F165D - 3TN75-UN fuel injector pressure

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SK_man
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F165D - 3TN75-UN fuel injector pressure

Postby SK_man » Sat Aug 01, 2020 1:42 pm

Hello guys I am new here. i would like to kindly ask you for help with fuel injector pressure for Yanmar F165D - engine 3TN75-UN.Can you advice me what pressure i need do adjust with shims inside? injector type is: DN4SK1 or 24770-53000 or YDN-OSDYD1. I am trying to repair and if its not be possible than change to new on.

thanks in advance

Aaron
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Re: F165D - 3TN75-UN fuel injector pressure

Postby Aaron » Fri Aug 07, 2020 9:37 am

I don't have a manual for that exact engine but most of the other Yanmar engines with similar injectors are 19.6MPa. Not sure if that helps but that is as close as I can get.

winston
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Re: F165D - 3TN75-UN fuel injector pressure

Postby winston » Sat Aug 08, 2020 2:55 pm


SK_man
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Re: F165D - 3TN75-UN fuel injector pressure

Postby SK_man » Wed Nov 11, 2020 1:59 am

hello,
thank you for your reply and sorry for the later answer-didnt get a notice. I found the same document, but this document is not for this type of engine. Johndeer have direct injection marked with engine code - 3TN75-RJ - with 24Hp. Yanmar F165D has indirect injection with engine code 3TN75-UN only with 16.5 Hp. if they are using same injectors I dont know.

engine code:
3 - number of cylinders
T - Usage (Tractor)
N - Diesel
75 - Bore diameter
-
U - Indirect injection
N - ?

when I chek data during period for those injectors "ydn-osdyd1" , I found spec for this noozle Image

This spec say - 160kg/cm2 = 157 bar = 15.7 MPa - in my opinion, the pressure need to be same because of optimal working spraying. higher of lower preasure can change spraying of fuel and the engine will not work properly.

what do you think, could it be true?


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