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Info on Detroit 53 series engines; N vs others


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Old 03-15-2010, 11:00:06 AM
miltruck miltruck is offline
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Default Info on Detroit 53 series engines; N vs others

Looking for more info on the 53 series Detroit engines. Just got another 2-53 in bad need of rebuilding, and wondered if the use of N style pistons will mess with the balance of the engine? The little 20kw gen set we aready have w/ the 2-53 is a great running unit, but does not like to start if it is below 38-40F. Since it runs so good, I'm guessing that the low 17:1 compression of a standard 53 series is part of the problem. I'm also sure that the S45 injectors are the other half of the starting issue, and a newer set of N or HN(?) injectors will be an additional help.

Based on these issues, I would like to use the newer updated parts on the re-build so the starting problem is solved. Anyone have anything to add?
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Old 03-15-2010, 09:34:27 PM
John Kendrick John Kendrick is offline
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Default Re: Info on Detroit 53 series engines; N vs others

We were able to start 2-53 Detroits in weather down to 25 below. John Deere used them in several ag and industrial tractors for a few years. However, we used #1 diesel in winter, and it took a good battery and some ether. What I don't know, and will find out on my Onan liteplant in the mountains, is how the new fuel is in the cold.
Old Cowman
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Old 03-15-2010, 10:07:30 PM
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Mikey4026 Mikey4026 is offline
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Default Re: Info on Detroit 53 series engines; N vs others

Getting rid of the S series injectors will make a big difference in the way it runs. If it still starts hard, try an electric engine heater! 53's with decent compression should start into the low 20's without either.
Mikey
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Old 03-16-2010, 01:58:24 PM
miltruck miltruck is offline
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Default Re: Info on Detroit 53 series engines; N vs others

Thanks, I do expect to change out the injectors in the little gen set at some point (from S45 to N or HN45), but I still wonder about the use of the N style parts on the other 2-53 and if they will work OK.
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Old 11-05-2010, 12:47:52 PM
popie popie is offline
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Default Re: Info on Detroit 53 series engines; N vs others

Hello, The N series injectors are a major improvement over the S and the Very old HV injectors. Easier starting and less smoke is the advantage to N injector (N stands for needle valve and HV stands for high valve, I cant remember what S stands for)
but the N-45 injector is about the only injector still available for the non-turbo 53 from Detroit Diesel now. Detroit/GM diesel injectors has two configurations, symetrical and offset fuel in and out fuel nipples.
make sure you get the right ones.
Good luck.
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Old 11-05-2010, 02:46:53 PM
miltruck miltruck is offline
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Default Re: Info on Detroit 53 series engines; N vs others

Ended up using N pistons/sleeves and N45 injectors in the new engine, started for the first time about a month ago. Runs great. Total rebuild with all new bearings, cam, blower, reground crank and re-manuf rods. All new top end parts too.

The other 2-53 in the 20kw gen set was checked, and the injectors were already changed to N45s. Last weekend, I started to remove the oil cooler/filter as it was seeping oil and found that the return line from the head to the fuel supply did not have a restrictor in place, so the fuel pressure never builtup when cranking!!! Maybe it will start now after I put the new gaskets in.

For anyone looking for Detroit parts, call Leid Diesel in PA, very good to do business with, and they will have the parts on hand in stock.
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