Some basic carb cleaning and rebuild info
Re: Some basic carb cleaning and rebuild info
Awesome! Thank you!
- dlb
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Re: Some basic carb cleaning and rebuild info
Larry, I searched online for Bendix Speedy Clean but couldn't find anything that matches that. Can you post a link to the stuff? I'm very interested.larry mcgrath wrote: ↑Sun Sep 27, 2015 10:20 am When you delve into the world of rebuilding carbs you need to INVEST in some Bendix Speedy Clean, cleaning carbs with spray carb cleaner is a real poor method to clean carb parts. speedy clean is an acid that does clean all the small orfices ---air passages--- this product is rather pricey, but WORKS, will remove paint, carbon from anything -------Will REMOVE SKIN FROM YOUR BODY ALSO---- if you rebuild carbs this product is manditory . Larry
Re: Some basic carb cleaning and rebuild info
Hey David,
Larry hasn’t been on the site in nearly six months unfortunately. I have used Berryman Chen Dip in the past and found it to work well. Again, if you’re “kitting” the carb, it tears down so that everything is available to spray, etc.
https://www.autozone.com/fuel-and-engin ... lsrc=aw.ds
Don’t forget the tools for cleaning/clearing the small holes, etc.
https://www.acehardware.com/departments ... lsrc=aw.ds
Chris
Larry hasn’t been on the site in nearly six months unfortunately. I have used Berryman Chen Dip in the past and found it to work well. Again, if you’re “kitting” the carb, it tears down so that everything is available to spray, etc.
https://www.autozone.com/fuel-and-engin ... lsrc=aw.ds
Don’t forget the tools for cleaning/clearing the small holes, etc.
https://www.acehardware.com/departments ... lsrc=aw.ds
Chris
Psalm 37:4 "Delight yourself in the Lord and he will give you the desires of your heart"
In remembrance of my friend ARCHINSTL:
T4WD augury?
"Oh, do not ask, 'What is it?' Let us go and make our visit."
T.S. Eliot - "The Love Song of J. Alfred Prufrock"
"Now and then we had a hope that, if we lived and were good, God would permit us to be pirates."
Mark Twain
In remembrance of my friend ARCHINSTL:
T4WD augury?
"Oh, do not ask, 'What is it?' Let us go and make our visit."
T.S. Eliot - "The Love Song of J. Alfred Prufrock"
"Now and then we had a hope that, if we lived and were good, God would permit us to be pirates."
Mark Twain
- dlb
- Highest Ranking Member
- Posts: 7331
- Joined: Mon Jul 06, 2009 9:03 pm
- My tercel:: '87 sr5, '83 dlx parts car
- Location: bc, canada
Re: Some basic carb cleaning and rebuild info
Nice, thanks Chris. I'll look into those.
I know Larry hasn't been on the site in a bit but I thought by quoting him he might get a notification and come check in. Your info is just as helpful though.
I know Larry hasn't been on the site in a bit but I thought by quoting him he might get a notification and come check in. Your info is just as helpful though.
Re: Some basic carb cleaning and rebuild info
The power valve/piston deserves close attention. The main source of fuel to the primary ventury is the primary main jet. Ideally, this jet supplies enough fuel at cruising speed for proper air/fuel mixture, with a little extra for correction by the EBCV air bleeds. As we squeeze the pedal, more fuel is required. This is where the power valve begins to open, making more fuel available to that same primary ventury.
Make sure the piston and it's bore are clean. Install the retaining washer with the curved portion hanging over into the float bowl side as pictured in the FSM... it should just catch the edge of the piston and allow it to sit flush with gasket side of the air horn. This is the "active" position of the power piston, where the piston rod contacts and opens the power valve below. High manifold vacuum during idle and cruising pulls the piston up against spring pressure - into the "inactve" position where the power valve below is closed. Pretty basic for the experienced, but critical wisdom for those new to carb tinkering. Here's something to think about. For awhile I've been having trouble with rough part throttle operation. I rebuilt the carb, looked for and corrected small vacuum leaks, verified vacuum line routing, and checked for leaky diaphragms. Every time I thought I found something, I would put it back together and have that same rough running experience. I finally hooked a meter to the oxygen sensor (new), and could see the lean condition. As I studied the carb circuit diagram, I kept thinking about the power valve. I opened the carb again and pulled out the piston and spring. Maybe the spring is tired out after 30 plus years of action? I carefully stretched the spring to help force the piston into the "active" position more often. When i put it back together, the difference was significant. The rough running was almost eliminated, and the oxgen sensor voltage finally showed better readings into the rich range as the throttle was opened under load. The next thing to try (if i can find it) is a new power piston spring, part number 21734.
Make sure the piston and it's bore are clean. Install the retaining washer with the curved portion hanging over into the float bowl side as pictured in the FSM... it should just catch the edge of the piston and allow it to sit flush with gasket side of the air horn. This is the "active" position of the power piston, where the piston rod contacts and opens the power valve below. High manifold vacuum during idle and cruising pulls the piston up against spring pressure - into the "inactve" position where the power valve below is closed. Pretty basic for the experienced, but critical wisdom for those new to carb tinkering. Here's something to think about. For awhile I've been having trouble with rough part throttle operation. I rebuilt the carb, looked for and corrected small vacuum leaks, verified vacuum line routing, and checked for leaky diaphragms. Every time I thought I found something, I would put it back together and have that same rough running experience. I finally hooked a meter to the oxygen sensor (new), and could see the lean condition. As I studied the carb circuit diagram, I kept thinking about the power valve. I opened the carb again and pulled out the piston and spring. Maybe the spring is tired out after 30 plus years of action? I carefully stretched the spring to help force the piston into the "active" position more often. When i put it back together, the difference was significant. The rough running was almost eliminated, and the oxgen sensor voltage finally showed better readings into the rich range as the throttle was opened under load. The next thing to try (if i can find it) is a new power piston spring, part number 21734.
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Re: Some basic carb cleaning and rebuild info
Thank you for sharing.
Chrid
Chrid
Psalm 37:4 "Delight yourself in the Lord and he will give you the desires of your heart"
In remembrance of my friend ARCHINSTL:
T4WD augury?
"Oh, do not ask, 'What is it?' Let us go and make our visit."
T.S. Eliot - "The Love Song of J. Alfred Prufrock"
"Now and then we had a hope that, if we lived and were good, God would permit us to be pirates."
Mark Twain
In remembrance of my friend ARCHINSTL:
T4WD augury?
"Oh, do not ask, 'What is it?' Let us go and make our visit."
T.S. Eliot - "The Love Song of J. Alfred Prufrock"
"Now and then we had a hope that, if we lived and were good, God would permit us to be pirates."
Mark Twain