Mercury MerCruiser Rear Engine Mount Washer 12-32834

Mercury MerCruiser Rear Engine Mount Washer 12-32834

This OEM structural washer is used in the rear engine mount stack-up on MerCruiser sterndrive and select Mercury outboard applications. It maintains proper spacing, load distribution, and alignment between the engine, flywheel housing, and transom assembly small part, significant role in keeping the drivetrain properly seated and vibration-controlled.

Compatible Applications

• MerCruiser Alpha One and Alpha One Gen II sterndrive packages
• MerCruiser Bravo I, Bravo II, and Bravo III sterndrive packages
• MerCruiser 3.0L / 3.0LX, 4.3L V6, 5.0L, 5.7L / 350 Mag, 7.4L / 454, 496 Mag, and 502 Mag engine families
• Select Mercury 75 HP, 80 HP, 90 HP, 100 HP, and 115 HP EFI 4-stroke outboard applications
• Verify fitment by engine or drive serial number and Mercury parts diagram before ordering rear mount hardware varies by engine package and production range

Part Details

• OEM Part Number: 12-32834
• Also Referenced As: 32834
• Brand: Mercury / Quicksilver
• Official Product Type: Rear engine mount washer / structural washer
• System: Rear engine mount / flywheel housing / transom assembly
• Supersedes / Replaces: 12-934161, 12-93416, 8M2001219
• Condition: New OEM

Dimensions

• Inside Diameter (ID): 0.9375 (15/16)
• Outside Diameter (OD): 1.750 (1-3/4)
• Thickness: 0.172 (approx. 11/64)

Service Interval

Inspect this washer any time the rear engine mounts are serviced, the flywheel housing is removed, or the transom assembly is disassembled. Replace if the washer is crushed, split, corroded, oil-soaked, distorted, or missing from the mount stack-up.

Technical FAQ

• How many washers are in the rear mount stack-up? The number varies by engine package and mount configuration. Refer to the Mercury parts diagram for your specific engine and drive serial number to confirm the correct quantity and stack-up order.
• Can I reuse the old washer? If the washer is undamaged, flat, and free of corrosion, it can typically be reused. However, if it shows any deformation, cracking, or oil saturation, replace it a compromised washer affects mount alignment and vibration isolation.
• Does this washer fit both Alpha and Bravo drives? Yes, it is used across multiple drive families, but always verify by serial number as hardware can vary by production year and engine package.
• What replaces 12-934161 and 8M2001219? Part 12-32834 is the current Mercury OEM replacement for both of those superseded numbers.

Related Parts

• Mercury MerCruiser Quicksilver Mount Kit 8M0103028

Parts Desk Insights

The rear engine mount washer is one of those parts that gets overlooked during a mount service technicians focus on the rubber mounts and bolts and forget to check the washer stack-up. A missing or crushed washer changes the effective mount height and can cause misalignment between the engine and drive, leading to vibration, coupler wear, and premature U-joint failure. If youre replacing rear mounts, always inspect and replace the washers at the same time. The most common mistake is ordering just one washer when the diagram calls for two or more check the Mercury parts diagram for your exact engine and serial number before ordering quantity.