2.4 head - an unusual discovery!

[wobbly]

Okay, thought I would change the rocker gasket as part of a leak solving exercise.

As in other post, I found that at the back of the head , on the smooth lip that the rocker gasket sits on, was a section about 20mm wide that was about 1mm lower.

I thought that maybe it was a hard section of sealant, so tried to scrape it.....got a bit of a surprise!

The lower section came out!!

At the back of the head is a semi-circular hole - there is then an insert which sits in it. This insert is about 1mm too shallow, hence the 1mm depression.

Photo here - you can see the lip of the head, and the semi-circular cut-out:

Here is the insert:

Another shot:

Has anyone seen anything like this before?

It was sealed with gasket sealant, I guess I can do the same, then fill the depression with sealant - the new gasket should close the gap with a bit of blue hylomar.

Any thoughts.

Pete

 

[wobbly]

Had a quick look on the EPC - there is reference to a semi-circular plug:

11183‑54020 is the part number.

Does this sit in a semi-circular slot at the back of the head?

Cheers

Pete

 

[wobbly]

Had a look at a local company who sell recon heads, they have a photo of a head, on the right you can see a similar semi-circular section cut out - I'm guessing its for access to a bolt on the end of the cam or similar?

http://www.milneroffroad.com/img/productImages/11404.jpg

I can re-fit the plug with a sealant, unless there is a proper method?

Cheers

Pete

 

[Whistler74]

The semi-circle cutout will likely be for line-boring the bearing seats. Standard practice is to use sealant around the insert although 1mm seems a bit deep. Maybe a new insert is a good idea.

 

[kbushnz]

Just clean it up and float it in with a bead of sealant.
Keep the top edge flat with the top of the sealing area for the tappet cover.
Allow to cure then install tappet cover and new seal.

Other manufactures incorporate that cutout seal into the gasket.
Some use rubber 1/2 moons and in this case its an alloy one.