Author Topic: Oil dripping from injection pump airfilter  (Read 2743 times)

lagolag

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Oil dripping from injection pump airfilter
« on: June 19, 2022, 16:59:50 »
I have oil dripping from the airfilter on the fuel injection pump on my 230SL and it causing nasty marks on my parkway so I need to stop this some  way.

I have searched/read trough several Injection pump treads here and can see that the leakage comes from a bad sealing in the injection pump that should probit engine oil to go in to the injection pump oil resouvar and the only way to solve this is to have the pump serviced, a costly job as I’ve understood.

Now to my question, my engine runs well and the car drives well, what can happen if I don’t do the service on the injection pump apart from getting oil stain on the ground?

I made a intermediate solution to get rid of the dripping oil, I collect it to a container outside the pump that has a capacity of about 0,4l that I can drain manually from time to time, it ought to last for at least 1000km.

230SL 1967 since July 2021
SL55 AMG 2003 since July 2008
Suzuki Cappuccino 1995 since May 2006, Sold

ejboyd5

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Re: Oil dripping from injection pump airfilter
« Reply #1 on: June 19, 2022, 23:04:06 »
Your choice: Pay for the repair or continue to use a drip pan for free.  Just be sure that the pump continues to be lubricated. As an aside, it appears that anything approaching 0,4 liters/1000km through the pump is wildly excessive and bespeaks of a major problem that should be addressed.

MartinK

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Re: Oil dripping from injection pump airfilter
« Reply #2 on: June 20, 2022, 06:00:06 »
In my opinion the pump is completely dead and there should be no discussion what to do! The pump should be repaired. All the best, Martin

lagolag

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Re: Oil dripping from injection pump airfilter
« Reply #3 on: June 20, 2022, 10:42:19 »
Of cause I will do the rebuild but I would like to wait until I park the car for the winter.

I have to correct myself, the leakage is from the oil resouvar filling cap, see picture.
The dripping oil shows where the red ring is.
The dripping oil is very black so I think it could be positive that the old oil is pressed out buy the new oil as I recently did the engine oil change and the dip stick shows the clear oil.
And a picture of the dripping aid solution :)
230SL 1967 since July 2021
SL55 AMG 2003 since July 2008
Suzuki Cappuccino 1995 since May 2006, Sold

Benz Dr.

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Re: Oil dripping from injection pump airfilter
« Reply #4 on: June 20, 2022, 16:43:51 »
By the time anything starts to overflow out of the oil filler cap, the IP crankcase would be more than half full of gasoline. Not only will this affect the governors inside the back of the pump, it will also cause all of those moving parts to wear, especially the stylus that follows the three dimensional cam. All of these parts are supposed to run in engine oil and gasoline has very little lubricating value.

Best to get it fixed now before you do any damage which will only cost more to fix. This is not one of those limp home down the side of the road situations.
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

lagolag

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Re: Oil dripping from injection pump airfilter
« Reply #5 on: June 22, 2022, 13:00:14 »
Thanks all for your input.

Today I pumped 0,9l out of the IP which should only contain a maximum of 0.25l so it is well lubricated and yes it smells of petrol!
I am fully aware of the petrol's poor lubrication effect, so now that I have pumped out old oil/fuel and filled it with new oil, the pump should not be damaged more than if I did nothing.
I have found a company that can service the pump locally where I live at an acceptable price, so the service will be done during coming winter.

Regards Lars
230SL 1967 since July 2021
SL55 AMG 2003 since July 2008
Suzuki Cappuccino 1995 since May 2006, Sold