924Board.org

[NikDev]

Found a brown spot under car, its oil:



Its dripping from the right mount to the front sway bar,:



WHY?
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x79 924

[Chrenan]

Are you sure it is oil? It might be coolant mixed with road grime from the underside of your car. In the first picture it looks greenish like coolant. Smell it, coolant has a sweet smell. There is nothing above the right mount for the front sway bar that could be leaking oil that I know of. However, the rad sits above the sway bar, as do a few connections to the rad on that side of the car that could be sources of the leak.
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1987 951 - M193 Version for Japan

[WhoDak]

That's not oil, that's headlight fluid, it's sorta like the brakelight fluid on mine that I need to top off every once in a while . Ok, just kidding. Check your air filter box to see if it's getting oil pushed into it.
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Mike
'82 924 N/A
'91 Toyota Pickup SR5 4x4 Xtra cab

[Paul]

Or your A/C compressor or hoses....
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

[Chrenan]

Doesn't the AC run off a second v-belt on the oil pump pulley? Looks like there is only one v-belt coming off his oil pump pulley, meaning no AC. I could be out to left field on this one though.
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1987 951 - M193 Version for Japan

[Paul]

Good eye! No belt pulley no A/C!
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

[Ozzie]

[NikDev]

[Ozzie]

Just in front of the window for the flywheel and behind the engine mount there is a 20mm hose going from the crankcase breather on the engine block to the air box.
This is supposed to have an orifice which gets blocked or disintegrates.
If it disintegrates the vacuum will draw more air than necessary from the crankcase, including oil and oil vapor.
If your air filter is blocked it can do the same thing.
On euro cars the hose connects to the join in the boots.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[NikDev]

Problem found: Thanks Ozzie!



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x79 924

[Ozzie]

That connects to a tee going to your brake booster.
Dont know why its blocked off.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[NikDev]

I opened the air filter box while the car was idling, and a lot of oil vapor came in, I then tryed block the hole where it came and immediately the oil started coming out for where the dipstick is.

I have talked to a friend of mine (old 924 owner) who probably thought i had blown a cylinder, or mybe a cylinder gasket, etc



What do you think?
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x79 924

[gohim]

The hose that you blocked is the crankcase breather. It is supposed to be there to vent the small amount of contaminated air from the crankcase that escapes from the combustion chamber past the piston rings, valves, and valve stem seals into the crankcase as a normal part of the combustion process. It is piped into the aircleaner so the crancase does not become pressurized and the contaminated air is directed into the air cleaner to be returned to the combustion chambers to be reburned (and cleaned), instead of vented into the atmosphere as polution.

Some oil will accumulate in the bottom of the air cleaner as a normal result of the process. Excessive oil dripping constantly is a sign that something is wrong. If you block the breather hose and large quantities of oil is blown out of your dipstick hole, what you have is an indication of: worn pistons rings, and/worn valves, and/or worn valve stem seals, and an engine that needs some corrective action.

[NikDev]

[gohim]

Oops, forgot to include worn valve guides.

The valve guides that Audi installed on most 924 engines (yes Audi built the engines too) were a bronze composition that was too soft and wore excessively. Wornout valve guides are the first components that I would suspect.

It is possible that all your car needs is valve guide replacement, which is relatively cheap (cheaper than pulling the whole engine).

Luckily superior quality replacement phosphor bronze valve guides for the 924 engine are inexpensive. This is one of the engine components that you are better off NOT BUYING FROM PORSCHE.

Valves are relatively inexpensive as well. You should expect some of them (valves) to require replacement as well.

Unlike other Porsche engines, the 924's cylinder heads can be serviced by a normal machine shop using conventional methods and procedures. If you decide to remove and replace the cylinder head yourself to save the labor (here in the US, mechanics charge about 8 hours labor to remove and replace the cylinder head, it take me about 2.5-3 hours to remove and replace), make sure that you keep the lifters in order so you reinstall them in the same locations that they came from. And MAKE SURE THAT YOU CHECK AND ADJUST THE VALVE CLEARANCE. You will probably need to replace some of the adjustment screws that fit in the lifters after some of the valves get replaced by the machine shop.