[Rovernet] P5 problem persists

[GeffMcCarthy]

The carb on my "63 is an HD8, which is being rebuilt...!

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Geoffrey W. McCarthy MD MBA DipAvMed
677 NW Melinda Ave Portland OR USA 97210
503-241-8468(h) 503-799-3809 (mobile)

-----Original Message-----
From: Rovernet [mailto:rovernet-bounces at rovernet.org] On Behalf Of peter king via Rovernet
Sent: Sunday, May 24, 2015 6:23 PM
To: Rovernet
Cc: peter king
Subject: Re: [Rovernet] P5 problem persists

Thanks, Ben. That’s another interesting thought to ponder…  I don’t know the model of SU. It is a ’63 NADA, withe engine suffix C. 

I Just found a fuel pressure gauge. 3.1 psi on the fuel delivery, even when it starts getting rough. ALTHOUGH, I have a clear fuel filter installed now after the glass bulb, and I noticed that the amount of fuel in the filter gets progressively less as the engine warms up, to the point where the fuel filter is nearly empty of reserve fuel. The glass bulb which is before it stays full, and the filter is nearly empty. It looks like a drizzle of fuel enters, but maybe 3 psi is not meant to be a great deal of fuel.  

I checked the plugs to see if they were fouled. They were not. Now I need to figure out what to do about a plug that wants to cross-thread. Ugh. Two threads in and it starts to bind. 

Another lovely day here in Boston. New adventures tomorrow!

PK


> On May 24, 2015, at 8:01 PM, Ben Saunders via Rovernet <rovernet at rovernet.org> wrote:
> 
> Are you running a SD SU? Something tells me that trash on the diaphragm might cause a fuel failure even while there is fuel delivery.
> 
> On 05/24/2015 04:14 PM, peter king via Rovernet wrote:
>> Will check for spark again… just ran it till it got roughl and checked temp across the block at the point the plugs enter: 178, 196, 197, 204, 202, 198. coolant as it enters radiator 175, exits at 165. My fuel pressure gauge not working properly, and surprise! Auto parts stores aren’t carrying them for carburetor systems anymore. Will borrow one from my mechanic friend.
>> 
>> Thanks, all. The saga continues another time.
>> 
>> Peter
>> 
>> 
>> 
>> 
>> 
>>> On May 24, 2015, at 2:49 PM, Tom Rymes via Rovernet <rovernet at rovernet.org> wrote:
>>> 
>>> On 05/24/2015 2:36 PM, peter king via Rovernet wrote:
>>>> Back home, barely. Another 7 minutes of great running then sputtered into the garage.
>>>> 
>>>> No vacuum buildup in the tank, breather lines all clear.
>>>> 
>>>> Original mechanical pump delivering fuel to the bulb. New hotspark electronic igintion, new rotor, plugs. Wires relatively new. dis. cap is good. coil is newz 3.0 resistance.  8 gallons of new premium fuel in the tank—just over half full.
>>>> 
>>>> I need to did through my points/condensers to see if I have the right ones.
>>>> 
>>>> What about localized overheating vaporizing gas after the engine gets hot? How can I rule that out?
>>> Peter: As I mentioned earlier, you first need to narrow this down. All problems like this come down to fuel, air, or fire (spark), and air seems unlikely.
>>> 
>>> Checking for spark when it dies is the quickest and easiest thing to start with. Then, if you have no spark, start working through the ignition system. If you DO have spark, then start working your way through the fueling system.
>>> 
>>> Tom
>>> 
>>> PS: Vapor lock while running (as opposed to after being parked for a while) seems highly unlikely. If you hear hooves, look for horses, not zebras.
>>> 
>>> PPS: More likely would be a sticking needle valve in the fuel bowl (or Grose Jet if so equipped).
>>> 
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>> Peter King
>> Peter King + Company
>> 21 Drydock Avenue
>> Floor 7
>> Boston, MA 02210
>> 617-292-7877
>> www.king-co.com
>> 
>> 
>> 
>> 
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Peter King
Peter King + Company
21 Drydock Avenue
Floor 7
Boston, MA 02210
617-292-7877
www.king-co.com




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