Author Topic: Erratic running  (Read 1776 times)

0 Members and 1 Guest are viewing this topic.

thepuddlejumper

  • Super Member
  • ***
  • Posts: 685
  • Karma: 2
  • Location: Scotland
Erratic running
« on: September 19, 2011, 12:54:17 PM »
I have been having erratic running problems for quite some time now.  Thought it was the petrol tank or fuel delivery system.  The tank has a huge dent on the underside so thought the air bubbles in the fuel pipe may have been a broken pipe in the tank.  Anyway bought a new to me tank, thanks Rusty, Found a new sender unit in Greece.  Fitted it all up with new pipes and filter ran well for a couple of days then the dreaded problem re-apeared.  Stripped the carb now thinking it may be dirt left over ?? found this see photos. The pivit pin suppot holes are worn.  Fitted new carb hope this cures it.

Ralph

GTMaster

  • Super Member
  • ***
  • Posts: 809
  • Karma: 2
  • Na most a tuti- tuti- tuti
Re: Erratic running
« Reply #1 on: September 19, 2011, 07:28:24 PM »
Certainly wore away  :o Usually the shaft/pin wears away first (the one in mine is a bit worn)..
"One more drink, Lacikám?"

All about car restoration can be found in the song
"Got my mind set on you" by George Harrison...

Rusty's Uncle

  • Subscriber VIP+
  • Super Member
  • *****
  • Posts: 2837
  • Karma: 34
Re: Erratic running
« Reply #2 on: September 19, 2011, 08:27:54 PM »
Wow , I have stripped & rebuilt loads of 500 & 126 carbs but that is the worst one I have ever seen. As GT says it is normaly the brass pivot pin that wears so I do not know what was going on witrh that one.

thepuddlejumper

  • Super Member
  • ***
  • Posts: 685
  • Karma: 2
  • Location: Scotland
Re: Erratic running
« Reply #3 on: September 20, 2011, 07:13:31 PM »
Took the 126 to work today with no problems ran as sweet as a nut, only 40 miles but it felt good. So it looks as if this was the problem all along.

Ralph

thepuddlejumper

  • Super Member
  • ***
  • Posts: 685
  • Karma: 2
  • Location: Scotland
Re: Erratic running
« Reply #4 on: September 21, 2011, 06:49:52 PM »
Spoke too soon, I decided to take the 126 to work again today.  Firstly it has always started on the button, but this morning it took a couple of chuggs to start.  After 18-20 miles started to loose power along with very erratic running.  It finally gave up in Grangemouth, looked in the engine compartment checked points and spark all OK then noticed petrol driping from the carb around the choke pump, the tray was overflowing with pertol and was running down the back of the cowling with a small pool on the ground. So a call to the AA 12:45 I explained the problem and that the van could not tow the car as it was too narrow.  This fell on deaf ears as I was told the officer would look at it and decide what was required.  I was told 3/4 hr and they would be there, 2 hrs later he arrived then called for the truck so arrived home 5:45.  I hope the problem is the old carb gaskets have dried out and are now leaking.  Looks like a carb strip and rebuild. Anyone had a similar problem after fitting an old carb?

Ralph

GTMaster

  • Super Member
  • ***
  • Posts: 809
  • Karma: 2
  • Na most a tuti- tuti- tuti
Re: Erratic running
« Reply #5 on: September 21, 2011, 09:20:44 PM »
Could it be the carb was overflowing with petrol (float level problems, that would cause erratic running as well) which is why it was dripping out?
"One more drink, Lacikám?"

All about car restoration can be found in the song
"Got my mind set on you" by George Harrison...

thepuddlejumper

  • Super Member
  • ***
  • Posts: 685
  • Karma: 2
  • Location: Scotland
Re: Erratic running
« Reply #6 on: September 23, 2011, 11:13:39 AM »
The AA guy tried hitting the float bowl to see if that would release a stuck float needle but tit didn't work, it still could be a stuck needle. I will be taking the carb apart to check but may use the original carb body with the top off my replacement.

Ralph

thepuddlejumper

  • Super Member
  • ***
  • Posts: 685
  • Karma: 2
  • Location: Scotland
Re: Erratic running
« Reply #7 on: October 15, 2011, 09:39:06 PM »
Finally got round to stripping the carb and guess what I found a crack in the float and it was full of petrol.  So found the reason petrol was leaking out everywhere.  Changed the float and used the original carb body with the new top and all seems to be working well for the time being.

Ralph