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daf328 woes


510venture

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Hello all, hope your labor days went swimmingly. I spent mine finishing up a rebuild of a Hitachi daf328. This was the first time I've ever laid my hands on any carburetor and despite everything going seemingly well it was no surprise when it didn't work correctly. I was having the exact same issues described here which led me to the rebuild...

 

http://community.ratsun.net/topic/51630-l16-stumbles-at-wot-with-hitachi-dch328-with-video-suggestions-please/page-2

 

So I won't rehash all that. I obtained a rebuild kit and disassembled the carb into 3 sections keeping all the parts together. When I was done I had nothing left over and all seemed well. The rebuild kit lacked a boot for the accelerator pump but i figured i can find one online. When I turned the car over it took a few times to start, I assume thats normal but when it finally started the engine rev'd up and up till I finally turned the car off. It was like the throttle was wide open. I have pictures of it before the disassemble and I can post some pictures of how it sits now tomorrow, but I was wondering if anyone had a guess as to what would cause this issue post carburetor rebuild? I have changed the points, plugs, coil, fuel and air filter and that's about all. Thanks for any advice/Insults you'd want to throw at me. Also, I'm thinking about taking the advice I've read on here and getting a weber carb. What's recommended? I've heard some good things about the 32/36.

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Did you unscrew the round brass throttle plates and remove them? These do not need to be removed as they are very difficult to put back properly so they close. Use a flashlight and look at both of them. If it rubs the wall it will stick part open and rev up. The secondary should be fully closed and the primary just a hair open for idle. Take note that when cold the choke engages a fast idle cam and the engine will run at 1,600 to 2,200 RPMs to warm it quickly.

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I left them alone as I had read about them exactly what you are describing...that they are a pita and given my cars original symptoms I really believed my issue was in the accelerator pump circuit. I will check it out none the less though and I'll post a couple pics after work of how it looks. I may have incorrectly installed one of the two throttle springs...other than that I've got nothing and im fresh out of ideas. I'm on my way to a weber I suspect but I'm not giving up completely on the Hitachi. Thanks for the reply and the suggestion.

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