Mercury MerCruiser 91-78473 8M0053505 Genuine OEM Alpha Drive Unit Backlash Indicator Rod Tool

Mercury MerCruiser 91-78473 8M0053505 Genuine OEM Alpha Drive Unit Backlash Indicator Rod Tool

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  • $29.95
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  • Mercury MerCruiser 91-78473 8M0053505 Genuine OEM Backlash Indicator Rod Tool
  • Checks the gear backlash on the Alpha drive units using a 14/28 tooth count and gear housing.
  • Manufacturer: Mercury MerCruiser Quicksilver Mariner
  • Model Number: Indicator Rod Tool
  • Part Number: 91-78473
  • Also Known As:
    • 78473, 8M0053505, 91-8M0053505
  • For use with:
    • 45 JET - 0G760300 THRU 0T129554
    • 45 JET - 0P017000 THRU 0P094499
    • 45 JET - 0G590000 THRU 0G760299
    • 45 JET - 9973100 THRU 0P016999
    • 50 (3 CYL.) - 0P325500 & Up
    • 50 (3 CYL.) - 0T980000 & Up
    • 50 (3 CYL.) - 1B000001 & Up
    • 50 (3 CYL.) - 0G590000 THRU 0G760299
    • 50 (3 CYL.) - 9973100 THRU 0P016999
    • 50 (3 CYL.) - 0G760300 THRU 0T979999
    • 50 (3 CYL.) - 0P017000 THRU 0P325499
    • 50 (4-STROKE)(4 CYL.) - 0P094500 THRU 0P206999
    • 50 (4-STROKE)(4 CYL.) - 0T178500 THRU 0T598999
    • 50 EFI (4 CYL.)(4-STROKE) - 0P153500 THRU 0P400999
    • 50 EFI (4 CYL.)(4-STROKE) - 0P401000 THRU 0P515896
    • 50 EFI (4 CYL.)(4-STROKE) - 0T409000 THRU 1B344306
    • 50 EFI (4 CYL.)(4-STROKE) - 1C000001 THRU 1C050251
    • 55 (3 CYL.) - 0P325500 & Up
    • 55 (3 CYL.) - 0T980000 & Up
    • 55 (3 CYL.) - 0G760300 THRU 0T979999
    • 55 (3 CYL.) - 0P017000 THRU 0P325499
    • 55 (3 CYL.) - 0G590000 THRU 0G760299
    • 55 (3 CYL.) - 9973100 THRU 0P016999
    • 60 (3 CYL.) - 0P325500 & Up
    • 60 (3 CYL.) - 0T980000 & Up
    • 60 (3 CYL.) - 0G760300 THRU 0T979999
    • 60 (3 CYL.) - 0P017000 THRU 0P325499
    • 60 (3 CYL.) - 0G590000 THRU 0G760299
    • 60 (3 CYL.) - 9973100 THRU 0P016999
    • 60 (3 CYL.) BIGFOOT - 0G760300 THRU 0T979999
    • 60 (3 CYL.) BIGFOOT - 0P017000 THRU 0P325499
    • 60 (3 CYL.) BIGFOOT - 0G590000 THRU 0G760299
    • 60 (3 CYL.) BIGFOOT - 9973100 THRU 0P016999
    • 60 (4-STROKE)(4 CYL.) - 0P094500 THRU 0P206999
    • 60 (4-STROKE)(4 CYL.) - 0T178500 THRU 0T598999
    • 60 EFI (4 CYL.)(4-STROKE) - 0P153500 THRU 0P400999
    • 60 EFI (4 CYL.)(4-STROKE) - 0P401000 THRU 0P515896
    • 60 EFI (4 CYL.)(4-STROKE) - 0T409000 THRU 1B344306
    • 60 EFI (4 CYL.)(4-STROKE) - 1C000001 THRU 1C050251
    • 65 JET - 0D283222 THRU 0G760299
    • 65 JET - 0G760300 THRU 0T979999
    • 65 JET - 0P017000 THRU 0P325499
    • 65 JET - 9793577 THRU 0P016999
    • 65 JET (3 CYL.) - 0T980000 THRU 0T999999
    • 65 JET (3 CYL.) - 1B000001 & Up
    • 75 (3 CYL.) - 0D283222 THRU 0G760299
    • 75 (3 CYL.) - 0G760300 THRU 0T979999
    • 75 (3 CYL.) - 0P017000 THRU 0P325499
    • 75 (3 CYL.) - 0P325500 & Up
    • 75 (3 CYL.) - 0T980000 THRU 0T999999
    • 75 (3 CYL.) - 1B000000 & Up
    • 75 (3 CYL.) - 1B000001 & Up
    • 75 (3 CYL.) - 9793577 THRU 0P016999
    • 75 (4-STROKE) - 0G960500 THRU 0T800999
    • 75 (4-STROKE) - 0T801000 THRU 1B226999
    • 75 (4-STROKE)(BODENSEE) - 0G960500 THRU 0T800999
    • 75 (4-STROKE)(BODENSEE) - 0T801000 THRU 1B226999
    • 80 JET - 0D283222 THRU 0G760299
    • 80 JET - 0G760300 THRU 0T979999
    • 80 JET - 0P017000 THRU 0P325499
    • 80 JET - 9793577 THRU 0P016999
    • 80 JET - 0T980000 THRU 0T999999
    • 80 JET - 1B000001 & Up
    • 90 (3 CYL.) - 0D283222 THRU 0G760299
    • 90 (3 CYL.) - 0G760300 THRU 0T979999
    • 90 (3 CYL.) - 0P017000 THRU 0P325499
    • 90 (3 CYL.) - 0P325500 & Up
    • 90 (3 CYL.) - 0T980000 THRU 0T999999
    • 90 (3 CYL.) - 1B000001 & Up
    • 90 (3 CYL.) - 9793577 THRU 0P016999
    • 90 (4-STROKE) - 0G960500 THRU 0T800999
    • 90 (4-STROKE) - 0T801000 THRU 1B226999
    • MAGNUM III - 0G960500 THRU 1B226999
    • MAGNUM III - 0G303046 THRU 0G760299
    • MAGNUM III - 0G760300 THRU 0G960499
    • V-115 DFI (2.5L) - 0G960500 THRU 0T178499
    • V-135 - 0G960500 THRU 0T178499
    • V-135 - 0G303046 THRU 0G760299
    • V-135 - 0G760300 THRU 0G960499
    • V-135 DFI (2.5L) - 0G960500 THRU 0T178499
    • V-135 DFI (2.5L) - 0G590000 THRU 0G760299
    • V-135 DFI (2.5L) - 0G760300 THRU 0G960499
    • V-135 DFI (2.5L) - 0T178500 THRU 0T800999
    • V-135 DFI (2.5L) - 0T801000 THRU 1B226999
    • V-135 DFI (2.5L) - 1B227000 THRU 1B417701
    • V-135 DFI (2.5L) - 1B417702 & Up
    • V-140 (INTERNATIONAL) - 0T178500 THRU 1B226999
    • V-150 - 0G960500 THRU 1B226999
    • V-150 - 0G303046 THRU 0G760299
    • V-150 - 0G760300 THRU 0G960499
    • V-150 (EFI) - 0G303046 THRU 0G760299
    • V-150 (EFI) - 0G760300 THRU 0G960499
    • V-150 (EFI) - 0G960500 THRU 0T408999
    • V-150 DFI (2.5L) - 0G960500 THRU 0T178499
    • V-150 DFI (2.5L) - 0G590000 THRU 0G760299
    • V-150 DFI (2.5L) - 0G760300 THRU 0G960499
    • V-150 DFI (2.5L) - 0T178500 THRU 0T800999
    • V-150 DFI (2.5L) - 0T801000 THRU 1B226999
    • V-150 DFI (2.5L) - 1B227000 THRU 1B417701
    • V-150 DFI (2.5L) - 1B417702 & Up
    • V-150 EFI (2.5L) - 0T409000 THRU 0T800999
    • V-150 EFI (2.5L) - 0T801000 THRU 1B226999
    • V-150 EFI (2.5L) - 1B227000 & Up
    • V-175 - 0G303046 THRU 0G760299
    • V-175 - 0G760300 THRU 0G960499
    • V-175 (EFI) - 0G303046 THRU 0G760299
    • V-175 (EFI) - 0G760300 THRU 0G960499
    • V-175 (EFI) - 0G960500 THRU 0T408999
    • V-175 DFI (2.5L) - 0T178500 THRU 0T800999
    • V-175 DFI (2.5L) - 0T801000 THRU 1B226999
    • V-175 DFI (2.5L) - 1B227000 THRU 1B417701
    • V-175 DFI (2.5L) - 1B417702 & Up
    • V-175 EFI (2.5L) - 0T409000 THRU 0T800999
    • V-200 - 0G960500 THRU 1B226999
    • V-200 - 0G303046 THRU 0G760299
    • V-200 - 0G760300 THRU 0G960499
    • V-200 (EFI) - 0G303046 THRU 0G760299
    • V-200 (EFI) - 0G760300 THRU 0G960499
    • V-200 (EFI) - 0G960500 THRU 0T408999
    • V-200 EFI (2.5L) - 0T409000 THRU 0T800999
    • V-200 EFI (2.5L) - 0T801000 THRU 1B226999
    • V-200 EFI (2.5L) - 1B227000 & Up
    • XR-6 - 0G960500 THRU 1B226999
    • XR-6 - 0G303046 THRU 0G760299
    • XR-6 - 0G760300 THRU 0G960499
    • 75 HP (1999) - 0E345000 THRU 0E369299
    • 90 HP (1996) - 0E138600 THRU 0E202999
    • 90 HP (1997) - 0E203000 THRU 0E287999
    • 90 HP (1998) - 0E288000 THRU 0E344999
    • 90 HP (1999) - 0E345000 THRU 0E369299
    • ALPHA ONE (GEN.II) 1998 AND UP - 0L100040 & Up
    • 100 (4 CYL.) - 0D283222 THRU 0G760299
    • 100 (4 CYL.) - 0G760300 THRU 0G965520
    • 100 (4 CYL.) - 0P017000 THRU 0P058999
    • 100 (4 CYL.) - 9793577 THRU 0P016999
    • 105 JET - 0G303046 THRU 0G760299
    • 110 Jet (2.5L) - 1B690542 & Up
    • 115 (4 CYL.) - 0D283222 THRU 0G760299
    • 115 (4 CYL.) - 0G760300 THRU 0T979999
    • 115 (4 CYL.) - 0P017000 THRU 0P325499
    • 115 (4 CYL.) - 9793577 THRU 0P016999
    • 115 (4 CYL.) - 0P325500 & Up
    • 115 (4 CYL.) - 0T980000 THRU 0T999999
    • 115 (4 CYL.) - 1B000001 & Up
    • 115 EFI (4-STROKE) - 0T178500 THRU 0T800999
    • 115 EFI (4-STROKE) - 0T801000 THRU 1B226999
    • 115 EFI (4-STROKE) - 1B227000 THRU 1B366822
    • 125 (4 CYL.) - 0D283222 THRU 0G760299
    • 125 (4 CYL.) - 0G760300 THRU 0T979999
    • 125 (4 CYL.) - 0P017000 THRU 0P325499
    • 125 (4 CYL.) - 9793577 THRU 0P016999
    • 125 (4 CYL.) - 0P325500 & Up
    • 125 (4 CYL.) - 0T980000 THRU 0T999999
    • 125 (4 CYL.) - 1B000001 & Up
    • 135 VERADO (4-STROKE)(4 CYL.) - 0P419487 THRU 0P464487
    • 135 VERADO (4-STROKE)(4 CYL.) - 0P464488 THRU 0P514868
    • 135 VERADO (4-STROKE)(4 CYL.) - 1B227000 THRU 1B381711
    • 135 VERADO (4-STROKE)(4 CYL.) - 1B2270001 THRU 1B381711
    • 135 VERADO (4-STROKE)(4 CYL.) - 1B381712 THRU 1B517158
    • 135 VERADO (4-STROKE)(4 CYL.) - 0P514869 & Up
    • 135 VERADO (4-STROKE)(4 CYL.) - 1B517159 & Up
    • 140 JET - 0G960500 THRU 0T178499
    • 140 JET - 0G303046 THRU 0G760299
    • 140 JET - 0G760300 THRU 0G960499
    • 150 Pro XS (2.5L) - 1B690542 & Up
    • 150 VERADO (4-STROKE)(4 CYL.) - 0P419487 THRU 0P464487
    • 150 VERADO (4-STROKE)(4 CYL.) - 0P464488 THRU 0P514868
    • 150 VERADO (4-STROKE)(4 CYL.) - 1B227000 THRU 1B381711
    • 150 VERADO (4-STROKE)(4 CYL.) - 1B381712 THRU 1B517158
    • 150 VERADO (4-STROKE)(4 CYL.) - 0P514869 & Up
    • 150 VERADO (4-STROKE)(4 CYL.) - 1B517159 & Up
    • 175 PROXS (2.5L) - 1B516339 & Up
    • 175 VERADO (4-STROKE)(4 CYL.) - 0P419487 THRU 0P464487
    • 175 VERADO (4-STROKE)(4 CYL.) - 0P464488 THRU 0P514868
    • 175 VERADO (4-STROKE)(4 CYL.) - 1B227000 THRU 1B381711
    • 175 VERADO (4-STROKE)(4 CYL.) - 1B381712 THRU 1B517158
    • 175 VERADO (4-STROKE)(4 CYL.) - 0P514869 & Up
    • 175 VERADO (4-STROKE)(4 CYL.) - 1B517159 & Up
    • 200 (3.0L DFI)(DTS) - 0T980000 THRU 1B417701
    • 200 (3.0L DFI)(DTS) - 1B417702 THRU 1B504988
    • 200 (3.0L DFI)(DTS) - 1B504989 & Up
    • 200 (3.0L EFI) - 1B504989 & Up
    • 200 (3.0L EFI) - 0T750164 THRU 0T800999
    • 200 (3.0L EFI) - 0T750164 THRU 0T800999
    • 200 (3.0L EFI) - 0T801000 THRU 1B417701
    • 200 (3.0L EFI) - 1B417702 THRU 1B504988
    • 200 (DFI) - 0G590000 THRU 0G760299
    • 200 (DFI) - 0G960500 THRU 0T178499
    • 200 (DFI) - 0T178500 THRU 0T598999
    • 200 (DFI) - 0G760300 THRU 0G960499
    • 200 (DFI) - 0T599000 THRU 0T800999
    • 200 (DFI) - 0T599000 THRU 0T800999
    • 200 (DFI) 3.0L - 1B912786 & Up
    • 200 (DFI) 3.0L - 1B417702 THRU 1B504988
    • 200 (DFI) 3.0L - 0T801000 THRU 1B417701
    • 200 (DFI) 3.0L - 1B504989 THRU 1B912785
    • 200 PRO XS (DFI) 3.0L - 1B912786 & Up
    • 200 PRO XS (DFI) 3.0L - 1B504989 THRU 1B912785
    • 200 VERADO (4-STROKE)(4 CYL.) - 0P514869 & Up
    • 200 VERADO (4-STROKE)(4 CYL.) - 1B517159 & Up
    • 225 (3.0L CARB) - 0D280813 THRU 0G760299
    • 225 (3.0L CARB) - 0G760300 THRU 0T408999
    • 225 (3.0L EFI) - 1B504989 & Up
    • 225 (3.0L EFI) - 0T409000 THRU 0T800999
    • 225 (3.0L EFI) - 0T801000 THRU 1B417701
    • 225 (3.0L EFI) - 1B417702 THRU 1B504988
    • 225 (3.0L EFI) - 0G760300 THRU 0T408999
    • 225 (3.0L EFI) - 0G129222 THRU 0G760299
    • 225 (3.0L EFI) MARATHON - 0T801000 THRU 1B417701
    • 225 (3.0L EFI) SEAPRO - 0T801000 THRU 1B417701
    • 225 (3.0L-DFI)(DTS) - 0T599000 THRU 1B417701
    • 225 (3.0L-DFI)(DTS) - 1B417702 THRU 1B504988
    • 225 (3.0L-DFI)(DTS) - 1B504989 & Up
    • 225 (DFI) - 0G590000 THRU 0G760299
    • 225 (DFI) - 0G960500 THRU 0T178499
    • 225 (DFI) - 0T178500 THRU 0T598999
    • 225 (DFI) - 0G760300 THRU 0G960499
    • 225 (DFI) - 0T599000 THRU 0T800999
    • 225 (DFI) 3.0L - 1B417702 THRU 1B504988
    • 225 (DFI) 3.0L - 0T801000 THRU 1B417701
    • 225 (DFI) 3.0L - 1B504989 & Up
    • 225 MARATHON (3.0L CARB) - 0G245605 THRU 0G760299
    • 225 MARATHON (3.0L CARB) - 0G760300 THRU 0T408999
    • 225 SEAPRO (3.0L CARB) - 0G245605 THRU 0G760299
    • 225 SEAPRO (3.0L CARB) - 0G760300 THRU 0T408999
    • 250 (3.0L EFI) - 1B504989 & Up
    • 250 (3.0L EFI) - 0T409000 THRU 0T800999
    • 250 (3.0L EFI) - 0T409000 THRU 0T800999
    • 250 (3.0L EFI) - 0T801000 THRU 1B417701
    • 250 (3.0L EFI) - 1B417702 THRU 1B504988
    • 250 (3.0L EFI) - 0G760300 THRU 0T408999
    • 250 (3.0L EFI) - 0G129222 THRU 0G760299
    • 250 (DFI) 3.0L - 1B528615 & Up
    • 250 LONG (3.0L)(EFI) - 0T861319 & Up
    • 250XB (3.0L EFI) - 0G980600 THRU 0T800999
    • 3.0L EFI MARATHON - 0T409000 THRU 0T800999
    • 3.0L EFI SEAPRO - 0T409000 THRU 0T800999
    • 30 (4-STROKE) - 0G760300 THRU 0T408999
    • 30 (4-STROKE) - 0P017000 THRU 0P153499
    • 30 Carb (3 CYL.)(4-STROKE) - 0P153500 THRU 0P400999
    • 30 Carb (3 CYL.)(4-STROKE) - 0T409000 THRU 1B226999
    • 30 EFI (3 CYL.)(4-STROKE) - 0P153500 THRU 0P400999
    • 30 EFI (3 CYL.)(4-STROKE) - 0T409000 THRU 1B226999
    • 30 JET (3 CYL.) - 0G590000 THRU 0G760299
    • 30 JET (3 CYL.) - 9973100 THRU 0P016999
    • 30 JET (3 CYL.) - 0G760300 THRU 0T408999
    • 30 JET (3 CYL.) - 0P017000 THRU 0P153499
    • 40 (3 CYL.) - 0P325500 & Up
    • 40 (3 CYL.) - 0T980000 THRU 1B208418
    • 40 (3 CYL.) - 0T980000 THRU 1B209735
    • 40 (3 CYL.) - 0G590000 THRU 0G760299
    • 40 (3 CYL.) - 9973100 THRU 0P016999
    • 40 (3 CYL.) - 0G760300 THRU 0T979999
    • 40 (3 CYL.) - 0P017000 THRU 0P325499
    • 40 (4-STROKE) - 0G760300 THRU 0T408999
    • 40 (4-STROKE) - 0P017000 THRU 0P153499
    • 40 (4-STROKE)(4 CYL.) - 0P094500 THRU 0P206999
    • 40 (4-STROKE)(4 CYL.) - 0T178500 THRU 0T598999
    • 40 Carb (3 CYL.)(4-STROKE) - 0P153500 THRU 0P400999
    • 40 Carb (3 CYL.)(4-STROKE) - 0T409000 THRU 1B226999
    • 40 CARB (3 CYL.)(4-STROKE) - 0P401000 & Up
    • 40 CARB (3 CYL.)(4-STROKE) - 1B227000 THRU 1B344306
    • 40 CARB (3 CYL.)(4-STROKE) - 1C000001 THRU 1C018825
    • 40 CARB (3 CYL.)(4-STROKE) - 1C018826 & Up
    • 40 EFI (3 CYL.)(4-STROKE) - 0P153500 THRU 0P400999
    • 40 EFI (3 CYL.)(4-STROKE) - 0T409000 THRU 1B226999
    • 40 EFI (4 CYL.)(4-STROKE) - 0P153500 THRU 0P400999
    • 40 EFI (4 CYL.)(4-STROKE) - 0P401000 THRU 0P515896
    • 40 EFI (4 CYL.)(4-STROKE) - 0T409000 THRU 1B344306
    • 40 EFI (4 CYL.)(4-STROKE) - 1C000001 THRU 1C050251
    • 40 JET - 0P325500 & Up
    • 40 JET - 0T980000 & Up
    • 40 JET - 0P094500 THRU 0P325499
    • 40 JET - 0T178500 THRU 0T979999
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