Help with these breakdown symptoms: Thermostat? - MG-Rover.org Forums
 
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post #1 of 7 (permalink) Old 20-04-2017, 17:04 Thread Starter
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Help with these breakdown symptoms: Thermostat?

Hi,

I was driving for about 15 miles from cold on motorway and the system started to pressurize and spit emulsified coolant, but the temperature did not rise and I stopped to let it cool off. There was no heat from the heater yet almost no coolant was lost - could this be a thermostat that failed to open?

Then I continued on another five miles, at my destination I wired up fan to run all the time.

I then drove 20 mile home on motorway, stopping occassionally to confirm not boiling over.

However, at mile 18 the exhaust turned blue from burning oil, and I pulled over and turned engine off.
Engine kept dieseling on it lubricant and stopped after 20 seconds. Smoke out dipstick.

Since then does not start - sound of no compression (possibly oil on rings burned dry).

Is there any hope or is engine likely finished? Did a stuck thermostat cause this?
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post #2 of 7 (permalink) Old 20-04-2017, 17:20
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Head gasket?
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post #3 of 7 (permalink) Old 20-04-2017, 17:26 Thread Starter
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Quote:
Originally Posted by Fast Guy View Post
Head gasket?
Yes but initially no high temperature, no steam, yet no heat in heater core.
So does this indicate initial cause is stuck Thermostat?
Is a 2005 1.4 K with the Pressure Temperature Thermostat doacky thingummebob.

Also, is oil smoking in crankcase an indication of no hope?
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post #4 of 7 (permalink) Old 20-04-2017, 19:57
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Emulsified oil in the coolant can really only indicate one thing - HGF (or residual emulsion left from a previous HGF where the system hadn't been sufficiently flushed.

Lack of heat from the cabin heater is not unusual where there is loss of coolant (for whatever reason). It is the highest part of the system, so is the first part to lose coolant and fill with air. Emulsified oil in the coolant system can also cause blockages, and again, will tend to rise to the higher parts and can easily block flow through the heater matrix.
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post #5 of 7 (permalink) Old 20-04-2017, 21:14 Thread Starter
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Thanks.

Is it possible to have zero compression with HGF but with a head that is not warped?

I went to do compression test and found that all four plugs had come lose.
#1 WOT returned 30 psi, other cylinders zero.
Added oil to each cylinder, #1 increased to 90 psi, rest still zero.

The oil is not emulsified and no mayo on oil cap. There is still enough oil in the crankcase to just touch the min mark, and the coolant level was above max when cold (suspect it has 0.7 liters of oil in coolant).

Does this sound like it has to be a warped head, or can HGF alone lead to zero compression?
Anyone every had smoke in crankcase but engine bottom end survived?
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post #6 of 7 (permalink) Old 20-04-2017, 23:25 Thread Starter
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Drained it down and found the only water in it was what was in the expansion bottle and about a cupfull in bottom of rad.

It deceived me into thinking it had coolant in it when it didn't, I think.

Also found oil in the throttle body.
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post #7 of 7 (permalink) Old 21-04-2017, 19:56
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Sounds to me like it could be terminal...
If I was in your position I would strip the head off and look inside. It should be apparent if it's salvageable or not. The initial fault could have been a number of things, but it is unusual for the coolant not to drain from the header tank, it's like you have a blocked pipe stopping the circulation.
Keep us posted and good luck.
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