Lijkt sterk op het probleem wat ik had. (zie topic ong. 2 maand geleden over hoge temperatuur van sabine)
Heb toen nieuw radiator gestoken wegens verstopping van de oude.
De vorige eigenaar had er ook zo'n lekdichtmiddel in gegoten en dat is misschien geen goed idee voor de "jiggle valve".
volgende tekst vond ik in duitse forum:
"The MGF has a difficult procedure which must be followed. There are three bleed screws which must be opened until coolant flows freely with no bubbles. Most importantly the filling and bleeding should take place with the heater set to fully hot.
At last it is vital to check the auto bleed valve wether it sticks. See the description far below.
Further the vehicle should be driven for a short while to release any trapped air and re-bled.
© Robert Bell / The three of four bleed locations (three screws A, B, C)
NOTICE: THIS BLEED ACCESS (D) IS CURRENTLY NOT WRITTEN TO THE WORKSHOP MANUAL (EDITION 7) BUT SHOULD BE INCLUDED IN LATER EDITIONS !!
Auto bleed valve (jiggle valve) blocked ?
4th bleed location.
http://www.mgfcar.de/bleed/3817engine_left_l_1.jpg
The red box shows the location where the thin short hose from the expansion tank was clamped with a jubilee clamp.
This is situated in the inlet manifold coolant stub pipe - manifold to expansion tank on the right side behind the oil dipstick assy) . The idea is that the valve will be open to the passage of air but that water will lift the valve and close it. Blockage of this will not only hinder bleeding following previous coolant drain down, but also allow air pocket build up during future use. This may be from small pockets of air or bubbles clinging to the coolant jacket surfaces that will migrate during running. There may also be slight combustion gas leak (having passed the head gasket fire ring). The bleed valve is not available as a separate item, but is a simple device similar to the "Jiggle" valve often seen in thermostats. The only way to ensure that it is clear is to remove the manifold and flush through the stub pipe. At the same time ensure that the short hose from here to the expansion tank is also not blocked or kinked.
(Terry Cox, at the MG Cars BBS HGF Causes)"
Je waterverlies kan ook een minder dure oorzaak hebben dan een HGF :een klein gaatje in de radiator valt meestal niet op omdat het water verdampt door de warmte van de radiator. Bij koude motor is er minder druk in radiator is zodat het dan niet lekt: je ziet dus niet dat er een (klein) probleem is.
Je moet er voorts ook absoluut zeker van zijn dat er geen puur water in het koelsysteem zit want dat geeft ook problemen gezien het lagere kookpunt!
Gebruik enkel koelvloeistof volgens het boekje!
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