Coolant leak from rear of cylinder head.

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Benny_Boy

Active Member
Posts
101
Location
Bristol
My 300tdi seems to have sprung a coolant leek at the back of the engine, on the cylinder head block. Looks like the core plug as failed. See image below



What's the best way to tackle this? Engine out or take the head off?
 
Last edited:
25 CMS?
Could do that in situ I would have thought.
Have you done one before?

Nope. Never. Only just found out what those recesses were after that little fountain appeared.

From what I've read the technique is:
  1. Drain coolant.
  2. Stab a screwdriver through the middle and prise the cap out.
  3. Clean up mating face in the block with emery.
  4. Hylomar the mating faces
  5. Insert new plug using (ideally) a socket the same diameter as the plug's OD and tap gently home.
Sounds ok? Any tips or other instructions?
 
Nope. Never. Only just found out what those recesses were after that little fountain appeared.

From what I've read the technique is:
  1. Drain coolant.
  2. Stab a screwdriver through the middle and prise the cap out.
  3. Clean up mating face in the block with emery.
  4. Hylomar the mating faces
  5. Insert new plug using (ideally) a socket the same diameter as the plug's OD and tap gently home.
Sounds ok? Any tips or other instructions?
Nope, that's it.
 
As said 25cm clearance I would do that in situ, I have an old shaping chisel that I drive into the side of the core plug then use it as a lever to pop the plug out, some people use self tappers then lever the plug out, others drive them inwards then turn them sideways to extract them.
Bet there are some vids on youtube?
 
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