955806 Volvo.Penta Hexagon nut

Illustration 1. 173-1530 Injector Seating Tool Group. See Chart A for item identification and part numbers. MUI Engine Procedure
This procedure can be used for 3114, 3116, and 3126 MUI Engines.1. Install a new injector brass sleeve or inspect and ream the existing sleeves as outlined in Tool Operating Manual NEHS0675. It is not necessary to ream new sleeves when using this procedure.2. Install the unit injector and align the rack bar. Do not use the small O-ring on the injector tip.3. Install holding clamp bolt (12) and tighten to 12 3 N m, 1.2 0.3 meter kg, (9 2 lb. ft.).
Illustration 2. Install Holding Clamp Bolt (12).4. Remove inlet manifold bolt (13) closest to the injector.
For a repair procedure, remove only one manifold bolt at a time. Removing all the manifold bolts could weaken or damage the manifold/head gasket material.
Illustration 3. Remove Inlet Manifold Bolt (13).5. Install MUI injector forcing cover (7) over the injector. The milled surface should line up with injector clamp bolt. The two long flat surfaces are for valve spring clearance. Refer to the "MUI Tooling" section for a warning on the sharp edges of this tool.
Make sure the slots of injector forcing cover (7) are free of nicks, scratches, or burrs. Damage in the slots will result in damage to the injector spring.
Illustration 4. Install Injector Forcing Cover.
Illustration 5. MUI Injector Forcing Cover Properly Installed.6. If assembled, back out forcing bolt (4) in forcing bridge (1) to provide clearance between the injector forcing cover and forcing bridge.7. Place a small amount of 4C-5591 Thread Lubricant on top of the injector forcing cover's wear button (10) and on the threads of forcing bolt (4).
Complete lubrication of the wear button and forcing bolt must be maintained for each injector seating procedure. Failure to relubricate each part before seating the next injector may cause premature wear or tool damage. Also, make sure the forcing bolt turns freely and does not have any damaged threads.
8. Install the forcing bridge with three 7X-0457 Bolts (5) and three 9M-1974 Hard Washers (6). Put the two long legs of the forcing bridge in the two rocker arm shaft support holes closest to the injector. The short leg of the forcing bridge with spacer (2) installed sits on the intake manifold bolt boss. [The long spacer (3) is used when the manifold is not installed.]
Illustration 6. Install Forcing Bridge.(1) MUI Forcing Bridge.(2) Short spacer leg.(5) 7X-0457 Hex Head Bolt.(6) 9M-1974 Hard Washer
Do not install the injectors "off-engine" because the injector tip will protrude from the head and be subject to damage. If the injectors are installed off-engine, make sure the bottom surface of the head is raised off the surface of the work bench.
9. Tighten forcing bridge mounting bolts (5) to 28 7 N m, 2.9 0.7 meter kg, (21 5 lb. ft.).
Damage to the head could occur if bridge mounting bolts (5) are not tightened to the specified torque.
Illustration 7. Install Forcing Bolt (4).10. Tighten the forcing bolt finger tight.11. Use a 9U-5019 Torque Wrench (14) and tighten the forcing bolt to 34 1.4 N m, 3.5 0.1 meter kg, (25 1 lb. ft.). Wait five seconds and retorque the bolt to 34 1.4 N m, 3.5 0.1 meter kg, (25 1 lb.ft.).
Illustration 8. Tighten Forcing Bolt (4) With 9U-5019 Torque Wrench (14).12. Loosen forcing bolt (4).13. Remove forcing bridge (1).14. Remove injector forcing cover (7).
Do not retighten injector clamp bolt (12) until after forcing bolt (4) and forcing bridge (1) have been removed. That bolt head can break off due to overtightening, if this procedure is not followed.
15. Retighten the injector clamp bolt (12) to 12 3 N m, 1.2 0.3 meter kg, (9 2 lb. ft.) because the coining procedure will have reduced the torque on the bolt.
Illustration 9. Retighten Clamp Bolt (12).16. If the intake manifold was not removed, install and tighten the inlet manifold bolt to 28 7 N m, 2.9 0.7 meter kg (21 5 lb. ft.)17. Repeat Steps 1 through 16 for the remaining cylinders.18. Check / set the injector synchronization.19. Install the rocker arms and the intake manifold, if removed. Check / set the valve lash and timing.MUI Tooling
The injector forcing cover (7) has two sharp edges due to the design of this tool. Be very careful not to cut yourself on these sharp edges. (Refer to Illustration 10.)
Illustration 10. Be Careful Of Sharp Edges Indicated By Arrows.The injector forcing cover was designed not to damage the injector clamp at the points of contact, as indicated by the arrows in Illustration 11. In order to do this, the material in the forcing cover is softer than the material in the injector clamp. As the tool is used, two legs (indicated by arrows in Illustration 12) may begin to round over. Keep this area free from burrs