1998 1.6e 8v KVM/702
Pottering up the Old Kent Road yesterday three things simultaneously happened:
a. idle dropped to 5-600rpm - not far off stall speed
b. became aware of a put-putting from the rear exhaust
c. rocking/vibration at idle coming through wheel, gearbox, CAR in general
Pottered about a bit more, picked kids up from school, was nearly home when I noticed the water temperature warning light was on. Got home to find the first signs of mayo, and a very dry expansion tank. So the strip-down began...
The upper thing with the brown sleeve is the water temp sensor - could be a bit too furry to be accurate! - but have no idea what the lower thing with the yellow sleeve is. For info, the old thermo operated when boiled by I had no way of testing the actual temperature.
The recess on the block is much cleaner, pretty much the same as the thermo housing - the stuff can be brushed off very easily. Doesn't appear to be anything wrong with the old pump, though...
#4 is on the left; the exhaust valves appear to run the whole gamut of possible conditions, reminds me of the Haynes sparkplug illustration. This pic shows a few blocked water channels, but not as many as were closed at gasket/block level.
#4 on left; all blocked water channels have been poked through. The scratches on #1 and #4 were from removing the head (guess we should have set the crank to an intermediate position first). As you can see, the water's done wonders for #1. Sleeves appear absolutely fine, though. No scoring at all.
That's the weak bit between #1 fire ring and a water channel. As you can see, the water channels were a little tired :-)
There's no obvious route between
and water (assuming that any water entering the chamber is instantly steamed). Gasket is brittle and has cracked in a couple of places since removal, so I'm not sure it has any more to tell us.
I don't believe I've had to add coolant to the car in my three years of ownership (prior to a fortnight ago, obviously). At every service the anti-freeze levels have been reported as good. My suspicion is that all this is down to the coolant being drained and replaced with cheapo stuff without anti-corrosion properties at some point before I bought it.
Have lots of 'what the hell do I do now' questions which I'll post later - the supermarket calls - but feel free to pre-empt those questions while I'm gone :-)