Engine block rebore and skim

[paul connor]

Hi all. 

I have never had to undertake a rebore or skim of the block. So can advice be offered?

I have a Dodge T112 block as pictured. How much can be skimmed or has this pitting on the block face too far gone?

Furthermore, how much is too much in the bores?

Lastly, the valve insert into the block on the upper face has partially cracked in one or two valve ports and broken a piece in another. Is this repairable or game over?

Many thanks

Paul 

https://ibb.co/gF0zDGW
https://ibb.co/z7vsjVL
https://ibb.co/fHPNtQb
https://ibb.co/N9s0Yj1

 

[sirhc]

Hi Paul,

to answer your question you need to know if the bores have been done previously. You can do this by measuring but it might be easier to see if there’s any markings on the pistons +.010 for example. Once you know this you can see what oversize pistons are available. If you find a good engine machine shop they’ll be able to help you out. 

Chris 

[paul connor]

Thanks Chris.

Any idea with the valve guides? As the cast part is broken.

I have tried my TM manuals but nothing is really mentioned with tolerance for skimming and new pistons.

 

[sirhc]

That block does look quite worn but they should be able to repair the valve seats. 

[paul connor]

The pistons are 0.40. It seems via websites selling spares fot similar engines of Dodges that 0.60 is the biggest they do. So it's looking unlikely I would guess. Shame, but I shall investigate further with a machine shop if I can. 

 

[Gordon_M]

Am I right in thinking this is the T112-60001 block Paul, December 1941?  If it is, then I believe it is the very first military T112 block - It came in the very first military T112 chassis 81104100, a WC 36 Carryall, so there is a historic edge to it.  Civilian T112 blocks started T112-00001 in September 1941, so I think the '6' prefix was the identifier for the military blocks with external oil filters and so on. Certainly no other T112 block have seen had the '6' prefix.

It came to me with the T72 block I have in the TD20.  I took one look at that one ( it was the factory original block for that TD20 chassis ) and just freighted it down to a well known Dodge specialist in the south of England.  They stripped it completely, got a machine shop to bore and sleeve it, fit new guides and hardened valve seats all round, then reassembled and returned it to me.

Basically valve guides you could do, but if you are going to get valve seats done, getting the guides replaced and bores sleeved to nominal is no big deal.    Any other T112 block you can find will have worked just as hard and have as many problems, I'm sure. Let me know how you get on with it.  My mother-in-law was quite scathing when she saw it sitting dry in the garage and got me to fill the bores with waste oil.   8-)

Edited July 31, 2019 by Gordon_M

[Gordon_M]

14 minutes ago, Gordon_M said:

Build Card for the truck that block came in

 

Edited July 31, 2019 by Gordon_M

[paul connor]

Funny enough, you guess correct! 

Exactly why I would like to save it if I can. Let's hope local German engineering is up to the task! As I don't think posting it to the UK is viable, it would be a few stamps at least.

So fingers crossed HMVF for the No.1 block saving extravaganza. Do I start a crowd funding page and patrion thing, isn't that what the kids do nowadays?

 

[Gordon_M]

8 minutes ago, paul connor said:

Funny enough, you guess correct!    Exactly why I would like to save it if I can.

 

Well good luck with it.  If you get stuck just drop any other flathead six Chrysler in, they will all fit.  Don't throw that one away though, as the chassis it came in is still driving in Scotland.

[paul connor]

If it isn't repaired it will probably stay with me and be painted and used to store wine! 

[Gordon_M]

While I'm on I think that is the original head too - be great for a paperweight.  8-)

[Chris Hall]

I don’t see anything to bad there, they could fit new liners if required, new valve seats (unleaded) and valve guides. Corrosion is within the combustion area so although not ideal, wouldn’t cause a head gasket issue. I’ve seen much worse engines brought back to life but at the end of the day, cost plays a part.