Starting several months ago the exhaust blower makes a constant, steady racket. Local dealer says it is probably fan blades fouled with carbon (as it is in the exhaust stream) or maybe a bad bearing. Being a cheapskate I would like to try to fix it myself. Owners literature is long gone. Does anyone have experience with this problem, and know where I can get schematic and/or parts? If it is really just carbon I should only need gaskets.
I have a laser 72. Several years ago, it began making a racket sounded like the squirral cage fan was hitting something. The only way I found to fix the problem was to remove the blower assembly case and place a small, about 1" long, piece of rubber tubing between the bottom of the motor and the case. This pushed up slightly on the motor which releived the fan. Randy
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Re: Laser 72 exhaust blower noise
The combustion blower sucks in clean air so it has no place in the exhaust stream. hence no carbon build up. the blades of it look like a vacuum disk on a vacuum cleaner. if the fan was recently rebuilt, make sure of the placement of the bushings. if one is misplaced the fan will rub on its housing and make all kinds of racket.
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EE-8 is for a blower motor malfunction. It could be due to carbon build up on the exhaust fan blades. Remove the front cover of the heater. Now locate the blower. There is a black rubber boot that goes from the bottom of the heater to the blower. Remove that boot. Use your finger or a pencil or whatever to reach in the hole and turn the fan blades. You may here a crunching sound from the carbon breaking up. Turn it until it frees up. If it turned freely to start with, you probably need a new blower motor. If it was hard to turn and you free it up, you will probably be OK.Let me know what you find. I have a used blower for a Laser 72 that should work for your Laser 73.
EE 8 indicates a problem with the combustion blower. If the blower is running the problem is with the sensor. Make sure the wires for the sensor haven't come unplugged. If the sensor is bad, you will need a new blower. If it isn't running then the problem may be soot and carbon build up on the exhaust fan blade. You will have to remove the fresh air hose on the back of the heater or the rubber boot inside the heater to reach the fan blades. Use your finger or something to reach in and turn the fan blades. You may hear the sound of the carbon breaking loose. Turn it until it spins freely. Let me know if you need anything else.
EE 8 is for a blower motor problem. It could be the sensor that checks the blower speed or it could be the blower not running. If the blower is running, the sensor is bad and you will need a new blower. If it isn't running then you may be able to fix it. Sometimes on the Laser 73, soot and carbon will build up on the exhaust fan blades. Remove the fresh air hose, that is the rubber on the back, and look for the fan blades. If you can see them turn the heater on and see if they are turning. If not turn the heater off and try to turn them with your finger. If you hear a noise like something rubbing when you turn it or feel some resistance, keep turning it until the noise stops or it frees up. Now turn it on again and see if the fan runs. If you don't have anywhere local to get parts I can get them for you. You can contact me at email@example.com I may also have a used blower that will work.
Depending on how much the heater has been used, you may just have carbon/soot built up on the exhaust fan blades. This can be remedied by removing the blower assembly and cleaning the exhaust fan blades. They are the set on top. If could also be a bearing as you suggest but I would check the fan blades first. Let me know if this doesn't fix the problem.
you have something stuck in the squirrel cage of the blower motor.All you need to do is drop the glove box open and look where the cabin air filter is,remove the cabin air filter and reach down there and pull the stuff out;its usually a leaf or napkin.
No. Removing the ring probably won't significantly affect cooling, but the misalignment indicates either a missing or loose mounting screw or a bent or broken tab. The problem is more likely the fan mount; failure to properly repair the problem will invariably lead to additional, more severe problems later.
several months ago I worked on a friends blower same thing you did and still could not get the right rps pulling my hair out i started to take it apart again this time when I started it i noticed some fuel popping back out of the carb and just for the heck of it i turned it over a checked out the exhaust bam there it was the exhaust port was clogged with carbon i took a small screwdriver cleaned out that exhaust port and it was like new hope this is your problem to