Quote:
Originally Posted by Jonny042
My lack of updates doesn't necessarily mean a lack of progress, lots happening, but not much to share. Been fiddling with MFI stuff which I could write a book about. Luckily someone else has done that. I highly recommend:
PORSCHE 911
MECHANICAL FUEL INJECTION PUMP
1969-1973
A DIY STEP-BY-STEP GUIDE
Repair and calibration of the PED 6 KL... Mechanical Fuel Injection Pump At Home
By Michael J. Burgess
The book is every bit as detailed and descriptive as the title. I'm in the rebuilding phase, yesterday started re-assembling the pump. I mixed up the smallest batch of Gaurds Red Single stage ever and marked the middle of the 6 gear segments with my Loel-Corning Paint pen (a wonderful little device!)
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Well........ todays update is: DON"T DO THIS TO YOUR MFI PUMP!!! Unless you want to take it apart and put it together again for a third time.
The clearances and tolerances of the MFI pump are incredibly precise. In particular, the rack and gear segments that rotate the control sleeves have very tight tolerances and ZERO backlash.
Even a single layer of paint sitting in the root of the rack is enough to jam up the rack and keep it from moving smoothly. I ended up removing the paint, cleaned up the rack, and used a red sharpie to mark the tips of the two teeth on either side of my original paint mark.
At least I am getting good at taking the pump apart and putting it back together! I did get the crank/cam shaft installed and was able to test the pistons by flooding the fuel supply port with WD40 and turning the crank/cam. SUccess!
Tomorrow I plan to pressure test the pump head before going too much farther with the governor and compensator sections.
All part of the fun!