The Elusive airlock - MG-Rover.org Forums
 
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post #1 of 7 (permalink) Old 11-04-2014, 21:06 Thread Starter
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The Elusive airlock

For a few months now I have been trying to hunt an airlock in the system causing coolant boiling.

Tonight I finally took the plunge to strip the inlet manifold off and came to an amazing discovery. The jiggle valve was completely clogged up with copper. It seems that a previous owner had some fun with rad weld and it has finally caught up with me.



Hopefully if I can get it back together tomorrow in time for the Arundel meet up on Sunday. I'd like to think I may have reached the end of the problem.
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post #2 of 7 (permalink) Old 11-04-2014, 22:02
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Well found!
That could certainly cause an airlock.

As you have found this it would be a good idea to check the other jiggle valve (on the top of a hose at the rear of the engine - just follow the thin pipe back from the coolant bottle).
It is not as prone to blocking but considering the state of the one you have found it would be worth the extra hour.
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post #3 of 7 (permalink) Old 12-04-2014, 20:17
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I'm fighting against an overheating issue currently - the inlet manifold jiggle valve is the last part I did not check properly...

Two questions:

- I noticed the hose coming from the inlet manifold jiggle valve to the expansion tank is cooler than the hose coming from the other jiggle valve.
Also the flow in the expansion tank gets a little weaker when pressing the hose from the inlet manifold but stops completely when pressing the hose coming from the other jiggle valve.
Does this indicate a blocked valve in the inlet manifold??

- How to reach the lower bolts that hold the inlet manifold to the engine?
I have the bigger metal manifold fitted, not the black plastic one. Tried to remove it today but failed to reach the lower bolts.
Any ideas or workaround??
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post #4 of 7 (permalink) Old 12-04-2014, 20:24
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Yes, if the flow stops as described then thatis probably a blocked jiggle valve in the inlet manifold - I had the same problem.

As to undoing the bolts ...
I had trouble getting to the lower bolts on a plastic maifold let alone a larger metal one.
Others may have suggestions.

Good luck.
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post #5 of 7 (permalink) Old 13-04-2014, 05:42 Thread Starter
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Quote:
Originally Posted by g0rsq View Post
Spare set of knuckles for when you bruse and cut yours
I found his out the hard way.
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post #6 of 7 (permalink) Old 13-04-2014, 11:41
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i found if i removed the exspantion tank and dipstick casing the bolts are easy to remove still a bit tight but not hard if you get any of the studs coming out replace them before you try to refit the manifold or you just have no idea how much thread goes back into the head
Ron
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post #7 of 7 (permalink) Old 13-04-2014, 18:28
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did it.
No fun but not as hard as I expected.

Jiggle valve was a little dirty, not sure if it was blocked completely.
At least it's clean now; I really hope my overheating issue is sorted now.
I've no idea what else to check if it returns...
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