Hole identification on 2.25 engine required, please

[drifter]

Hi team

I recently sent my engine away for a rebore and a cleansing dip. It's back now and I am preparing to reassemble it.

One of the jobs done was to replace the cam bearings (cos the dip wasn't too kind on soft metals).

Anyway, in having a look over the block and re-acquainting myself with what fits where (it was away a long time) I have discovered two holes that I can't identify.

They go from just above the plate that the fuel pump attaches to to the no.3 and no.4 cam bearings so I suspect they are a part of the oiling system.

I have looked through all of the pictures I took of the block before I sent it away and cannot see what, if anything, was attached to these holes. They have no thread so I am assuming some kind of plug goes in them.

Can anyone identify them, please?

Here are a couple of pics. The first one is of that side of the block, showing the holes just to the left of the distributor mount and above the fuel pump mount:

http://kiwi-in-oz.com/pictures/photos/800/1D322163.jpg (http://kiwi-in-oz.com/pictures/photos/2400/1D322163.jpg)

In this second pic, I have zoomed in a little closer:
http://kiwi-in-oz.com/pictures/photos/800/1D322162.jpg (http://kiwi-in-oz.com/pictures/photos/2400/1D322162.jpg)

If you want to see a bigger copy of the pic, click on it.

All input gratefully received.

[isuzutoo-eh]

Just checked, both petrol and diesel 2.25s of mine, the holes are present and not plugged in any way. Pretend they don't exist :)

[drifter]

Thanks, Mark, for the message and for actually checking it out on your own engines.

I guess mine must have been full of gunk that was cleared when the block was dipped.

Are you not concerned that they expose the 'outside' of the cam bearings?

[isuzutoo-eh]

To be honest, I didn't look close enough to see if they were blind or not. I will await the answers of the more experienced members on that one too.
Having said that, the cam bearings shouldn't move and would provide a reasonable seal to the outside world so I don't expect they'll cause any problems not being plugged.

[Blknight.aus]

from memory they are the bolt holes for the IP timing pointer on a diesel

[drifter]

Thanks Dave

So, maybe, they just tapped the diesel ones?

[Blknight.aus]

cant remember, never had an OEM timing marker for setting up the pump and I dont have my dead tree edition of the manual/parts books here that deal with the series stuff.

[peterg1001]

Just checked, both petrol and diesel 2.25s of mine, the holes are present and not plugged in any way. Pretend they don't exist :)

Same on mine, and the same goes for the third hole in line with them to the right of the distributor.

Peter

[Dinty]

G'day All, I'm sure you are talking about the 2 holes in the block behind where the distributor fits and above where the fuel pump is mounted, if so these holes had a purpose (note had) thats where the oil gallery is cross drilled so as to allow oil around the cam bearings, cheers Dennis
ps if you cleaned all the crud out you should be able to see the bearing shell.

[drifter]

G'day All, I'm sure you are talking about the 2 holes in the block behind where the distributor fits and above where the fuel pump is mounted, if so these holes had a purpose (note had) thats where the oil gallery is cross drilled so as to allow oil around the cam bearings, cheers Dennis
ps if you cleaned all the crud out you should be able to see the bearing shell.

Yup - I can clearly see the bearing shell.

So - we just leave them open?

[Dinty]

In a word YEP leave as they are cheers Dennis:angel:

[drifter]

Thanks Dennis

[justinc]

200 and 300Tdi engines have plastic plugs in them, I have dobbed a bit of Sealant in them in the past, too.

JC

[drifter]

Thanks Justin

[Johnno1969]

Yep, just leave them; should be fine. It is a long time since I rebuilt my 2.25D, but I seem to remember (like others have already mentioned) that the bearing outers block the hole nicely. I've never had any oil escape out through these holes (it's too busy escaping from other places). If it worries you, a small plug of silicon or something easily removable probably would do no harm. Perhaps somebody might know (or perhaps I should have read this thread more thoroughly), but aren't those holes useful for driving out worn bearings when the time comes?

John