One tiny adjustment... the torque range neeed is, I believe, 30-40Nm,
not lb-ft... make sure you use the proper setting on your wrench.
Over-torquing can damage the pump. The torque procedure is listed in
the TDM (Tech Data Manual), not the normal service manual (don't ask
me why).
:-)
-dm
> ------------------------------
> Date: Tue, 09 Aug 2005 09:58:49 -0400
> From: Marshall Booth <[EMAIL PROTECTED]>
> Subject: Re: [MBZ] I/P Delivery Seals
>
> Peter Arnold wrote:
> > Dave mentioned that changing the "Delivery Seals" may repair my pump.
> > Is that in the POS manual? Parts & Tool from my usual Source {Rusty
> > or Salvation Army Thrift Shop}
> > I will be trying to advance the idle screw clockwise tonight per
> > Marshal's suggestion.
> >
> > --
>
> Delivery valve seals will NOT fix a problem with idle speed adjustment!!!!
>
> Replacing delivery valve seals is RARELY needed, but IF required,
> nothing else will solve the problem. Maybe 1-2% of Mercedes injection
> pumps require them during their lifetime. There is really NO reliable
> test of delivery valve seals except with the pump on a test stand. It is
> probably wise to replace the pump seals IF you're going to replace the
> "O" rings on the delivery valve pipe fittings as the seals are
> inexpensive, but it's rarely actually necessary. The only reason to
> replace the seals is if there is uneven delivery from the IP to the
> injectors. My very crude test of delivery seals is to remove all the
> injection lines and crank the engine while watching what comes out of
> the pipe fittings - each should deliver about the same amount of fuel. A
> really proper test (the way it would be done on a test stand) would
> measure the output and pressure of each port during some number of
> revolutions of the pump - each should deliver about the same amount of fuel.
>
> When playing with the injection pump a little finesse and care is
> required. The pump body is quite easy to distort if anything is
> overtightened (usually "repaired" by loosening and retightening using
> the proper torque/release technique as outlined in the Tech Data
> Manual), or a little too much force on a wrench CAN crack the housing
> and if that happens a new pump is the only solution.
>
> I do NOT recommend people trying to "tune up" their injection pump as
> injection pumps rarely fail, do NOT routinely drift out of adjustment
> and about 90-95% of all injection pump problems occur right AFTER the
> pump has been "adjusted." Only if all of the injectors have been TESTED
> and shown to be working PERFECTLY but fuel delivery still seems uneven
> is there sufficient justification to even consider playing with the
> delivery valve seals (in MY opinion). Get half a dozen new seals AND "O"
> rings (and several spare "O" rings as it's easy to damage one or more
> when installing the delivery valve fittings). Oil the "O" ring when
> installing it. You'll need the splined socket and a torque wrench
> accurate in the 30-40 lb-ft range. The fittings CAN be removed with the
> intake manifold in place (but it's a little tight).
>
> Worth checking the engine manual.
>
> http://mb.braingears.com/124_DISC1/Program/Engine/602_603/07.1-8627.pdf
>
> Marshall
