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DIY Hitachi carb rebuild - Pic Heavy


Lugnutz

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This is my first Ratsun post. I just popped over from NICOforum for a visit.

For reasons of my own, I decided to rebuild my Hitachi carb. Many Nissan owners choose to buy a Weber carb instead and I have never heard anyone having regrets about doing so.

 

 

I imagine if you are reading this, you are considering a rebuild. Also, studying this thread may help you understand and solve a carb problem that you are having.

 

 

Careful observers will notice that I could not and DID NOT rebuild a few smaller parts in the middle carb body. The reason I didn't is because, try as I might, I could not get the fittings open and feared making some permanent damage to the carb. All passages did prove to be clean with generous carb cleaner spray.

 

I sure hope this works . . . here goes.

 

 

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The anti-dieseling solenoid is very hard to loosen once the carb is off the truck because you don't have good leverage. That is why getting it loose before actually removing the carb is probably a good idea. I found this out the hard way. To get to the solenoid, you must swing the accelerator pump lever arm up and out of the way. So let's do that first.

 

 

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This is my first Ratsun post. I just popped over from NICOforum for a visit.

 

I've referenced your documentation and how to's over there many times already, can't thank you enough.

 

The internet would be a much more informative place if everyone documented their projects with this much detail and dedication.

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Using your write-up, I rebuilt my carb last Saturday.  Here is a link to photos for those who have a Hitachi DHC-113.  THis is the stock carb on an '80 720 with an L20 motor and an automatic tranny.  Much of the info is still the same, but some of the parts are in different places.  Also, I noticed/expirienced that the spec for the float setting was bunk.  The truck did not run until I set the float lower.  The 3/8" measurement, recommended in the kit, was filling my float bowl all the way and flooding the truck.  After re-setting it, we were able to achieve something worth working on.

 

https://www.flickr.com/photos/33594589@N08/sets/72157644250173282/

 

 

All this aside, I plan on getting a Weber as soon as money provides.

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