Thread: Puma 2.4 oil blowby?

More digging online, and to pre-emptively answer my own question (such that anyone in the future may have a similar issue and stumble on this), very much seems like an injector seating issue.

Not sure if allowed here, cross-posting to another forum but the below thread pretty much exactly describes it.

DEFENDER2.NET - View topic - Excess Chuff? (Possible high engine crank case pressure)

And before video (from thread - near enough to exactly same as mine):

DEFENDER2.NET - View topic - Excess Chuff? (Possible high engine crank case pressure)

And after cleaning/seating injectors:

Chuff Update - YouTube

Good thing stuck in lockdown!

Might be worth checking for a crack in the exhaust manifold or a leak caused by a loose bolt.

Originally Posted by DiscoMick

Might be worth checking for a crack in the exhaust manifold or a leak caused by a loose bolt.

Thanks Mick - for my learning how would a crack / leak in the exhaust manifold lead to oil / exhaust spitting out the oil filler?

Or do you mean just the oil spitting out of the hoses?

Catch can could be culprit,bypass it and see how you go.

Engine oil not over full?

If problem still persists,compression test is probably the next thing to do,or take it to your local indie,and see what they say.

Originally Posted by scarry

Catch can could be culprit,bypass it and see how you go.

Engine oil not over full?

If problem still persists,compression test is probably the next thing to do,or take it to your local indie,and see what they say.

Thanks for your input Scarry. Hadn't considered the possibility the issue could be the catch can! I'll have to check... Gut feel is its okay as it is filling (too) well still so if it was blocked up and restricting the rocker case pressure it probably wouldnt be getting much oil into it.

Oils good - measured it last change (5k km ago) and dipstick is about half / two thirds up the hatched part.

I'm thinking its these injector seats but if not that will be the way I go! The two inner injector seals in the rocker case have had quite a bit of oil seepage / plenty of gunk built up, especially second to front, so expecting it'll be that one/combo of that and the other. Plan to pull the injectors and have a peek down the barrel this weekend. I'll report back with pics for future ref

Originally Posted by carpdvl

Thanks Mick - for my learning how would a crack / leak in the exhaust manifold lead to oil / exhaust spitting out the oil filler?

Or do you mean just the oil spitting out of the hoses?

The exhaust manifold on ours cracked and had to be replaced. Was letting dirty oily air out. I was told Ford redesigned it with ribs to make it stronger. But that's only a guess in your case. Good luck with it.

As already mentioned, the injector seals allowing blow by is reasonably common.\
When doing the injector seals replace the big rubber looking seals for the plastic cam cover otherwise they will continue to leak mess to the outside.

Originally Posted by DazzaTD5

As already mentioned, the injector seals allowing blow by is reasonably common.\
When doing the injector seals replace the big rubber looking seals for the plastic cam cover otherwise they will continue to leak mess to the outside.

Cheers - have the parts en route now including the rocker cover seal, little rubber seals for the injector breathers, copper washers and new stretch bolts.

Out of interest does anyone have any tips for keeping debris from falling into the cylinders when cleaning? I bought an injector seat cutter and at the moment seems to me best bet may be to just dip that in heavy grease to catch the carbon crud it cuts?