Crusader Dual Eye Rear Engine Mount 97905 | 1 in. Trunnion Shaft

Crusader Dual Eye Rear Engine Mount 97905 — 1 in. Trunnion Shaft

Overview

The Crusader 97905 is a dual-eye rear engine isolator mount used at the transmission/rear support position on selected Crusader marine gasoline engines. The rubber-isolated design supports the drivetrain while absorbing vibration and allowing fine engine alignment adjustments. Correct rear mount installation is essential for maintaining engine-to-transmission and propeller-shaft alignment — a deteriorated or incorrect mount can introduce vibration and accelerate drivetrain wear.

Compatible Applications

• Crusader Model 270 / 350 CID / 5.7L — documented as the starboard long-shaft dual rear mount in applicable configurations
• Crusader MP6.0L / 366 CID 6.0L — dual rear engine mounts (qty 2) with Hurth transmission mounting brackets
• Crusader MP8.1L / 496 CID 8.1L — dual rear mount support (qty 2) in the engine/transmission mount system

Fitment note — trunnion shaft diameter: The 97905 uses a 1-inch diameter trunnion shaft. Some older Crusader installations used a 7/8-inch shaft. Replacing an older 7/8-inch mount with 97905 may require modification of the engine-mounted bracket to accept the larger bore. Confirm your existing shaft diameter before ordering.

Fitment note — 97905 vs. 97906: Older engine diagrams distinguish the 97905 as the long-shaft (3.00 in.) starboard mount and the 97906 as the short-shaft (2.13 in.) port mount. Current replacement catalogs list 97905 as the replacement for both. Verify bracket and shaft requirements on older engines before substituting 97905 for an original 97906 position.

Dimensions

• Trunnion shaft diameter: 1 in.
• Trunnion shaft length: 3 in.
• Overall height: approx. 3-1/2 in.
• Mounting hole diameter: 1/2 in.

Kit Contents

• 1 × Crusader 97905 dual-eye rear engine mount assembly
• Hardware not included — reuse existing trunnion hardware or source separately

Service Interval

Inspect engine mounts at every annual service or when vibration increases. Replace when inspection shows any of the following:

• Cracked, collapsed, or separated rubber isolator sections
• Excessive engine movement at the mount
• Corroded or damaged trunnion shaft
• Distorted or worn mounting holes
• Difficulty maintaining shaft or propeller alignment
• Persistent drivetrain vibration that cannot be resolved by alignment alone

On twin-mount configurations (quantity 2), inspect both mounts at the same time and replace as a pair when possible.

Installation Notes

• Support the engine securely before removing the rear mount
• Inspect the transmission mounting bracket for wear or distortion
• Check trunnion hardware, locking nuts, and bracket bore for condition
• Set mount height to restore correct engine alignment before torquing fasteners
• Verify propeller-shaft alignment after installation
• Recheck alignment after the engine has settled on the new mounts under load
• Inspect the front mounts and related isolators at the same service visit

Supersession / Alternate Part Numbers

• 97450 → superseded by 97905
• 97514 → superseded by 97905
• 97905R → superseded by 97905
• 97905T → superseded by 97905
• 97906 → current replacement catalogs list 97905 as replacement (verify bracket/shaft before substituting on older engines)

Related Parts

• Crusader Engine Mounting Kit — OEM Part 47-8519
• Browse all Crusader Marine Engine Parts

Technical FAQ

Does 97905 replace 97906?

Current replacement catalogs list 97905 as the replacement for 97906. However, older diagrams distinguish these as different shaft lengths (97905 = 3.00 in. long-shaft, 97906 = 2.13 in. short-shaft). Confirm your bracket configuration and shaft requirements before substituting 97905 into a 97906 position on an older engine.

My engine has a 7/8-inch mount — will 97905 fit?

Not directly. The 97905 uses a 1-inch trunnion shaft. Fitting it in place of an older 7/8-inch mount requires verifying whether the engine bracket bore can accept the larger shaft, or whether bracket modification is needed.

How many rear mounts does my engine use?

Configuration varies by engine model. The 6.0L and 8.1L applications documented for 97905 use two rear mounts. Refer to your engine's parts diagram or service manual to confirm quantity for your specific build.

Should I replace both rear mounts at the same time?

Yes, on twin-mount configurations. Mismatched mount wear creates uneven engine loading and can cause alignment issues. Replacing both at the same service visit is the recommended practice.

What else should I inspect when replacing this mount?

Check the front engine mounts, transmission mounting bracket, trunnion hardware, and propeller-shaft alignment. A worn mount often indicates the adjacent hardware has also seen accelerated wear.

Parts Desk Insights

Best use case: The 97905 is the go-to rear mount for Crusader 5.7L, 6.0L, and 8.1L builds using a dual-mount rear configuration. It consolidates several older superseded part numbers under one current SKU, making it the correct choice for most rear-mount replacement jobs on these engine families. It ships as a single mount — confirm quantity needed before ordering, as twin-mount applications require two.

Common customer questions: The most frequent point of confusion is trunnion shaft diameter — customers with older engines may have 7/8-inch mounts and assume 97905 is a direct swap. It is not without bracket verification. The 97905 vs. 97906 distinction also comes up regularly: current catalogs consolidate them, but customers with older part numbers from engine diagrams should be advised to confirm shaft length and bracket compatibility before completing the order. When in doubt, ask for the engine model, year, and existing part number.