Engine Block Port Question

[kevinbly]

Putting together 951 engine after rebuild . . .

There is a small port that looks like an oil return port on the engine block, lower rear drivers side of the engine, just below the Oil Separator / Fill Tube. Does anyone know what this is for?

It has been almost a year since I took this thing apart, and my memory is failing me now . . .

Any help would be greatly appreciated.

Thanks in advance!

Kevin B
- '87 951
- '02 Boxster 'S'

[Johns944TS]

I believe the Oil Separator connects to the block in 2 places, upper and lower holes in the side of the block. There's another hole down there that accepts the dip stick tube. Could that be the one you're looking at?

[kevinbly]

Nope, dipstick is already installed. It is almost directly under the oil separator/fill tube assembly.

[Johns944TS]

Hmm - I have 2 engines on my garage floor, a 2.5 and a 3.0. Looked at both where the Oil Separator/filler plugs into the side of the block. Just behind the lower hole is a boss that is machined on the outside and looks like it is drilled on the inside. It looks like something ought to fit in there. But if I get down on my knees and peer into the hole, it doesn't seem to go anywhere. It seems to be blocked inside. Is that what you're referring to? If so, I don't know what it's purpose is, but I don't think anything connects to it.

[kevinbly]

Here is a picture of the port in question. It appears to be drilled through.

[Johns944TS]

I forwarded your pic to Wes at Lindsey Racing. He says "nothing goes there thats a boss used during machining of the block".

[kevinbly]

Thanks for your help. I really appreciate it. . .

Kevin