Freeze question

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ferret_airlift
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Freeze question

Postby ferret_airlift » Tue Apr 16, 2019 6:11 pm

We had a particularly brutal winter, and my Cub froze. I've replaced the radiator, and the lower bolster (It had been repaired before I got it, and the freeze made it lots worse). Now it's starting rough, and water sneezes out of the exhaust drain when it turns over. The oil is also milky. Any chance that this anything but a cracked block?

tst
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Re: Freeze question

Postby tst » Tue Apr 16, 2019 6:30 pm

pull the spark plugs and check them for any sign of coolant on them, turn the engine over with the plugs out and see if coolant comes out
Last edited by tst on Tue Apr 16, 2019 6:38 pm, edited 1 time in total.

ferret_airlift
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Re: Freeze question

Postby ferret_airlift » Tue Apr 16, 2019 6:49 pm

Okay, so definitely on cylinder 2 and 3, none on 4, maybe a little on 1, difficult to say.

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Urbish
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Re: Freeze question

Postby Urbish » Tue Apr 16, 2019 7:12 pm

Yikes, that doesn't sound good. Probably time to pull the head and see the extent of the damage.

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Shane N.
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Re: Freeze question

Postby Shane N. » Tue Apr 16, 2019 8:33 pm

If your bolster froze and cracked, your block probably did as well with the symptoms you describe.
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Jim Becker
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Re: Freeze question

Postby Jim Becker » Tue Apr 16, 2019 9:02 pm

Most common external signs of freeze damage:
Head: crack more-or-less front to back. If not too bad, it may look like just a paint flaw.
Block: horizontal crack on right side, high, forward of the oil filter.

Based on your description, you will need to pull the head. MAYBE the head gasket is leaking (water out of exhaust). But no oil passages go into the head. So water in oil is strong indication of internal block damage.

ferret_airlift
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Re: Freeze question

Postby ferret_airlift » Wed Apr 17, 2019 5:18 am

Dang. I was afraid of that. I'll pull the head this evening and see what I can see. So assuming a cracked block, she's more or less scrap metal?

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Re: Freeze question

Postby Stanton » Wed Apr 17, 2019 6:43 am

ferret_airlift wrote:...So assuming a cracked block, she's more or less scrap metal?


The parts that are damaged due to the freeze, yes. You can buy a used replacement engine, just like a front bolster. If you want to keep the Cub and use it, that's an option. If you're looking for a reason to scrap this Cub in favor of another, here's your opportunity. For future reference, a mix of 50/50 anti-freeze will keep most Cubs intact through winter.
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ferret_airlift
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Re: Freeze question

Postby ferret_airlift » Wed Apr 17, 2019 6:47 am

Well, I need to mow in the incoming spring. My mix was weak, and I knew that, but I wasn't concerned. Then we spent a week at -30.

Replacing a block goes a few notches above my skills and available tools. The tractor has been good enough, unfortunately.

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Re: Freeze question

Postby Cubfriend » Wed Apr 17, 2019 3:05 pm

Check with JP Tractor salvage at the bottom of the page for a reasonable priced block already hot tanked and bored or used engine.
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ricky racer
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Re: Freeze question

Postby ricky racer » Wed Apr 17, 2019 3:59 pm

Too bad you don't live closer, we could make a project out of and have you going in just a couple of weeks....
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ferret_airlift
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Re: Freeze question

Postby ferret_airlift » Thu Apr 18, 2019 4:19 pm

What are the odds a head gasket could do this? I pulled off the head, and I can discern no cracks, but it looks like the head gasket may have been letting water through

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Re: Freeze question

Postby Cubfriend » Thu Apr 18, 2019 5:18 pm

Were the head bolts sealed around the threads when removed?
Frank

ferret_airlift
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Re: Freeze question

Postby ferret_airlift » Thu Apr 18, 2019 5:27 pm

Not all of them, actually

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Re: Freeze question

Postby Cubfriend » Thu Apr 18, 2019 5:35 pm

They go into the water jacket and need to be sealed with rubberized sealant. Some others might have a recommendation of what to use.
Frank


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