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John Deere Tractors Discussion Forum
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john deere 70 diesel

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al

09-30-2003 19:03:49




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70 diesel sat for years when started leaks coolant into crankcase why???




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buickanddeere

10-02-2003 20:27:41




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 Re: john deere 70 diesel in reply to al, 09-30-2003 19:03:49  
The factory 70D head was noted for cracking. Most 70's today are wearing a 720/730 head along with larger intake valves. After a long period of sitting, old coolant could have allowed freezing and/or corrosion of gaskets and sealing surfaces..



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Blksmok

10-01-2003 10:45:57




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 Re: john deere 70 diesel in reply to al, 09-30-2003 19:03:49  
Al....remove the radiator cap when the diesel engine is running and look for any signs of oil residue or exhaust gas in the radiator. Usually a bad head gasket will leak when the engine is running and the combustion pressure or oil pressure pushes the oil or exhaust into the coolant system. Does it leak coolant into the oil if the radiator is full but you do not run the diesel engine? If so, it might be a crack in the block or head. Look at the lower water pipe casting that mounts to the head, if there are any signs of welding there, most likely the engine coolant froze at some time and cracked that piece plus possibly other parts of the engine. The 70 diesel blocks tended to crack in the injector pump compartment right under the pumps if the coolant was too weak for the outside temps.

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al

10-01-2003 08:31:00




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 Re: john deere 70 diesel in reply to al, 09-30-2003 19:03:49  
i didnt mention its a pony start is there any way that it could leak from that to the crankcase?



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F-I-T

10-01-2003 08:56:14




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 Re: Re: john deere 70 diesel in reply to al, 10-01-2003 08:31:00  
Al:

Well, all 70 Diesels were pony start, unless coverted to electric start or lawn mower engine via customization.

The pony crankcase contents are separate from the main engine crankcase. The units share coolant. If you have a leaking pony motor water pump shaft seal, you can get coolant into the pony crancase. If that is happening, and then you have a loose drain plug on the pony that is letting it's crankcase oil drip into the main engine crankcase, you could get coolant into the main engine crankcase that way, though I've never seen that occur.

Frank

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Clooney

10-01-2003 03:25:48




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 Re: john deere 70 diesel in reply to al, 09-30-2003 19:03:49  
Al, there aren't many places the oil & coolant run that close to each other on those 70 diesels.
~As Frank said the head, or head gasket would be the first place to look.
~Run the tractor to get it hot. Then park it with the rear end higher than the front, then pull the valve cover & clean any signs of coolant from the head area, then watch it as it cools off. If it has a leak in that area you should be able to see it. If you still can't find the leak, pull the fuel injectors & crank the engine, if coolant squirts out you will have to pull the head for a look see...

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F-I-T

09-30-2003 19:28:08




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 Re: john deere 70 diesel in reply to al, 09-30-2003 19:03:49  
Al:

Could be a cracked head or block, or bad head gasket. I'd have to check but it might possible that the injector sleeves could leak coolant.

If it's the head gasket, you should be able to see bubbles in the coolant. If it's the injector tubes, you might remove the valve cover and watch for coolant flowing.

Frank



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F-I-T

09-30-2003 19:25:06




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 Re: john deere 70 diesel in reply to al, 09-30-2003 19:03:49  
Al:

Could be a cracked head or block, or bad head gasket. I'd have to check but it might possible that the injector sleeves could leak coolant.

If it's the head gasket, you should be able to see bubbles in the coolant. Or remove the valve cover and watch for coolant flowing.

Frank



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