Yes Bogy , you're correct , raising the overflow valve's opening pressure also serves to fill the delivery valves faster .
The improvement in power and addition of silky smooth engine cannot be imagined until you've tried this .
The delivery valves can and do wear , get dirty and I now have a bunch that have corrosion damage , this can't be a good thing .
If your testing finds one that's weak , I'd like you to swab the well again after removing the valve components , I have discovered there can be residual crud / dirt inside the I.P. that breaks loose as you take better care of it and it gets cleaner....
I work in fits and spurts , it's hot here now (102° F in the SHADE) so I'm taking a day off @ SWMBO's request , I can use the rest (if I actually get any) .
Please keep us informed as to what you find ~
My engine rocks quite a bit @ hot idle , I tried loosening each injector pipe one at a time and the rocking didn't change so I'm hoping there's some issue inside the I.P. as i have one to replace it with , from a smooth free clean fuel wreck...
Did I mention that I found some old photos of my Coupe's dash board and did a little bit of quick math , turns out I've put over 70,000 miles on the rebuilt engine
.I just hot changed the oil & filter again , I shoulda taken a photo 'cause it looks so nice and clean right now....
-Nate
Bogy wrote :
Nate:
I was under the impression that the fuel pressure in the IP galley was due to the check valve on the back of the pump that has a banjo bolt and returns the fuel to the tank. I'm talking about the check valves on the delivery valves. If that is what you are talking about then I am at a loss to explain why. Either way 10 psi should be enough to refill the individual cylinder pumps. Perhaps a check valve and a small accumulator between the fuel filter and the inlet to the IP would smooth out the fluctuations.
On a different note I am now noticing a return of the/a weak cylinder when the engine gets hot. Is it possible that these check valves in the delivery pipes can stick or otherwise not seal properly when they heat up? It's easy enough for me to check. just swap out the valves one at a time until the problem goes away. But that's for tomorrow.
By the way, in my cleaning I found another 6 injectors. I will test them tomorrow too.
Good luck with it all. Keep us posted and maybe we can help.
Bogy.
"Hardware eventually fails. Software eventually works" - Michael Hartung
From: "vwnate1@... [diesel_mercedes]" <diesel_mercedes@yahoogroups.com>
To: diesel_mercedes@yahoogroups.com
Sent: Tuesday, August 9, 2016 7:59 PM
Subject: [diesel_mercedes] Delivery Valves
Thanx ;
I was fiddling with the car to - day and installed a liquid filled American made pressure gauge between the fuel filter and the I.P. to check the transfer pressure .
With the old valve installed and a stretched spring I got 10 ~20 PSI fluctuating rapidly @ idle , revving it up it went to 23 PSI and stayed there , still vibrating the needle .
I then swapped out the old valve for a new one from Ma 'Benz and the idle pressure was 0 ~ 10 PSI and went up to nearly 20 PSI when I revved it , same flickering of the gauge's needle .
I don't know if this is normal or not ? .
-Nate
Bogy wrote :
First swap was between 3 and 4 on the same IP after cleaning the original #4..
When #3 (the old #4) still didn't work like I thought it should I swapped it with one off the om617 that I first put in the jeep.
So Both.
Bogy.
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Posted by: vwnate1@yahoo.com
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