Lotus Elan

vacuum leak

PostPost by: "Peter Walker" » Sat May 28, 2005 1:40 am

You can check for vacuum leak by spraying WD40 on the suspect points with
the engine running, this should change the idle if there is a leak by
momentarily blocking it. If it doesn't make a difference then you probably
need to look elsewhere.

You can also use propane onto the point to test it but I have never done
this. It's come up before so the details should be in the archives.

Peter
66S2

----- Original Message -----
I've determined I'm getting a vacuum leaks around the throttle shaft
bearings on the 40DCOE18 Webers on my S1.

Hey, they're only 40 years old, doesn't anyone make stuff to last anymore?

Would like to replace the bearings with sealed versions. Anyone know the
bearing size of the little buggers (i.d., o.d., width) or a suitable

replacement part number?
Thanks,

Scott
"Peter Walker"
 

PostPost by: "65 Lotus" » Sat May 28, 2005 2:24 am

Yes, I used starting fluid. Spraying shaft bearing associated with the #3 cylinder damn near shuts down the engine.
----- Original Message -----
From: Peter Walker
To: ***@***.***
Sent: Friday, May 27, 2005 9:42 PM
Subject: [LotusElan.net] vacuum leak


You can check for vacuum leak by spraying WD40 on the suspect points with
the engine running, this should change the idle if there is a leak by
momentarily blocking it. If it doesn't make a difference then you probably
need to look elsewhere.

You can also use propane onto the point to test it but I have never done
this. It's come up before so the details should be in the archives.

Peter
66S2

----- Original Message -----
I've determined I'm getting a vacuum leaks around the throttle shaft
bearings on the 40DCOE18 Webers on my S1.

Hey, they're only 40 years old, doesn't anyone make stuff to last anymore?

Would like to replace the bearings with sealed versions. Anyone know the
bearing size of the little buggers (i.d., o.d., width) or a suitable

replacement part number?
Thanks,

Scott






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"65 Lotus"
 

PostPost by: "Peter Walker" » Sat May 28, 2005 3:11 am

Scott

Sounds like you have pinpointed it then. In most carbies the shaft is metal
on metal. As Webers have bearings it would be unlikely to have wear in the
shaft or carbie body still the air has to be getting in somewhere. I would
take the bearing to a local bearing supplier, they know how to decode the
numbers and if there is a sealed bearing available they should know about
it.

btw the Weber rebuild kits I bought had a leather seal for the shaft. Can't
see how that would seal vacuum but it could be important.

Good luck
Peter
66S2

----- Original Message -----
Yes, I used starting fluid. Spraying shaft bearing associated with the #3
cylinder damn near shuts down the engine.
"Peter Walker"
 

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