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Power Trim Spanner Wrench 91-74951

Satisfaction rating 5 out of 5 (2 Ratings)
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  • This is an OEM part manufactured by Mercury Marine
  • Flat rate shipping starting at $3.95
  • 30 day return policy

Product Description

Mercury factory part. Search for more factory parts & parts diagrams.

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2 Product Reviews


Repair Difficulty
Repair Time
1 to 2 hours
All the parts I needed Great Service

Problem fixed: Tilt Ram

Just follow shop manual

Mercury 2002 Optimax 200 HP

Repair Difficulty
Repair Time
More than 4 hours
Expectations always met. Delivery times have always been accurate.

Problem fixed: Hard starting as temperatures getting colder <68 deg F.

Boat: Boston Whaler 275 Conquest Power: twin, 2002 Mercury 200 HP Optimax (equipped with Smart Craft) Problem seemed to be a voltage drop to below operational minimum on port engine only. When cranking the engine in colder temperatures, the engine crank speed would decrease a little, but noticeably within 2 seconds. A jump box on the battery did not help. A jump box on the starter brought instant success. Once the engine warmed up, no problems with starting every time. It would take an overnight cool down to make the problem show up, which also made trouble shooting very hard. Started with the battery, a one year old, 750 CCA recommended in the manual (newer engines show 850 CCA). The battery checked out. Switched to dual battery start with no positive impact. Checked battery terminals. The batteries wire to buss terminals, then to the engines. (Multiple battery switches and busses). Found a little corrosion on one positive terminal and replaced. No change in condition. Ran a resistance check from starter wire termination points (+) and (-) on both engines to the battery leads (disconnected from batteries)and they were near identical. But just for the heck of it, I purchased a 1150 CCA battery to see if that would help. It did not. Called Mercury dealer to send in their tech support. He threw is computer at it and found no errors or anything wrong. He was convinced it was something between the batteries and the engine. After three visits he said he was at a loss. I was at a loss along with 3 other mechanically inclined friends. Luck set in with the other engine not starting at all one day (if you call that luck). It seemed obvious it was an ignition problem. Only three items comprise this ignition system; cpu, 6 coils, and the crankshaft position sensor. Long story short, it was the crankshaft sensor (I ran a resistance check on each engine’s sensor and found it to be defective. Note that when turning the engine over, the defective sensor still showed RPM reading). I switched out the one from the cold natured, hard starting port engine, and the starboard started right up. I left that sensor there and order/installed new sensor on the hard starting port engine. This is where luck continued. On the next cold day, the starboard engine displayed the same hard start issue as the port. Now the port engine with the new sensor, started right up. Only change to the starboard was the crankshaft sensor. Ordered a new sensor, installed, and problem went away. Moral to the story is that the trouble shooting theory on the crankshaft sensor showing RPMs when turning over indicates a good sensor, don’t believe it. Run a resistance check. This problem took 8 months to resolve because the problem did not exist above 70 degrees F. It was luck and having a twin engines to swap out parts that led to the fix.

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Due to manufacturer policy OEM Mercury products can only be shipped to addresses within the United States.