MerCruiser MCM TR / MCM TRS Stern Drive Units Service Manual #5 (P/N 90-12935 1085)
326 Pages • 50.73 MB • Instant, Printable PDF
Mercruiser Models Covered & Key Technical Specifications
Models: MCM TR Stern Drive, MCM TRS Stern Drive
Sub-models / Variants: Left Hand Rotation, Right Hand Rotation, Transom Assembly with Power Steering, Transom Assembly without Power Steering
Model Years: 1985
Serial Numbers: MCM TR/TRS Transom Assembly with Power Steering 4922510 and above, MCM TR/TRS Transom Assembly without Power Steering 4922285 and above, MCM TR Stern Drive - Left Hand Rotation 5009867 and above, MCM TR Stern Drive - Right Hand Rotation 5010092 and above, MCM TRS Stern Drive - Left Hand Rotation 4895290 and above, MCM TRS Stern Drive - Right Hand Rotation 4895730 and above
Technical Data:
- Drive shaft to tailstock housing bolts torque: 50 lbs. ft. (68 N.m)
- Drive shaft to transmission output shafts torque: 35 lbs. ft. (48 N.m)
- Gimbal housing stud to inner transom plate torque: 25–30 lbs. ft. (34–41 N.m)
- Propeller nut torque: 55 lbs. ft. (75 N.m)
- Steering cable coupler nut torque: 35 lbs. ft. (48 N.m)
- Stern drive unit to bell housing attaching nuts torque: 80 lbs. ft. (109 N.m)
- Transom thickness requirement: 2 in. (51 mm) minimum to 2-1/4 in. (57 mm) maximum
Mercruiser Manual Features & Content Preview
- Covers MerCruiser MCM TR and TRS stern drive units, detailing removal, installation, and precise adjustments for both left and right-hand rotation variants.
- Original OEM factory publication (Mercury Marine form number 90-12935 1085).
- Features 47 labeled technical illustrations. You get clear exploded-view diagrams for the transom assembly, power trim pump configuration, and propeller mounting.
- This Number 5 edition serves as the definitive reference for TR and TRS series maintenance. Includes the required 10-hour break-in procedures for new or replacement gears.
Shop Maintenance & Component Documentation
This 1985 manual breaks down the complete disassembly, inspection, and adjustment of the stern drive unit, transom assembly, and power trim system. Before turning any wrenches or lifting heavy drive components, always review the listed load capacities and factory-specified tie-off points to ensure shop floor safety. The text outlines crucial maintenance intervals for the continuity circuit, shift cable pivot points, and propeller shaft lubrication. It gives technicians the specific product application requirements they need. Detailed chapters map out the removal and installation of the sterndrive units. You will find clear references to necessary specialty tools and correct sealant applications to ensure absolute integrity in harsh marine environments.
Specifications and Testing Data
Getting the numbers right matters. This publication lists exact torque specifications for critical fasteners, including the mandatory 80 lbs. ft. (109 N.m) torque required for stern drive unit bell housing studs. Inside, a comprehensive maintenance chart details tasks for pre-start, the first 20 hours, and 100-hour intervals. Because proper gear alignment is essential for smooth operation on the water, the guide provides specific tolerances for transom flatness and parallel alignment down to within 1/8 inch. Reference sections include hydraulic pressure ranges and electrical connectivity requirements for the power trim pump systems. This technical data specifically covers drives in the 4922285 and above serial range.
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