Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> How to check Webers for throttle shaft leaks?
Tdskip
post Jul 14 2019, 05:46 PM
Post #1


Advanced Member
****

Group: Members
Posts: 3,684
Joined: 1-December 17
From: soCal
Member No.: 21,666
Region Association: None
Hi guys - hope everyone’s had a good weekend so far.

I am about to rebuilt a set of Weber’s which will be a first for me. I’ve rebuild quite a few carb on the British cars I cut my teeth on, so am at least familiar with carbs in general.

With the British cars all you need to do is see if can wiggle the throttle shaft to see if you have any play, if you do they need to be addressed.

Is there a similar test on the Weber’s I should be checking - I assume so.

False air is no fun.

Thanks!
User is online!Profile CardPM
Go to the top of the page
+Quote Post
IronHillRestorations
post Jul 14 2019, 06:28 PM
Post #2


I. I. R. C.
*****

Group: Members
Posts: 6,714
Joined: 18-March 03
From: West TN
Member No.: 439
Region Association: None
I don't know how to bench test, but on a running car you can spray carb cleaner and if it runs worse you've got leakage. You can also glob bearing grease on the suspect leak, and if it runs richer, you also have leakage.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Tdskip
post Jul 14 2019, 06:41 PM
Post #3


Advanced Member
****

Group: Members
Posts: 3,684
Joined: 1-December 17
From: soCal
Member No.: 21,666
Region Association: None
QUOTE(IronHillRestorations @ Jul 14 2019, 07:28 PM) *

I don't know how to bench test, but on a running car you can spray carb cleaner and if it runs worse you've got leakage. You can also glob bearing grease on the suspect leak, and if it runs richer, you also have leakage.


Hi Perry! Thanks for the response.

Pulling then back off wouldn’t be the end of the world, and will keep those tests in mind, but was hoping to find a way to check beforehand. I have two spare sets so can pick the better of the two if there is a difference.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Minerva's 914
post Jul 14 2019, 07:53 PM
Post #4


Member
**

Group: Members
Posts: 378
Joined: 24-December 15
From: Chapel Hill, NC
Member No.: 19,489
Region Association: South East States
QUOTE(IronHillRestorations @ Jul 14 2019, 08:28 PM) *

I don't know how to bench test, but on a running car you can spray carb cleaner and if it runs worse you've got leakage. You can also glob bearing grease on the suspect leak, and if it runs richer, you also have leakage.


(IMG:style_emoticons/default/agree.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ValcoOscar
post Jul 14 2019, 08:22 PM
Post #5


Garage Life
****

Group: Members
Posts: 2,374
Joined: 19-November 13
From: SoCal
Member No.: 16,669
Region Association: Southern California
QUOTE(IronHillRestorations @ Jul 14 2019, 05:28 PM) *

I don't know how to bench test, but on a running car you can spray carb cleaner and if it runs worse you've got leakage. You can also glob bearing grease on the suspect leak, and if it runs richer, you also have leakage.


Hey guys...

Great question and answer.

One to remember.

(IMG:style_emoticons/default/beerchug.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914Toy
post Jul 14 2019, 09:09 PM
Post #6


Senior Member
***

Group: Members
Posts: 716
Joined: 12-November 17
From: Laguna beach
Member No.: 21,596
Region Association: Southern California
In my case I could “jiggle” the shafts up and down on my triple throat Weber 40’s - was obvious the shafts were leaking air. Having them repaired made a huge difference to the engine performance both in smoothness at all rpm’s and power.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
porschetub
post Jul 15 2019, 12:11 AM
Post #7


Advanced Member
****

Group: Members
Posts: 4,697
Joined: 25-July 15
From: New Zealand
Member No.: 18,995
Region Association: None
Cost out getting the throttle shaft bushes redone,its a specialist job and is normally expensive...not DIY by any means,it's an involved process requiring special jigs and reamers.
The repair work is the big cost ,just don't get the cheapest price because you won't get what you really need.
Folks doing this are thinning out I understand legend Paul Abbot is scaling back on new work these days I guess he may be retiring ?
Parts Klassic (?) do them from memory and think there are a few others,good luck.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
914Toy
post Jul 15 2019, 09:08 AM
Post #8


Senior Member
***

Group: Members
Posts: 716
Joined: 12-November 17
From: Laguna beach
Member No.: 21,596
Region Association: Southern California
QUOTE(porschetub @ Jul 14 2019, 11:11 PM) *

Cost out getting the throttle shaft bushes redone,its a specialist job and is normally expensive...not DIY by any means,it's an involved process requiring special jigs and reamers.
The repair work is the big cost ,just don't get the cheapest price because you won't get what you really need.
Folks doing this are thinning out I understand legend Paul Abbot is scaling back on new work these days I guess he may be retiring ?
Parts Klassic (?) do them from memory and think there are a few others,good luck.


(IMG:style_emoticons/default/agree.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rhodyguy
post Jul 15 2019, 11:36 AM
Post #9


Chimp Sanctuary NW. Check it out.
***************

Group: Members
Posts: 22,060
Joined: 2-March 03
From: Orion's Bell. The BELL!
Member No.: 378
Region Association: Galt's Gulch
Inquire at Blackline Racing. Murray Utah. Ustah be Air Cooled Engineering, A.C.E.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Eric_Shea
post Jul 16 2019, 02:36 PM
Post #10


PMB Performance
***************

Group: Admin
Posts: 19,274
Joined: 3-September 03
From: Salt Lake City, UT
Member No.: 1,110
Region Association: Rocky Mountains
If they're off you can look for carbon trails on the butterfly's
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
type2man
post Jul 16 2019, 02:44 PM
Post #11


Member
**

Group: Members
Posts: 353
Joined: 3-March 09
From: Miami, Fl
Member No.: 10,127
Region Association: South East States
Wiggle the throttle shafts. Also while the carbs are out, shine a light on the throttle shafts to check for a bent shafts or butterflies. Other than that, just clean them and run them. Or you can upgrade to dells. They don't wear like the Webers do....and run much better.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
lalee914
post Jul 16 2019, 03:09 PM
Post #12


Senior Member
***

Group: Members
Posts: 811
Joined: 13-February 13
From: Georgetown, DE
Member No.: 15,521
Region Association: North East States
You can find the Weber manuals here:

http://p914-6info.net/Manuals.htm

Scroll down a bit.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Tdskip
post Jul 17 2019, 08:19 AM
Post #13


Advanced Member
****

Group: Members
Posts: 3,684
Joined: 1-December 17
From: soCal
Member No.: 21,666
Region Association: None
Good info, thanks gentlemen.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Tdskip
post Jul 17 2019, 12:04 PM
Post #14


Advanced Member
****

Group: Members
Posts: 3,684
Joined: 1-December 17
From: soCal
Member No.: 21,666
Region Association: None
And this is why - as you all recommended - you clean carbs before using them.

Attached Image
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Tdskip
post Jul 17 2019, 12:06 PM
Post #15


Advanced Member
****

Group: Members
Posts: 3,684
Joined: 1-December 17
From: soCal
Member No.: 21,666
Region Association: None
(Dupe - sorry)
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Tdskip
post Jul 17 2019, 12:07 PM
Post #16


Advanced Member
****

Group: Members
Posts: 3,684
Joined: 1-December 17
From: soCal
Member No.: 21,666
Region Association: None
Attached Image
User is online!Profile CardPM
Go to the top of the page
+Quote Post
914Toy
post Jul 17 2019, 01:52 PM
Post #17


Senior Member
***

Group: Members
Posts: 716
Joined: 12-November 17
From: Laguna beach
Member No.: 21,596
Region Association: Southern California
While you have these accelerator pump covers off, use a medium course sandpaper on a flat surface (eg granite cabinet top) to sand the the covers flat. Tightening the four bolts over the many years can bend the bolt hole "ears".
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Tdskip
post Jul 17 2019, 02:09 PM
Post #18


Advanced Member
****

Group: Members
Posts: 3,684
Joined: 1-December 17
From: soCal
Member No.: 21,666
Region Association: None
Good tip, thanks Keith.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 25th April 2024 - 09:02 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...