Lower Micron Fuel Filter Mod - Page 4 - PeachParts Mercedes-Benz Forum

Diesel911 · #1 06-14-2008, 11:50 AM

DeliveryValve had the idea and did the research on using the Baldwin fuel/water separator BF7591-D (with a drain) in place of the stock 10 Micron secondary fuel filter.The Baldwin BF7591-D according to the Baldwin rep is rated between 1 or 2 microns and it is a fuel/water separator in which includes a drain. It fits perfectly on the base with no grinding at all, but needs a M16x1.5 filter bolt. He also provided all of the material and funds for the project.

DeliveryValve’s idea is in post #11 and my idea is in post #5
Lowest Fuel Filter Micron Rating
2 problems were that the BF7591-D has 16mmx1.5 threads and the stock filter has 14mmx1.5 which meant that a larger 16mm bolt would be needed and that the Filter Housing would need to be threaded for the 16mm bolt. (The sealing of the central bolt to the filter housing would be similar to the older style central bolt with the crush washer at the top.)
My part of the project was to thread the filter housing and drill holes through the center and across the provided 16 mm bolt.
The only real problem that came up was that the Bolt Head was too large for me to slip it behind the Lathe Chuck Jaws and would not allow the Lathe Chuck Jaws to close on the threaded shaft of the bolt. I had to swap ends and drill through the head of the bolt which meant that I had to drill the whole length of the bolt; which I had not intended to do. The reason for not wanting to drill the length of the bolt is that chips can build up inside and you can snap a drill off. This meant drilling a little and pulling the drill all the way out; clearing the chips repeating the same process over and over until the hole is safely drilled completely through the length of the bolt.
Now I had an unintended hole in the head of the bolt to plug up. I decided to tap it for ¼”x28 threads and turn it into a bolt you could use to bleed the air out of the filter when you change filters; instead of having to loosen a banjo bolt.
When I cross drilled the bolt I drilled through both sides of the bolt so if the holes look small in the Pics remember there is 2 holes instead of the 1 bigger hole that the stock central bolt has.
The first Pic is one I copied from Delivery valve the rest I took.
Depending on what is under the filter (may be different with different car/engine models) an adapter plate may need to be made to move the filter 1” or so away so that there is clearance under the filter for the filter to be changed.