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fixing a cracked Z120 block

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03weim

01-07-2008 15:24:33

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I was wondering what the costs are involved in repairing and rebuilding cracked Z120 engine for a TO20 am I better off getting a rebuilt engine from one of the venders or should I repair my block and get the enginge rebuilt or just junk the tractor and get a new to me tractor?

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03weim

01-08-2008 13:00:40

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Re: fixing a cracked Z120 block in reply to 03weim, 01-07-2008 15:24:33

I just checked the oil and it stinks like gas so that explains the high oil level thanks for tip on that I am going to pull the pan and check for coolant leaks any way, the tractor has a new radiator, water pump, and hoses and the clamps are tight (I checked) in the last 3 years so the coolant is going somewhere

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Jerry/MT

01-08-2008 22:35:52

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Re: fixing a cracked Z120 block in reply to 03weim, 01-08-2008 13:00:40

Make sure that when you fill the radiator, you don"t fill it more than about a quarter of an inch above the core. The tank above the core is expansion space and any excess is going to go out the overflow. Also make sure that you have a 7 psi pressure cap on the radiator. It makes the boiling point of the coolant go up and thus prevents boiling which reduces heat transfer between the engine and the coolant and the coolant and the air.

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gshadel

01-08-2008 07:10:34

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Re: fixing a cracked Z120 block in reply to 03weim, 01-07-2008 15:24:33

03..., You need to verify your block is cracked. A white/gray deposit on your valve cover is typical of condensation in engines not run frequently & is not a sure sign of coolant in the crankcase. There is another way your crankcase will over-fill, but with gas.. if you leave the gas shutoff open (or it leaks thru) and your carb overfills with gas, gravity flow from your tank can cause it to flow thru your manifold, into pistons, and thru into the crankcase.
I"d recommend draining your oil, refilling your radiator, and if your so inclined, drop your oil pan,& leave it open for a couple days to see if you have antifreeze dripping onto the floor. In addition to cracks in the block, another source of coolant leaks is from the rubber O-rings around the piston sleeves. Those are fairly easily replaced.

George

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Martin Berry

01-11-2008 03:41:18

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Re: fixing a cracked Z129block in reply to gshadel, 01-08-2008 07:10:34

Hello, I have a to-30 with milky oil issue. I have had the head resurfaced and several head gaskets replaced. now I noticed that the oil is milky again!!. I put silver solder in as a temp repair and added a pint of sea foam for the oil. After running the motor for one half an hour I noticed moisture/vapor dripping from the l/h front three exterior head bolts. It stopped atfer a short time. my question is that is there o-ring used with the piston sleves and are any of head bolt studs screwed into the water jacket.

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03weim

01-08-2008 12:27:47

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Re: fixing a cracked Z120 block in reply to gshadel, 01-08-2008 07:10:34

I never thought about gas over filling the crankcase in the fall I had an issue with the gas leaking out of the carb if the fuel wasn't shut off. with an updraft carb I didn't think it could fill the crankcase with gas, Then seeing the oil cap covered in milkshake and reading the posts here I assumed the worst I am hoping to be able to open it up this weekend. thanks for all your help again I wish I new about this website when I first got my tractor it would have saved me a lot of time and money

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03weim

01-08-2008 03:20:46

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Re: fixing a cracked Z120 block in reply to 03weim, 01-07-2008 15:24:33

I haven't drained the coolant or the oil, I did not see any coolant in the radiator when I opened it. the oil fill cap was covered in a milky oil mix, the oil on the dipstick looked fine it was just a lot higher up the stick than normal I am going to drain the oil out this weekend and see if its full of coolant, also oil was dripping out of the down down draft tube

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DennisPinOhio

01-08-2008 04:20:39

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Re: fixing a cracked Z120 block in reply to 03weim, 01-08-2008 03:20:46

I had a similar problem, i.e. water in the oil. I bought a can of Block Seal* and installed it, following the directions very carefully. Note: you must follow the directions or it won"t work. Problem solved! *Mfg. is CRC Industries
Warminster, Pa 18974
1-800-272-8963 or www.crcindustries.com

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Duner Wi

01-07-2008 18:14:49

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Re: fixing a cracked Z120 block in reply to 03weim, 01-07-2008 15:24:33

Check this out muggywelddotcom . The 77 rod looks interesting for cast iron. Old Cars has an article on muggyweld this week.

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03weim

01-07-2008 16:18:38

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Re: fixing a cracked Z120 block in reply to 03weim, 01-07-2008 15:24:33

I'm not sure if the block is cracked I was using it to plow this morning when it started to run hot (at the normal/hot line) on the temp gauge. When I shut her down I checked the coolant level it was almost empty and the oil level on the dipstick was very high but black the oil fill cap had milky oil on it, after reading the posts on Z120 blocks I have a sick feeling about the block I am looking for a ball park price before I tear it apart I'm planning on draining the oil this weekend to see if there is coolant in it

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Jerry/MT

01-07-2008 20:44:04

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Re: fixing a cracked Z120 block in reply to 03weim, 01-07-2008 16:18:38

There are several repair procedures to repair the block;tension rod repairs and furnace braze repairs. But make sure that your block is cracked first. How could you tell the coolant level was almost empty? Did you drain the radiator and the cooling jacket on the engine and measure the water left? Was there coolant in the oil? (The oil will look milky.) Open the drain plug and see if coolant comes out first.

My original TO-30 engine had a tension rod repair. Holes were drilled into the water jacket between the sleeves and threaded rods were placed in the holes and nuts were placed on both ends of the rods and tightend to pull the block together. Lock nuts then locked the tightening nuts in place. I replaced that block because it was plumb wore out and I needed the tractor running so I bought a remanufactured short block(~$1500)and installed it. It had a furnace braze repair. I have about 300-400 hours and it runs fine. I"m sure that if you block is cracked you can just get it repaired for ~$500 with the furnace braze method. Tthe blocks ends up stress relieved in the process and are align bored after the repair.

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Gerald J.

01-07-2008 16:17:54

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Re: fixing a cracked Z120 block in reply to 03weim, 01-07-2008 15:24:33

Contact Midwest Cylinder Head at Nevada Iowa. They KNOW how to weld a block properly. 515-382-2791.

Gerald J.

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J Schwiebert

01-07-2008 16:02:57

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Re: fixing a cracked Z120 block in reply to 03weim, 01-07-2008 15:24:33

Where are the cracks? Some cracks do not hurt anything.

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Greg_Ky

01-07-2008 15:55:34

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Re: fixing a cracked Z120 block in reply to 03weim, 01-07-2008 15:24:33

Before you throw in the towel - depending on where your block is cracked check this out.

Locknstitch Poke Here

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