From: Bjorn Brandstedt (super_deuce@hotmail.com)
Date: Wed Aug 06 2003 - 05:01:28 PDT
As you know, the purpose of the float is to keep a certain amount of gas in
the bowl of the carburetor at all times. The gas in the bowl is never under
pressure. The needle valve, operated by the float must close perfectly. You
can test it while rebuilding the carb by lifting the float and blowing
through the fuel entrance.
If the gas is "pulsating" down the throat of the carb while cranking, then
you may be seeing the effect of the fuel pump pushing gas through the open
needle valve. That should not happen, the gas is sucked in by the vacuum in
the intake manifold. Check the needle valve!
Bjorn
>From: "Antonio Regazzoni (Home)" <antonio.regazzoni@bluewin.ch>
>To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
>Subject: Re: [MV] M151A2 Starting Problem - Solved (I hope)
>Date: Wed, 6 Aug 2003 11:03:07 +0200
>
>Hi Ken, list,
>
>the float has horse shoe shape and is cracked vertically on one of the
>external curves.
>The crack is very thin and it barely opens when you try to close the C
>shape extremities together with
>your fingers. The float has not been glued together because it is still
>in one piece and the pivot bracket
>is still firmly attached to it. I set the clearance at 3/32 when closed
>and 3/8 when open. I got these figures from the US Army manual. The
>nylon tip of the fuel shutoff valve is in like new condition, very clean
>and shiny. So was the old one too. I will try to replace the float from
>a spare carb of a friend of mine who owns the only other M151A2 here in
>Ticino, southern Switzerland.
>
>I will keep you informed ...
>
>Thanks ...
>
>Antonio
>
>-----Original Message-----
>From: Muttguru@aol.com [mailto:Muttguru@aol.com]
>Sent: Tuesday, August 05, 2003 6:51 PM
>To: Military Vehicles Mailing List
>Subject: Re: [MV] M151A2 Starting Problem - Solved (I hope)
>
>
>In a message dated 05/08/03 16:08:57 GMT Daylight Time,
>antonio.regazzoni@bluewin.ch writes:
>
><< I have a cracked carb float. >>
>
>
>Antonio,
>
>this could be the problem. Did the float crack and get glued back
>together?
>Did it break loose from the metal pivot bracket? If one f the float
>"arms" was
>cracked, how did you ensure that the float clearance (closed position)
>was
>correct? What clearance did you set the float clearances (open and
>shut)?
>And finally, was the nylon tip of the fuel shutoff valve in good
>condition?
>(no nicks, burrs or groove worn into it)?
>
>
>There should be some evidence of fuel spraying through the carb when
>cranking, but nothing excessive, and certainly not pulsing out like you
>describe.
>
>Ken
>
>===Mil-Veh is a member-supported mailing list==To unsubscribe, send e-mail
>to: <mil-veh-off@mil-veh.org>
>To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org>
>To reach a human, contact <ack@mil-veh.org>
_________________________________________________________________
Add photos to your e-mail with MSN 8. Get 2 months FREE*.
http://join.msn.com/?page=features/featuredemail
This archive was generated by hypermail 2.1.4 : Sat May 07 2005 - 20:23:34 PDT