CONTINENTAL AIRCRAFT ENGINE M87-16 service …

1 CONTINENTAL AIRCRAFT ENGINE TELEDYNE INDUSTRIES, INC. 1987 TELEDYNE CONTINENTAL MOTORSA ircraft Products DivisionPO Box 90 Mobile Alabama 36601 Member of GAMAG eneral AviationManufacturer s Associationservice bulletin14 August 1987TO: AIRCRAFT Manufacturers, Distributors, SubscribersSUBJECT:SLICK service BULLETIN SB1-86 AMODELSAFFECTED: O-200, O-300, O-470, IO-470, IO-520, IO-550, TSIO-360, TSIO-520, orany CONTINENTAL ENGINE equipped with Slick :See Slick service Bulletin SB1-86 AWARRANTY:TCM does not supply internal magneto parts. Order parts and filewarranty through any Slick CONTINENTAL Motors recommends compliance of the attached Slick service BulletinSB1-86A as Technical Portions AreFAA-DER ApprovedSLICKS ervice BulletinISSUEDREVISEDPAGE AIRCRAFT ProductsA Division of Unison Industries, Blackhawk Park AvenueRockford, Illinois, 611041 OF 9 ASB 1-86 ATO: AIRCRAFT Manufacturers, AIRCRAFT ENGINE Manufacturers, Distributors,Dealers, ENGINE Overhaul Facilities, Owners and Operators of SlickAircraft :Impulse Coupling InspectionBACKGROUNDINFORMATION:The service History of Slick AIRCRAFT Magnetos indicates that the required500 hour inspection of impulse couplings is not being performed or isbeing performed incorrectly.

2 Other factors influencing the airworthinessof Slick impulse couplings are operational inactivity and reinstallation atoverhaul resulting in operation beyond to perform the prescribed 500 hour inspections, maintenance,and operating of the magneto beyond the ENGINE TBO voids Slickwarranty and may jeopardize the airworthiness of these bulletin supercedes SB1-86 dated 8/10 :As requiredPROOF OFCOMPLIANCE:Appropriate logbook AFFECTED: REQUIREDPER BULLETIN:MagnetoImpulse Coupling ModelAssemblyRotorFrame447M-2374M-989M-1 202662M-2639M-1310M-1176664M-2370M-1295M -1202667M-2371M-1219M-1202668M-2372M-193 6M-1896676M-2373M-1395M-1202680M-2369M-1 310M-18964201M-3007M-3073M-30954216M-307 6M-3047M-30944230M-3068M-3065M-30944251M -3163M-3158M-30954252M-3100M-3158M-30954 281M-3007M-3158M-30956210M-3050M-3047M-3 1016214M-3089M-3093M-3102 SLICK service BulletinISSUEDREVISEDPAGE AIRCRAFT ProductsA Division of Unison Industries, Blackhawk Park AvenueRockford, Illinois, 611042 OF 9 ASB 1-86 APARTS REQUIREDPER BULLETIN:ContinuedMagnetoImpulse CouplingModelAssemblyRotorFrame6220M-305 0M-3047M-31016224M-3089M-3093M-31026251M -3333M-3327M-30956252M-3333M-3416M-30956 280M-3050M-3047M-3101 TOOLS REQUIREDPER BULLETIN.

3 Slick T-106 impulse coupling hub puller, inch feeler gage, feeler gage, Slick Master service Manual F-1100, standard MODELSAFFECTED:All Slick impulse coupling equipped 400, 600, 4200, and 6200 MODELSAFFECTED:All engines equipped with equipped 400, 600, 4200, and 6200 seriesimpulse coupled Slick :500 HOUR INSPECTION:The following inspection procedures may be used for all 400, 600, 4200and 6200 series magneto impulse couplings, except where 500 hour impulse coupling inspections is to be performed each timethe magneto accumulates 500 hours of operation from the time of lastinspection or since new or factory rebuilt. See magneto maintenanceand overhaul manuals L-1020 and L1037 for overhaul Pre-Teardown Operation InspectionA. Prior to removing the impulse coupling from the magneto, spinthe impulse coupling in the direction of rotation stated on themagneto The impulse coupling should engage the stop pin in the magnetobelow approximately 140 RPM.

4 If the impulse coupling pawls slippast the stop pin or engage intermittently, the impulse coupling isnot operating :The speed at which the coupling pawls engage ordisengage cannot be determined accurately whenspinning the coupling by hand. Accurate service BulletinISSUEDREVISEDPAGE AIRCRAFT ProductsA Division of Unison Industries, Blackhawk Park AvenueRockford, Illinois, 611043 OF 9 ASB 1-86 Areadings for such coupling engagement ordisengagement can only be made when the magnetois driven at a constant speed by an electric motor orsimilar : The magneto will produce spark voltage whenimpulse coupling is operated. Keep hands awayfrom the distributor block and condenser stud whenimpulsing the Remove impulse Remove cotter pin, nut, washer and drive :Impulse coupling washer may be scored slightly fromcoupling nut.

5 This condition is normal and does notrequire Grasp shell of the impulse coupling assembly and gently pull theassembly outward to clear the unlatching ears of the impulsecoupling hub : Strong spring Turn shell to release spring Remove impulse shell and attach impulse Engage Slick T-106 Impulse Coupling Hub Puller into grooves inthe hub assembly. Tighten T-106 Puller Bolt and remove theimpulse coupling hub Clean Impulse CouplingA. All portions of the impulse coupling must be cleaned, exposingbare metal, to ensure a reliable Use a suitable grease dissolving solvent to remove all oil orsludge buildups on impulse Inspect CouplingFIGURE ONESLICK service BulletinISSUEDREVISEDPAGE AIRCRAFT ProductsA Division of Unison Industries, Blackhawk Park AvenueRockford, Illinois, 611044 OF 9 ASB 1-86 ANOTE: Impurity stringers, inclusions and heat checks may appearas surface discontinuities on impulse coupling conditions are normal and generally do not, bythemselves, require impulse coupling Using acceptable procedures, inspect the impulse coupling shellfor cracks, or corrosion.

6 Neither of these conditions isacceptable. Replace impulse coupling as Inspect the impulse coupling hub for cracks, or corrosion. Neitherof these conditions is acceptable. Replace impulse coupling Inspect the hub shaft and keyway for deformation or impulse coupling as Inspect impulse coupling pawls. If the latching end that contactsthe stop pin in the magneto frame is rounded, peened, orexcessively worn, replace the impulse Inspect pawl retaining rivets. If rivets are finger loose or showindications of movement, then replace the impulse Measure the clearance between the boss on the underside ofeach (2) impulse pawl and the pawl plate using a feeler the latching end of the impulse pawl over the pawl plateas shown in Figure TWOG.

7 Maximum clearance for pawls with one (1) boss is clearance for pawls with two bosses is inch forleft hand rotation couplings and inch for right hand rotationimpulse couplings. If the feeler gauge can pass between the fullwidth of the boss and the pawl plate replace the impulsecoupling. See Figure three. For coupling rotation see magnetodata service BulletinISSUEDREVISEDPAGE AIRCRAFT ProductsA Division of Unison Industries, Blackhawk Park AvenueRockford, Illinois, 611045 OF 9 ASB 1-86 AFIGURE THREEH. Inspect magneto rotor shaft. Remove burrs and chips from shaftwith a fine abrasive cloth and clean all surfaces. Chips and otherabrasives must not contact oil seal. Dimples in the rotor shaftthat affect the performance of the impulse coupling require rotorshaft replacement.

8 See Figure FOUR5. Reassemble Impulse Lubricate the pawl assembly with AIRCRAFT ENGINE oil. Ensure that thepawls move Lubricate the hub and spring with AIRCRAFT ENGINE Assemble the inner eye of the spring into the groove in the hub. Setthe shell on the hub. There should be no spring tension in Hold the shell in one hand and the pawls with the thumb andforefinger of the other Pull the hub straight back slowly and far enough to clear theprojections on the Hold the shell stationary and rotate the hub to wind the spring untilthe projections on the outer section of the pawl plate pass theprojections on the shell. (Approximately one quarter revolution, 90 )DO NOT WIND SPRING MORE THAN service BulletinISSUEDREVISEDPAGE AIRCRAFT ProductsA Division of Unison Industries, Blackhawk Park AvenueRockford, Illinois, 611046 OF 9 ASB 1-86AG.

9 Make sure that the shell is seated on the hub and that it turns Inspect Stop PinA. 400/600 Series MagnetosFIGURE FIVE1. Verify that the stop plate is held securely by the M-912 snap Remove M-908 stop plate by prying M-912 snap ring from themagneto frame retaining groove using a small Inspect the M-908 Stop Plate for cracks, or corrosion. Replace Inspect the snap ring for deformation, replace as Inspect the snap ring groove in the magneto frame. The groovemust be intact and unbroken, replace magneto frame as Inspect the retaining teeth of the stop plate and mating magnetoframe. All eight (8) retaining teeth must be engaged in the magnetoframe. No broken, missing, or deformed teeth in the magneto frameare allowed within (4) teeth either side of the stop plate.

10 If teeth arebroken, missing, or deformed, the magneto frame must be Reinstall M-908 stop plate and M-912 snap ring into magneto : The correct orientation of the stop plate is shown withmatching service BulletinISSUEDREVISEDPAGE AIRCRAFT ProductsA Division of Unison Industries, Blackhawk Park AvenueRockford, Illinois, 611047 OF 9 ASB 1-86AB. 4200/6200 Series Magnetos1. Inspect the stop pin for looseness, cracks, or corrosion. None ofthese conditions are acceptable. Replace magneto frame asnecessary. See Figure SIX2. Inspect the stop pin for flat spots. Flat spots are a normal sign ofwear and do not, by themselves, require corrective action. If theflat spots are excessive and cause the impulse coupling pawl toslip past the stop pin, either the impulse coupling, magneto frame,or both components need replacement.