Terry Field Posted March 16, 2015 Author Share Posted March 16, 2015 Thanks Roger, I'll give it a try - probably be tomorrow now!Terry Link to comment Share on other sites More sharing options...
Terry Field Posted March 16, 2015 Author Share Posted March 16, 2015 Hi Roger,Managed to get a few minutes in the garage!Just to be clear, by pump rods I assume you mean the accelerator valve which is held in place by a small plate.I have taken both of these out and they seem to be clean, and moving freely. The same goes for the pump inlet and outlet valves.However, you talk about the rods 'sitting high'. With the throttle closed they are virtually sitting on the carb body. The front carb pump is only about 1mm up, and the rear about 1.5mm. When the throttle is opened, the rod falls by that minute amount, but that is all. How high would you expect the rods to be proud of the body?Regards Terry Link to comment Share on other sites More sharing options...
Klunk Posted March 17, 2015 Share Posted March 17, 2015 Hi Terry,For pump travel watch from 7min40s. Pump travel considerably more than you're getting! Regards,Giles Link to comment Share on other sites More sharing options...
Terry Field Posted March 17, 2015 Author Share Posted March 17, 2015 Now THAT really is helpful, at least in one way. It is clear that the cam on the spindle is not lifting the rod, so there seems be a problem there. But why is the same thing happening on both carbs? I guess I have got to the point where the carbs have to come off .Many thanksTerry Link to comment Share on other sites More sharing options...
Molecular--Bob Posted March 17, 2015 Share Posted March 17, 2015 Can you lift the pump rods by hand, or are they stuck? You could try cleaning the pump plunger housing with carb cleaner, I think the rod that operates the pump can deflect off its cam if the plunger is stuck. Link to comment Share on other sites More sharing options...
Terry Field Posted March 17, 2015 Author Share Posted March 17, 2015 Hi M-B,I have had the pump rods out a couple of times - they are clean and moving well without any stickiness. I can see the logic of your comment, but everything looks OKThanks Terry Link to comment Share on other sites More sharing options...
Molecular--Bob Posted March 17, 2015 Share Posted March 17, 2015 Does it look like fuel is reaching the pump chamber? just wondering if the spill valve or passageways have got gummed with varnish. Link to comment Share on other sites More sharing options...
john g Posted March 17, 2015 Share Posted March 17, 2015 Klunk,What a super video! Link to comment Share on other sites More sharing options...
Terry Field Posted March 17, 2015 Author Share Posted March 17, 2015 M-B, fuel is getting through everywhere apart from the last bit to the bores! Everything is really cleanI echo the views about the video - Part 2 follows part 1 for anyone wh is interestedHope to find time tomorrow to take the carbs offCheersTerry Link to comment Share on other sites More sharing options...
Molecular--Bob Posted March 18, 2015 Share Posted March 18, 2015 I feel your pain, I spent months trying to sort out an unstable idle before i figured out that it was a broken tab washer on the throttle arm that was causing my problem. I got very good at removing the carbs, by attempt 5 I could get them off the car in under 10 mins.On the upside I now have a ball bearing throttle pedal pivot, altered cable angle for improved smoothness, twin cable linkage and a new found willingness to have a go at most jobs on the car. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted March 18, 2015 Member Share Posted March 18, 2015 On the upside I now have a ball bearing throttle pedal pivot, altered cable angle for improved smoothness, twin cable linkage and a new found willingness to have a go at most jobs on the car.Excellent: there's not enough zeugma on BlatChat!Jonathan Link to comment Share on other sites More sharing options...
scorcher Posted March 18, 2015 Share Posted March 18, 2015 And there was I thinking it was a town in Anatolia........... Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted March 18, 2015 Member Share Posted March 18, 2015 Near Polysemy?;-)Jonathan Link to comment Share on other sites More sharing options...
Terry Field Posted March 18, 2015 Author Share Posted March 18, 2015 It started!Having determined to take the carbs off and find out why the pump rods weren't lifting, I was just about to set to with the spanners when I decided just to give everything one more bash to see if anything changed. I held open the throttle and pumped the fuel pump rods manually (done this several times before) and I could hear petrol moving around. The next minute up popped the fuel pump rods to the level they should have been at.Put it all back together and it started on the button. I still have no real idea what was wrong, or why it affected both carbs, but we are back on the road again, and I have learned a hell of a lot about Webers which I did't know before.So it is a big THANK YOU to everyone on Blatchat who helped out with such good advice, especially to Roger and Klunk. What an amazing club this is!CheersTerry Link to comment Share on other sites More sharing options...
Klunk Posted March 18, 2015 Share Posted March 18, 2015 Link to comment Share on other sites More sharing options...
Roger King Posted March 18, 2015 Share Posted March 18, 2015 Link to comment Share on other sites More sharing options...
Edzup Ezzer Posted March 19, 2015 Share Posted March 19, 2015 It's been a fascinating following this 'whatdunit'. Good news it's been solved but disappointed we still don't know the culprit! Back to Mrs Marple for my sleuthing entertainment then. Link to comment Share on other sites More sharing options...
Bob Shelley Posted March 19, 2015 Share Posted March 19, 2015 God news Terry. Hope it doesn't happen again in Wales!!Blatchat does it again. Link to comment Share on other sites More sharing options...
OliverSedlacek Posted March 20, 2015 Share Posted March 20, 2015 The pump jets are very small, and virtually impossible to blow through. Because they present a for resistance, you need to check the one way valves in the pump circuit. I also suspect that the whole mechanism may be stuck as it relies on spring pressure for operation. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now