This DIY repair and service manual by Seloc, covers Volvo Penta Single and Duo Prop gasoline models.
Book Excerpt: 1968-1991 Volvo Penta Stern Drive Repair Manual: Single and Duo Prop Gasoline Models ENGINE REMOVAL: GENERAL INFORMATION

Three methods are available for separating the engine from the Volvo Penta stern drive and removal from the boat. One method is to disconnect the stern drive and pull the power plant, leaving the bell housing connected to the engine. The second method is to remove the engine from the boat leaving the bell housing connected to the stern drive. This method is not an easy task because the bell housing is very difficult to separate from the engine while still mounted in the boat. Three bolts securing the bell housing to the engine are located down under the housing. These three bolts are extremely difficult to remove and install due to the small space between the housing and the engine and awkward position required to reach them from the bilge of the boat. These three bolts are pointed out in disassembling section when the bell housing is separated from the engine block. A third method is to "pull" only the upper gear housing, and then to remove the engine. This is by far the most popular and the procedures in this section follow this method. However, if the lower unit requires service, the entire stern drive may be removed by first driving out the hinge pins, and then removing related hardware to "pull" the stern drive.

TROUBLESHOOTING

EXCESSIVE FUEL CONSUMPTION Excessive fuel consumption can be the result of any one of three conditions, or a combination of all three.

1. Inefficient engine operation.
2. Faulty condition of the hull, including excessive marine growth.
3. Poor boating habits of the operator.

If the fuel consumption suddenly increases over what could be considered normal, then the cause can probably be attributed to the engine or boat and not the operator. Marine growth on the hull can have a very marked effect on boat performance. This is why sail boats always try to have a haul out as close to race time as possible. While you are checking the bottom take note of the propeller condition. A bent blade or other damage will definitely cause poor boat performance. If the hull and propeller are in good shape, then check the fuel system for a leak. Check the line between the fuel pump and the carburetor while the engine is running and the line between the fuel tank and the pump when the engine is not running. A leak between the tank and the pump many times will not appear when the engine is operating because the suction created by the pump sucking fuel will not allow the fuel to leak. Once the engine is turned off and the suction no longer exists, fuel may begin to leak.

ENGINES COVERED: Volvo Penta In-Line

• Pushrod engines - 4-cylinder: AQ105, 115, 130 Series (121 CID)
• Pushrod engines - 6-cylinder: AQ165, 170 Series (182 CID)
• Single Overhead Cam (OHC) engines: AQ120, 125, 131, 140, 145, 151 Series (130 and 141 CID)
• Double Overhead Cam (DOHC) engines: AQ171 Series (152 CID)

GMC V6

• AQ175, 205 Series and Model 431 (229 and 262 CID)

GMC V8

• AQ200, 211, 225, 231, 240, 255, 260, 271, 280, 290, 311, 740 Series (305, 307, 350 and 454 CID)

Ford V8

• AQ190. 240 Series (302 and 351 CID)

Subject: 1968, 1969, 1970, 1971, 1872, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991 Volvo Penta Stern Drive service, maintenance, repair. ISBN-10: 089330011X | ISBN-13: 9780893300111 | Seloc 3600