Mechanics

COOLANT IN INTAKE

1982 Jaguar XJ6

Engine Cooling problem
1982 Jaguar XJ6 6 cyl Two Wheel Drive Automatic 130000 miles

I was recruited by my brother-in-law to get his Jag running. While in the process of changing old and hardened fuel lines, I noticed coolant in the intake manifold. I took off the throttle body and swabbed out about a quart of antifreeze. The car was purchased from a family friend a few months ago, and the vehicle hasn't run for several years. Are there known issues with coolant in the intake manifold. I pulled the spark plugs and see no visible signs of antifreeze in the cylinders, and the carbon deposits (atop the pistons) for all cylinders are still intact. I am used to seeing antifreeze causing carbon removal from pistons. Before I get too involved, I would like to know how much work is ahead of me. I am a mechanic by trade, but have little time to waste on this vehicle.
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RAVJR66
February 22, 2009.




Hi Ravjr66, first off whats a few years, that the car sat up? Was it started on occasion or just sat for years? My guest would be the Intake Manifold gasket could be dry rotted, Have you done a compression check on the motor? How much coolant are you loosing. The work involve is not like rebuilding the motor. Get back to me.

Tiny
Bentley Eversley
Mar 1, 2009.
Bentley,

The car sat for several years without being started. It was parked in the garage after coming home from an oil change and finding a puddle underneath the car. The previous owner thought it was engine oil. The engine oil level seems to be okay, although the cold start injector is spraying fuel out of the injector body. I presume that this caused the puddle, and the owner didn't take the time to check what the fluid was (on the garage floor).

This weekend, I pulled the intake manifold and coolant manifold to see how it could be possible for that much coolant to find its way into the intake plenum. It would seem that either sealing between the intake and the cylinder head would be an issue or a hairline crack between the a coolant passages and an intake runner. I was going to call our local machine shop and see if they would hot tank the intake, then check it with dye penetrant for cracks. If nothing turns up, I will assume that the problem was with the intake gasket. I looked at the engine design relating to cylinder head position and intake manifold position and feel that I can rule out a head gasket problem. The coolant would have to run uphill before getting into the intake manifold. I guess there is always the chance, but I am ruling it out for now.
The intake studs had some dissimilar metal corrosion built up in the intake bolt bosses which may have pushed the intake away from the gasket. Just an idea.
Thanks for the help. Rocco
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Tiny
RAVJR66
Mar 2, 2009.

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