Mercury Quicksilver OEM Lower Starter Motor Cover 76867 | 75–150 HP 2-Stroke Outboard Crankcase

Mercury Quicksilver OEM Lower Starter Motor Cover — Part 76867

• Part Number: 76867
• Brand: Mercury Marine / Quicksilver (Genuine OEM)
• Official Product Type: Powerhead & Crankcase Covers — Lower Starter Motor Cover
• System: Powerhead — cylinder block / crankcase, starter motor cover assembly
• Diagram Position: Lower starter motor cover (bottom half of the starter cover assembly) on the cylinder block / crankcase schematic
• Supersedes: 56030 and 66761 (earlier Mercury lower starter cover references)
• Qty Required: 1 per applicable engine
• GTIN / UPC: 745061178090
• Weight: approx. 0.2 kg

What It Does

The 76867 is the genuine OEM lower starter motor cover (bottom half) used on the cylinder block and crankcase assembly of numerous classic Mercury and Mariner 2-stroke outboards. It mounts to the crankcase beneath the matching upper starter cover to form the complete protective enclosure around the starter motor. Mercury parts diagrams identify 76867 specifically as the lower / bottom starter motor cover. The same cover was used across multiple Mercury engine families and production periods, so fitment should always be confirmed by outboard serial number and the specific cylinder block / crankcase schematic rather than by horsepower alone.

Compatible Applications

Confirm fitment by outboard serial number and the specific Mercury cylinder block / crankcase diagram before ordering. Mercury used several starter-cover arrangements across its older 2-stroke engine families.

• Mercury 75 HP 4-cylinder — selected configurations
• Mercury 80 HP 4-cylinder / Mercury 800 — selected configurations
• Mercury 90 HP 3-cylinder — selected configurations
• Mercury 90 HP 6-cylinder — selected configurations
• Mercury 125 HP 4-cylinder — selected configurations
• Mercury 135 HP V6 — selected configurations
• Mercury 150 HP V6 — selected configurations
• Selected earlier Mercury and Mariner inline and V6 2-stroke configurations using the same starter-cover arrangement

Not sure it fits? Send us your Mercury or Mariner outboard serial number before ordering.

Related Starter Cover Components

The 76867 installs as the lower half of the starter motor cover assembly. The following components are commonly associated with the starter cover assembly and are sold separately:

• 428842 / 42884 — Upper starter motor cover (many later applications)
• 73279 — Lower-cover attaching screw (selected engines)
• 77065 — Cover-to-crankcase screw (selected V6 applications)
• 81742750 — Starter cover screw (later applications)
• 26993 / 8M0204647 — Lockwasher used with starter cover hardware (applicable engines)

The exact screw arrangement varies by engine family. Retain the original hardware positions and quantities during disassembly and confirm from the applicable Mercury cylinder block / crankcase diagram during reassembly.

Part Numbers & Supersession

• 76867 — Current Mercury Marine OEM reference
• 56030 — Earlier Mercury lower starter cover; superseded by 76867
• 66761 — Earlier Mercury lower starter cover; superseded by 76867

When to Replace

Replace the lower starter motor cover when:

• The cover is cracked or broken
• Mounting holes are stripped, cracked, or damaged
• The cover has become warped or distorted and will not seat correctly
• Impact or corrosion damage prevents proper fit against the crankcase
• The original cover is missing
• Starter or crankcase service reveals damage to the cover

A damaged or broken starter cover can also indicate that surrounding mounting points, fasteners, or the matching upper cover should be inspected at the same time.

Service Interval

No fixed replacement interval — replace on condition. Inspect the starter cover during any powerhead or starter motor service. Plastic covers on older outboards can become brittle with age and UV exposure and may crack during removal even if they appeared intact. If the cover shows crazing, discoloration, or stress marks at the mounting points, replace it proactively rather than risk breakage during the next service.

Installation Notes

• Confirm 76867 is identified as the lower starter motor cover in the Mercury cylinder block / crankcase diagram for your specific outboard serial number before installing
• Retain all original screws and hardware with their positions during disassembly — the screw arrangement varies by engine family and mixing hardware can result in incorrect installation
• Inspect the upper starter motor cover (428842 / 42884 on applicable engines) while the lower cover is removed and replace if cracked or damaged
• Inspect all mounting points on the crankcase for damage or corrosion before fitting the new cover
• Follow the applicable Mercury service manual for torque specifications on cover fasteners — overtightening plastic cover mounting screws can crack the cover bosses

Technical FAQ

Q: What is the difference between 76867, 56030, and 66761?
All three are lower starter motor covers for Mercury 2-stroke outboards. 56030 and 66761 are earlier part numbers that Mercury superseded to 76867. If your parts list or service record shows 56030 or 66761, order 76867. The covers serve the same function in applicable engine families.

Q: Is 76867 the complete starter cover or just one half?
76867 is the lower (bottom) half of the starter motor cover assembly only. The upper starter motor cover is a separate part — 428842 or 42884 on many later applications. If the complete starter cover assembly needs replacing, confirm both part numbers from the Mercury cylinder block / crankcase diagram for your specific engine serial number.

Q: My outboard is a Mariner — does 76867 fit?
Yes, on selected Mariner configurations that share the same cylinder block and crankcase arrangement as the Mercury applications listed. Confirm fitment by your Mariner outboard serial number and the cylinder block / crankcase schematic for your specific engine.

Q: Why does my 90 HP outboard have a different starter cover arrangement than expected?
Mercury produced 90 HP outboards in both 3-cylinder and 6-cylinder configurations over many years, and the cylinder block and starter-cover arrangement differs between these engine families. Identify your exact engine variant by serial number and match to the correct cylinder block / crankcase diagram before ordering starter-cover components.

Parts Desk Insights

The most useful thing to know about 76867 is that it is specifically the lower / bottom half of the starter motor cover — not the full cover, not a general crankcase cover, and not a MerCruiser sterndrive part. The part number spans quite a few classic Mercury and Mariner 2-stroke families, so the serial number is what ties it to a specific engine rather than the horsepower. When a customer brings in a cracked lower cover, it is worth checking the upper cover (428842 / 42884) at the same time, since both halves are typically the same age and the upper can have similar fatigue cracks at the mounting points. The screw arrangement is also engine-specific, so remind customers to keep the original hardware when removing the old cover.