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John Deere Tractors Discussion Forum

70D Head leaking water

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KHE 70

08-16-2005 08:45:07

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Just getting the engine closed up on my 70 D and was able to put about 3 gallons of water in the radiator. We discovered a leak in the head and believe it is leaking between the injector sleeve and the head where the little o-ring fits in. The head was supposedly pressure checked and all that good stuff. It has been recommended to put about 2 cans of Bars Leak in the water system, that this will probably cure the leak. It is at the moment a slow drip drip without any pressure on the system. We have not cranked the engine yet. Does anyone think the bars leak will cure the problem. Or, should I take the head back out and put in new o- rings and injector sleeves. I have heard the injector sleeves are priced high and are difficult to remove and install.

Thanks for any tips,

KHE 70

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KHE 70

08-16-2005 11:29:44

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Re: 70D Head leaking water in reply to KHE 70, 08-16-2005 08:45:07

Thanks guys for all the advice. I do not believe I will use the Barrs treatment. However, has anyone ever removed the injector sleeves from the head? FIT has given some input, but any other help would be appreciated.

Thanks,

KHE 70

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Blksmok

08-16-2005 10:46:02

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Re: 70D Head leaking water in reply to KHE 70, 08-16-2005 08:45:07

The proper fix (new tubes & o-rings) will be expensive as they can't be removed w/o destroying them. I'd look for a newer design head (3211/3511) which also has larger intake valves and no tubes and o-rings to leak. The older style heads (F1958R) were prone to cracking under heavy use.

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skip 33652

08-16-2005 18:13:30

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Re: 70D Head leaking water in reply to Blksmok, 08-16-2005 10:46:02

I have pulled them and saved them before.used a 1 inch round shaft.drilled a 1/2 inch hole and tapped part way. then cut 4 slots half way down through drilled and tapped area. now when you tighten bolt into it expands, hook on slide hammer and with a little luck they will come out. at half or 1/4 price(of $260) of new sleeve you can pull some out of those junk(??) 70 and R heads and sell them.

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720Deere

08-16-2005 10:27:02

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Re: 70D Head leaking water in reply to KHE 70, 08-16-2005 08:45:07

I don't think that the head needs to be removed to pull the injector sleeves. I would stay away from the snake oil cures for leaks. Be prepared to spend big bucks for new injector sleeves. Actually you would be far better off to find yourself a late 720/730 head that doesn't have the sleeves. Those heads bring about the same or less money than a pair of those injector sleeves and flow a little better than the 70 head.

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kevin l.

08-16-2005 11:10:53

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Re: 70D Head leaking water in reply to 720Deere, 08-16-2005 10:27:02

john deere parts shows 260 bucks each for the sleeves but wonder if it would be worth a shot to try and replace the o-rings if minimal damage to the sleeves. think maybe the cleaning fluids damaged the o-rings and not sure if the cleaning solution would hurt the copper sleeve.

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720Deere

08-16-2005 12:19:49

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Re: 70D Head leaking water in reply to kevin l., 08-16-2005 11:10:53

I have never heard of a non-destructive method to remove those sleeves. The method recommended by John Deere is the 1" tap method that Frank mentioned.

As I was saying before, a late model head without the sleeves can be had in good condition for around $250 plus shipping. Even with shipping of $100 you will have a much better head with zero chance of leaking sleeves.

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F-I-T

08-16-2005 10:11:34

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Re: 70D Head leaking water in reply to KHE 70, 08-16-2005 08:45:07

I'm beginning to think that a proper pressure test is an urban legend. I've heard of more supposedly "tested" heads leaking once they were installed.

Anyway like B&B and Mike say, I'd avoid Barr's. It should not leak after all that work, and now is the time to fix it.

You can try to remove the sleeves. If that doesn't work, you may have to remove the head again, but those original o-rings have about earned their stripes if they've stayed in there for over 59 years.

I think some guys have pulled them using a large tap. Thread it in and pull them out. You might have to fabricate an arrangement to do that, but I bet you can get them out.

Frank

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Mike M

08-16-2005 12:03:55

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Re: 70D Head leaking water in reply to F-I-T, 08-16-2005 10:11:34

I have had some of those cleaned and tested heads give out on me. I think the cleaning removes all the 60 years of built up natural stop leak. LOL

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720Deere

08-16-2005 12:22:11

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Re: 70D Head leaking water in reply to Mike M, 08-16-2005 12:03:55

It is especially a problem with these injector sleeves. If the head is hot tanked, it's all over for the seal on the sleeves.

I do agree that there seems to be too many failures of pressure tested castings.

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Mike M

08-16-2005 14:35:28

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Re: 70D Head leaking water in reply to 720Deere, 08-16-2005 12:22:11

I also think people are confusing pressure testing with magnafluxing. Kinda like the confusion between restored and repainted ?

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720Deere

08-16-2005 16:10:55

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Re: 70D Head leaking water in reply to Mike M, 08-16-2005 14:35:28

10-4!

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Mike M

08-16-2005 09:23:42

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Re: 70D Head leaking water in reply to KHE 70, 08-16-2005 08:45:07

I would think you could change the injector wells without pulling the head back off ?

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buickanddeere

08-16-2005 09:06:27

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Re: 70D Head leaking water in reply to KHE 70, 08-16-2005 08:45:07

Running with two cans of Barrs Leaks will un do all the work you just did on the engine. What is the head's casting number? How did you torque down the injectors and what condition is the "frog" in?

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