The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
It is currently Thu Mar 28, 2024 7:52 pm

All times are UTC




Post new topic  Reply to topic  [ 8 posts ] 
Author Message
 Post subject: arggh idle screw seized
PostPosted: Sat Dec 02, 2017 4:33 pm 
Offline
Future Club member hopefully!
Future Club member hopefully!

Joined: Mon Dec 03, 2012 6:04 pm
Posts: 1549
I have found out why the Sprint transplant won't fire, I rebuilt the carbs and freed everything up; except the idle screw. They are both seized in the fully closed position. They also look to have the structure strength of twiglets, so I am very worried about shearing them.

The carbs are of course full of petrol, so heat is out of the question. It looks like I will have to take them off if freeing fluid doesn't do the trick and when does any freeing fluid ever work?

Oh well at least I got the downpipe on, with the world's most inaccessible bolt locations.


Top
   
PostPosted: Sat Dec 02, 2017 5:01 pm 
Offline
TDC Member
User avatar

Joined: Wed Nov 15, 2017 3:35 pm
Posts: 956
Location: Filey, North Yorkshire
Plus Gas or a mixture of acetone and ATF.
A good soaking.
Then gently tighten and then loosen.... but be prepared for the possibility of it shearing!

_________________
Image


Top
   
PostPosted: Sat Dec 02, 2017 5:52 pm 
Offline
TDC Member

Joined: Sun Mar 16, 2008 2:52 pm
Posts: 2303
Over the years S.U. carbs; had different solutions to stopping the idle screws vibrating loose. Some have springs ... and some have small locknuts at the base of the screw. If you have an early 1850 parts book have a look on page 19-25. The adjusters are 511726 and the small locknuts are 108350. From memory the lock nuts are an odd size. 4BA comes to mind.
Tony.


Top
   
PostPosted: Sat Dec 02, 2017 5:54 pm 
Offline
TDC Cheshire Area Organiser

Joined: Wed May 17, 2017 6:28 pm
Posts: 1405
Location: NANTWICH.
Also try tapping them gently with a small hammer, that sometimes works, well as tightening before undoing as said.
Cheers, Tony.

_________________
NOW A CLUB MEMBER 2017057 :bluewave:


Top
   
PostPosted: Sat Dec 02, 2017 9:06 pm 
Offline
TDC Member
User avatar

Joined: Sat Apr 12, 2014 11:02 pm
Posts: 2279
Location: Nr Kenilworth
The idle screws wont stop it firing. Choke out will be off the idle screws on fast idle anyway. Unless I missed something?

Tony

_________________
Membership 2014047


Top
   
PostPosted: Sat Dec 02, 2017 9:22 pm 
Offline
TDC West Mids Area Organiser
User avatar

Joined: Thu Sep 28, 2006 1:13 pm
Posts: 13316
Location: Over here...can't you see me?
I'm not sure if there are any idle screws in there as it has been raided several times at shows, but I have a box of dismantled carb components I can have a look through for you if the do shear (and you can successfully extract the bost bit)


Top
   
PostPosted: Sun Dec 03, 2017 6:59 pm 
Offline
Future Club member hopefully!
Future Club member hopefully!

Joined: Mon Dec 03, 2012 6:04 pm
Posts: 1549
Quote:
The idle screws wont stop it firing. Choke out will be off the idle screws on fast idle anyway. Unless I missed something?

Tony
The fast idle screw isn't touching the cam, so something is off.

I have taken it apart to check top dead centre. Took the plugs out and physically checked the piston. Can't check compression as the compression gauge we have doesn't work with recessed plugs. However it does have new rings, so in theory that should be ok.

I have a spark, it is roughly timed right, so it must be a fuelling issue.


Top
   
PostPosted: Mon Dec 04, 2017 8:00 pm 
Offline
Future Club member hopefully!
Future Club member hopefully!
User avatar

Joined: Tue Oct 03, 2006 7:38 pm
Posts: 2565
Location: Birmingham
Quote:
bost
:thumbsup:

_________________
Vindicator Sprint, Honda Fireblade RRX 919cc, re-powered by AB Performance. Quick.


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 8 posts ] 

All times are UTC


Who is online

Users browsing this forum: Trendiction and 29 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited