[TSB] - ES2022-002 Screwlock Heli-Coil Inserts in ST1000 Starters

Affected Products: All ST1000 Air Starters

Affected Date Range: From Initial Launch

Related Issue: N/A

Issue Description: 

In some cases, when installing or re-installing bolts and/or Heli-Coil inserts to the inlet flange of a ST1000 series starter housing, bolts are not able to be properly seated into the Heli-Coil inserts.  Bolts will sometimes bind in the insert threads.

In the field, we have seen cases where the customers cannot insert the bolts into the Heli-Coil.  This is typically due to not properly applying oil to the bolts, and/or over-torqueing the bolts beyond specification.

Action:

First, the Heli-Coil inserts need to be installed in the inlet flange. The Heli-Coil cannot be installed with pneumatic impact tools.  They should be started by hand and run in with a low-impact driver or hand tool.  Inserts should be torqued with a torque wrench, set to no more than 150-inch-pounds per the spec in Figure 1.

Once the Heli-Coils are installed, the bolts can be inserted.  In our production environment, the bolts that attach the inlet flange come from the supplier pre-oiled. It is also important to note that the housing are received by us from the supplier with the inserts installed as well.  The bolts may not be pre-oiled in a service environment.

If the bolts are stripped of oil, apply a few drops of IR Air Tool Oil (Part Number "10G" for a gallon container) or similar light weight oil to the threads.

When installing the oiled bolts, they should turn with no more than 150 inch-pounds resistance until just before they bottom out. When installing the flange, as you keep tightening, you should tighten the bolts to 50-55 ft-lb.

Please note, these bolts have to be tightened in a cross-pattern to create a good seal between the inlet flange and inlet surface on the housing.

If new Heli-Coil inserts need to be procured, please see Figure 2 for the specifications.

 Torque Spec. on Inlet Flange  

• Inserts:  150 in-lb max to install new inserts;
• Bolts:  50-55 ft-lb in a cross pattern.

                                                                             Figure 1

Heli-Coil Insert Drawing:

                                                                                    Figure 2

Please see attached file for complete instructions.

Material Disposition:

Hold material 30 days for warrantable repairs, and follow instructions in the Warranty system for material return or discard.  If non-warrantable, dispose of parts properly in accordance with local regulations.

For Additional Information and assistance:
 

Browse the Knowledge Base:  https://irtoolhelp.ingersollrand.com

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 Phone:  800-483-4981 or 800-866-5457