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+---- Thread: 34-PDSIT-2 Carb idle Speed screw vibrates and closes (/showthread.php?tid=488)
34-PDSIT-2 Carb idle Speed screw vibrates and closes - Pabloako - 04-02-2023
Hi everyone,
I have found a new feature on my Type4 (1800cc) engine and the 34-PDSIT carb, where if I adjust the idle speed screw, the vibration from driving causes the screw to rotate in. The first thing I know is that I start idling (and chugging) at about 500rpm. If I adjust it out it is fine for a while and then rotates back in again.
Has anyone else experienced this? Does anyone think if it would be ok to put a tiny bit of Loctite towards the top of the screw?
RE: 34-PDSIT-2 Carb idle Speed screw vibrates and closes - Tintop - 05-02-2023
is the o-ring missing? that usually assists in keeping it from vibrating loose
RE: 34-PDSIT-2 Carb idle Speed screw vibrates and closes - Pabloako - 05-02-2023
Ooo, thank you. I will check.
RE: 34-PDSIT-2 Carb idle Speed screw vibrates and closes - Barry - 05-02-2023
As said above.
Even if you have the O ring check to see it the sides are curved.
Old ones will “square” off
RE: 34-PDSIT-2 Carb idle Speed screw vibrates and closes - Oldman - 06-02-2023
(05-02-2023, 12:04 PM)Barry Wrote: Old ones will “square” off…..and as a result,not put any pressure on the sides, lose seal and vibrate loose…..
O rings, no matter where they are can be one of those simple fix failures.
How’d you go?
RE: 34-PDSIT-2 Carb idle Speed screw vibrates and closes - Pabloako - 06-02-2023
(06-02-2023, 05:59 AM)Oldman Wrote: …..and as a result,not put any pressure on the sides, lose seal and vibrate loose…..
O rings, no matter where they are can be one of those simple fix failures.
How’d you go?
There is one on there, but it is showing its age and cracked.
I will go in the hunt for a new O ring. To be honest, my bus has given me several rather expensive surprises, so this is a lovely easy and cheap one!
Bg thank you everyone.
RE: 34-PDSIT-2 Carb idle Speed screw vibrates and closes - Pabloako - 02-03-2023
I finally got around to doing this, after konking out at traffic lights and roundabouts and having to jump out into the traffic with a screw driver. At least I got a few laughs from people behind me.
I have replaced the O-ring and a simple 5mm "petrol safe" O-Ring from Supercheap. It is all nice and snug again and doesn't move.
RE: 34-PDSIT-2 Carb idle Speed screw vibrates and closes - Oldman - 02-03-2023
Gotta love an easy fix
