Re: [diesel_mercedes] Glow Plug Question

 


I went thru 3 batteries before I got a good one.Sometimes new ones fail
--- On Sun, 5/8/11, Alan Boucher <alstheone@verizon.net> wrote:

From: Alan Boucher <alstheone@verizon.net>
Subject: Re: [diesel_mercedes] Glow Plug Question
To: diesel_mercedes@yahoogroups.com
Date: Sunday, May 8, 2011, 6:11 PM

 
On 5/8/2011 6:57 PM, Don Benski wrote:
 

Thanks for the responses.  Battery is new (last fall) as I killed the previous one getting to this point in the journey.  I double checked it anyway and it is putting out 12.22v as the glow plugs cycle.   Did not pump the throttle.  Engine turns over, then chugs a few times like it wants to start, then just turns over.  A little wispy smoke from the tailpipe, not much.  I haven't adjusted the valves yet, could that actually keep it from starting?

 

-Don in St. Louis

 

From: diesel_mercedes@yahoogroups.com [mailto:diesel_mercedes@yahoogroups.com] On Behalf Of Don Benski
Sent: Sunday, May 08, 2011 10:04 AM
To: diesel_mercedes@yahoogroups.com
Subject: [diesel_mercedes] Glow Plug Question

 

 

When we last visited my garage queen 240D (1979) she wouldn't start and I was busy checking the fuel system.  After verifying that fuel was indeed getting to the injectors, it was suggested I check the glow plug system (Thanks, Brian.)  Everything appears to be Ok but…with a fully charged battery (13.1v at the terminals) the glow plugs are only showing around 10.7 volts.  Will the plugs work at 10.7V?  Is this voltage drop normal?  If not, is the likely culprit the relay?  As a side note, a previous owner had retrofitted the car with the pencil style glow plugs (Bosch) and wired them in parallel.  As the ambient temperature in my garage for the past two days has been over 70 degrees I tried to start the car.  No joy.

 

-Don in St. Louis

you betcha bippie.  This is a COMPRESSION IGNITION engine.  If the valves don't open at the proper time you don't get enough air in and if they don't close at the proper time you don't have enough compression to fire the engine.  Actually in this case its more whether they are sealing properly on the compression stroke than any minor lead or lag caused by bad clearances.  There is of course also the possibility that you have enough burned, warped or otherwise poor fitting valves that it won't start without a valve job.  Adjustment is the first step.  If that doesn't work check the compression.

Al Boucher

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