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Blower Base Gasket
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Mr. Gasket 674G Supercharger Blower Base Gasket List Price: $14.29 Sale Price: $9.26  |
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Supercharger Gasket 1/16 in. Thick GMC Base Gasket |
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Mr. Gasket 671G Supercharger Blower Base Gasket List Price: $18.69 Sale Price: $12.12 |
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Supercharger Gasket 1/32 in. Thick GMC Base Gasket |
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Weiand 90565 174 BLOWER BASE GASKET Sale Price: $17.04 |
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Weiand 90565 174 BLOWER BASE GASKET. |
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Float style carburetors are common on small engines used on gas powered outdoor equipment, in particular the lawn and garden tractor. Many times when the engine is running rough or is hunting badly (engine speed not constant) it is because the carburetor needs a good cleaning and service.
Preparation
Record the engine type and serial number then obtain the relevant carburetor kit, engine and filter gaskets. Prepare a clean work area, an area of NO SMOKING or NAKED FLAME (gasoline vapors ignite very easily). Basic tools required are set of wrenches (socket or open ended), needle nose pliers, can of carburetor cleaner, a container to clean parts and a container to store parts.
Carburetor Removal
Take a photograph or make a pencil sketch of the choke linkage, governor linkage and springs connected to the carburetor. This will save a great deal of heartache when you come to reassemble. Shut off fuel to carburetor before removing the fuel line to the carburetor. Some have a fuel shut off valve, if not clamp the rubber fuel hose with a G clamp, or drain into a clean container.
Remove the air filter, the carburetor fixing nuts (screws) and governor spring. Ease the carburetor away from the engine, twisting as you do so to disengage the Z shape linkages to the choke and throttle valves. Note that there will be fuel still in the bowl at the base of the carburetor. Tip carburetor upside down to let the fuel drain out into a container.
Carburetor Disassembly
Now that you have the complete carburetor in your hand and before attempting to take it apart, look for the two screw (some have only one) with springs under the screw head. These will be the idle and high speed adjustment screw. Count the number of turns required to screw home the needle, about one & one and a half for the main jet and 1 time for the idle jet. Make a note as this will be the setting will to be used later.
Remove the high speed and idle adjusting screw, clean and place in a container ready for reassembling. Remove the bowl fixing nut, on some carburetors this nut is where the high speed adjustment screw is located. Clean the nut and replace washer if required. Those that house the high speed needle will have one or two small fuel transfer holes. These do get clogged - clean out with thin wire (obtain thin floral arranging wire from a craft shop). The float is next, watch out for the fuel inlet needle and how it is attached to the float hinge. Some of the brass floats do leak after a time, check by shaking float to hear if fuel is sloshing about, if so replace the float.
Use carburetor cleaner and spray outside, then the inside of the carburetor, the air and needle orifices. WATCH YOUR EYES - USE GOGGLES. Ensure that the choke and butterfly valves move freely and that the throttle and choke return springs are closing the valves.
If they are weak or broken then replace them by unscrewing the butterfly valve and removing spindle, then reassemble with new springs. Inside the venturi at the throttle valve end, there are 2 or 3 small holes (need to move the valve to open position to see them). I use a staple with one leg bent straight and using needle pliers cleaned out those ports. DO NOT FORCE IF STAPLE IS LARGER IN DIAMETER THAN THE PORT DIAMETER.
Reassemble
Insert fuel needle and float. Fit the bowl to the carburetor with a new 'O' ring. Screw in the high speed and idle needles (don't forget the tension springs, 'O' ring and washer) until they just seat, then back off the screws by the number of turns you recorded when disassembling. These settings should enable the engine to start, if not, screw both needles back in until they just seat. Back off the idle screw one turn and the high speed by 1&1/2 turns. Final needle adjustment is done when the engine tests are conducted.
Using the photos taken or your sketch, insert the governor and choke linkage, then with a new gasket fit the carburetor to the engine body. Reconnect the governor spring into the hole on the throttle cam, usually the same hole as the governor linkage. Reconnect fuel line and filter cover (with new gasket) to the body of the carburetor. Replace worn or dirty air filters
Adjustment
Start engine and allow it to warm up to normal operating temperature (3-5 minutes). Set the throttle control to the maximum speed position, then turn the high speed mixture control in (clockwise) slowly until the engine runs erratic. Note that screw position. Now back off the screw (counter clockwise) until the engine again begins to run erratic. Note that screw position, then screw back in to the mid position at which point the engine should be running smoothly.
Set the throttle control to idle or slow position and adjust the idle mixture screw in the same manner as you did with the high speed mixture control. Some times after setting the idle screw you may need to go back and readjust the high speed setting.
Disclaimer - This article is intended as a guide and is generic and therefore I cannot be held liable for injury or damage. There are many types of carburetors used on small engines, each with their own means of controlling the fuel/air mixture to the engine. However the above is typical of many carburetors used on small engines that I've serviced and repaired during the years I owned an outdoor power equipment sales and service business.
Brian Wenham, Briggs & Stratton Master Service Technician
Brian Wenham is a father and grandfather enjoying learning new skills online. I am semi-retired and for several years now have been an independent consultant selling walk-in bathtubs so I am familiar with in-home sales. Brian's career as a project engineer in the flight simulator industry allowed us to travel the world. For a number of years Brian owned an outdoor Power Equipment Sales and Service Dealership. Brian is a Briggs & Stratton Master Service Technician and a Outdoor Power Equipment Certified Technician. A year ago we moved to Maryland after 20 years in upstate NY. Now we're taking up the challenge of learning about online retail, it's a steep learning curve but thanks to all the great ezine articles and other sources of information we're gradually getting a handle on some of it.
We believe that to be successful in life and business you have to be honest and respectful, to give others the same consideration we always hope to get back. We've been fortunate in life so it gives us pleasure to share some of what we've learned with others. We welcome comments and constructive criticism so please come give us a visit at http://digitalcamerainformation.net for digital cameras or http://smallengineservice.wordpress.com for other information on servicing outdoor power equipment.
Development of Zero Emission Blowers for Sulfur Recovery
NISCO Fan Co. now offers gas-tight and zero leakage steam-jacketed blowers for Sulfur Recovery in Chemical Industry.
Hydrogen Sulfide H2S is a main source of sulfur. In high concentrations it can be lethal. It occurs in natural gas, oil, volcanic emissions, and some mineral springs. In oil rfining processes its presence is undesirable, and it must be removed. The Clause process is one of the methods used to remove the hydrogene sulphide, and while doing so, recover elementary sulfur.
In pactice this sulfur removal process requires a gas-tight, zero leakage, high temperature and high pressure blower for intermittent duty that must handle toxic gases and must be capable of being brought on line immediately upon demand. To do this the following features on the blower must be provided:
- Double welded casing construction;
- Steam flows between the housing walls to maintain a constant 285 F gas temperature inside the fan (because below 285 F sulfur will change from a gaseous to a solid state and will "freeze" to the blower surfaces causing damage or destruction);
- A mechanical shaft seal with heat tracing and purge by air or nitrogen;
- To assure tight tolerances between the shaft and shaft seal, the housing should be supported at the centerline, and grows concentric to the fan shaft when exposed to heat.: since this support isolates housing from the drive and mounting bases, housing thermal growth doesn't cause forces to be applied to these bases.
- To prevent the shaft from taking a permanent set when the blower is idle but still exposed to the high temperature, a turning gear is provided to keep the blower rotating at a very slow speed of 25 - 40 RPM; alternatively a VFD speed control can be used
Steam jacketed construction can also be used in other thermally critical chemical processes. As to air-tifgt and zero-emission construction, it is used in the following industries:
* Pollution Control
* Pulp and Paper Industry
* Printing and Converting
* Chemical Plants
* Power Generation
* Research and Development
* Petroleum
* Food Processing
* Paint and Ink Industries
for containment of hazardous organic and inorganic compounds in industrial process plants and other critical applications. Special construction and shaft sealing devices are available for blower service requiring zero or minimal gas leakage into and out of casing.
NISCO Fan Co. has a lot of experince with gas-tight and zero-leakage construction on fans and blowers, including: multistage lip shaft seals; Buna-N, Viton and Teflon seals; mechanical shaft seals; special fan housing gasketings; single and double carbon ring seals; hermetically sealed blowers; magnetofluidic and ferrofluidic seals; and packed stuffing boxes with barrier liquids and purgeable seals.
Specific code welding processes and special fan design features are used too - to ensure complete gas tight integrity.
Some special materials and alloys frequently used in gas tight fans, especially for service in hazardous, abrasive, corrosive and high temperature environments, include:
Corten, ASTM A36 Carbon Steel, Hastelloy, Inconel, Stainless Steels of different kinds, Titanium, Monel, Aluminum, Teflon, Rubber Lining. These materials are typical for industrial applications requiring high strength alloys and super alloys too.
NISCO Fan Co. is a world wide distributor of industrial process ans OEM fans and blowers, as well as fan components; including high pressure blowers, high temperature fans, spark resistant and explosion proof ventilators, tubeaxial and vaneaxial high pressure ventilators. NISCO also does existing fans and blowers repairs, re-build, as well as dynamical wheels balancing.
For additional information please refer to http://www.nisco.net/fanblower.html.
Oleg Tchechel
Designer of Industrial Process Ventilation Machinery
NISCO Fan Co.
http://www.nisco.net/news.html
http://www.nisco.net/aircurtain.html
About the Author
Oleg Tchechel
Developer of Industrial Ventilation Equipment
NISCO Fan Co.
http://www.nisco.net/custserv.html
http://www.nisco.net/inquiry.html
2000 Ford Focus from North America - Comments
My daughter has a 2000 Ford Focus, just had the ignition switch fixed for the 2nd time in less than two years. Brakes replaced 3 times, 3 sets of tires replaced, leaking on passenger floorboard and cannot find the leak and now the airbag light has come on.
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