Questions. G705 engine problems.

[R Wyler]

I will have alot of stupid questions. I am new to MM. Mainly been around Case. Anyhow I recently bought a G705 lp. This thing had been used with water only. Also notice the front and rear blocks have welds on the RH sides of them. I tried flushing them and the radiator then discovere water leaking between the middle block and back block. Also the blocks are full of rust scale so they have to come off. Much chance of it being welded? I guess I could have these blocks checked by the head shop? I worry about the cylinder walls rusting through also. I am in Northern Okla and right now I only know of one salvage outfit that might have the blocks. Sorry for the long post. I will have alot of questions. And I am for sure getting a service manual as soon as I can. Thanks guys.

 

[Cliff Nelson]

Do the visible welds leak? The leak between the blocks is probably a frost plug that rusted through. You're right in they have to come off. Wouldn't hurt to have them pressure tested.

 

[R Wyler]

Thanks. No I did not see any leaking from the welds I could see. Tomorrow I will fill it again and look with a flashlight to try to see the location of the leak. Then Of course get the thing into the shop. I sure hope the heads are okay. They are 4210 heads. I understand there are different ones. I sure like the design of the entire tractor and engine.

 

[BenAlbert]

Just so you know... As far as pitting into the cylinder, as good machine shop can dry sleeve the blocks.

 

[R Wyler]

Thanks for the info. I will remember that. I am pretty worried about the condition of those blocks.

 

[Howard H.]

If it IS leaking from the inside freeze plugs, and you just want to patch it long enough to test it out good, if you are careful, you can usually dab some silicone on the inside of a new freeze plug and slide it into place behind the existing one.

Then use a thin taper to slide in and wedge it tightly right up behind the leaking plug.

That will get you by for a while. Also, if the head gaskets are leaking to the outside, you might try just retorquing the head bolts.

You can also usually rake quite a bit of junk out of the drain plug holes with patience and piece of stiff wire.

Though it sounds like with all the problems, you may need to take it all apart, anyway...

Howard

 

[R Wyler]

Thanks for the tip. Tomorrow I plan to check this out further. I did use baler wire today or a short piece to get some out through the drain holes with water coming out. The water manifold has crack and I went ahead and pulled it off and saw alot more build up on that side of the blocks. That is why I decided I better just tear it down. I was sick to see all this. The tractor looks pretty straight otherwise. I really want to get it going soon.

 

[Howard H.]

Well - I wouldn't worry too much about finding parts... They are still fairly plentiful...

That's one nice thing about the blocks & heads on a MM - they are pretty interchangeable compared to like a V8 or something like that.

Howard

 

[Howard H.]

I meant to ask, too - whereabouts in "Northern OK"??

I'm in the panhandle out near Guymon...

Howard

 

[R Wyler]

I am in Kay county. Right near I35. I live in Tonkawa. Good to hear parts are around I am afraid I will be needing some.

 

[William Wolter]

when the blocks rust out through the water jacket then well know an eternity has passed
they super bore those blocks so i think your fine