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John Deere Tractors Discussion Forum

JD720 diesel Injectors vs. 820 diesel Injectors

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Author  [Modern View]

07-12-2018 08:07:53

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I bought a 720 diesel cylinder head (F3511) from a machine shop that was rebuilt but never paid for by the owner. Head was planed, valves ground, etc. However, when I insert 720D injectors in it they are loose. The diameter of the hole in the head and the diameter of the injector body do not match up. They also cannot be tightened properly with the injector clamp. Could it be that the head was rebuilt to accept 820 injectors???? Does anyone know if the body diameter on the 820 injector is larger than the 720D injector???

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07-12-2018 10:47:58

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 Re: JD720 diesel Injectors vs. 820 diesel Injectors in reply to Blksmok, 07-12-2018 08:07:53  
Not very many of the original thinwall - small valve 70 diesel head castings left in service . When it is apart I would keep looking for another 720/730 head .

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07-12-2018 08:41:15

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 Re: JD720 diesel Injectors vs. 820 diesel Injectors in reply to Blksmok, 07-12-2018 08:07:53  
Only the R had an undersized injector bore. The rest of the two cylinder diesels share the same injector bodies . Tips varied from 5X10 thou, 6X10thou and 6X12 thou iirc .

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07-12-2018 09:48:10

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 Re: JD720 diesel Injectors vs. 820 diesel Injectors in reply to buickanddeere, 07-12-2018 08:41:15  
B&D....thanks! This is a "head scratcher" as the machine shop that rebuilt the head said they did not do anything to the injector hole bores. I will probably end up putting the original F1958R head back on the 70 diesel standard I'm working on. Wasted time and a new head gasket :(

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