Help me plug my hole

[Snailtrail]

It's definitely a freeze plug.

I managed to get one out. I wanted to remove one without damaging it 'too much' so i could get a few pictures of it. I used a small steel bar which i inserted into next hole towards the centre of the head, which enabled me to tap the back of the plug. It didnt take much to knock it out.

Now thats the easy way. To do it with the head still on the truck will obviously require the removal of the headbolt, then probably drilling a hole into the plug, followed by screwing in a large coarse threaded screw. You should be able to use that to pry it out.

The plug is about 35mm in from the outside of the head. The plugs OD = 12mm and ID = 9.6mm. Remember that this plug is from a 14B-T, but they should all be similar.

 

[lostmarbles]

You guys are right! I've stuffed up and I'll try and correct that post tomorrow. Edit ... Done

If you look at each pot/cylinder, then the precombustion chambers should be angled off slightly to the rear.

You can see where they should sit on the gasket by the wider-patches in the exposed-metal that rims the cylinder bores.

In my post #12, I have these "patches" angled towards the front so I must have inadvertently photographed the gasket upside-down. Doh!

(I need to get out the camera and take a fresh photo to correct that post.)


PS. And Snailtrail. Great discovery! Sorry for misinterpreting! I find those mysterious horizontal holes with their plugs fascinating. (I wonder why I've never heard of people replacing those when they replace their more-visible freeze plugs!)

 

[RufusTheDufus]

I'm curious if those holes are a common source of oil leaks. It seems like they would be. The head bolts don't seal perfectly when torqued down.

 

[Snailtrail]

So with the plug removed i was able to measure the depth of the drilling - 107.7mm. Checking that measurement on the face of the head put the end of the drilling pretty much bang in the middle of the cylinder centre line.

Shining light down the drilling i could see it meet up with another drilling of some sort, i couldnt tell which way the other one went though. Scratched my head for awhile, then knocked out one of the larger (35-40mm ish) plugs on top of the head - which would normally be under the valvetrain. Looking in you can see where theres a small depression cast into the bottom of the.... water chamber? which the drilling meets up with, creating a circuit for the coolant to flow. I'll try getting a photo tomorrow during the day. One thing you notice peering inside - theres ALOT of water capacity in these heads!

 

[Dieseler]

You guys are great this has solved a mystery that most B owners never knew about my knowledge has stepped up a notch thanks for all your input guys hope I can return the favour one day.

 

[Dieseler]

So I tapped the hole and plugged it so far its good,I know this is a bandaid fix and there is rad fluid around my head bolt I will be ordering the new freeze plugs that go further back in the hole and fix it before I corrode a headbolt.
It was a good thing I had to remove the manifold since the bolts were loosening up and the side pan bolts where loosening which is probably why some oil was seeping down the side of the block.

 

[VTCDN]

Snailtrail
Thanks for the extra Km / Mile , good info ..
VT