gonup
Saw Builder
Posts: 132
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Post by gonup on Apr 25, 2020 17:16:58 GMT -5
I was getting ready to start my super 1050 that I have been repairing over the winter but when I tried to pressurize my carburetor it came right out the hole in the top cover. I removed the cover and I think I may be missing a gasket.
I only found 1 photo online and that was for a model 74-A. The vent hole in the cover is directly over the fuel inlet.
Here is all that came apart. All help appreciated
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Post by edju1958 on Apr 25, 2020 17:38:07 GMT -5
You have the gasket,but you're missing the pump diaphragm(s).What model Walbro carb is on the 1050?
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Post by 5terrysupersaws on Apr 25, 2020 17:49:14 GMT -5
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gonup
Saw Builder
Posts: 132
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Post by gonup on Apr 25, 2020 17:52:49 GMT -5
I think it is SDC model 74. I found 1 of Leon's videos but he didn't disassemble this side.
What is the part that is still on the carburetor? Thanks guys |
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Post by ken8831200 on Apr 25, 2020 18:26:06 GMT -5
I think it is SDC model 74. I found 1 of Leon's videos but he didn't disassemble this side.
What is the part that is still on the carburetor? Thanks guys Well I'm far from a Walbro expert but I'm thinking the diaphragm would be on the other side of the carb. The side shown is the side with the check valves, that is what the brown plastic piece still on the carb body would be. Just for general information here is a video from Walbro that explains a lot about carbs: youtu.be/cDaOcNrS6BM |
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Post by 5terrysupersaws on Apr 25, 2020 18:28:24 GMT -5
I think it is SDC model 74. I found 1 of Leon's videos but he didn't disassemble this side.
What is the part that is still on the carburetor? Thanks guys The part remaining on the carburetor is a 'check valve diaphragm', believe it's not used on this model of carb. Remove it and install a 'fuel pump diaphragm' , some kits contain both to cover various SDC carb. applications. The part# 64233, is from Super 1050 IPL:24685, model SDC-74 carburetor. |
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gonup
Saw Builder
Posts: 132
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Post by gonup on Apr 26, 2020 9:04:08 GMT -5
Found a great resource here at Walbro.com.
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Post by fossil on Apr 26, 2020 12:08:44 GMT -5
I was getting ready to start my super 1050 that I have been repairing over the winter but when I tried to pressurize my carburetor it came right out the hole in the top cover. I removed the cover and I think I may be missing a gasket.
I only found 1 photo online and that was for a model 74-A. The vent hole in the cover is directly over the fuel inlet.
Here is all that came apart. All help appreciated
The carb on a Super 1050 is the SDC-74. That carb does take both the check valve diaphragm and the pump diaphragm and the thicker pump side gasket. The pump diaphragm (no 3/4" hole in it) goes against the carb body, next is the check valve diaphragm (3/4" hole in it) and then the thick gasket (92-108) under the cover. Here's a link to the Walbro site which will tell what PN's the carb uses. Any blank spaces means the part is not used in that particular model. The diagram in the link shows the order of the parts and PN's involved. walbro.force.com/parts/comm_partsservicedetails?partId=a0Fo000000V5CF5EANThe part that is sitting on the body of the carb in your pic is a check valve diaphragm. |
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gonup
Saw Builder
Posts: 132
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Post by gonup on May 3, 2020 10:07:59 GMT -5
Thanks for the help everyone. it's back together and it holds pressure.
Any chance I could get some advice on my wrist pin thrust washer post..
What is acceptable thrust washer clearance to get enough oil to the bearings?
Wes
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gonup
Saw Builder
Posts: 132
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Post by gonup on May 17, 2020 9:50:44 GMT -5
Thanks to all. It's a good thing my carb didn't work or I may not have caught the wrist pin issue which has also been corrected. When I started the saw it must have run at about 3000 rpm and scared the poop out of me. I was sure I did something wrong in the carb. Got it shut down after just a few seconds. Backed
off the idle speed control and restarted and much better.
Wes
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Post by sweepleader on May 17, 2020 10:03:47 GMT -5
That high speed start is something that often happens when a saw has not been running right before repairs. The carb is adjusted to keep the saw running with a high idle setting which is
not backed off before restarting.
If the moving parts are lubed during assembly, there is no need to worry. No time is needed to build oil pressure like in a 4 stroke so a timely correction is easily possible, that is, before damage results. Oiling begins as soon as fuel mix gets to the engine, which of course is before it actually starts.
Nice work.
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