I own a 1989 LR 90 TD originally with a 19J engine which I replaced with a 200 TDI 10 months ago. I was lucky enough to find this 200tdi in superb condition (I estimate no more than 35,000 Km) which came off a Discovery. I can't begin to describe how perfect it runs and my satisfaction except that I have a mystery coolant loss of significant qty ~ 4 liter(1gallon) every 10 days!
Repeatedly Inspected everything; no sign of wetness or green coolant coloring.
Checked the plugs, ok.
Pressure tested system; no sign or pressure loss.
Observed exhaust gasses in various conditions (first morning,heavy load etc); no white smoke.
No sign of milky residue on oil filler cap.
No sign of coolant in the oil.
No bubbles in coolant expansion tank and no pressure at all. Even after long drive.
Operation temp very low. 85-87 deg Celsius even after a long drive.
Thermostat 85 deg C. Takes about 30 min to open on standstill running.
Inspected rad for clogging; not clogged. Counter-Verified temps with laser thermometer.
Not even the slightest disruption, noise, studdering, anything other than perfect during engine operation under any condition.
Please help! I am going crazy with this.
Someone suggested that there may be a crack on the head behind the hot plug allowing coolant in the exhaust cycle without affecting the compression cycle. Anyone heard anything of the sort for a200 tdi? Any comments?