• 3135990A1 Mercury MerCruiser Bearing | Genuine Quicksilver OEM Part
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3135990A1 Mercury MerCruiser Bearing | Genuine Quicksilver OEM Part

3135990A1 Mercury MerCruiser Bearing | Genuine Quicksilver OEM Part

$90.55 AUD
$90.55 AUD
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🔧 Product Description

Genuine Quicksilver Roller Bearing Assembly - Part Number: 31-35990A1

A genuine Quicksilver roller bearing assembly used across early MerCruiser I, R, MR, Alpha One, Alpha One Gen II, TR / TRS and Vazer drive applications. This bearing is commonly associated with specific MerCruiser gear ratios including 1.65 / 1.62, 1.84 / 1.81 and 1.98 / 1.94 applications.

⚙️ Key Features

  • Genuine Quicksilver OEM bearing assembly
  • Correct Mercury part number 31-35990A1
  • Tapered roller bearing assembly
  • Used in multiple MerCruiser stern drive bearing applications
  • Commonly suits I, R, MR, Alpha One and Alpha One Gen II drives with selected ratios

🚤 Compatibility

Commonly used on

  • MerCruiser I / R / MR / Alpha One and Alpha One Gen II sterndrive bearing applications
  • MerCruiser TR / TRS and Vazer drive applications where specified

Typically suits

  • Drive / ratio models:
  • MerCruiser 120 / 140 stern drive - 1967-1969
  • MerCruiser 120 / 140 / 165 stern drive - 1970-1977
  • MerCruiser 120 / 140, 1.98 ratio - 1970-1977
  • MerCruiser 165, 1.65 ratio - 1970-1977
  • MerCruiser 470 / 485, 1.84 ratio applications
  • MerCruiser 260 / 898 / 228, 1.50 ratio applications
  • MerCruiser 898 stern drive - 1978-1982
  • MerCruiser 485 stern drive - 1980-1982
  • MerCruiser 225-S / 233, 1.32 ratio stern drive - 1974-1977
  • MerCruiser 888 stern drive, 1.50 ratio - 1971-1977
  • MerCruiser IA / IB / IC stern drives - 1964
  • MerCruiser IA / IB / IC EZ-Shift - 1965-1966
  • MerCruiser R / MR / Alpha One sterndrive - 1983-1990
  • MerCruiser R / MR / Alpha One transom assembly - 1983-1990
  • MerCruiser Alpha One Gen II sterndrive and transom assembly - 1991-1995
  • MerCruiser Alpha One Gen II sterndrive and transom assembly - 1996-1997
  • MerCruiser Alpha One Gen II sterndrive and transom assembly - 1998 and up
  • MerCruiser TR / TRS stern drive - 1977-1993
  • MerCruiser 255 TRS - 1973-1974
  • MerCruiser 280 TRS - 1975-1976
  • MerCruiser Vazer drive / Vazer transom applications where 31-35990A1 is specified
  • Drive Type: MerCruiser I / R / MR / Alpha One / Alpha One Gen II / TR / TRS / Vazer
  • Ratio Notes: Commonly used on 1.65 / 1.62, 1.84 / 1.81 and 1.98 / 1.94 ratio applications
  • System Type: Sterndrive roller bearing assembly

🔌 Function

The bearing supports rotating gear and shaft components inside the sterndrive, helping maintain correct alignment and load support.

⚠️ Common Signs of Failure

  • Drive whine or growling noise
  • Rough bearing feel during rebuild
  • Metal contamination in gear oil
  • Shaft movement or preload issue
  • Bearing replacement required during upper / lower drive service

🔄 Supersession & Cross Reference

OEM Supersession Chain

  • 31-35990A1 current OEM bearing assembly reference

OEM / Related Numbers

  • 31-35990A1
  • 35990A1
  • 3135990A1
  • 31-35990A 1

Aftermarket / Verified Equivalents

  • Sierra: 18-1161
  • GLM: 21540
  • SEI Marine: 93-102-04
  • Red Rhino: R-89449
  • OMC Stern Drive cross-reference: 983891 where specified

📦 Condition

  • Genuine Quicksilver part
  • Brand new
  • Supplied in original or equivalent packaging

Shipping & Delivery

Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.

Returns & Warranty

14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.

Not sure this fits?

Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.

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