BCDD Rebuild Parts
Posted 15 April 2012 - 05:54 PM
the FSM says "NEVER take the BCDD apart"
Haha! Yeah I saw that too, but... So?
If they didn't want me to take it apart, they wouldn't have put screws on the bottom. LOL
Seriously though, I suspected as much. Most discussion I've seen on the BCDD is people talking about how they have disabled them, not repaired or replaced them. I just figured I would throw the question out there and see what stuck. Was thinking (hoping?) that maybe one of the aftermarket specialists might offer parts.
Posted 15 April 2012 - 06:11 PM
You may be able to refresh tears in the diaphragms with improvised patches.
3m spray adhesive and paper can patch a ripped up speaker so there should be some way to revive a BCDD.
The person who buys on price alone is this man's lawful prey.[/h][h=6]John Ruskin (1819 - 1900)[/h]
ZCars in Eastern Canada seaport ready for shipment to Europe
Posted 15 April 2012 - 06:59 PM
1978 Coupe - HLS30-440105
Spring, Texas USA
pro deo et patria
Posted 16 April 2012 - 04:45 AM
Problem is that I sincerely doubt that I'll be able to split the BCDD parts apart without completely ruining the diaphragms. In other words, I'm not past the point of no return yet and I didn't want to pass that point until I had a "plan".
Blue, this is your fault by the way... :laugh: It all started by looking into that goofy auxiliary throttle return spring that you pointed out to me and has spiraled out of control from there. I've been trying to figure out why that additional return spring was needed to get the throttle to return to idle and I've discovered a whole host of issues that are contributors. One of the fixes (so far) was to completely disassemble and clean the throttle body. With the exception of the BCDD or course.
Posted 16 April 2012 - 06:14 AM
Posted 16 April 2012 - 06:07 PM
But the summary is that I've discovered that my previous owner got overzealous with the bead blaster and sprayed things he should not have. Here's the host I've found so far:
Blasting grit in the throttle body and TPS making the throttle shaft movement grainy.
Blasting grit making all of the throttle linkage ball and socket joints sticky.
Blasting grit in the sleeve bearings where the throttle linkage mounts onto the intake manifold.
Blasting grit inside the plastic spherical bearing where the throttle linkage mounts to the firewall.
Not related to my throttle issues, but I found blasting grit inside my distributor as well.
So what made me start looking at the BCDD? To be honest, I don't have any performance reason to believe there's anything wrong with it, but with all the grit I've found elsewhere, it is impossible for me to believe that it didn't get inside the BCDD as well. But I don't want to open it up without replacement parts first.
If you open one, I'd love to see pics. I think I've got a pretty good idea of what's inside, but without opening one up, it's simply speculation.
I just hope he spared the AFM.....:sick:
Posted 16 April 2012 - 08:11 PM
Posted 17 April 2012 - 04:25 AM
Don't get me wrong about my PO. It's not like he blasted the inside of the throttle body. It's clear that he at least tried to keep the grit out of places it shouldn't go. Problem is that even if you're careful, grit sometimes gets where it shouldn't. So, it's not like I'm expecting to dump a spoonful of grit out from inside my BCDD, but it only takes one bead on the sealing surface of the valve inside to screw it up.
Do I think there's a spoonful in there? No.
Do I think there's a piece or two in there? Absolutely.
Posted 17 April 2012 - 07:19 PM
Current Z: 1978 280Z, mostly stock, with some electrical mods. Semi-daily driver.
First Z: a brilliant, gold, 1975 280Z for my daily commute.
Also in the fleet: '94 Miata, '92 Saturn SL2, and '09 Dodge Ram (token modern vehicle).
Posted 18 April 2012 - 03:57 AM
Wowza! Here I was admiring your sparkly clean engine. I had no idea how it got that way and what the implications were!
Yeah, no kidding. The implications, as I'm finding out, are deep running.
So not only am I finding blasting grit in places it shouldn't be, I've also realized that all of the original chromate plating has been blasted off the steel bits and has been replaced with paint. Looks great until the first time you wipe something with carb cleaner and take the paint off exposing the untreated steel beneath.
I would much rather deal with a little dirt, grease, oxidized aluminum, and old chromate. Even if it's starting to fail in spots. :cry:
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