Diesel inline thermostat mod and increase in MPG

Tourist · 29th October 2016, 22:00

I had time today to fit the inline thermostat to my 2.0 CDTi today, which I bought from Mat at DMGRS. Fitting it was pretty straight forward, even though as I don't have a Dremel, I had to remove the inlet manifold and attack the top hose clip with a hacksaw.

Once fitted, I put everything back together and took the car for a 100 mile drive out to Wisbech and back to see the inlaws. Amazingly after my previous personal best at Grandad driving (50.4 MPG) I managed an overall 55.4 MPG.

The engine is now running between 84 and 89 degrees (as opposed to between 60 and 64) and finally my heater blows warm.

I couldn't be happier with the results of such a simple modification.

Two things I did notice:

1. the inlets and EGR valve are covered with about 4mm of oily crud - is that OK / normal? Should I clean the EGR valve?

2. A narrow bore pipe leads from the front of the EGR to what I guess is whatever activates valve - the bracket that holds that gizmo has broken and it's flapping around under the ait intake duct. I guess I need to do something about that fairly quickly. I was thinking of cabletying it out of the way...

Cheers...

Simon.

29th October 2016, 22:00	#1
Tourist Loves to post 2004 Rover 75 Tourer CDTi Join Date: Apr 2016 Location: Fulbourn, Cambridge Posts: 455 Thanks: 105 Thanked 123 Times in 101 Posts	Diesel inline thermostat mod and increase in MPG I had time today to fit the inline thermostat to my 2.0 CDTi today, which I bought from Mat at DMGRS. Fitting it was pretty straight forward, even though as I don't have a Dremel, I had to remove the inlet manifold and attack the top hose clip with a hacksaw. Once fitted, I put everything back together and took the car for a 100 mile drive out to Wisbech and back to see the inlaws. Amazingly after my previous personal best at Grandad driving (50.4 MPG) I managed an overall 55.4 MPG. The engine is now running between 84 and 89 degrees (as opposed to between 60 and 64) and finally my heater blows warm. I couldn't be happier with the results of such a simple modification. Two things I did notice: 1. the inlets and EGR valve are covered with about 4mm of oily crud - is that OK / normal? Should I clean the EGR valve? 2. A narrow bore pipe leads from the front of the EGR to what I guess is whatever activates valve - the bracket that holds that gizmo has broken and it's flapping around under the ait intake duct. I guess I need to do something about that fairly quickly. I was thinking of cabletying it out of the way... Cheers... Simon.