I need to replace this part and have no idea what it's called.
Not knowing what it is is really hard to do research on.
Please advise.
1985 XJ6

Thanks

 

Breather cap. Part number C44386

Cheers
DD

 

SNAP! Your the best! Thanks Doug

 

While you have that off, you might as well get out the ratchet set and take off the filter and manifold that breather cap connects to and clean it. Generally when the cap cracks (which I assume is what happened to yours) the filter is also generally very dirty or even clogged.

 

While you are there you should also adjust the upper timimg chain.