|
|
Lawton MI | I hear a lot about adjusting the aneroid on 30 series fuel pumps to give them more low end grunt. What needs to be done and are there drawbacks. |
|
|
|
SE MT | dmax2001 - 3/10/2017 19:54
I hear a lot about adjusting the aneroid on 30 series fuel pumps to give them more low end grunt. What needs to be done and are there drawbacks.
On the later 30 series pumps that had a vacuum aneroid on them you can thread out the hex head plug on the back of the aneroid (rear of the pump) and look inside the hole. you'll see a star wheel that you need to turn down with a flat screwdriver (clockwise as I remember). It'll take a couple turns at least. if you go too far, it'll just smoke more. I found a happy medium where it smokes lightly on the low end, but as rpms pickup to around 1400 it really livens up and gets full fuel.
I talked with a highly recommended diesel shop that I buy pump parts through down in North Platte about this, and he actually recommended removing the aneroid off the top of the pump, then removing the rod between it and the rack, and re-installing the aneroid. this will delete it completely. I tried this, and it REALLY rolls the coal at any rpm. He told me he had no concerns about it sooting up the rings at all and has done this on many pumps. It was a little too much smoke for me, so I put the rod back in and adjusted the aneroid down to where I felt comfortable I was getting maximum low end power without clouds of smoke.
I know some of the earlier 30 series had mechanical air fuel ratio controls on them and I have no idea on how to adjust them. |
|
|
|
Saline County, Mo | I screwed the one all the way down on my 4640 and noticed nothing |
|
|
|
Central Texas | Anybody got a picture of the aneroid? |
|
|
|
SE MT | Might be able to go snap one in a bit |
|
|
|
SE MT | 4020nuts - 3/10/2017 22:04
Anybody got a picture of the aneroid?
Here's a pic from the tech manual. Adjust after removing the hex plug on back of aneroid.
Edited by dieselfume1 3/10/2017 22:53
(IMG_20170310_214817275.jpg)
Attachments ----------------
IMG_20170310_214817275.jpg (271KB - 63 downloads)
|
|
|
|
![](/profile/get-photo.asp?memberid=45833&type=profile&rnd=369) SESD | Get rid of it. Period. |
|
|
|
| Maybe someone did the delete on it already? Does it roll smoke? |
|
|
|
South Texas | In that picture, what does the screw under the cap on top of the aneroid do? |
|
|
|
Saline County, Mo | Not a lot. |
|
|
|
Fruita CO |
The screw on top adjusts how much the aneroid restricts the fuel. The star wheel adjusts the pressure at which it kicks in. Really all you need to do is screw the top screw down as far as it it will go, or as far as it takes to make the sky as dark as you want it...don't have to mess with the star wheel.
The aneroid is nothing but an emission control device. |
|
|
|
Mount Vernon, WA | Unless you like to roll coal like some 18 year old, I'd leave it be. |
|
|
|
![](/profile/get-photo.asp?memberid=57232&type=profile&rnd=547) West Central IL | . |
|
|
|
![](/profile/get-photo.asp?memberid=3085&type=profile&rnd=542)
| .. |
|
|
|
Fruita CO | Has to be done on a test stand, but a good pump guy can tighten up the regulation on the governor. Makes it open up a little quicker when a load comes on. That always seemed to help 4630's, which were the worst about no low-end. The other is to use a 40 series turbo, they make a little more boost at lower RPM. This has pretty much been taken care of by the aftermarket, I think. They mostly sell the same turbo for all 30-40 series now.
Another thing that can be done on early pumps is to remove the magnet in the rack plug...doesn't have anything to do with power or torque, but it eliminates the 1200 RPM sparrow-gassing tar-flavored run-up when it starts. Starts more like a 50 series, the excess fuel kicks out as soon as it starts.
|
|
|