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GearboxGen3v4Internals

BearingandSealPartNumbersB1–SKF6208C3(40x80x18mm)B2–SKF6208C3(40x80x18mm)B3–SKF6212(60x110x22mm)B4–SKF6007(35x62x14mm)B5–SKF6213C3(65x120x23mm)B6–SKF6012C3(60x95x18mm)B7–SKF6012C3(60x95x18mm)B8–SKF6207(35x72x17mm)Inputshaftseal–Harwal406207ADL(http://harwal.com/product/21159)Outputshaftseal–Harwal9011010ADL(http://harwal.com/product/23621)

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Puttingthegearboxbacktogether1. Gettherighttools.Ifyoucanborrowaprofessionalbearingheaterfrom

someoneyourjobisgoingtobeawholeloteasier.Itheatsabearingto230Finlessthan40secs.Ashoppressandabearingpullerareindispensableaswell.

2. HeatbearingB1,freezejackshaft,put/pressB1onbacksideofjackshaft.

3. HeatbearingB8,freezejackshaft,put/pressB8onfrontsideofjackshaft.

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4. HeatbearingB3,freezeinputshaft,put/pressB3onthebacksideofinputshaft.

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5. HeatbearingB2,freezeinputshaft,put/pressB2onthebacksideofinputshaft

6. FreezebearingB4,heatinputshaftintheoven,put/pressB4intothefrontside

oftheinputshaft

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7. Heatthefronthousing,freezebearingsB6andB7,pressB7firstfollowedbyB6intothehousingwherethepropshaftsits

8. Heatthefronthousing,freezebearingB5,pressB5intotheholeinthehousingwhereB6andB7justwentin.Otherbuildersmighthavefounda6213Nintheirgearboxinstead,Ifounda6213C3sothat’swhatIreplacedminewith.

9. Freezethepropflange,whilethebearingsandthehousingarestillhot,pressthe

propflangeintotheB6andB7bearings10. Clipthesnapringonthepropflangeontheinside

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11. Heatthefronthousingwithallthebearingsandthepropshaft,freezetheoutputshaft,putsomegreaseontheoutputshaftfrontspline,presstheoutputshaftintothehousingthroughallthebearingsintothepropsplineshaft.Becarefultocentertheshaftcorrectlyasthereisalipthat’sintheway(samethatmadeithardtogettheoutputshaftoutoftheassembly).Thispartisprobablythemostchallengingofall.

12. Heatthebackhousing,freezethejackshaftandinputshaft,put/pressthetwo

shaftsintothebackhousing(inputshaftfirst)

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13. Makeanewsealforbetweenthehousinghalves.EndssealedwithCAglue.

14. Putthefrontandbackhousingbacktogether,usethreadedrodtopullthem

together

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15. Putalltheallenboltsbackin(shortoneswhereyouthinkthelongonesgo,andlongoneswhereyouthinktheshortoneswouldgo)andtorqueto210in-lbs

16. Putthetwo½”boltsbackinandtorqueto210in-lbs

17. Makenew1mmsealsforthebackplate(2ofthem).EndssealedwithCAglue.

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18. Putthebackplatebackonwithalltheshort½”boltsandtorqueto210in-lbs.19. Putthe3longboltsbackinandtorquethenutsto250in-lbs.20. Putanewvitoninputshaftsealin.

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21. PutanewVitonoutputshaftsealin

22. Putthepropflangeontheprophubwiththeallenboltsandtorqueto210in-lbs

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23. Screwthemagneticoilfillerdrainpluginthebottomofthehousingandputthe

shortboltbackinplacethatwaspreviouslyusedtoseparatethegearboxhalves

24. Fillthegearboxwithnew75W90oil(IdecidedtogiveRedline75W90)untilthe

viewglassishalffilled25. Movethegearboxupanddown,leftandrighttogettheoildistributedtoallthe

bearingsandgears

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26. Ichangedthelocationofthesnapringonthesplinetobettermakesurethesplinecannotslideoutoftheflywheeladaptertoofar.IamalsonotusingthepilotshaftonthesplineanymoreasIsuspectisforcestoomuchwearonthefemalesplineshaftteeth.Withoutthepilotshaftthesplineshouldbetterself-alignwiththeflywheeladapterandthefemalesplineshaft.

27. InstallthegearboxbackontotheH6engineplate.Makesuretogreasethespline,

flywheeladapterandgearboxfemalesplineshaftwellbeforeinstallation.28. Reinstallthepropelleronthegearboxpropellershaftandtorqueallpropeller

boltswith50ftlbs.29. Lettheproprotateacoupleoftimesbyengagingthestartermotor.Thiswillget

allthegearsandbearingswelllubricatedbeforefirststartoftheengine.

Originallocation.Splinecancomealmost¼”outoftheflywheeladapterbeforethesnapringcatchesonthegearboxside.

Newlocation.Splineisseatedthefull½”intotheflywheeladapterandcannotcomeoutanyfurtherduetothesnapringlocation.