MerCruiser MCM TR / MCM TRS Stern Drive Units Service Manual (Number 5)
This manual provides detailed service information for MerCruiser TR and TRS Stern Drives. It covers component removal, installation, and adjustments, including part numbers like 92-90018A12 for marine lube.
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Models Covered & Key Technical Specifications
Applied Quality Safety Manual: Inboard Engine (Sterndrive) Official MerCruiser MCM TR & MCM TRS Stern Drive Units Manual (Number 5) - Comprehensive Maintenance & Repair Reference Troubleshooting-Index
Operational-Scope: MCM TR / MCM TRS Stern Drive Units (90-12935 1085) | Series Record.
- Established Wattage Specs: 115 Amps at 2200-2600 P.S.I. (15173-17932 kPa) establishes the standard electrical draw.
- Operational Generation Capacity: 400-600 P.S.I. (2759-4138 kPa) controls the down circuit pressure range.
- Essential Burn-in Temperature: For optimal operation, 2200-2600 P.S.I. (15173-17932 kPa) is the recommended pressure for initial testing.
- Baseline Enclosure Specs: The drive unit requires 24-32 drive gear teeth for standard and heavy-duty configurations.
- Approved Fastener Specs: 75 lbs. in. (8 Nm) is the specified torque for pump to anchor screws.
- Measured Electrical Specs: The pump amperage draw indicates 115 Amps at 2200-2600 P.S.I. (15173-17932 kPa) Standards.
Professional Workshop Service Manual & Technical Specifications
Applied Quality Safety Manual: Inboard Engine (Sterndrive) Official MerCruiser MCM TR & MCM TRS Stern Drive Units Manual (Number 5) - Comprehensive Maintenance & Repair Reference Troubleshooting-Index
Operational-Scope: MCM TR / MCM TRS Stern Drive Units (90-12935 1085) // Technical-Domain: Inboard Engine / Sterndrive Logic // Operational-Scope: Comprehensive Maintenance & Repair Reference.
| TOP | Specification | Rating | Architecture |
|---|---|---|---|
| Gear Ratios | TR Standard: 2:1, TR Commercial: 1.5:1, TRS: 1.5:1 | Drive Shaft Gear Teeth No. (Drive/Driven): TR: 24/32, TRS: 24/32 | Gear Housing Gear Teeth No. (Drive/Driven): TR: 16/24, TRS: 16/24 |
| Lubricant Capacity | TR: Approx. 4 Qts. | TRS: Approx. 3 Qts. | |
| Torque Values | Drive Shaft to Tailstock Housing Bolts: 50 ft. lbs. (68 N.m) | Gear Housing to Drive Shaft Housing Nuts: 50 ft. lbs. (68 N.m) | Pinion Nut (TR & TRS): 150 ft. lbs. (203 N.m) |
Systematizing the service groups into:
- Section 1 - General Information: Covering important notices, basic cleaning, inspection, and troubleshooting.
- Section 2 - Removal, Installation and Adjustments: Detailing procedures for all models.
- Section 3 - Stern Drive Unit: Focusing on general information, drive shaft housing, and gear housing.
- Section 4 - Transom Assembly: Explaining component replacement and servicing.
- Section 5 - Power Trim: Covering the Oildyne and Prestolite power trim pumps.
Service procedures are documented for removal, installation, and adjustment of stern drive units. Calibration requirements are specified for components to ensure proper function. Electrical system documentation covers troubleshooting and testing. Suspension service documentation covers related procedures. Disassembly instructions are documented for various components to facilitate repair. The manual also documents torque specifications for various components to ensure proper bolt stretch prevention and assembly integrity.
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