The timing is not nearly as critical as on diesel engines. The injection pump timing on the gasoline engines should not be tampered with under normal conditions. "Joe Alexander says: experimenting with the fuel injection by the unexperienced is risky. Overfill interferes with the fly-weights at higher rpm fuel metering."Īnd here's some good information contributed earlier by Joe Alexander and Pete Lesler on injection pump timing/adjustment: I will replace fluid in through the top cap and keep checking the T-bar dipstick for a fill level as I go. I would say that this was a little overfilled, no? What problems could this overfilled state have caused? Have others found this problem on their cars as well? Once again, if this helps anyone identify how much oil I should put in, my F.I. The squirter pump went dry after pumping out 18oz (53 ml) into the bottle. This was not simple due to cramped spacing and I would recommend the siphon method for others. I removed the top cap (mine's metal, not red plastic) and began using the pump method. When it stopped, there was a puddle on the floor about 12 inches (30 cm) in diameter. It was oil running out of the now open hole. After removing the dipstick I began to clean it. I got the dip stick out with a screwdriver (no bolt edges, just a screwdriver slot and T-bar). Where did you syphon from, the small dip stick hole or the larger hole on top of the pump? Which hole did you refill through? Do you recall how much you put back in? I haven't removed the dip stick yet, is it accurate right off the bat, or do you have to run the car and measure again? Can you tell I haven't done this before? I'm always nervous messing with something for the first time. The red plastic cap simply replaced the metal cap of the earlier version. Maybe someone else can shed some light on this. The hole size there was 7 mm (on my car). I put the oil in the hole under the red cap or where the red cap should be. I'll bet there's sludge and junk in the bottom of the housing that the spray bottle pump will not remove. So, you put the oil in through the dip stick bolt hole (7mm) instead of the large hole under the (red) cap on top? It's a shame you can't drain the oil out the bottom. I will try the 14mm box end wrench for the dip stick bolt and the spray bottle tool for oil removal. I don't have a red cap on top of the pump, but I do have a metal cap that's about 20-25mm across. The OD of the small end funner has to be 7 mm. You will need a very small funnel to add new oil to the injection pump. I am currently using 20 W 50 in the crankcase and the same in the injection pump. Maybe the red cap has been replaced with something else as in my case. On the top rear is a red cap with access to remove and add oil. I used a window cleaner bottle pump to remove the oil from the injector pump. Pete Lesler: the fuel injection pump on the 250 SL also used a oil dip stick and a red oil filler cap. There is a small cross-section steel line that comes from there and goes to the right side of the injection pump body. Will: best way to tell if there is an oil supply to the injection pump is to look at the left side of the block near the front. Measuring the oil taken out and keeping and eye on the dipstick, it turned out to be a relatively easy task. To replace the oil you need a very small funnel. I thought it might of had a slight gasoline smell but the oil didn't look diluted. Using a window cleaner bottle pump, I was able to pump out 130 ml of old oil. The nut had a screwdriver slot on the top. Instead of the T-shaped dipstick, my dipstick was on the end of a 14 mm nut. I changed the oil in my 230 SL fuel injection pump. I could not loosen it with a screwdriver, use a 14 mm socket. Took me 7 years looking at the diagrams to figure it out. I assume they put a bolt in it's place with a nut to lock it so it would not leak/loosen. Any insights as to why this slotted nut is where the dip stick should be. Where my injection pump dip stick should be is a 14 mm nut with a slotted top. Maybe others can add to this to answer your questions more specifically: Ben - here's some of what was in the first 3,000 Yahoo posts on the topic of oil supply for the FI pump.
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