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Minneapolis Moline Tractors Discussion Forum
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Minnie jetstar 5

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756puller

01-31-2021 10:04:23




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Got a friend of a friend that has a jetstar 5 gas burner that is getting coolant in the oil pan. I haven't seen or worked on the tractor yet. Was wondering what all the things there engines are prone to. Im thinking head gasket or cracked head would be the cause for the coolant leaks. What's everyone idea what it could be?




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MMDEL

02-02-2021 08:08:23




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 Re: Minnie jetstar 5 in reply to 756puller, 01-31-2021 10:04:23  
Quoting Removed, click Modern View to see

Not if the weep hole is plugged with hard grease. And they usually are. The water follows the shaft to the gear case area.

MMDEL



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larry Mi

02-01-2021 06:26:36




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 Re: Minnie jetstar 5 in reply to 756puller, 01-31-2021 10:04:23  
Yes the slot lets the coolant seep out side the block. but if it is blocked then coolant goes in too oil pan. Also if that oil seal is wore it will let coolant pass too.



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756puller

02-01-2021 07:02:56




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 Re: Minnie jetstar 5 in reply to larry Mi, 02-01-2021 06:26:36  
What oil seal? I was thinking water pump would be completely separate from anything to do with oil.



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molinegb

02-01-2021 07:35:03




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 Re: Minnie jetstar 5 in reply to 756puller, 02-01-2021 07:02:56  
Water pump has an oil seal an back of impeller shaft and water seal on front.



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756puller

02-01-2021 07:43:58




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 Re: Minnie jetstar 5 in reply to molinegb, 02-01-2021 07:35:03  
Oh ok I can see what you mean now.



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molinegb

02-01-2021 15:18:21




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 Re: Minnie jetstar 5 in reply to 756puller, 02-01-2021 07:43:58  
Just rebuilt on last week. Would have to be really worn to dump into crankcase. If oil seal goes they dump oil out. If water seal goes the also dump out weephole.



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JK2

01-31-2021 17:50:13




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 Re: Minnie jetstar 5 in reply to 756puller, 01-31-2021 10:04:23  
It could likely be the water pump leaking coolant into the oil. It could also be a head gasket or a cracked head.



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swmolines

01-31-2021 16:21:13




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 Re: Minnie jetstar 5 in reply to 756puller, 01-31-2021 10:04:23  
Do you mean 5 Star? Moline did not make a Jet Star 5.



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756puller

01-31-2021 17:10:05




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 Re: Minnie jetstar 5 in reply to swmolines, 01-31-2021 16:21:13  
Yes that's what it is. Sorry I'm an ih guy. Thought the it manual said jet star 5.



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swmolines

02-01-2021 02:36:40




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 Re: Minnie jetstar 5 in reply to 756puller, 01-31-2021 17:10:05  
Not a problem. Many others have said similar things.

As said above, there is a chance that the coolant in the oil is due to a water pump seal leak. There is a drainage slot behind the water pump that is intended to keep coolant out of the oil when the seal leaks. Check to be certain the slot is open. It can get clogged with grease and dirt.



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756puller

02-01-2021 05:06:43




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 Re: Minnie jetstar 5 in reply to swmolines, 02-01-2021 02:36:40  
Is there a path directly into the block/oil pan from the slot you are talking about? My experience has always been the slot let's the colant seep to the outside of the block not the inside of the block.



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