« previous next »
Pages: [1] 2   Go Down

Author Topic: Finding Vacuum Leaks  (Read 10359 times)

Offline DnStClr

  • Senior Member
  • ****
  • Posts: 1806
Finding Vacuum Leaks
« on: August 25, 2007, 11:54:30 am »
I was cruising on Hotrodders.com and found a bit of useful info for finding vac leaks. The 1st two methods have been mentioned here before, but I found the bottom info pretty good for guys rebuilding an engine.


http://crankshaftcoalition.com/wiki/How_to_Find_Vacuum_Leaks
Logged
Don
87 Chevy Silverado

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 19180
Re: Finding Vacuum Leaks
« Reply #1 on: August 25, 2007, 02:30:01 pm »
I just made a powerpoint on vacuum & pressure. If anyone is interested in it either pm me your email address or post it here. Lotsa good stuff in there including tools and techniques.
Logged
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline CHawk

  • Newbie
  • Posts: 31
Re: Finding Vacuum Leaks
« Reply #2 on: August 26, 2007, 07:04:39 am »
Vile,

Very interested to see your power point!

ywaf1999@msn.com

Thanks!
Logged
1985 K10 Silverado (305-gone!) SBC 400 / 700R4 - Almost Running!

Offline Captkaos

  • OWNER and Administrator
  • Administrator
  • Senior Member
  • *****
  • Posts: 18461
    • http://www.73-87chevytrucks.com
Re: Finding Vacuum Leaks
« Reply #3 on: August 26, 2007, 08:53:16 am »
Vile, you can upload it to this post if it isn't huge.
Logged

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 19180
Re: Finding Vacuum Leaks
« Reply #4 on: August 26, 2007, 09:49:56 am »
Chawk - sent.

I'd rather email it to anyone who wants it since I will be incorporating it into my curriculum once it's all said and done at which point it becomes copywrited material.
Logged
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline CHawk

  • Newbie
  • Posts: 31
Re: Finding Vacuum Leaks
« Reply #5 on: August 26, 2007, 06:12:03 pm »
Thanks Vile!  Haven't had a chance to check it out yet due to work...I'll check it out tomorrow.

Thanks again!

Chris
Logged
1985 K10 Silverado (305-gone!) SBC 400 / 700R4 - Almost Running!

Offline cochese

  • Newbie
  • Posts: 15
Re: Finding Vacuum Leaks
« Reply #6 on: September 09, 2007, 11:47:56 pm »
hello vile,
i would also like to see the powerpoint if it's still available. 

gavila77@gmail.com

thanks
Logged
1986 c-10
305 5.0 V-8

Offline Mr79C10

  • Registered Users
  • *
  • Posts: 115
  • My 79 C-10 Project
    • My 79 C10 Project
Re: Finding Vacuum Leaks
« Reply #7 on: September 23, 2007, 06:26:19 am »
Quote from: VileZambonie on August 25, 2007, 02:30:01 pm
I just made a powerpoint on vacuum & pressure. If anyone is interested in it either pm me your email address or post it here. Lotsa good stuff in there including tools and techniques.


Me too please.
  David@ProFastSupplyJAX.com

Much Thanks!
Logged
*79 C10 Short Box  ST8 6 bang'r
*Lowered w/ 3" Control arms, 2" Lower Coils  and 4" shackles and hangers W/ FLIP KIT  
*House of Friends

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 19180
Re: Finding Vacuum Leaks
« Reply #8 on: September 23, 2007, 07:42:05 pm »
sent
Logged
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline jays2w87

  • Newbie
  • Posts: 58
  • Bone stock..... Not for long!
Re: Finding Vacuum Leaks
« Reply #9 on: September 23, 2007, 08:14:21 pm »
yah, I'll take a copy if its not too much trouble.
Logged

Offline jays2w87

  • Newbie
  • Posts: 58
  • Bone stock..... Not for long!
Re: Finding Vacuum Leaks
« Reply #10 on: September 23, 2007, 08:14:53 pm »
oops
jay.tran@yahoo.com
Logged

Offline shpark2

  • Newbie
  • Posts: 27
Re: Finding Vacuum Leaks
« Reply #11 on: October 01, 2007, 12:35:21 pm »
Vile, if it is still available - I could use a copy too.  I'm having a -_- time with my idle/fast idle/choke setup, it would be nice to cross vacuum problems off my list of suspects.

pbess@telus.net
Logged

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 19180
Re: Finding Vacuum Leaks
« Reply #12 on: October 01, 2007, 02:03:49 pm »
With your idle problem 1st thing I would do is set your timing. Then play with the idle. Wait til it's cold and set up the fast idle and choke plate.
Logged
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline shpark2

  • Newbie
  • Posts: 27
Re: Finding Vacuum Leaks
« Reply #13 on: October 01, 2007, 02:30:43 pm »
Thanks for the file Vile!  I will definitely refer to it in the future.  I got my timing set to 4 BTC as per air cleaner label, assuming timing tab is in the right place.  My idle mix screws are 2+1/4 turns out, thing starts great cold, then dies almost as quickly without foot on the gas to prop it up.  After propping it up for 45-60 secs, it will idle itself. 
I have a dual delayed vacuum setup, as you probably assumed.  Two pots on the passenger side, one I think is secondary lockout of sorts, the other is choke pulloff?
I suspect choke assembly, when I stick my finger in choke blades to open it - with engine off - it stays open, even when I push throttle open after.  I have to push it back closed, and it doesn't seem to seal totally.  Same when I push down on idle cam behind choke pulloff pot/fast idle adjust screw, it stays where it was pushed - until I push down on rod/close choke valve by hand.

When the engine is off, choke valve should be spring loaded and seal off completely - as the secondary air valve is?
If I pull a vacuum on my choke pulloff, the fast idle adjustment should contact and open the choke valve slightly byway of the linkage?

I realize now I should have put this in a different topic.....
Logged

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 19180
Re: Finding Vacuum Leaks
« Reply #14 on: October 07, 2007, 03:20:11 pm »
Figured this pic might help some of you

Logged
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10
Pages: [1] 2   Go Up
« previous next »