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1984 XJ6, sludge(oil)in the water

Larry M. Orr
Jaguar Club of Houston *

forum user since 2011-11-01

 



Could oil in the water be coming from the cooler/heater tube at the bottom of the radiator. There is no water in the oil, but the water level drops a little every day, and there is sludge in the recovery tank. There are also no leaks of coolant anywhere I can find. HELP!

Current Jaguar: 1984 Series III 4.2, Black exterior w/Bisquit leather

Previous:1985 XJ6

1984 XJ6, sludge(oil)in the water

Scot Weaver
Carolina Jaguar Club *

forum user since 2009-03-25

 

A bad oil cooler will put oil in the water , but hardly any water may get in the oil. The oil side of a cooler is high pressure , and water side low pressure, thus the transfer. The problem is , your loosing coolant , and you can't see a leak. A bad head gasket can put sludge in the cooling system , and you will loose coolant, (out of the exhaust ) while you are running . But you would normally see higher coolant temps. also. I would pressure test the cooling system , if the pressure drops over time , pull your plugs and see if there is any coolant on any of the pistons. if so the head gasket is bad.... the cooler can of course be pressure tested also..........cheers

1986 XJ6, Kitty Hawk N.C.
2006 Triumph Bonneville

1984 XJ6, sludge(oil)in the water

Larry M. Orr
Jaguar Club of Houston *

forum user since 2011-11-01

 

Thanks a million Scot. That pretty much answers my suspitions. Incidentally, I'm a tar heel myself, born in Charlotte, raised in Asheville, Raleigh, Rockingham, then as an adult in Raleigh and Wilmington. All my relatives are there.
The coast is my favorite place to be.
Thanks again for the info.


Current Jaguar: 1984 Series III 4.2, Black exterior w/Bisquit leather

Previous:1985 XJ6


1984 Jaguar XJ6
1984 XJ6, sludge(oil)in the water

William Brady
Jaguar Owners Club, Inc. *

forum user since 2004-02-15

 

Check the spark plugs see if any are rusty brown. Unfortunately, when a hot engine is turned off the coolant pressure rises and the oil pressure drops!

Jaguar affectionado and etc.

1984 XJ6, sludge(oil)in the water

Matthew Mariani
Delaware Valley Jaguar Club *

forum user since 2012-03-25

 

Very nice XJ Larry, if your Jag runs well and there are no signs of burning coolant out back, I would suspect the radiator having corrosion through between the coolant side and oil cooler.
I do think coolant Will get into the oil as it is heavier than oil and there is sufficient pressure to do so when parked and hot. You may simply not be seeing foam under the filler cap yet.
If you haven't already, STOP driving the car. If you are a decent mechanic, do a compression test, look at all spark plugs as others recommend, take off a valve cover and look for foamy signs of coolant in the oil... If everything checks out remove the radiator and have it tested. Maybe you will get lucky and simply have to replace the radiator.
I wish you the best of luck determining this issue,
Regards, Matt

1972 XJ-6 High Compression 4.2L