I have coolant leaking from the back of the engine block.. I noticed it when i finally was parked on concrete any my friends house.. Its running down off the block where the transmission and engine come together.. Where might this coolant be coming from.. I know its not a blown head gasket because there is no oil in my coolant.. any ideas ?

 

Check for a crack in the block just below the exhaust manifold and a 53 cast into the front drivers side of the block just under the injection pump.
This sounds like a 53 block cracking problem.
If it is, do a search on Lok-n-Stitch

There is a really great link on here somewhere with tons on info. SOmeone will post it for you.

Good luck.... I am pressing mine.

 

I do believe there is a plug in the back of the block that could leak. But you might be lifting the head and leaking coolant but haven't blown the gasket yet.

IMHO

 

Sounds like the #53 Cummins boat anchor to me too. I have the same problem in my Freightliner. As for lock and stich the large truck mechanics I have dicussed this with said don't bother it will not last this goes for the idea of welding with ni rod also.

 

well, i checked for the 53 stamp and i don't have it.. So i must not have a 53 block... Also i looked for a crack below the manifold and couldnt see any.. or any sign of coolant leaking from there.. but i got underneath the truck and it seems to be coming from the back of the block.. so i think it might just be that plug thing..

 

There's a freeze plug (core plug) back there that can loosen or corrode and leak. If that's your problem, you're not the first one who has seen it.

Rusty

 

Also look close at the left rear almost at the back of the block. There is a head gasket problem that affects the right front and the left rear. It will leak from the jacket to the outside with no internal leakage.

On the back of the block below the head, you have a freeze plug that covers the water port that is used for the air compressor on the commercial engines. If this is leaking you can make a plate to cover it with gasket material same as the water port casting covers it on the commercial engine. If that is leaking, go to cummins and look at some engines that are out to see how it bolts up. You can get the gasket from cummins and either make a plate to cover it or get one from the junk yard, two bolts and you are fixed.

 

well i found out it is the head gasket leaking.. too bad... i guess now i have an excuse to buy head studs.. So, off to ATS it is.. gettin em done on thursday.. and maybe some other goodies while im at the toy store

 

So were you running the water/meth when it went? Sorry about the bad luck, but now you have an excuse for more bombs..