Min max adjustments

Scrench

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1984 6.9 with a 4 speed manual

The engine won't Rev up like it should how can I turn the max up just a little bit more. Thanks
 

chillman88

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1984 6.9 with a 4 speed manual

The engine won't Rev up like it should how can I turn the max up just a little bit more. Thanks

Have you done anything to it recently? Mine used to do that and it needed a fuel filter and timing adjustment. Has the truck been sitting?
 

Thewespaul

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Yep, check the obvious things first like fuel filter and air filter, then make sure your throttle cable hasn’t stretched and you aren’t getting full throttle. Of all that checks put, look up the “dB2 tuning guide” I wrote
 

Scrench

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Yes I put a seal kit in it. One I scored at a yard sale. New filter new lines new lift pump new senders
 

Thewespaul

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So you put a seal kit in it from a yard sale and now it doesnt run like it should? I would be double checking things youve changed when the pump was apart.
 

Scrench

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No I bought the kit in Springfield Missouri at the stanadine dealer. I bough the ip at the yard sale it was taken all apart and thrown in a box.
 

Scrench

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Runs perfect other than seems like it doesn't rap quite high enough .
I'm thinking about turning the nut under the top cover
 

snicklas

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Could it be it was an IH or U-Haul spec pump? Those were governed to 26-2800 rpm, where the Ford spec pumps were in the 36-3800 range.
 

Thewespaul

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Yes, what rpm are you defueling at? Don’t touch anything under the top cover, that’s for big adjustments, if you read the tuning guide you will see what I said about using the guide stud adjustment to make fine adjustments to the governed rpm.

Keep in mind that if you bought a disassembled pump there’s likely a reason it was taken apart in the first place.
 

Scrench

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Could it be it was an IH or U-Haul spec pump? Those were governed to 26-2800 rpm, where the Ford spec pumps were in the 36-3800 range.
That I can't be sure of. But I would be willing to bet that you are on to something . I don't have a tachometer to determine the exact rpms . It feels like another 1000 rpms would put it where it needs to be. I'm headed to the barn to work on it right now. Thank you
 

Scrench

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Yes, what rpm are you defueling at? Don’t touch anything under the top cover, that’s for big adjustments, if you read the tuning guide you will see what I said about using the guide stud adjustment to make fine adjustments to the governed rpm.

Keep in mind that if you bought a disassembled pump there’s likely a reason it was taken apart in the first place.
OK thanks
 

Thewespaul

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2800 rpms governor and this pump has the smaller plunger size that wasn’t used in the 7.3 IDIs, it’s either a 83-85 6.9 pump or a pump off a 6.2 Detroit.

You can bring the governor up but you still have the smaller plunger size, if you can get another used pump id just use this as a spare, you want a pump that starts with db2831 as the model number, calibration code 50xx and up will have the improved head and rotor, with the torque screw adjustment.
 

Scrench

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2800 rpms governor and this pump has the smaller plunger size that wasn’t used in the 7.3 IDIs, it’s either a 83-85 6.9 pump or a pump off a 6.2 Detroit.

You can bring the governor up but you still have the smaller plunger size, if you can get another used pump id just use this as a spare, you want a pump that starts with db2831 as the model number, calibration code 50xx and up will have the improved head and rotor, with the torque screw adjustment.


OK thank you for your help. I think I may just leave it the way it is. Thank you
 

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