Model #919167400 CRAFTSMAN Air compressor

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Question and Answers

Q:

air compressor repairs

A:

The only thing I can think of is if the valve plate assembly is allowing the air to come back when it shouldn't be. If the reeds on the valve plate or stuck open or damaged then this can happen. Also, if the plate is installed upside down, then I think that would happen. I'm not sure if the plate can go in upside down, but that symptom would make sense.

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Wade_B -
Sears Technician
September 03, 2013
A:

I don't believe the valve plate can be installed upside down, but I'll double check. It's new BTW. As far as setting TDC in relation to the eccentric, ,is that irellevant? The only unusual thing I noticed is that as the piston approaches BDC, it rocks slightly and the ring seal seems to be lost until the piston again begins to rise. I don't see how that would cause the reeds to malfunction, but that's why I wonder about piston "timing".

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Richard -
September 03, 2013
A:

I don't find any mention of the orientation of the eccentric on this model. I know on the twin cylinder models, it matters (a lot). I would think if it were of importance on a single cylinder, they would have made mention of it. I'll keep looking for more information and see though.

I found a video of this whole procedure being done. You may want to have a look at the video to make sure you didn't miss anything. Again, I'll keep looking to see if I can find anything else that may be of use to you for this.

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Wade_B -
Sears Technician
September 03, 2013
A:

Video is great. I'll go back over all my steps and let you know what I did wrong, if anything. Thanks much, Richard Benoit

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Richard -
September 04, 2013
A:

Thanks Wade, the video was great. If I had spent an extra 30 seconds during assembly, I would have realized I put the valve plate in backwards. Which side is up is obvious,but intake vs. exhaust takes a couple seconds to fiqure out. I should have known when it pumped air out instead of in. 5 Stars for you

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Richard -
September 07, 2013
A:

I'm glad you got this figured out. These things can be a bit confusing the first few times you deal with them. I clearly remember the first time I had to pull one down. I equate it to look at a foreign language book; you know it's a book and you know there are words, but you can't make much sense of them. lol.

Thank you for your rating, it's really appreciated.

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Wade_B -
Sears Technician
September 09, 2013
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