3406B/C Frankenstein
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Ol’ Son, Feb 6, 2025.
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What are you doing with a 7FB pump on a 3ZJ….nothing about a 7FB pump will work on a 3ZJ with lots a work and lots of money
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Long story, 7e pump died, had no money thru this on it to go to work because it's what I had, it 7e was a 11° pump originally, this 7w was 21°, I've retarded timing to around 13-14° static, has 30% 4337 nozzles from Rochester bigger turbo 10r3787 cylinder packs, trucks far from right egts run cool but smokes around the clock makes around 40 psi boost 700 egt but is FAR FROM RIGHT @wore outFeedman Thanks this.
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@wore out doesn't haze at idle, but smokes pretty good when shifting out, lightly trails smoke on the boulevard not real good on power and fuel lol which I've seen you post on someone elsesFeedman and Deere hunter Thank this.
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So what are you doing for the higher pop pressure of the 4337 nozzles?
Money or not you’re gonna cost yourself more money than you realize.
how do you know it’s retarded to 13-14 BTDC? An educated guess or a meter.
also with the 7FB pump your running like 9 to 12 degrees advance so you can finish about 30 give or take a degree
The 3ZJ starts at 11.5 or 10.3 or 9.5 but still wants to final out at around 30 give or take a degree. So can you see why what you’re doing is not gonna work long? Because it will bolt on doesn’t mean you should. -
Get a C pump. I understand that’s not as easy as running out to the corner store.
What happened with the C pump you had? I’ve got boxes of used fairly decent stuff. I’m not trying to be a salesman here really just offering help if I can. Maybe I can help you get the C pump going till you get to better times idk. I do understand the money doesn’t grow on trees send me a PM and I’ll try to help you figure that outFeedman, Sons Hero, OLDSKOOLERnWV and 5 others Thank this. -
what a hand. Upmost respect for you at
@wore out.Feedman, Sons Hero, FullMetalJacket and 5 others Thank this. -
Thank you sir, your top notchFeedman, FullMetalJacket, OLDSKOOLERnWV and 2 others Thank this.
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After discussing things with @Oldiron94 I feel his best solution is taking the govnor section off his 7FB pump and putting it on his 3ZJ pump. That will get his timing back in order hopefully preventing cracked piston tops etc. I decided to put this out in the open forum as it may help someone else later on as these pics are directly from the service manual on how to do that. I would also like to thank @OLDSKOOLERnWV for getting them this morning.
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