300Tdi aftermarket t/stat warning....

Quote:

---

Originally Posted by uninformed

[snip]
It is part number TT265-180, the lower/bottom ring is a touch smaller in OD than the 2 OEM I have but It still does the job. It has 71c stamped up inside the copper tube.

hope this helps some.

---

Serg, that's the type Tridon list as the t/stat for a 300Tdi.

I was worried that the stroke, as well as the diameter of the bypass valve wouldn't shut the by-pass port.
I'm pretty sure I measured the by-pass port in the head, etc at the time and decided I wouldn't risk it.

OE t/stat dimensions.

By-pass valve below main body at closed point is 39mm
by-pass valve OD is 33mm
Main body OD is 52mm

TT265-180/192/195

BPBMB = 35mm
BPV = 27.7mm OD
MB OD = 54mm

Basically the OE spec t/stat will shut the by-pass port before the TT265 for a given crack temp and there may be a possibility the valve mightn't shut the by-pass port properly due to the smaller OD.

hmmmm.....I think I am running this one in my 2.8???? I could only be sure by pulling it out.

remind me, is it hard to get it out and refit it? do i need a new gasket or sealant?

Quote:

---

Originally Posted by uninformed

hmmmm.....I think I am running this one in my 2.8???? I could only be sure by pulling it out.

remind me, is it hard to get it out and refit it? do i need a new gasket or sealant?

---

They are Oringed Serg, should come with a new one.

JC

Quote:

---

Originally Posted by justinc

They are Oringed Serg, should come with a new one.

JC

---

yeah, the 2 oem ones are, the TT265-180 hasnt got one. But I suspect It could be borrowed from the OEM.

I have only done the T/stat once and forget. Is it just a matter of unbolting the housing and pulling it out? and just pop it back in? no gasket or sealant on housing?

Quote:

---

Originally Posted by uninformed

yeah, the 2 oem ones are, the TT265-180 hasnt got one. But I suspect It could be borrowed from the OEM.

I have only done the T/stat once and forget. Is it just a matter of unbolting the housing and pulling it out? and just pop it back in? no gasket or sealant on housing?

---

Yes, just undo housing, lever it out and refit new one, hole to the top. No sealant etc required.:)

JC

cool, Ill try and dig mine out and see if I can id it....if indeed it is the TT265-180, then it SEEMS to be working ok???

I only use genuine ones, or at least OEM from UK manufacturers.

JC

Quote:

---

Originally Posted by justinc

I only use genuine ones, or at least OEM from UK manufacturers.

JC

---

and I would be happy also, but when I fitted the 2.8 I was unhappy with where the engine was sitting temp wise, and this was during spring, with zero load....

Quote:

---

Originally Posted by rick130

Serg, that's the type Tridon list as the t/stat for a 300Tdi.

I was worried that the stroke, as well as the diameter of the bypass valve wouldn't shut the by-pass port.
I'm pretty sure I measured the by-pass port in the head, etc at the time and decided I wouldn't risk it.

OE t/stat dimensions.

By-pass valve below main body at closed point is 39mm
by-pass valve OD is 33mm
Main body OD is 52mm

TT265-180/192/195

BPBMB = 35mm
BPV = 27.7mm OD
MB OD = 54mm

Basically the OE spec t/stat will shut the by-pass port before the TT265 for a given crack temp and there may be a possibility the valve mightn't shut the by-pass port properly due to the smaller OD.

---

Once again, looks like Rick is the man and im just the special kid sitting in the corner.......hello

I popped open the T/stat housing and pulled my t/stat out. It appears it is NOT the TT265-180. I think it must be the TT388-180. I look up inside it and it has a 82c stamped in it. So not as low as the TT265-180 (71c), but still better than the 88c that the oem are.

Whilst I had it out I compared it physically with my OEM and the TT265-180. The TT265-180 is very close, but like Rick said, it probably wont do the job properly.

One thing I found was that my oring was all fubar'd (Rick, this may be part the reason for that Temp spike I suffered a couple months ago.) So I just pinched one of the OEM and put it back in.

So it looks like the TT388-180 is the Tridon T/stat for the 300tdi, it has a crack temp of 82c.

cheers,
Serg

In trying to sort my overheating woes, the mechanic has fitted a Stant t/stat to my 300tdi. Up till then these things had been done.
radiator rodded. (w/shop reported only20% blocked)
new pump
cylinder leakage test done and ok
pressure test cooling system and ok
new cap (tested and ok)
new t/stat (Stant)
Also, the head gasket was replaced about 18 mths ago.
I've since pulled the Stant out and fitted new another new oem cap and Waxstat t/stat.
Now with a fill from the heater hose and bled through the bleed plugs and tank cap, I can only drive about 15 mins before the needle starts rising. when I stop, there is water being pushed out the pressure cap and on letting out the pressure via the bleed plugs, I find air under both bleed plugs and the expansion tank chokka with water. At this point , it'll take about 2 litres to refill and I can go again.
So, here are the questions. Whats likely to have happened, and what effect would that Stant t/stat have on the engine, given that it's a lot shorter than the oem one, and the spring loaded washer at the end doesn't reach the back of the t/stat housing.
I'm feeling worried.
Don