IMPCO RK-VFF30 , Model VFF30 Lockoff Repair Kit , Black Coded Diaphragm
The IMPCO RK-VFF30 repair kit will provide the technician information to repair the VFF30 Lockoff. Diaphragm is black - Hydrin diaphragm material is the standard material and is well suited for the most common applications.
1. Remove 10 Screws (17) from "Fuel In" cover.
2. Remove Cover (16) and Gasket (15).
3. Remove Filter (13) and screen (12).
4. Remove Screw (4) retaining Valve Spring (11).
5. Remove Valve Spring (11).
6. Using a small flat head screwdriver, remove Valve
Seat (19).
7. Gently lift up and remove the Valve Operating Pin(10).
8. With paper clip or wire, fashion a hook as shown.
9. Cutaway shows assembly of Valve Spring (11),Valve Seat (19), Valve Operating Pin (10), Seal Retaining Washer (14) and Pin Lip Seal (9). Note that removal of Valve Pin allows retaining Washer to be removed through the ¼” NPT opening labeled “Out.”
10. Insert paper-clip hook in center hole of Seal Retaining Washer (14) and remove.
11. Using the same hook, remove the Pin Seal (9) through valve jet.
12. Remove 6 Screws (1) on diaphragm cover side.
13. Remove Cover (2) and diaphragm (3). Clean covers, body and metal parts as necessary with a safety solvent and dry prior to reassembly. Do not use harsh solvents such as brake or carburetor cleaner on any of the non-metallic components as they will damage the material.
Reassembly
14. RK-VFF30 Kit Includes:
1 GI-89 Gasket (15)
1 F1-10 Filter (13)
1 S7-3 Screen (12)
1 BD1-26* Diaphragm Assy (3)
2 S1-59 Screw, 8-32 x 5/8" (1)
2 S1-100 Screw, 12-24 x 5/8" (17)
1 S4-18 Seat (Viton/Aluminum)(19)
1 S3-116 Seal, Lip Pin (9)
1 PI-15 Pin, Valve Operating (10)
1 W1-42 Washer, Seal Retaining (14)
1 H1-14236 Seal Holder Insertion Tool
1 P1-14235 Pin Insertion Tool
1 PPI-128 Instructions
2 S1-15265-001 Screw, 8-32 17/32” Taptite Torx (1)
2 S1-15266-001 Screw, 12-24 x 11/16” Torxfil (17)
1 S1-15265-002 Screw, 8-32 3/8” Taptite Torx (4)
*Standard diaphragm. See table on page 2 for optional
diaphragms.
15. Lubricate the Lip Pin Seal (9) with petroleum jelly or Vaseline and place in the Seal Holder Insertion Tool groove side up, as shown in the illustration. Note that the Seal Holder passage is tapered and the wide opening of the seal holder should be facing up.
16. Place the VFF30 Body (7) with the filter side up, as shown in the photo, on a flat surface. Ensure that the groove in the Seal (9) is visible from the top of the taper of the Seal Holder Insertion Tool.
17. Place the holder in the up position and slide the Holder and the Seal (9) into the Body (7) of the VFF30. Looking through the fuel port, position the Seal abovethe cavity of the seal recess.
18. Coat the Pin Insertion Tool with petroleum jelly and push the Seal (9) through the Holder and into the Seal recess of the VFF30 Body (7). Look through the fuel port to ensure the Seal is seated in the seal recess and that the groove in the seal is visible.
19. Use needle nose pliers to hold the Seal Retainer Washer (14).
20. Insert Seal Retainer Washer (14) in slot to hold the Lip Pin Seal (9) in place.
21. Lubricate the Pin Valve (10) with petroleum jelly and insert through hole in the Washer Retainer Seal (14) and Lip Pin Seal (9). Rotate head of Pin gently in a circular motion to ease Pin into place through the Washer, Lip Pin Seal and Body (7) housing.
22. Pin (10) properly placed in valve jet.
23. Valve Seat (19) shown with aluminum side up ready to be placed on jet.
24. Place the Seat (19) with the viton (black rubber) side down, in position on jet.
25. Spring (11) ready to be fastened in place. Be sure the arc in the center faces upward (see illustration in step 26 below).
26. Replace Spring (11) and fasten in place with Screw (4). Align the tip of Spring (over valve) and center between the 3 guide fins as shown in illustration. Tighten Screw 28-32 in-lbs. (3.2-3.6 Nm)
27. When Spring (11) is in place, lift it slightly to ensure it can move freely.
28. Insert Screen (12) and Filter (13) into recess.
29. Press Filter (13) so that’s properly seated in recess.
30. Place Gasket (15) in place and align with screw holes.
31. Insert two Screws (17) opposite each other in the “Fuel In” cover and place on Gasket (15). Thread the two Screws (17) through the gasket and into the Body (9).
32. Insert remaining 8 Screws (17) in their openings.
33. Tighten Screws (17), alternating from side to side on opposite sides of the cover until all screws are solidly set. Torque to 60-70 in-lbs. (6.8-7.9 Nm).
34. Lift Lever (6) to ensure it moves properly and verify that the Valve Pin (10) follows lever travel.
35. Turn Diaphragm (3) so the gasket side is down (see illustration on page 2) place on the Body (7) and rotate to position so the screw hole pattern aligns with the holes in the Body (there is only one position in which the holes will line up).
36. Place Cover (2) in correct position and insert Screws (1).
37. Tighten Screws (1) alternatively from side to side across cover until all are solidly fastened. Torque to 28-32 in-lbs. (3.2-3.6 Nm)
38. Pressurize the “Fuel In” opening with approximately 100 psi of air pressure. Draw a soap bubble across the Lockoff outlet and vacuum port (labeled “VAC”) to verify that no air is flowing through either opening. If air escapes, the rebuild has failed and the Lockoff must be replaced. Apply a small amount of vacuum to the port labeled “VAC” to verify the air flows freely through the outlet. Use soap and/ora commercial leak detector solution to inspect the gasket seals around the perimeter of the Lockoff for leaks. If leaks are found, the Lockoff must be replaced. If no leaks are found, the Lockoff can be reinstalled and returned to service
