Just finished rebuilding my 1.9 DG WBX 1987 lump after blowing head gaskets on M27.
Anyway, the engine runs, have spent a substantial amount of time bleeding the coolant to notice that the pressure cap is now leaking....

I cant get one from JK as out of stock, so need to surce another...If I keep this topped up is it ok to use or do I run the risk of un-doing all my good work as I want to get the bus MOT'd tomorrow....
And secondly would this have caused the issue with the head gaskets in the first place, dont recall it leaking before.
Cheers.