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post #1 of 68 (permalink) Old 6th April 2008 Thread Starter
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Scenic I: mid-HG replacement photos

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 oil 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 :-)
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post #2 of 68 (permalink) Old 6th April 2008
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Great post. Keep it coming mate. A post like this should help quite a lot of people through this problem and save them some money too.
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post #3 of 68 (permalink) Old 6th April 2008 Thread Starter
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Cheers, Mike.

I hope no-one's expecting this to be an illustrated 'how to'. I've no idea what I should be doing next (apart from going to the supermarket, of course)...

Perhaps someone could change the thread title to something like 'WHAT THE DO I DO NOW?'
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Last edited by mojolicious; 6th April 2008 at 01:00 PM.
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post #4 of 68 (permalink) Old 6th April 2008
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Very helpful post indeed Mojolicious - excellent pics as well.
Looking at the the pic of the cylinder head No1 is about the only one that is showing the correct colour - so power was down on 3 cylinders. Judging from the crusty deposits you would be tempted to think someone has run the engine without corrosion inhibitor - a sign of cheap or very little or no anti-freeze. Have you any plans to replace the water pump at this stage
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post #5 of 68 (permalink) Old 6th April 2008
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There are 2 temp sensors on that Housing. 1 purely operates the instrument panel temperature gauge, the other is for the engine management and the correct running of the vehicle.

Eh what you talking about? No 1 Cylinder is showing that it has been washed out by the coolant leaking into the cylinder.. The other 3 cylinders all look perfectly fine with the usual sooty deposits around the valve seats as you would expect.

There hasn't been any Antifreeze in that engine for a LONG time..!
Moral of this story: Its all very well for a mechanic at service time to look at the bottle and mark on the service sheet that the coolant is OK. I would say that the anti-freeze strength has never been properly tested. If it had been then you would have been advised that it needed replaced.

Jeez this is exactly how garages get a bad name by shoddy short cut servicing or lazy Mechanics!!

EX Renault Dealer Technician & MOT Tester, Not a Monkey!
For as long as but one hundred of us remain alive, we will never on any condition submit to the domination of the English.....It is not for glory, nor riches, nor honours that we fight, but for freedom alone, which no good man gives up except with his life. Arbroath 1320
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Last edited by WebCode; 6th April 2008 at 03:04 PM.
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midhg , photos , replacement , scenic

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