0

I have a radiator that has started leaking oil, by its bolt.

I assume that cause can be that metal is a bit rusty around the bolt, as it is easy to remove the paint when scratching and a bit of rust is below.

Facts: from the factory it had a transparent silicon but it is not stopping the leak anymore. The bolt seem very tight

Should i remove the silicon, remove rust and apply a sealant? Untight the bolt, remove rust, apply a sealant and tight the bolt again?

1 Answer 1

2

Usually a bolt/fitting that should seal from liquid(oil,water) will either have a sealing washer and/or sealing/plumbing tape/paste on the threads.

Would remove the bolt, clean surface and threads, apply tape/paste, and replace the bolt. Might want to turn the radiator so bolt/hole is pointing up.

Check the hole/surface for cracks. Using a sealant(silicone) on the outside to seal usually will cause leaks, not a good practice.

3
  • 1
    Yeah, some sort of sealant on the outside sounds like the last person applied a band-aid, and the adhesive has finally worn off. Do a proper fix this time.
    – FreeMan
    Mar 15, 2022 at 13:49
  • is there any risk about removing the bolt? i mean that maybe it is not designed to be removed Mar 15, 2022 at 14:36
  • Bolts are usually designed to be removed. The only risk is that it is a drain bolt, so once removed the oil will want to drain out. Why I suggested to turn the radiator up. If bolt is near or at the bottom, then most likely it is a drain bolt/stopper. If near the top, probably a filler bolt.
    – crip659
    Mar 15, 2022 at 15:13

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.