Head gasket failure
23-04-2007, 09:39 PM
#1
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Head gasket failure
Got a weird one here on my MGF... I know its a K-series etc etc etc etc etc but read on.....
It over heats but only after you give it good rev (say 5 mins at 3k off load) BUT and its an odd one - it takes 5 mins before the header tank bubbles and the temp gauge starts to rise.
With the filler cap on this has lead to me turning the engine off before it overheats completely.
But with the cap off it bubble like made for 30 secs then calms down. The temp gauge goes about 3/4 up then drops down and given about 10 mins the fan cuts out and everything is back to normal.
There is no water in oil, oil in water, misfires or rough running. I have just replaced the Rad and thermostat.
Any ideas?
Alex
It over heats but only after you give it good rev (say 5 mins at 3k off load) BUT and its an odd one - it takes 5 mins before the header tank bubbles and the temp gauge starts to rise.
With the filler cap on this has lead to me turning the engine off before it overheats completely.
But with the cap off it bubble like made for 30 secs then calms down. The temp gauge goes about 3/4 up then drops down and given about 10 mins the fan cuts out and everything is back to normal.
There is no water in oil, oil in water, misfires or rough running. I have just replaced the Rad and thermostat.
Any ideas?
Alex
23-04-2007, 10:13 PM
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sounds like a cracked block or head gasket has blown across a water way to comprison I think they are fitted with a metal head gasket as standard and they only seal on the silicone bead and that normally fails and causes what you have .take the head off really
24-04-2007, 07:22 AM
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I'd go with a possible air lock first before presuming the worst!!!
I had a right bitch of a job getting all the air out of the system in a Metro after I'd done the headgasket!!!! Try getting a LARGE funnel & putting that in the header tank & filling that with coolant to give it a bigger head of water - I found this helped alot. I also heard that sometimes drilling a couple of holes in the stat helps also!!!
I had a right bitch of a job getting all the air out of the system in a Metro after I'd done the headgasket!!!! Try getting a LARGE funnel & putting that in the header tank & filling that with coolant to give it a bigger head of water - I found this helped alot. I also heard that sometimes drilling a couple of holes in the stat helps also!!!
24-04-2007, 07:42 AM
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MGF & TF's need to be pressure bled Alex, i had the same problem with the birds TF....
This site is one to ask questions on mate - www.mg-rover.org - i use it when a problem rears its ugly head!
This site is one to ask questions on mate - www.mg-rover.org - i use it when a problem rears its ugly head!
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24-04-2007, 08:52 AM
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God knows how mate, but i was told to have it pressure bled when changing the anti freeze - spoke to my nephew (as i had never heard of this) he had all the kit at work so did it while the missus waited..........
I'll give him a bell later & see how its done!
I'll give him a bell later & see how its done!
24-04-2007, 08:56 AM
#10
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Originally Posted by abdr500
sounds like a cracked block or head gasket has blown across a water way to comprison I think they are fitted with a metal head gasket as standard and they only seal on the silicone bead and that normally fails and causes what you have .take the head off really
Alex
24-04-2007, 09:07 AM
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HG Paranoia is worse than cossie paranoia Alex! 
Doesnt sound like a HG failure to me (or so i have read! and trust me when the missus said she wanted a TF i did loads of research!
)....
Doesnt sound like a HG failure to me (or so i have read! and trust me when the missus said she wanted a TF i did loads of research!
)....
24-04-2007, 09:31 AM
#13
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LOL I wouldn't be worried but I'm not the main driver of this car Tony....
Franko, you dead right there - driving to work today I swore I could hear boiling water
Franko, you dead right there - driving to work today I swore I could hear boiling water
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