Author Topic: CSV Leaks  (Read 4330 times)

RonDwyer

  • Guest
CSV Leaks
« on: March 29, 2017, 02:11:25 »
Well, it was either take forever to start, or possibly leaky CSV issues.   Mine has certainly decided it wants to be a leaker not so long after I got the nozzles cleared.  Starts easily, runs like hell now.  Fuel definitely drips out the portal with the screw off and just the fuel pump running.  Are there any options for getting this valve back into operating condition?   I am told the kits are NLA...Any ideas on leaky valves here? 

Tyler S

  • Associate Member
  • Platinum
  • ******
  • USA, CA, Encinitas
  • Posts: 1613
Re: CSV Leaks
« Reply #1 on: March 29, 2017, 03:15:41 »
I have had success with using lapping compound on the pintle and seat. Steady pressure while spinning the pintle. You can also add a stiffer/new spring as they do loose their tension over time. Just not so stiff as to keep the solenoid from doing its job.
You can even install a small o-ring over the sealing surface of the pintle. It works well but have never tested for how long.
1968 (67) 250sl. 4 speed manual. DB180 Silver
1955 220 Cabriolet A. White Grey
2019 E450 Wagon. Majestic Blue
1936 Ford PU Flathead V8. Creme on tan interior.
1989 Volkswagen T3 Westfailia Campmobile. Dove Grey (blue)

RonDwyer

  • Guest
Re: CSV Leaks
« Reply #2 on: March 29, 2017, 03:58:08 »
How did you manage to hold on to the pintle while doing this?  I like where this is going as the assembly did not look bad.  The spring was not something I thought about. 

Tyler S

  • Associate Member
  • Platinum
  • ******
  • USA, CA, Encinitas
  • Posts: 1613
Re: CSV Leaks
« Reply #3 on: March 29, 2017, 20:08:29 »
To access and remove the pintle, you need to remove the fuel line and fitting from the bottom. Then the pintle and spring can be removed. Put some compound on the mating surface of the pintle and put it back in the housing. Use long needle nose or even tweezers to spin it. It is definately easier to do off the car so you can see what your doing. The little package of red polishing paste that comes in "dremmel" tool bits works great.
« Last Edit: March 29, 2017, 20:27:55 by Tyler S. »
1968 (67) 250sl. 4 speed manual. DB180 Silver
1955 220 Cabriolet A. White Grey
2019 E450 Wagon. Majestic Blue
1936 Ford PU Flathead V8. Creme on tan interior.
1989 Volkswagen T3 Westfailia Campmobile. Dove Grey (blue)

enriquegarcia

  • Full Member
  • Junior Level
  • *
  • USA, NC, Arapahoe
  • Posts: 32
Re: CSV Leaks
« Reply #4 on: March 31, 2017, 20:38:17 »
My CSV was leaking and the lapping trick fixed it. To spin the pintle I attached a small piece of flexible rubber tubing to its back end (where spring seats), chucked the tubing in a power drill and spun it in its seat with metal polishing compound while applying light pressure. Worked great!

Benz Dr.

  • Vendor
  • Platinum
  • ******
  • Canada, ON, Port Lambton
  • Posts: 7219
  • Benz Dr.
Re: CSV Leaks
« Reply #5 on: March 31, 2017, 21:03:36 »
I think the main thing to remember here is that less is more. Just a light touch is often all you need.
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC

RonDwyer

  • Guest
Re: CSV Leaks
« Reply #6 on: April 01, 2017, 01:30:59 »
I am going to try just enough pressure spinning the hose between my palms, I like the hose trick.  Just need to find a tighter spring now. 

RonDwyer

  • Guest
Re: CSV Leaks
« Reply #7 on: April 07, 2017, 00:15:00 »
I managed to fix it with a little tighter spring from the hardware store and lapping with some valve lapping compound.  Now on to adjust the WRD.
I have 5 extra springs if anyone needs one  ;D

Andrew C

  • Guest
Re: CSV Leaks
« Reply #8 on: April 15, 2017, 14:49:51 »
I used a short piece of rubber that fitted tight on the pintle, applied Silvo and spun it in the drill several times whilst pushing in and out.  Take a strong magnifying glass and inspect the pintle and seat. When it's perfect reassemble it.  Pull the spring longer.  When you've got it right it shouldn't leak a drop.  I've done a few.

RonDwyer

  • Guest
Re: CSV Leaks - Spring
« Reply #9 on: April 15, 2017, 17:11:40 »
I used a heavier spring C-556 from www.centuryspring.com and it is completely dry now.  5/16 x 5/5 x 0.26