• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

Sanity check

sparkydave

Jedi Knight
Country flag
Offline
The other day I checked on the Zenith carb's vacuum pull-off for the quasi-automatic choke, and made sure the piston wasn't gunked up. Well, I took the cover off the end with the 3 screws, thinking for sure there was a spring under there, and there wasn't one. Since Moss's catalog and the service books aren't showing the level of detail I need, is there supposed to be a spring between the piston and the end cap? I thought for sure there was, unless I lost it while I was servicing the carb many moons ago. The good news is I have a spare carb I could steal the spring from, but it's still packed away somewhere after my recent move, otherwise I could look at that one easily.
 

Morris

Yoda
Offline
Yep. Definitely a spring in there. The spring should pull the choke cam into full choke. Then the vacuum pulls the piston forward so that it is no longer engaging the cam. Thus the cam is now controlled by the thermospring.

Make sense?

Anyway, when you remove the cover, you see the piston, not the spring. The spring is under the piston in the shaft.
 
OP
sparkydave

sparkydave

Jedi Knight
Country flag
Offline
Ah, thank you sir. I remember seeing a spring in there somewhere, but I couldn't remember which side it was on. Thanks!
 

DrEntropy

Great Pumpkin
Gold
Country flag
Offline
Sanity check: All systems go!

...just grinnin' over that bi-metal spring and the Rube Goldberg-like engineering. Gotta love the English "simple" answer to an engineering problem! They *imagined* the cars wouldn't sell with a manual choke.

...but if they'd just bit th' bullet and put ~electric~ starters on their bikes, they'd STILL be outselling the Japanese...

Or Harley, at least. /ubbthreads/images/graemlins/devilgrin.gif
 
Similar threads
Thread starter Title Forum Replies Date
Rut Sanity check! Spridgets 2
NutmegCT Sanity check please! Other Cars 90
V Sanity check please. Austin Healey 3
RickB SANITY CHECK PLEASE - 1-3-4-2 ??? MG 17
M Sanity check - starting project on MGA Restoration & Tools 6
RAC68 Corona Virus Sanity Austin Healey 25
regularman A plan to keep my sanity Spridgets 6
mjobrien Start up Sanity check….. Austin Healey 5
T General Tech Once again, check the easy stuff Triumph 2
AngliaGT Got Lucky Today - CHECK THOSE BOLTS! Spridgets 6
S Price check on TR3A valve cover Triumph Classifieds 0
Twit TR4/4A early tr4 check straps Triumph 4
F Check for matching nrs Austin Healey MK2 Austin Healey 3
Lukens For Sale Check out this tr3 project for sale... A real treasure trove Triumph Classifieds 0
V TR2/3/3A Vertical link check Triumph 2
R TR4/4A Door check straps Triumph 7
68_sprite Check the August Oprah Magazine Austin Healey 5
M TR2/3/3A TR-3A Compresson check hot vs cold Triumph 5
HighAltitudeTR3 TR2/3/3A Door Check Assembly Triumph 19
S Door Check Strap Austin Healey 5
AngliaGT Why You Should Double - Check Your Parts When You Receive them. Spridgets 2
T TR2/3/3A Where is best spot to check temp with infrared thermometer? Triumph 17
AngliaGT Anyone in Charlotte,NC That Could Check Out a Truck for Me? Other Cars 0
C Rough Idle - What to check? Austin Healey 12
KVH TR4/4A Door Check Straps Triumph 11
S Overdrive Wiring Check Austin Healey 12
Michael Oritt Door check installation Austin Healey 7
P TR2/3/3A TR3 turn signal and horn control wiring check Triumph 4
warwick-steve Brake drum check and lubrication Austin Healey 9
1 Price check on an original 1957 100-6 BN4? Austin Healey 29
Mickey Richaud General Tech Always Check the Fundamentals MG 10
F Check out this new restoration diary - BT7 - very brave! Austin Healey 7
D TR2/3/3A Door check bracket? Triumph 7
C Brake issue on my 1969 XKE - what to check first? Jaguar 14
Martinld123 Compression check 1956 BN2 Austin Healey 7
M BN1 door check replacement Austin Healey 9
R Last minute check before engine install Austin Healey 26
Boink Check out some Sprite shots at the Portland ABFM... Spridgets 1
Rut TR4/4A Get out your check books! Triumph 10
Gerald_Gordon TR4/4A Failure of new door-check strap on an early 1961 TR4 Triumph 6
S How to check Dwell on a MK I 3000? Austin Healey 27
K TR2/3/3A Re: TR3 Bump stops and check straps. Triumph 18
PatGalvin TR2/3/3A vacuum leaks? How to check Triumph 9
jlaird Check Spam folder Spridgets 3
I TR6 Got in a wreck - need some help on who to take it to and what to check Triumph 48
HealeyDave Door Check Friction Adjustment Austin Healey 12
RedTR3 TR2/3/3A How to check for cylinder-to-cylinder head gasket leak Triumph 7
sundown TR6 1973 TR6 door check straps Triumph 3
DanLewis Weber 40DCOE - Does it need a check valve in the fuel supply line? Spridgets 4
drooartz General Tech Check those brake hoses! MG 11

Similar threads

Top