Vehicle & Technical > Discovery

Cracked head? K seal?

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marky:
I noticed that my 300tdi was over the red on the temp guage when I got home from a short trip on saturday evening. Completely forgot on sunday until I made another short trip on sunday and it happened again! The expansion tank only had about 1" in the bottom so I topped it up and trawled through the forums to see what info I could find. Yesterday I flushed the radiator and tested the t/stat and took it out for about 4 miles and again it was in the red, I left it in the drive and got back on the computor! Out of nescesity I took it to work today (another 4 miles and back) and again there is only about 1" in the expansion tank. There are no obvious water leaks so I was expecting the head gasket to have gone, although the oil seems fine. A friend of a friend has just been to have a look and all he did was put his hand over the tank opening while the engine was running and confidently told me that the head is cracked and it can be fixed with a shot of K-seal!!!!! What do all you knowledgable chaps think of this?

peasey:
hi mate,i have used k seal but only to sort out my thumb size hole in my rad on my mrs sharan and i must admit i thought it was pretty good but it was in a rad not a head.I know that it says on the bottle that it seals cracks in cylinder heads and gaskets but to be honest im doubtfull,i could well be wrong about it but the diesel compresion is pretty high and i would worry about it just opening up any cracks again.Another thing is(im sure someone can tell you if im wrong)how can your mate be sure that its the head by placing his hand over the expansion tank,he must be felling a pressure build up i know but gaskets can go and not leave any visable trace,i had this on my 110,no mayonaise in the oil at all.If i were you i would remove the head and investigate properly as you need the motor to be reliable better safe than sorry mate.hope this helps(fingers crossed)

marky:
Its not that i doubt this mans skills as hes quite a wizard with motors ( and would of earned a few quid sorting mine as i've never ventuered inside an engine!) its just that it goes against most of the things ive read over the last few days where people are replacing heads/ rebuilding engines etc to sort this sort of problems. This is my first LR and i'm really enjoying it but i'm now finding out that using a 4x4 for fun is quite an expensive hobby (new turbo, several shocks and several other things yet to be fixed). The K-seal solution would really suit my budget right now!

marky:
Could I use K-seal to find out first, would it do any harm? Isn't it supposed to fix gaskets too? How much for a test and where? Henry where did you get your k-seal, do AT Johnsons sell it?

Les Henson:
Ceramic motor seal is more likely to fix it - that's what it's designed for. I used it on a 4.6 V8 with success.


Les.

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