problem with fitting a new one. A new hose comes with the plastic fittings complete so you would have to cut the clamp off again.
It is worth noting that our diesels, with 50/50 anti freeze mix and under 15lbs pressure will not boil until 135.6C.

[clf]

Originally Posted by wuzerk

First question: NO the new stat is immersed in water at all times.
Second question: If the additional thermostat failed in the closed position (never seen a report of this so far, the modern wax type do not fail shut as a rule) the engine would eventually boil. The stat would be easy to extract from the pipe and there should be no problem with fitting a new one. A new hose comes with the plastic fittings complete so you would have to cut the clamp off again.
It is worth noting that our diesels, with 50/50 anti freeze mix and under 15lbs pressure will not boil until 135.6C.

Thanks for that. I knew it was a relatively recent mod, and had never heard of failures except from new. It was more of curiosity. Mine seems to sit around 86, which I am delighted with, but the magic number seemed to be 88. Figured that the extra water a few inches away would have allowed it to warm more before opening, since there is a small additional amount of coolant to heat. Therefore the coolant near the temp sensor would have slightly more time of heating up before the stat opened.

[clf]

Originally Posted by pletevl

OK, so I will be doing this, what difference will I notice after ?
my car sits around 76 degrees at the moment

Are well as seeing the temp rise as said, you should see an improvement in mpg. In my case 10mpg improvement over my normal daily commute.

[jonathan63]

Originally Posted by clf

Are well as seeing the temp rise as said, you should see an improvement in mpg. In my case 10mpg improvement over my normal daily commute.

The inside of the car will be a lot warmer, at lot quicker as well. Toasty even!