Author Topic: pump lubrication  (Read 1185 times)


  • Full Member
  • Platinum
  • ******
  • USA, CA, Corona
  • Posts: 1426
pump lubrication
« on: October 16, 2022, 04:37:49 »
I am about to start my engine for the first time after rebuild. Its a 250sl motor with R18 pump. I know that motor normally lubricates the injection pump. Since everything was completely dry, is it necessary or recommended to add some oil to the pump direct prior to start up?   

Thank you
66 230 SL
70 280 SEL
53 CHEVY 3100
18 C300 COUPE


  • Full Member
  • Gold
  • *****
  • United Kingdom, England, MALDON
  • Posts: 827
Re: pump lubrication
« Reply #1 on: October 16, 2022, 11:31:11 »
Hello Dirk, i've read up on these pumps and most of it goes right over my head

However, it seems the earlier pumps have their own oil reservois, as well as taking an oil feed from the engine, these two links explain it quite well.  It doesn't say whether oil should be added if the car has not been started for a while, but reading other posts about starting long resting engines doesn't indicate that this is needed, perhaps someone with more knowledge could chime in and advise. The 2nd link is the only picture i could find of where the oil dipstick is located

February 1965 230SL Automatic
UK delivered RHD
Papyrus white, blue hard top & hub caps
Blue soft top
Blue leather

Benz Dr.

  • Vendor
  • Platinum
  • ******
  • Canada, ON, Port Lambton
  • Posts: 7181
  • Benz Dr.
Re: pump lubrication
« Reply #2 on: October 16, 2022, 17:41:32 »
Check the oil level on the IP using the dip stick and add a little bit if needed.

Remove the spark plugs, add a bit of oil to each cylinder, and then spin the engine over with the starter until you see oil pressure on your gauge. I use water in the cooling system until I'm satisfied that I have no leaks; internal or external. Ordinary water will evaporate - anti freeze, not so much.
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