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jgerock

Kugelfischer pump leaking oil

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The engine-side of the K-F pump is leaking oil enough for exterior grime accumulation. Engine has 150K, but the pump doesn't seem to be leaking fuel and I'm getting good MPG. Short of a rebuild, is there anything I can do to stop the leak(s)?

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Jim,

I really wouldnt worry about that...

I would clean up the pump a little bit and drive it for a while to see if it is really leaking oil, but I kind of doubt it. It looks just like some grime buildup that is typical from the valve cover breather leaking somewhere. Double check that that small vacuum line from the throttle body to the breather hose is there and the nipple on the hose is inserted properly. Also check the hose to make sure it is not cracked.

KC

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Vacuum hose from valve cover tight. I installed a new valve cover gasket about 6 months ago - no leakage there. The leak appears to be in (2) spots on the pump: at the accelerator linkage arm shaft and at the warm up regulator.

Early on, I had printed out Bill William's post on his trip to see Dave R. in Illinois. Beautiful KF pump and injectors for his Touring; even more impressive in person.

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THIS IS WHAT COMES FROM 35 YEARS of neglect

by many owners, with disregard for oil changes,

quality oil, and alowing deposits and sludge to build up

over many years and 1000's of miles.

Inside of the pump can be sludged up blocking oil return flow out of the pump. Your building up excessive oil inside the pump -

and pressure with sling is forcing it out of the marginal

sealing points.

As suggested above, wash the motor really well. and

reexamine the rate of leakage.

When you had the cam cover off - what was the appearance

of the head - in terms of black deposits ? or spotlessly clean ??

Folks have little to no insite to the internals of the injection pump - being out of site - and relatively trouble free . . . . . . . .

But internal cleanliness is key to it's operation.

might be time for a MARVEL MYSTERY OIL treatment

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Inside of valve cover is spotless! Last time I went thru the valves, all were adjusted within specs. I can feel a pulse on all (4) plastic lines while running.

Based on what info I have, the car sat for a long time, then was re-done between 2000 and 2003. Then on to another owner just before I bought it in 12/06.

PO who rebuilt the engine used a portable CO meter (manifold has 02 sensor bung with cap) to set the injection system.

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More info and pics from yesterday. The small I.D. tag reads: # 2004011 B-1 with "S W 00204" below it. The date code cast mark on the side of the pump looks to be April 72.

Documents that came with the car indicate a spare K-F pump was included with the sale. Is there a significant difference between the 72 and 73 pumps? I know the 74 version is different due to emissions.

The leak point looks to be where the mixture shaft exits the rear of the pump, blowing oil onto the surrounding parts.

I'll clean it up well and keep a close watch on the exact leak point(s).

Many thanks to Rob Torres of 2002Haus for the advice.

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Here is the pump after I removed it today. The aluminum pulley was pretty tough to remove, but I used my aircooled VW puller as leverage to remove it. I'm going to buy a new pulley after the unit is rebuilt.

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Jim, I believe the fuel cones are somewhat different between early-72 (121 head) and late 72/73 (E12 head), but I don't know that it is enough to cause problems. Somewhere I have a diagram of the fuel maps, but I haven't seen them in a while.

I interpret the date code on your pump to be 10/72 (10 dots) which would make it a late pump.

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Two thoughts on K-pump oil leaks:

1) If you are having the pump rebuilt, verify that the front seal will be replaced.

2)Make sure that the leak isn't coming from the front timing covers (maybe a little late for that now!).

I thought there was a recent discussion on this board concerning the different pumps with the conclusion that there was no discernible difference between which was installed.

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Should be receiving my rebuilt KF pump and tested injectors back shortly. After several long discussions with Rob Torres of 2002 Haus, I decided to ship him my pump and injectors. Will post pics after I receive it along with a new pulley and other assorted items.

I will drop off my cylinder head tomorrow to a local machine shop for inspection and then plan on pulling the # 1 piston for closer examination.

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Here's the rebuilt pump after I just finished detailing it. I used satin black trim paint on the cast pump head and Eastwood's Cadmium copy rattle can kit with a shot of cheap clear coat.

I removed some of the small parts to clean then paint them. Not a museum piece, but much better than before. Many thanks to Rob Torres for the assistance!

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