Free johnson 70 hp outboard manual free download

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Johnson Evinrude Outboard Motor Service manuals - the easy way! Performing the scheduled maintenance is very important. It compensates for the initial wear that occurs during the life of the outboard motor. Most all Workshop manual chapters start with an assembly or system illustration, diagrams, exploded parts view, pictures, service information and troubleshooting for the section.

The subsequent pages give detailed procedures. Crankcase pulsating pressure created by the up-and-down movement of piston is transferred to fuel pump by way of a passage hole between crankcase and fuel pump. This vacuum also pulls in on the fuel pump diaphragm, thus the inlet check valve in fuel pump is opened and fuel from fuel tank is drawn into fuel pump. This motion also forces out on the fuel pump diaphragm, which, in turn, closes the inlet check valve to keep fuel from returning to fuel tank and opens the outlet check valve, thus forcing fuel to the carburetors.

If, after using a separate fuel supply, it is found that the anti-siphon valve is the cause of the problem, there are 2 solutions to the problem; either 1 remove the anti-siphon valve or 2 replace it with a solenoidoperated fuel shutoff valve. Testing Install clear fuel hose s between fuel pump and carburetor s. Run engine, and inspect fuel passing thru hose s for air bubbles. Fill tank with fuel. Loose fuel line connection. Check and tighten all connections.

Fuel pump fitting loose. Tighten fitting. A hole or cut in fuel line. Check condition of all fuel lines and replace any found to be bad. Fuel pump anchor screw s loose. Tighten all screws evenly and securely. Fuel pump gasket s worn out. Rebuild fuel pump.

Air in fuel line. A dirty or clogged fuel filter. Clean or replace fuel filter. The fuel pickup in fuel tank clogged or dirty. Clean or replace pickup. Worn out fuel pump diaphragm. Defective hole or crack check valve s in fuel pump unlikely. Broken check valve retainer. Pulse hole plugged. Remove fuel pump and clean out hole. Replace pulse hose. Loose pulse hose. Tighten connection. Boost diaphragm gasket distorted or out of place. Align or replace gasket if necessary.

Fuel Pump Components Design 1 NOTE: In fuel pump reassembly, remember that respective diaphragms go against the mating surfaces of the fuel pump body, and respective gaskets are between the diaphragms and end caps. Gaskets should always be replaced on fuel pump assembly.

Carburetion Fuel System Troubleshooting Troubles, that are caused by items 1-thru-5, listed below, may give the impression that a problem exists in the fuel system: 1. Spark plugs 2. Ignition spark voltage 3. Cylinder compression 4.

Covers all HP, 2-stroke Fuel Injected models. Evinrude Inline Engines Covers all inline engines, 1. You are invited to join our public Boat Repair Forum to seek assistance from other members. You may also visit the Boat Motor Manuals section of our site to obtain a service manual.

Aug 25, johnson evinrude service manual download. Johnson Evinrude Outboard Motor Service manuals are available for immediate download! If you have a dirty old paper copy of this manual or a PDF copy of this manual on your computer and it crashed we can help!