vacuum amplifier repair - Ford Truck Enthusiasts Forums



1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

vacuum amplifier repair

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 12-11-2010, 08:56 PM
zaaac zaaac is offline
Senior User
Thread Starter
 
Join Date: Dec 2008
Posts: 226
zaaac is starting off with a positive reputation.
vacuum amplifier repair

I'm working on getting my egr operational in hopes of better fuel economy. All components were in working order except the amplifier. One of the diaphragm's was ripped so I picked up a second one and it had the same problem. I'm thinking this must be a common problem so figured I would try and fix them. I'm sure I could get the egr working without it but think it'll be better with the amplifier.

Here is the vacuum amplifier.



Here is the problem. The black diaphragm is ripped right off the little brass orifice. It should be pressed underneath therefore sealing up both sides separately.



I'm gonna patch it and re-press it under the orifice. You can drive out the orifice with a small nail or punch. Doesn't take much to pop it out.



One small tap and it's out. You can see the part of the diaphragm that was pressed underneath.



Next rough up the diaphragm where the patch will be glued on. I used 180 grit emery cloth.



Then apply rubber cement and let dry. Only takes a couple minutes to dry.



Press on patch.



Back side.



Poke hole in center with a nail.



Push orifice through diaphragm and trim rubber away so it wont fold up under the orifice when you press it back together.



Ready to be pressed back together.



Light tap with the hammer and it's pressed in.



Ready to be screwed together.



Check to make sure it holds vacuum.



Two vacuum amplifier's ready for service.





I hope this will help someone get their egr working like it should. Tomorrow I should have it hooked up, carb leaned out and timing re-curved. I will let you know how I make out.
Reply With Quote
  #2  
Old 12-11-2010, 09:23 PM
fmc400's Avatar
fmc400 fmc400 is offline
MSEE
 
Join Date: Apr 2004
Location: Austin, TX
Posts: 10,386
fmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud offmc400 has much to be proud of
Thanks for sharing this. Reps sent.
Reply With Quote
  #3  
Old 12-11-2010, 10:53 PM
ctubutis's Avatar
ctubutis ctubutis is offline
Moderator
 
Join Date: Nov 2007
Location: Denver Metro Area, CO
Posts: 19,676
ctubutis has a superb reputationctubutis has a superb reputationctubutis has a superb reputationctubutis has a superb reputationctubutis has a superb reputationctubutis has a superb reputationctubutis has a superb reputationctubutis has a superb reputationctubutis has a superb reputationctubutis has a superb reputationctubutis has a superb reputation
Ditto, that's a great write-up!
Reply With Quote
  #4  
Old 12-11-2010, 11:26 PM
Bullitt390's Avatar
Bullitt390 Bullitt390 is offline
Certified Thread Hijacker
 
Join Date: Aug 2001
Posts: 13,872
Bullitt390 has a brilliant futureBullitt390 has a brilliant futureBullitt390 has a brilliant futureBullitt390 has a brilliant futureBullitt390 has a brilliant futureBullitt390 has a brilliant futureBullitt390 has a brilliant futureBullitt390 has a brilliant futureBullitt390 has a brilliant futureBullitt390 has a brilliant futureBullitt390 has a brilliant future
Nice!

Josh
Reply With Quote
  #5  
Old 12-12-2010, 12:05 PM
jagabom jagabom is offline
Senior User
 
Join Date: Sep 2001
Posts: 304
jagabom is starting off with a positive reputation.
Excellent work zaaac. This should be kept somewhere on the site. How did you know the vacuum amplifer was toast?
Jim
77 F150 - 400 CI
Reply With Quote
  #6  
Old 12-12-2010, 01:21 PM
zaaac zaaac is offline
Senior User
Thread Starter
 
Join Date: Dec 2008
Posts: 226
zaaac is starting off with a positive reputation.
Port S and V should not commingle. If they do the diaphragm has a hole in it. All you need to do is blow in one of the ports and air shouldn't come out the other port. If the diaphragm is ripped it wont be able to open the valve and allow vacuum to pass through port R and O on the opposite side of the amplifier and then to the egr valve. When vacuum from the spark port on the carb is greater than vacuum from the venturi port on the carb the amplifier valve is opened allowing vacuum to the egr. Also between the amplifier and egr is a load control valve. It dumps the vacuum to the egr when venturi vacuum is present. I'm assuming all this complicated stuff is supposed to close the egr valve during idle and full power. I've been studying this for the past week but still don't have a complete grasp on it. Time to go to the shop and hook up vacuum lines. Wish me luck. Here is the diagram I'm gonna follow and a picture of the load control valve with amplifier.




Reply With Quote
  #7  
Old 12-12-2010, 04:31 PM
Nathan Plemons Nathan Plemons is offline
Elder User
 
Join Date: Aug 2004
Posts: 796
Nathan Plemons is gaining momentum as a positive member of FTE.
Excellent write up. I would be curious to see how it affects your mileage. My EGR doesn't do squat as the plate is damaged and clogged up and so too does the intake seem to be. I really didn't care but if it could actually improve the mileage I might look into it.
Reply With Quote
  #8  
Old 12-12-2010, 06:52 PM
zaaac zaaac is offline
Senior User
Thread Starter
 
Join Date: Dec 2008
Posts: 226
zaaac is starting off with a positive reputation.
Everything's hooked up and egr is working. Bumped timing up to 10° from 6° and no pinging. Use to ping with anything over 6°. Tried hooking up the vacuum advance and it started pinging. I can't figure that one out. It has a 26° reluctor so I should have 36° total. I don't have a tach but revved it pretty good and it only went up to 20°. Might try some weaker springs. Pulled out a spark plug and it was black(dry). I had 59 jets and dropped them down to 51. Now it misses on acceleration so will put in some 57's. Probably will still be rich so need to find some 53-55 jets. What do you guys have in your carb? Not sure how to check power valve vacuum but doesn't seem like it is leaking. I have 3 of them but not one has a color code on it. I'm sure I will improve my fuel mileage but now have done so much I will never know how much the egr helped. I guess it all works together though.
Reply With Quote
  #9  
Old 11-23-2013, 10:09 PM
TexinCali's Avatar
TexinCali TexinCali is offline
Senior User
 
Join Date: Apr 2012
Location: San Diego, CA
Posts: 335
TexinCali is starting off with a positive reputation.
I know this is an old thread but I had to send reps! What a great write up, worked like a champ. I would not even have know there was a diaphram in this thing and mine was ripped exactly as shown!

Don't even know if the original poster is still around if so NICE JOB!
Reply With Quote
  #10  
Old 03-22-2014, 11:59 PM
lbcarguy lbcarguy is offline
Junior User
 
Join Date: Apr 2012
Location: Long Beach, CA
Posts: 73
lbcarguy is starting off with a positive reputation.
Vacuum Amplifier

Thanks so much for this post. I repaired my amplifier today. It failed exactly the same.

Mike
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
4" BDS, 18x9 Monster 778's installed (PICS) mankypro Excursion - King of SUVs 45 12-28-2013 10:11 PM
Bigern's 1970 2wd Restoration WIP bigern26 1967 - 1972 F-100 & Larger F-Series Trucks 30 07-27-2011 10:45 PM
painting my roof white... KrautBurner Paint & Bodywork 5 04-28-2011 07:29 PM
Parts Truck 78 F250 4x4 in WI Deluxetruck 1973 - 1979 F-100 & Larger F-Series Trucks 35 03-16-2011 11:40 AM
f650 dash in a manual shift 4X4 it can be done! dirty1 1999 - 2003 7.3L Power Stroke Diesel 7 08-29-2009 12:02 PM


Go Back   Ford Truck Enthusiasts Forums >

Tags
1977, amplifier, bass, e150, econoline, egr, f150, ford, guitar, purpose, rebuild, repairing, tube, vacuum, venturi, volume

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -5. The time now is 07:04 AM.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.