Reply
 
Thread Tools Search this Thread
 
Old 24 October 2009, 04:37   #1
Member
 
Country: UK - England
Town: Manchester - Abersoc
Boat name: MeMe
Make: SeaPro 595CC
Length: 6m +
Engine: Mercury 115 4S
Join Date: Jul 2003
Posts: 1,681
Send a message via MSN to MeMe
Twin Choke Weber

...........when in doubt, the ribnet forum always comes through !

My 1986 Jeep Wrangler, powered by a 4.2L Petrol straight 6 is aided by this TC Weber however and unfortunately, she has become a real pain to start in the morning. Upon investigation I found that the chokes were not closing however, if I pushed them closed manually, she fired up first time as usual.

Further investigation (by the way, my knowledge of engines and mechanics stretches no further than, if I turn the key, or push the button, it starts) I noticed that the auto choke was "loose".

I decided to take if off to see what was inside and found a coil which, I can only describe as something akin to a barometer coil (I hope I'm not getting to technical for you ;-) All looked well so I put it back together and tightened it up !

I figured that when cold the coil would close the chooke and when warm etc etc. That's as far as I've got but it still wont cold start !

So - presuming that this coil cant be broken, what is the methodoligy in setting the same as there are two arrows on the choke and a wire !!!!!


Pictures attached !
Attached Thumbnails
Click image for larger version

Name:	DSCF0131 (Small).JPG
Views:	109
Size:	63.3 KB
ID:	47033   Click image for larger version

Name:	DSCF0041 (Small).JPG
Views:	104
Size:	66.1 KB
ID:	47034  
__________________

__________________
Buy it & Use it, then sell it and buy something bigger
MeMe is offline   Reply With Quote
Old 24 October 2009, 04:50   #2
mdt
Member
 
Country: UK - Scotland
Town: fife
Make: Humber / searider
Length: 5m +
MMSI: ... - - - ...
Join Date: Sep 2005
Posts: 720
IF I am reading your post right there is a wire linked to this choke it is likely that this is sending a signal from a sender unit on the block somewhere? This may be the issue so check the wiring and sender unit.

The other option is to buy a manual conversion kit dead easy to fit even for the non technical? Or you could just pump the throttle 2 or 3 times before you turn the key this will get the pump jets firing enough fuel in to give you a rich mixture to start it?

Good luck
__________________

__________________
“The only difference between men and boys, is the price and size of their toys”
mdt is offline   Reply With Quote
Old 24 October 2009, 04:57   #3
Member
 
Country: UK - England
Town: Manchester - Abersoc
Boat name: MeMe
Make: SeaPro 595CC
Length: 6m +
Engine: Mercury 115 4S
Join Date: Jul 2003
Posts: 1,681
Send a message via MSN to MeMe
can you see the........

......sender unit in these pictures ? The wire attached to the choke goes directly back in to the bulk head which I fugured went to a light on the dash to advise the choke was activated however, this light has never lit (should it exist) however, until recently, she always fired up regardless of a light.
Attached Thumbnails
Click image for larger version

Name:	DSCF0073 (Small).JPG
Views:	110
Size:	66.8 KB
ID:	47035   Click image for larger version

Name:	DSCF0074 (Small).JPG
Views:	104
Size:	63.1 KB
ID:	47036  
__________________
Buy it & Use it, then sell it and buy something bigger
MeMe is offline   Reply With Quote
Old 24 October 2009, 14:21   #4
RIBnet supporter
 
Erin's Avatar
 
Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
Engine: 200 Suzzy
Join Date: May 2004
Posts: 2,830
Does it need a bit of carb cleaner to free up a sticking choke valve?
__________________
Erin is offline   Reply With Quote
Old 25 October 2009, 10:22   #5
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Jeez this is digging into the old brain cells from way back... now, my recollection is that the coil is a bi-metallic strip which warms with the engine and uncoils to rotate the choke butterfly. The setting, to some extent, depends on where you live and how cold it gets and how hot your engine runs. The clamp plate should be slackened and the choke mechanism rotated to make the spring just close the choke butterfly when the engine is cold then retightened. After that, the uncoiling of the spring and the engine suck within the carb will open the butterfly as necessary. It was a fairly crude system but worked ok-ish. As mdt suggests, pumping the throttle, rather slowly cos it takes time for the petrol to squirt in, will get the engine started and may also be necessary on really cold mornings but the engine may not continue to be drivable without the choke working correctly. The fact that it used to be fine and now isn't indicates a failure of some sort so it may need more than simply resetting. I think but can't completely recollect, some used to heat by electric current and others used the engine water to warm the bi-metallic coil.
__________________
JW.
jwalker is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 15:06.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.