Service Information Letter #A-141 - Hartzell Engine Technologies

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Service Information Letter Letter A-141 2900 Selma Highway Montgomery, AL 36108 USA Tel: 334-386-5400 Fax: 334-386-5450 Direct Drive Starter Motor Torque & Drive Shaft Tolerance D. Drive shaft maximum length check (1) Check the starter drive shaft maximum length by setting the starter vertically with the drive shaft down. (a) (b) (c) (d) Rotate the drive shaft by hand through one turn. Size the blocks of equal measure and width so the starter is stable. Place the mounting flange (flange with holes facing starter drive) on the blocks. Tap gently on the drive shaft rear cover with a plastic mallet. (2) Place the dial indicator on the flange surface which will be attached to the drive adapter, zero the indicator. See Fig. 4. Figure 4 - Set Dial at Zero on Flange Rev. New: April 1/11 SIL A-141 © 2011 - Hartzell Engine Technologies. - All rights reserved Page 6 of 8
Service Information Letter Letter A-141 2900 Selma Highway Montgomery, AL 36108 USA Tel: 334-386-5400 Fax: 334-386-5450 Direct Drive Starter Motor Torque & Drive Shaft Tolerance (3) Place the dial indicator on the apex of the drive shaft and record measurement. See Fig. 5. (a) The measurement recorded in step 3.D.(6) must fall in between .580 inch and .630 inch which is inclusive of the starter end play allowance. Figure 5 - Record Number at Top of Shaft E. End play determination (1) Determine if the starter falls into the allowable end play measurement by making a calculation. This is done by taking the maximum measurement found in step 3.D.(6) and subtracting the minimum measurement found in step 3.C.(5). (a) For example, if the shaft maximum measurement from step 3.D.(6) was .610 inch and the minimum measurement from step 3.C.(5) was .585 inch then subtracting .585 inch from the .610 inch will result in .025 inch end play. This is acceptable as the allowable end play range is .005 to .050 inch. (2) If the starter drive shaft end play is out of allowable range of .005 to .050 inch or the drive shaft length is beyond the min .580 or max .630 inch, repair or overhaul of the starter is recommended. Do not install starters outside of these limits on any starter drive or application. F. This inspection check does not require a log book entry unless the starter has been replaced, repaired, or overhauled. Rev. New: April 1/11 SIL A-141 © 2011 - Hartzell Engine Technologies. - All rights reserved Page 7 of 8
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Service Information Letter #A-141 - Hartzell Engine Technologies

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