bobkiksass
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- May 31, 2012
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bobkiksass
I have cessna 150, its a 1976 with a penn yann 0200 thats 10 yrs old w/ 300 hrs. About a month ago, a few times while flying the plane would randomly start vibrating and would loose a small amount of power when at wide open. Had this happen like 3 times, described situation to mechanic. We checked compression, all 78+ pulled plugs, everything seemed fine. He advised me that my prop needed to be overhauled, because it was rough and never had been done, I thought it was a good call. The mags also had a service bulletin, and had not been gone over 10 yrs so he thought we should have them overhauled.
I proceeded with the work on the prop, and mags. Got the plane back a few days ago, looking great, and sounding like it was "hitting" a lot better. Sounded smoother, he described that the mags were rough on the inside and this would make a big difference.
So I went to fly the plane, run up is great.... prop feels smoother, and the mag drop is hardly noticeable, much improved. I go to takeoff, give it wide open and only get 2400 rpm. I kinda climb like 20 ft, but realize this isnt right, so I put it back on the runway without going around.
Go to my mechanic, he suggests we try static power run, so we give it wide open now 2600-2650 rpm, way more power noticeably then when I just tried to takeoff. Im thinking how is this possible?
We pull the cowling, inspect everything. On the MA3SPA carb the throttle shaft was a bit sloppy from side to side when wide open. And a small amount of fuel could be seen leaking through the bushings on the sides of it when cycling the throttle. The shaft that activates the accelerator pump also had a considerable amount of slop. He seemed to think air could be leaking through the carb and was an issue. He was unsure if it explained the lack of full power on my attempted takeoff. He offered to let me remove the carb myself and so I did. He is going to send it to be inspected and repaired as necessary. It is one piece venturi ma3spa
I am hoping that it was the carb that caused this unexplained lack of power. It seems like everything else has been gone through. Only other thing Im thinking is to verify the induction system isnt leaking anywhere.
any insight on my 150 ?
I proceeded with the work on the prop, and mags. Got the plane back a few days ago, looking great, and sounding like it was "hitting" a lot better. Sounded smoother, he described that the mags were rough on the inside and this would make a big difference.
So I went to fly the plane, run up is great.... prop feels smoother, and the mag drop is hardly noticeable, much improved. I go to takeoff, give it wide open and only get 2400 rpm. I kinda climb like 20 ft, but realize this isnt right, so I put it back on the runway without going around.
Go to my mechanic, he suggests we try static power run, so we give it wide open now 2600-2650 rpm, way more power noticeably then when I just tried to takeoff. Im thinking how is this possible?
We pull the cowling, inspect everything. On the MA3SPA carb the throttle shaft was a bit sloppy from side to side when wide open. And a small amount of fuel could be seen leaking through the bushings on the sides of it when cycling the throttle. The shaft that activates the accelerator pump also had a considerable amount of slop. He seemed to think air could be leaking through the carb and was an issue. He was unsure if it explained the lack of full power on my attempted takeoff. He offered to let me remove the carb myself and so I did. He is going to send it to be inspected and repaired as necessary. It is one piece venturi ma3spa
I am hoping that it was the carb that caused this unexplained lack of power. It seems like everything else has been gone through. Only other thing Im thinking is to verify the induction system isnt leaking anywhere.
any insight on my 150 ?
