the manual valve also acts as a bleeder valve just in case you have gotten air into the system this happened to me and i just used the valve to bleed the system and added a little fluid with the engine lowered. That varies with motors. Mercury T&Ts are self bleeding. You just raise and lower it several times. Trim Limit Switch Testing 1. Disconnect the trim limit switch bullet leads from the trim control harness inside the boat (see Figure 1or Figure 3). 2. Connect an ohmmeter to the switch bullet leads. Meter should show continuity with drive unit in down position. 3. Operate power trim and note meter reading. At about one-third trim travel, the Outboard power trim units use a 12 volt electric motor to drive a small hydraulic pump which pumps oil through a series of valves and cylinders to lift the outboard up and down. Outboard power trim units are items that commonly have problems. Access to the manual release valve is located on the side of the large clamp bracket that bolts to Owners Manuals. To easily access an Owner's Manual with consolidated information specific to your Mercury engine - agree to the terms and fill out the form below. To order a printed version of the Service Manual for your particular Mercury Outboard or MerCruiser Engine, click here . I recognize that the literature on this Mercury Marine Popular Products. Genuine Mercury Optimax / DFI 2-Cycle Outboard Oil 1 Gallon 92-858037K01 $48.00 $46.08. Genuine Mercury Premium Plus 2-Cycle Outboard Oil 1 Gallon 92-858027K01 (3 Pack) $133.20 $127.87. Genuine Mercury Premium 2-Cycle Outboard Oil 1 Gallon 92-858022K01 (2 Pack) $81.60 $78.34. Marine Mercury Power Trim Tilt Manual Release Valve O-ring 813442a 2 893929a01. 14.25. Improved New Trim Tilt Manual Release Valve Fits For Mercury Power 893929a01. 16.70. Power Tilt Trim Motor For Mercury Outboard 50 - 90 120 125hp 809885a1 New. 79.63. For Stainless Mercury Power Trim Tilt Manual Release Valve 813442a 2 893929a01. 19.99. Power Trim Tilt Manual Release Valve For Mercury - 813442a2 893929a01 18-6751. 13.99. Nib Mercury 135-150-175-200-225 Power Trim Tilt Cylinder End Cap 878239. 75.00. Mercury Mariner Outboard Power Trim Tilt Unit 115 Hp 1984-1988. Visit store Power Trim Tilt Manual Release Valve For Most Mercury 2 & 4 Stroke (Stainless) Condition: New Sale ends in: 06d 02h 24m Quantity: 5 available / 7 sold Price: US $19.25 Approximately C $25.02 US $21.39 save 10% Add to cart Add to Watch list Free shipping and returns Ships from United States Shipping: Free 4 day shipping Includes - (1) Power Trim Tilt Manual Release Valve; comes as shown in the first image; Fits/For: Most 2 & 4 stroke outboards with integral tilt and trim; Please be sure to check your part or model number to ensure this is the correct release valve for your unit. Also, please note this may replace multiple part numbers Mercury Outboard Manual Release Valve Mercury has the valve located on the right side of the engine bracket, (viewed as if you are driving the boat or standing behind the outboard motor). The manual release for Yamaha and Evinrude outboards is located on the left side, midway down the transom bracket. Manual Tilt Release Valve - Just In Case Mercury Marine Tilt Trim Manual Relief Release Valve 2006+ 1 & 3 Ram 893929A01 Condition: New Bulk savings: Buy 1 $8.88/ea Buy 2 Buy 3 $8.26/ea Quantity: 4 or more for $7.99/ea 6 avail