Author Topic: Injection Pump Leaking from Inspection Plate  (Read 3014 times)

71Blue280SL

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Injection Pump Leaking from Inspection Plate
« on: September 24, 2014, 14:59:26 »
My '71 is running great, but oil is leaking from the bottom corners of the inspection plate.  I pulled it off, put gasket seal on both sides, and reinstalled.  I let the gasket sit for a day, and it did not leak on the next run.  However, it has started leaking again from the front lower corner of the plate.

My engine has less than 1000 miles on it since being rebuilt (and the pump replaced) and it started leaking about 500 miles after the rebuild.  Is the IP getting too much oil pressure?  The leak is big enough that you can see the flow of oil dripping off the IP.

On another thread, a member kindly pointed out the drain hole in the gear on the forward part of the pump.  If it got clogged, is there a way I can check without removing the pump?

What else could be causing the leak?

The car runs great, and the leaked oil does not smell like gas.

Thanks. Huh

vande17941

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Re: Injection Pump Leaking from Inspection Plate
« Reply #1 on: September 28, 2014, 08:44:38 »
Mine has a leak also. Are you calling the "inspection plate" the rear plate where the mixture may be adjusted with the thumbscrew?
'66 USA (1967 model Year) 230sl, 4-speed Manual, Driven Like a Real Car! Set up with KYB Stiffer Shocks, and Motor Mounts w Urethane Inserts Underneath, 3-point Belts, Headrests Installed 🚗

1986 560sl Cabernet & Palomino (not recommended)

2001 SLK320 Sport AMG Silver & Black

vande17941

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Re: Injection Pump Leaking from Inspection Plate
« Reply #2 on: April 09, 2015, 01:27:40 »
I thought mine was leaking from the same spot. Then, Pacific asked me to check something first...it was actually oil working it's way through the solenoid and leaking out the terminal end.  They said the only fix known is to remove it and use epoxy to seal it up on the internal end....since the solenoids are no longer available and used are $700+
'66 USA (1967 model Year) 230sl, 4-speed Manual, Driven Like a Real Car! Set up with KYB Stiffer Shocks, and Motor Mounts w Urethane Inserts Underneath, 3-point Belts, Headrests Installed 🚗

1986 560sl Cabernet & Palomino (not recommended)

2001 SLK320 Sport AMG Silver & Black