OMC Parts / OMC Cobra Stern Drive Tech Drawings

OMC 400 / 800 / Stringer steering information

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OMC Stringer 400 / 800 upper gearcase worm gear sterring configuration help
When ordering an OMC 400 / 800 / Stringer upper unit, you must know what type of unit you have. There are 2 different upper gearcase worm gear sterring configurations!
 
  • Clockwise worm gear
  • Counter clockwise worm gear

It is essential to know which drive you have before ordering your upper gearcase.

If the wrong worm gear is installed on your boat, the steering will be reversed.

When turning the steering wheel clockwise (right), the boat will turn left, and when turning the steering wheel counter-clockwise (left), you will turn right.

Follow these easy steps to determine which type of drive you have:

OMC Intermediate Housing
L OMC intermediate housing.jpg
Remove the upper and lower gearcase from the intermediate housing. Standing behind the boat, looking toward the intermediate housing (as shown in figure 1). Locate the small spure steering gear to the right of the ball gear.
L OMC intermediate steering.jpg
Have someone turn the boat's steering wheel clockwise. If the steering gear (shown in photo with black stripe on gear) turns clockwise, you have a right hand worm gear.
OMC Steering Gear
L OMC Steering Gear.jpg
Again, turning the boat's steering wheel clockwise, check the rotation of the steering gear (shown in photo with black stripe on gear). If the steering gear rotates counter-clockwise, you have a left-hand worm gear.

Questions about OMC worm gear configurations in the upper gearcases, contact our tech department. Tech service is a free service provided by T.C. Electronics/Marine.
 
Tech Service
Monday - Friday 6pm - 8pm Eastern Standard Time
416 751-7326