Screen Removal Bargman L-300 Door Handle brakes Satellite Fuel Tank Fire Extinguishers Roof Antenna Tech Talk Forum Shortcut Motor Oil Window Generators headlights batteries Radiator AC Unit Grab Handle Wiper Blades Wiper Blades Door Locks Door Locks Door Locks Door Locks Rims Front Shocks Rear Shocks Front Tires Oil Filter Steps Roof Vent Awning Propane Tank Mirror Info Clearance Lights Clearance Lights Clearance Lights Clearance Lights Clearance Lights Spartan Chassis Gillig Chassis Freightliner Chassis P-32 Chassis MCC Chassis
    Forums    Tech Talk    Vacuum advance.
Go to...
Start A New Topic
Search
Notify
Tools
Reply To This Topic
  
Vacuum advance.
 Login now/Join our community
 
Glassnose Aficionado
Supporting Member of Barthmobile.com 2/09
Picture of Danny Z
posted
After doing everything I could think of to get the Barth to run smooth at cruising speed, plugs, wires, cap, rotor, module, etc., I came across another guy with the same problem on another site. Many people suggested the vacuum advance as the culprit so yesterday I removed the 2 hose 1 steel tube setup and sure enough, all 4 connecting points were cracked open with age. Got some new tubing and put it all back together, and it really seems to be running better than ever. I didn't have time to get it out to the highway for a real test, but judging by how much better it runs I'm pretty hopeful. Just wish I hadn't destroyed one of my brand new turbo mufflers before I figured it out.


79 Barth Classic
 
Posts: 3650 | Location: Venice Fl. | Member Since: 07-12-2004Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 6/19
posted Hide Post
Good deal.
I was having a similar problem with my 86 F150 . Come to find out the vacuum advance line was on the wrong vacuum port on the carburetor .


Harold
Cat
Sam is 10 year old Miniature Schnauzer
Currently without a coach

KE5WCW
 
Posts: 134 | Location: Mooringsport,LA | Member Since: 05-30-2019Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 3/19
Picture of Mogan David
posted Hide Post
What a relief!
good news Salute
 
Posts: 2069 | Location: Jackson, Michigan, USA | Member Since: 04-18-2004Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 1/19
Picture of Steve VW
posted Hide Post
I found a list of vac advance specs. Looks like anywhere from 5-12 degrees were used. Most distributors had around 10 degrees of centrifugal advance also.


9708-M0037-37MM-01
"98" Monarch 37
Spartan MM, 6 spd Allison
Cummins 8.3 300 hp


PDF Docvac_advance.pdf (227 Kb, 3 downloads) vac advance specs
 
Posts: 4030 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 12/18
Picture of Duane88
posted Hide Post
So at idle one must disconnect and plug the advance drive vacuum hose and set the timing to a desired advance. Reconnect the hose and check again, knowing the vacuum at idle one can determine the amount of actual vacuum advance generated. Is this a good check?


25 Ft Glassnose, 2792, 1982
454 Engine
Plain Jane Interior
Original Paint
Picture by Kevin
 
Posts: 1090 | Location: Clinton Iowa | Member Since: 04-02-2017Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 6/19
posted Hide Post
Confused ok , it seems the Gremlins (some call it the "turd fairy") have attacked my truck . This morning my truck wouldn't start . It is acting like the timing is too far advanced or it jumped time head bang . I'm at the Fire Station today , I'll have to diagnose it tomorrow . Mechanic


Harold
Cat
Sam is 10 year old Miniature Schnauzer
Currently without a coach

KE5WCW
 
Posts: 134 | Location: Mooringsport,LA | Member Since: 05-30-2019Reply With QuoteReport This Post
Glassnose Aficionado
Supporting Member of Barthmobile.com 2/09
Picture of Danny Z
posted Hide Post
Took her out for a test drive yesterday. Still missing and sputtering. Is it possible the advance is stuck or not working for some reason?


79 Barth Classic
 
Posts: 3650 | Location: Venice Fl. | Member Since: 07-12-2004Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 12/10
Picture of ccctimtation
posted Hide Post
There's also centrifugal advance that gives the curve to the advance. The springs and weights can become frozen.


Money can't buy poverty
 
Posts: 885 | Location: St. Charles, MO, USA | Member Since: 10-09-2003Reply With QuoteReport This Post
"First Year of Inception" Membership Club
posted Hide Post
I remember reading a long time ago that there are a couple spark plug wires coming out of distributor that can’t be to close to each other or you could get a misfire by induction.


Ralph Glover
1976 27' Barth
P-30 454
1998 Tracker Toad
 
Posts: 196 | Location: LaFontaine, IN,USA | Member Since: 07-03-2001Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 12/18
Picture of Duane88
posted Hide Post
Dannyz, I bet you have already done this, but have you put in a new filter in the Rochester. Your problem sounds very much like gas starvation at speeds happens to Nose quite often.


25 Ft Glassnose, 2792, 1982
454 Engine
Plain Jane Interior
Original Paint
Picture by Kevin
 
Posts: 1090 | Location: Clinton Iowa | Member Since: 04-02-2017Reply With QuoteReport This Post
  Powered by Social Strata  
 

    Forums    Tech Talk    Vacuum advance.

This website is dedicated to the Barth Custom Coach, their owners and those who admire this American made, quality crafted, motor coach.
We are committed to the history, preservation and restoration of the Barth Custom Coach.