Section 4 — Maintenance

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

4.8 ADJUSTING VALVE CLEARANCE

After the first 50 hours of operation, you should adjust the valve clearance in the engine.

Important: If you feel uncomfortable about doing this procedure or you don't have the proper tools, please contact your Generac Authorized dealer for service assistance. This is a very important step to insure longest life for your engine.

To adjust valve clearance:

•Make sure the engine is at room temperature.

•Make sure that the spark plug wire is removed from the spark plug and out of the way.

•Remove the four screws attaching the valve cover with a #2 or #3 phillips screwdriver.

•Make sure the piston is at Top Dead Center (TDC) of its compression stroke (both valves closed). To get the piston at TDC, remove the intake screen at the front of the engine to gain access to the flywheel nut. Use a large socket and socket wrench to rotate the nut and hence the engine. While watching the piston through the spark plug hole. The piston should move up and down. The piston is at TDC when it is up as high as it can go.

•Loosen the rocker jam nut. Use an 10mm allen wrench to turn the pivot ball stud while checking clearance between the rocker arm and the valve stem with a feeler gauge. Correct clearance is 0.002-0.004 inch (0.05-0.1 mm).

NOTE:

You must hold the rocker arm jam nut in place as you turn the pivot ball stud.

When valve clearance is correct, hold the pivot ball stud in place with the allen wrench and tighten the rocker arm jam nut. Tighten the jam nut to 174 in/lbs. torque. After tightening the jam nut, recheck valve clearance to make sure it did not change.

Figure 4.10 - Valve Clearance Adjustment

Rocker

Pivot BallArm

Stud

Jam Nut

Valve

Stem

•Install new valve cover gasket.

•Re-attach the valve cover. NOTE:

Start all four screws before tightening or you will not be able to get all the screws in place. Make sure the valve cover gasket is in place.

•Re-attach the spark plug wire to the spark plug.

•Repeat the process for the other cylinder.

4.9COOLING SYSTEM

Air inlet and outlet openings in the generator compart- ment must be open and unobstructed for continued proper operation. This includes such obstructions as high grass, weeds, brush, leaves and snow.

Without sufficient cooling and ventilating air flow, the engine/generator quickly overheats, which causes it to quickly shut down. (See Figure 4.9 for vent locations.)

Figure 4.9 – Cooling Vent Locations

The exhaust from this product gets extremely hot and remains hot after shutdown. High grass, weeds, brush, leaves, etc. must remain clear of the exhaust. Such materials may ignite and burn from the heat of the exhaust system.

The maximum ambient temperature for your

!generator is 48.9° C (104° F).

20

Page 21 Page 23
Page 22
Image 22
Generac Power Systems 04759-0, 04758-0, 04760-0 owner manual Adjusting Valve Clearance, Cooling System
Page 21 Page 23

04760-0, 04759-0, 04758-0 specifications

Generac Power Systems is a leading manufacturer in the field of power generation, known for its innovative products that cater to both residential and commercial customers. Among its prominent offerings, the Generac models 04758-0, 04759-0, and 04760-0 stand out as essential solutions for backup energy needs. These units offer reliable power during outages, ensuring that homes and businesses remain operational regardless of external conditions.

The Generac 04758-0 is a robust standby generator designed for residential use. Featuring a powerful engine, it delivers a dependable power output when it is needed most. Key characteristics include an automatic transfer switch that detects power loss and activates the generator without user intervention. This means that homeowners can enjoy peace of mind knowing that their essential appliances and systems will continue to function seamlessly during outages. Additionally, its compact design allows for easy installation in most home settings.

Moving on to the Generac 04759-0, this model offers even greater power capacity, making it suitable for larger homes or small businesses. It incorporates advanced technologies such as digital power management, which optimizes fuel efficiency and reduces emissions. The O47-59-0 is also known for its durable construction, providing reliable performance in various weather conditions. Its user-friendly interface allows for straightforward operation and monitoring, ensuring users remain informed about their power status.

The Generac 04760-0 takes it a step further by enhancing its overall performance with innovations in noise reduction and fuel consumption. It is engineered with a leading-edge cooling system that minimizes operational noise, making it ideal for residential neighborhoods where sound regulations are a concern. This model is also compatible with a variety of fuels, giving users flexibility based on availability and cost. Its comprehensive warranty further underscores Generac's commitment to customer satisfaction and product reliability.

In summary, the Generac Power Systems models 04758-0, 04759-0, and 04760-0 exemplify technology and engineering excellence in the power generation industry. With features designed for efficiency, durability, and user convenience, these models provide steadfast support to users seeking dependable backup power solutions. Whether for a home or small business, Generac's offerings remain a trusted choice for managing unexpected power outages.
Top Page Image Contents