From: Antonio Regazzoni (Home) (antonio.regazzoni@bluewin.ch)
Date: Tue Aug 05 2003 - 08:06:21 PDT
Thanks to all of you for the first answers.
Yes Dick. I cleaned the spark plugs and adjusted the electrode
clearance.
I can see sparks on them. I must say that they are not very bright.
This makes me think about an electrical problem.
The tank is full, the fuel pump line disconnected from the carb,
can fill up o small Coke bottle in just 10 seconds during cranking.
I have a transparent fuel filter on the fuel line as well and I can
see the fuel flowing though it while cranking. I suppose
that when the carb bowl is filled up, fuel excess goes back to the
tank through the return fuel line.
I saw something that could be normal or not, please comment. If I remove
the big rubber hose between the air filter and the carb air intake, I
can se
the fuel squirts coming up during cranking at the rithm of the fuel pump
stroke.
This happens even if I do not push on the accelerator. Since the engine
doesn't
start, quite a lot of fuel drops back out from the carb open end. Is
this normal ?
I rebuilt the carb to specs using a new kit. I checked the float
distances in
both upper and lower positions. I even tried to put back the old fuel
intake
valve to exclude a carb flooding problem.
The last thing I must say (the last thing is usually the reason of all
the problems),
is that I have a cracked carb float. Unfortunately there was no
replacement
in the carb kit. It appears to be a black full-plastic float (not empty
inside)
and therefore I'm not very concerned about it. Am I wrong ?
What else can I check ?
Thanks,
Antonio or Tony if you prefere ...
-----Original Message-----
From: rertman@ix.netcom.com [mailto:rertman@ix.netcom.com]
Sent: Tuesday, August 05, 2003 4:24 PM
To: Antonio Regazzoni (Home); MIL-VEHICLES
Subject: Re: [MV] M151A2 Starting Problem - Solved (I hope)
Tony:
Sometjning's very strange. When you crank the engine, the battery
voltage should drop a lot more than 1.8 V. Stop by your local auto
parts store and get one of those handy amp meters that you clip
onto the positive battery cable and see hoe much current the starter is
pulling while you crank the engine. The meter couples and measures
magnetically, so it won't damage your cable. I'm not a MUTT expert, but
I think the battery voltage should drop about 10 volts during engine
cranking.
And I agree that the ignition system shouldn't be so finicky that it
stops working at 23 V. I trust you did all the obvious stuff and
checked for spark and fuel while cranking?
Good luck,
Dick
"Antonio Regazzoni (Home)" wrote:
>
> Hi list,
>
> I think I'm having the same problem as Rich Sherman. I have a M151A2
with two good batteries. They are not charged 100% but I can measure
12.6 V on both of them. This makes 25.2 V total. When I crank the engine
I can measure 23.4 V. The engine doesn't start !
>
> I cannot believe that the ignition system is so sensitive that with
23.4 V doesn't give enough sparks to start the engine. I'm thinking that
the problem could be in a big voltage drop between the batteries and the
ignition coil, or a bad coil or capacitor.
>
> I will measure the input voltage at the coil and check all the
electrical connections from the battery to the ignition system.
>
> Any comments ?
>
> Thanks,
>
> Antonio Regazzoni,
> 1944 MB
> 1974 M151A2
> 1975 Pinzgauer
>
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