Hi
My car is 1985 300D Turbo

Recently when turning off the ignition switch, it takes about 10-15 seconds for the car to shut down.

By inspecting the vacuum hose of the shutoff valve behind the IP, I noticed the rubber tubing was worn out (fattened out?). So I replaced a new section of the rubber vacuum hose. Now the car can shut off right away.

However, the old section of the hose has some oil in it, is that something I have to worry about.

Thank you

Yes. It's indicative of a tear in the shut off diaphragm. Could be residual oil from a tear in a previous diaphragm if your current diaphragm seems to be functioning fine.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

^^Yeah, maybe.

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83 SD

84 CD

So with presence of oil there, does that mean the shutoff valve will fail any moment from now?

No. And a bad shut off valve is not a major problem. You can just push the stop lever when it fails.
It's better not to have oil in your vacuum lines.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Ruptured Diaphragm allows Vacuum pump to pull Lubricating Oil up to the Vacuum portion of the Ignition Switch and Beyond...Put a Mighty Vac directly
on the shut off valve nipple...Does the Shut Off Valve hold a Vacuum? If not
replace it.

__________________
'84 300SD sold
124.128

I had oil in my line, I replaced the shut off valve, and now the car stops with the key.

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83 SD

84 CD

Yes, replace the shutoff actuator. It takes 30 minutes, and you need two part number 001 074 20 80 gaskets.

I had a question about this because I just found that my shutoff actuator doesn't hold a vacuum. Shouldn't it only suck oil through the lines when the key is in the off position? If that's the case, wouldn't it only draw oil from the IP for a few moments while the engine is shutting down? After the vacuum pump stops pumping, there's no residual vacuum in those lines...is that incorrect? Also, someone mentioned that the brake booster can fill up with oil...how does it get in there? Shouldn't it flow towards the vacuum pump when it hits the main vacuum line?
Really just curiosity questions...won't reallly solve anything

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1985 300TD-euro 352,000 mi
1974 240D (1?)52,000 mi - has a new home now

Brake fluid can leak into the booster due to a failed seal on the MC shaft.
If you are "missing" fluid, and can't otherwise locate a leak, check there.
You can unbolt the MC from the booster easily.

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83 SD

84 CD

As far as the brake booster. That can fill with brake fluid from a leaking master cylinder. That brake fluid can end up in the engine oil if left to collect too high in the booster. I've never heard of the engine oil backtracking the vacuum line and ending up in the booster.

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Chad
2006 Nissan Pathfinder LE
1998 Acura 3.0 CL
OBK#44
"Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.)

SOLD
1985 300TD - Red Dragon
1986 300SDL - Coda
1991 - 300TE
1995 - E320
1985 300CD - Gladys

Geez...I thought for sure I had just read a thread (looking into shutoff valves) where someone had said that they saw oil drip ontheir leg and it came from the ignition switch and someone else mentioned it getting into the MC. I thought it sounded strange, now I can't find it...of courese.

Well, its not worth getting the thread off course...but I can see that if the shutoff valve is bad that the engine will run for longer until it shuts off, all the while the oil is working its way up the brown vacuum line.

__________________
1985 300TD-euro 352,000 mi
1974 240D (1?)52,000 mi - has a new home now