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Hi Guys i recently got back into a RR, I picked a very tidy 93 with coil spring conversion. The car had been running great but yesterday on its first trip up Greenmount hill (a big mofo hill here in WA) the bloody thing over heated. So i turned it around and headed home.
There is a slight amount of milkyness in the oil residue on the eng oil filler cap so it looks likes the plugs will be coming out to see with cylinder has coolant in it. and then it will be off with the heads.....
What concerns me is that my 86 had a 92 disco motor in it and that showed the same symptons so the heads and gaskets where replace but it continued to leak coolant. It turned out after much rooting around that #7 cylinder liner was leaking between the block and liner...
Is this a common problem with the 3.9ltr V8's around 92/93?
Its not as common as it is on the bigger boars. 4.0 and 4.6
I wouldnt say its a common thing but known to happen. Sounds like your just unlucky. Its thought bad engine oil, lack off or wrong oil are the main contributing factors to it as the cylenders cause friction and dislodge the liners. Weather its true or not I duno but it sounds feasable enough.
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Had a long hard look at the car and found several Minor faults that all lead to the near meltdow yesterday. The radiator has several pin hole leaks on the front cores. Thats where coolant had been going. The spray is so fine that its being blown away before pooling anywhere you could see it. The misfire has been caused by a very worn and slightly corroded dizzy cap. The car still has the Rists lead on it so i think it well overdue for a set of leads. We pulled the plugs and found all cylinders to be a browny grey colour bar cylinder #5 which is black and half fouled. Cylinder #5's terminal in the dizzy cap had aprox 3mm of white corosion built up on it so that was the cause of the miss firing and rich running at idle. The exhaust has a 4" split on the pipe between the 1st muffler and the resonator hence the "chuffy" sound at idle that i was praying wasnt a burnt ring land or blown head gasket.
The minor coolant residue appears to be minor condensation from the eng oil cooler. I believe there has been a minor leak in the cooler when hot and the milky residue in the rocker cover is the result. The eng oil is spotless so it looks like the small amount of coolant that been entering the eng oil has been boiling off and condesing up top in the motor.
Luckily for me i have a new set of leads, dizzy cap, rotor button.2 1/2" exhaust with hm headers and a recored radiator in my spare parts stash so thats all going in tommorow and the eng's getting a flush an new oil, filter and coolant.
