Urgent Help,what Are They And Why Are They There?

[oldie]

Hey guys,

My problem isnt specifically KE but didnt know where else to ask,hope someone can help. We are fitting a set of extractors to a 2T engine and they will not go back to the head because there are these strange plugs that come out of the head at about 45 degree under each exhaust port and they are interfering with the extractor flange.

The one directly under the front port has a small plug in it and is screwed flush with the head,the othe 3 are like a piece of holloe section pipe but threaded inside and out,they extend approx. 10 to 15 mm beyond the face of the head,at 45 degree,it is these 3 that are interfering with the extractors.

We removed one to have a look and the was a small bolt reverse fitted into the hole,not screwed in but just sitting there so that when the plug was screwed in it would be jammed up tight against some internal part of the head,blocking the pathway.When these plugs are out there is a passage through into the exhaust port. Am I correct in assuming that these were for some sort of access to drill the head or something.

Anyway,if these remain we cannot fit the extractors without grinding the flanges,don't want to do this so they need to go and be changed to like the front one.Has anyone got any advice,can tell me their purpose or can they supply plugs for the other holes,I would need 3.

Thanks,Pete

Edited June 23, 2013 by oldie

[parrot]

I am almost certain they are a port for air injection of some sort related to emissions. You just need to block them off. As you said, you need to get three more of the flush plugs.

[springersrolla]

I had the same drama fitting extractors to my 3t, it is an emissions setup, it runs a branch of 4 threaded tubes into the head into a main pipe.i ended up sourcing a emissions setup off a legend on here who I can't remember the name of,. and I cut each tube about 25mm, slid a bolt inside and welded it air tight. Pain in the ass but I couldnt get the appropriate bung cheap enouhh

[corollaart]

Yes these are for the really helpful air pump.

 

Just block them as parrot suggested.

 

rob

[oldie]

Thanks guys,blocking on the way,will see if I can get some threaded bolts,cut to length and slot them so I can screw them in,then just use a heap of thread seal or similiar to make sure they don't leak through the thread.

Pete.

[parrot]

I would head out to pickapart and see what you can find on some of the heads there?

[oldie]

went to the local bolt shop and bought plugs direct over the counter,approx 15mm depth and hex key heads,got 7 of them because I have 2 heads and only 1 plug.cost me $25 for the seven plugs and a bottle of permatex high temp thread seal cement so we're ready to get busy again.