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Thread: how to turn up fuel...in pictures?

  1. #21
    LLM/Member 785 Recovry4x4's Avatar
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    Quote Originally Posted by frodobaggins View Post
    Explain for non mechanic please
    Means use a pipe tap.
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  2. #22
    2 Star General nhdiesel's Avatar
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    Drill hole to proper size, run pipe tap down to proper depth, install pyro.

    Most pyro sensors are 1/8-27 NPT. Tap drill size is .332", or letter "Q" bit.

    Depth of thread: Official technique to get proper depth is to run the tap in 12 turns. I just go by eye though, and tap until the threads are cut enough to have a full, clean thread, then adjust for the job. For something like a pyro, you may not always have room to go full depth, so you can adjust as needed.

    Jim
    1962 M35A2, LDS 427, 11.00-20 Goodyear radials, For Sale
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    General Mudstone's Avatar
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    not to be a jerk and berate anyone or even make myself come across as stupid... but if your tapping for the first time make sure you back out often enough to clear the chips out of there... not that i ever broke off a tap... ever... not one in my whole life... ok... if you ever get assigned to a 1-1CAV Bradley with taps broken off in it you can thank me.
    It is fact that those who can not kill will always fall subject to those who can.

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    2 Star General nhdiesel's Avatar
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    1962 M35A2, LDS 427, 11.00-20 Goodyear radials, For Sale
    1971(?) M35A2, NDTs, may get bobbed
    1 M105A2, rough, work trailer

  7. #25
    Moderator cranetruck's Avatar
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    Quote Originally Posted by Recovry4x4 View Post
    Means use a pipe tap.
    Actually, ream the hole for a tapered finished. Look at this about 3/4 down the page for the right reamer. The hole is drilled accordingly.
    Products

    If the hole is not tapered is a good chance that the threaded fitting wont tighten and seal properly.
    Bjorn

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  9. #26
    2 Star General nhdiesel's Avatar
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    Well I had a chance to wrench on the truck some today. I turned the fuel screw 1 turn, test drove and was careful to watch smoke. No change from where it was. Turned it 1 more full turn, very small change. I'm able to come up my hill in 4th gear now, and it only slows down a few MPH on the steepest parts. But on the flats it still has a hard time reaching 2500 rpms.

    With 1 full turn, in 3rd or 4th gear it would get to 2100 and very slowly inch its way up to 2500. In 5th gear it wouldn't get to 2500.

    At 2 turns, it was a slight bit faster from 21 to 2500 in 3rd or 4th. In 5th, it would reach 2500, but it took about a mile of holding the throttle floored to get from 2100 to 2500.

    Next step tomorrow will be to install my boost gauge to see if the turbo is even doing enough. Its not a whistler, I just hear the faintest of a whistle when its working hard. I know its doing something, just not sure if its enough.

    OH...and after the first full turn of the screw, it starts right up now without having to hold the throttle down some. So there is progress.

    Jim
    1962 M35A2, LDS 427, 11.00-20 Goodyear radials, For Sale
    1971(?) M35A2, NDTs, may get bobbed
    1 M105A2, rough, work trailer

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  11. #27
    4 Star General Billy Bobbed's Avatar
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    I just turned mine up today,what a big differance it made.I turned mine about 2 full turns.I took it out for a drive WO on flat ground.It got to around 1150 at about 2300 RPM.A light trail of black smoke.I was getting worried about the shaft turning,but everything turned out.Going to keep an eye on the pyrometer.

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    Colonel bgekky3's Avatar
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    I turned up the fuel on one of my trucks a lot, something like 3 or 4 turns. I had a pyro installed. It still would not go over 2200 RPMs. After looking into adjusting the governor, we found the return spring was too strong and prevented full throttle. After changing the spring, we turned the fuel back down.

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    Colonel ccequipment's Avatar
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    Be careful with the fuel on these because they will get hot if you stay in them for very long, keep a close eye on the Egt's even on flat ground if you stay in the throttle very long they will heat up. New fuel filters will help alot also.

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    4 Star General /Moderator doghead's Avatar
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    Or, if you tow a load or drive up a long grade. You'd be suprised how much higher your EGTs will get.
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