Page 335 - REPOWER REFERENCE GUIDE (2020)

Steering Systems

Tube Ref No. Description Where Used Part No.
Loctite 567 PST Pipe
9 Sealant 90 degree fittings 92-809822
• Hydraulic hoses must be ordered separately through Mercury Precision Parts and Quicksilver Accessories. Refer to the
Diesel Parts and Accessories Guide for the part number of the appropriate length hoses to suit your application.
• Hose fittings at the helm must be tightened to the specified torque.

Description Nm lb‑in. lb‑ft
Hose fittings 15 132.8 –

! WARNING

Stress on hose fittings or kinks in the hoses can damage hydraulic steering components, leading to serious injury or death
due to loss of boat control. Extreme heat can lower the hoses' burst pressure or melt the hose. Route hydraulic hoses to
avoid kinks, heat sources, or stress on the hose fittings.
• Mark hoses for proper connection to the steering cylinder. Hose connected to the P connection on the helm must be
connected to the port connection on the steering cylinder. The S connection hose must be connected to the starboard
connection on the cylinder.
Steering Options for Repowering Early Manufactured Boats

MerCruiser engines manufactured prior to 1993 and equipped with power steering used a Saginaw steering actuator. Saginaw
actuators are no longer available. Current engines are equipped with components for the current production steering actuators.

Description Part Number
Steering actuator (see NOTE) 866200A01
NOTE: If power steering hoses don’t have quick‑disconnects, remove the fittings from the actuator and your hoses will fit.
To replace Saginaw actuators for engines manufactured prior to 1993 using existing steering components, use the following kit:
Description Part Number
Steering actuator kit (kit contains pressure and return hoses) 8M0063381
Another power steering option is Mercury's new power hydraulic steering system:

Description Part Number
Power assist compact hydraulic steering kit. Used with V6 4.3L, V8 5.0L, V8 5.7L, and V8 6.2L. 879273A01
Power assist compact hydraulic steering kit. Used with 3.0L MPI, V8 8.1L, and V8 8.2L. 879273A02
External Power Steering Cylinders

For boats capable of operating faster than 110 km/h (70 mph), external power steering cylinders are required. Refer to
Steering Recommendations.
Important Safety Information

Alpha One Increased Trim‑In Range Capability

The Alpha One trim cylinders provide the capability for an increased trim‑in range. A spacer can be removed from the trim
cylinders to increase the trim‑in range by approximately 1‑1/2 degrees. This will improve the acceleration on some boats by
forcing the bow down more quickly. If the spacers are to be removed, the boat must be water tested to ensure that the
increased trim‑in range does not cause any undesired boat handling characteristics (bow‑steer, chine‑walk, etc.) if the
sterndrive is trimmed in while the boat is operated at higher speeds. The boat should be tested under all conceivable load
conditions and maneuvers to ensure that the additional trim‑in does not pose a problem. The final decision and responsibility
for use of the additional trim‑in range is left up to the boat manufacturer.

90-8M0149179 eng NOVEMBER 2018 © 2019 Mercury Marine Page 9B-11