| Carb Questions [message #146293] |
Wed, 12 October 2011 12:07  |
larry.whisler
Messages: 356
Registered: August 2005
Karma: 8
|
Senior Member |
|
|
I had a problem with our 76 glenbrook not running right. The coach was experiencing symptoms of vapor lock several months ago and I rebuilt the carb at that time.
When I disassembled the carb, I found that both of the large tubes ( either the bleed tubes or the accelerating tubes, I don't know which is which ) that are supposed to be pressed into the airhorn were laying in the carb and not connected to the airhorn.
I installed the carb and the coach ran great. Until last week. It started showing the same hesitation as before. Disassembled it again and found that one of the tubes had fallen out and the other one was loose enough to remove with my fingers. Evidently, I didn't use enough force to press in the first time ( for fear of bending the tubes).
This time I used a little more force and now they seem to be set in the air horn firmly. I used the handle from a tap set to grip the tube and tapped it firmly with a hammer. Seemed to work well.
Now my questions are: Which tube is which? And what do they do?
BTW, these symptom were just like vapor lock, engine would quit when hot, pull off the road and start right back up and run fine, get out on hot pavement and try to accelerate, engine would die and repeat above symptoms.
larry whisler
76 glenbrook
|
|
|
|
| Re: Carb Questions [message #146297 is a reply to message #146293] |
Wed, 12 October 2011 12:23  |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
|
Senior Member |
|
|
| larry.whisler wrote on Wed, 12 October 2011 12:07 |
I had a problem with our 76 glenbrook not running right. The coach was experiencing symptoms of vapor lock several months ago and I rebuilt the carb at that time.
When I disassembled the carb, I found that both of the large tubes ( either the bleed tubes or the accelerating tubes, I don't know which is which ) that are supposed to be pressed into the airhorn were laying in the carb and not connected to the airhorn.
I installed the carb and the coach ran great. Until last week. It started showing the same hesitation as before. Disassembled it again and found that one of the tubes had fallen out and the other one was loose enough to remove with my fingers. Evidently, I didn't use enough force to press in the first time ( for fear of bending the tubes).
This time I used a little more force and now they seem to be set in the air horn firmly. I used the handle from a tap set to grip the tube and tapped it firmly with a hammer. Seemed to work well.
Now my questions are: Which tube is which? And what do they do?
BTW, these symptom were just like vapor lock, engine would quit when hot, pull off the road and start right back up and run fine, get out on hot pavement and try to accelerate, engine would die and repeat above symptoms.
larry whisler
76 glenbrook
|
an ignition module on it's way out will have the same symptoms.
Fred V
'77 Royale RB 455
P'cola, Fl
|
|
|
|
|
|
| Re: Carb Questions [message #146322 is a reply to message #146293] |
Wed, 12 October 2011 16:34 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
|
Senior Member |
|
|
If I remember right those are vents. It isn't unusual for them to come loose If they don't fit real tight I would use a little epoxy to hold them in place.
Roy
Roy Keen
Minden,NV
76 X Glenbrook
|
|
|
|
| Re: [GMCnet] Carb Questions [message #146341 is a reply to message #146293] |
Wed, 12 October 2011 19:26 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Larry,
Here's a link to Gene Fishers website:
http://gmcmotorhome.info/list.html#engine
Do a search "Control F" for "Carb" and you'll find a lot of info about the carb.
Here's a link to Bdub's website:
http://www.bdub.net
Under "Lots of GMC Odds n Ends" you will find info about the Q-Jet.
http://www.bdub.net/oddsnends.html
Under "Manuals - All kinds of manuals that pertain to our GMCs" you will find more info about the Q-jet.
http://www.bdub.net/manuals/index.html
Regards,
Rob M.
-----Original Message-----
From: larry.whisler
I had a problem with our 76 glenbrook not running right. The coach was experiencing symptoms of vapor lock several months ago and I
rebuilt the carb at that time.
When I disassembled the carb, I found that both of the large tubes ( either the bleed tubes or the accelerating tubes, I don't know
which is which ) that are supposed to be pressed into the airhorn were laying in the carb and not connected to the airhorn.
I installed the carb and the coach ran great. Until last week. It started showing the same hesitation as before. Disassembled it
again and found that one of the tubes had fallen out and the other one was loose enough to remove with my fingers. Evidently, I
didn't use enough force to press in the first time ( for fear of bending the tubes).
This time I used a little more force and now they seem to be set in the air horn firmly. I used the handle from a tap set to grip
the tube and tapped it firmly with a hammer. Seemed to work well.
Now my questions are: Which tube is which? And what do they do?
BTW, these symptom were just like vapor lock, engine would quit when hot, pull off the road and start right back up and run fine,
get out on hot pavement and try to accelerate, engine would die and repeat above symptoms.
larry
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
