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Weber 32 36 Ball Bearing Mystery


tskoda

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During disassembly of the Weber 32 36 from my project 1973 2002, a ball bearing fell out once the top was off, and I cannot find where it went. I've looked at several excellent exploded diagrams online and don't see a ball bearing anywhere. I have found reference to a ball bearing in the accel pump here;

 

http://www.bmw2002faq.com/topic/71759-gaining-access-to-ball-bearing-in-3236-weber/

 

but where in there? If it's behind a plug, it shouldn't have fallen out. The car hasn't run for at least 5 years, and there is no telling who did what to the car in the past. Does it even belong in there?

 

I rebuilt the thing and put it back on the car without that bearing and it runs okay now but it hesitates on acceleration. so maybe it does belong in there. I would like to solve this mystery of the ball bearing while the car is still in the 'parked in the garage getting a thorough going over' phase...

 

Thanks

 

Tom

 

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@etsy thanks for the reply

 

I did a search, although the syntax was a bit different - I didn't use the '/' just a space. That's how I found the article I linked to. 

 

An open Internet search does have reveal some additional info, but nothing really pertinent.Mostly about the replacement ball bearing setup for the shafts.

 

I have done a bit more work on this, and the brass plug mentioned in the referenced link seems to be on the top edge of the body. Since the plug is still there, the BB didn't come from there.

 

Still puttering away...

 

Tom

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Weber uses ball bearings as one- way valves for the accel pump- also, isn't there one in the 'power valve' on the floor of the float chamber?

 

I forget- it's been a long time since I dug that far into a downdraft, but they'd be behind a brass plug, I think...

 

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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@Buckeye - that is a valuable link. Bookmarking that sucka

 

thanks

 

@TobyB

 

The power valve connects to the roof of the float chamber, and there is no place for a BB/check valve like that in evidence. there is a space over the pump delivery valve 

assembly - #82 here

 

http://www.carburetion.com/diags/3236DGVDiaginfo.asp

 

So I'm going to try that.

 

We shall see...

 

thanks

 

Tom

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The valve itself is in the floor- #21 in the diagram.  The diaphragm on the roof actuates it.

But I think it's a pintle, now that I look at the diagram, with a little dingus that sticks up out of

it so that when the diaphragm loses vacuum, the spring pushes the plunger down

and opens it. 

 

So I think that might be a red herring.

 

Or Mackerel...

 

Sorry,

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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I have no idea how the ball could have fallen out. Very likely somebody before you put it in the wrong place.

The ball serves as a check valve on the intake side of the accelerator pump and it is hidden below a brass plug on the top of the float chamber right above the accelerator pump.

Don't try to drill out the plug because it isn't a simple plug. Drill a short hole into it (about 3/16 long) and tap it for a 6-32 screw, then use the screw to pull the plug.

You will need a bottom-tap and a #36 drill bit.

post-35939-0-19676600-1439168226_thumb.j

Edited by allbim

No amount of skill or education will ever replace dumb luck
1971 2002 (much modified rocket),  1987 635CSI (beauty),  

2000 323i,  1996 Silverado Pickup (very useful)

Too many cars.

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@allbim;

 

That kind of is where I am right now  - the thing didn't belong in there in the first place. The accel pump plug is there and looks like it has remained original.

 

That being said though, I do notice there does appear to be a ball under #41 in your excellent thumbnail.

 

My guess is it was sitting on top of the assembly, not in it as illustrated. That would allow it to fall out.

 

None of the many diagrams I looked at showed a ball valve there, so back off with the top plate, and away we go...

 

Thanks

 

Tom

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Tom,

If you unscrew the delivery valve (#41) and shake it, you should be able to hear the ball rattle inside of it.  This ball (obviously) serves as the check valve on the output side of the accelerator pump.  If you remove #41 and everything else that rattles and then shake the carb up and down, you should be able to hear the other ball rattle inside its bore.

If you don't hear it, and before you try to pull out the plug, you should blow compressed air alternately into the accelerator pump intake hole at the bottom of the float bowl and into the intake hole inside the pump. Hopefully this will loosen the ball if it's stuck.

And while you're at it, to avoid a vacuum leak, make sure the mounting flange of the carb is flat.   

Good luck. 

Edited by allbim

No amount of skill or education will ever replace dumb luck
1971 2002 (much modified rocket),  1987 635CSI (beauty),  

2000 323i,  1996 Silverado Pickup (very useful)

Too many cars.

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@Allbim

 

That assembly was removed for cleaning, and there was definitely no ball in it. That solves the mystery, I think - it was in the wrong place from an earlier owner.

 

I'll get it sorted tonight. 

 

Thanks to all who responded.

 

Tom

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