Thread: Bloody coolant tank cap...

Bastard thing is still doing it.
But it's not spewing coolant like it was previously, more the occasional dribble as the pressure escapes through the stuffed tank cap.
Time to stop beating around the bush and get a new one methinks.

Anyone have any ideas for stopping it while I sort out a new one?
Is it possible to simply replace the O-Rings.
It hasn't lost much, maybe 3/4s of a cup over 60kms, being pushed out through the overflow pipe. I undid the cap to allow the pressure to escape so it's not pushing it out while I'm at uni.

just keep topping it up and keep a very close eye on it. not like the temps up your way are going to make it boil quickly.

No low water alarm huh? Bad Muppet! (HeHe I knew you did not have 1, Was just making you feel bad )

Sounds like the first stages of a dowell /head gasket issue to me.

Don't say that
I don't think it is, never overheats, coolant level always steady (when I do the cap up properly) , no white smoke, no milky oil, none of the head gasket symptoms.
I did it up REALLY tight on the way home and it's not moved.
When you have a look at the cap, the interior section is worn and the O-rings aren't in good nick.
So I'm not overly concerned, anyway, if it is then it's a good opportunity for me to expand my mechanical knowledge
Always look on the brightside and all that

Hi there the seals do get flattened causing some bypass new cap is best option as it is fitted with a valve that may also be on way out.

Here's the sizes of Viton seals
Upper ID 24mm 3mm thick
Lower ID 22m 3mm thick

They are nice and small and easy to keep as a spare part in car

Pete

Originally Posted by ScotsD2

Hi there the seals do get flattened causing some bypass new cap is best option as it is fitted with a valve that may also be on way out.

Here's the sizes of Viton seals
Upper ID 24mm 3mm thick
Lower ID 22m 3mm thick

They are nice and small and easy to keep as a spare part in car

Pete

Cheers mate, the one O-Ring is missing and the other is flatter than the Hay Plains
No wonder it's leaking.