Need a little help to identify my engine

[dvcarrporsche]

I'm looking for a little help- I just picked up this 82 911SC that has some engine problems, and I'm just diagnosing the engine now. I got the car for a reasonable price because it has a lot of new expensive parts installed, interior, wheels, suspension etc. But areas of this car are really hacked up like a poor paintjob, messed up wiring, etc.

I'm trying to identify what type of engine is in the car, the engine does not appear to be original. Next to the fan shroud is the number; 64C2708 and I cannot locate any info in my manuals on how to decode the engine code. Is there another place on the engine that would tell me what kind of motor I have in this thing? I'm starting to question if I have a 3.0 in this car as well, how can I tell?

[James Brown]

That code, 64C2708, is for a 1982 (930/16) 3.0

[Grady Clay]

64C2708

Decodes as:
6 = Unit type: 6-cylinder engine.
4 = 911SC - USA.
C = Model year 1982.
2708 = Serial number.

There is a 'Type Number' just to the right and forward of the engine number. it is stamped 'down' into the crankcase just inboard of the chain housing and behind the oil pressure sender.

It should be 930/16.

Best,
Grady

[James Brown]

We nailed that one

[dvcarrporsche]

Wow- set my mind at ease with your responses, thanks so much folks!!. I did not know about the number behind the oil sender. With a lot of parts on this car being hacked, I was getting a little worried about the motor. The engine in this car is clearly rebuilt, the previous owner was driving the car but it had no power. After buying the car, and looking into the engine components, most everything bolted to the engine looks practically new and engine cases are way too clean for having 130k miles, except #6 cylinder is dead, zero compression. I have 150-165lbs compression in the other cylinders. The engine is painted red, and I was thinking that this could be a Motormeister rebuild as well.
Has new exhaust system, all new CIS system, kinda strange that one cylinder has no compression. I'm more familiar with 356's, this would be my first tear down of a 911 motor, so it looks like fun.
Now that I'm sure I have the right engine thanks to you folks, once I get the motor running better, I plan on stripping her down, and repainting her to Iris Blue Met. Someone had the body apart to paint her red, and did a terrible job refitting everything.

Does anyone have any thoughts about a zero compression? I'm pulling the valve covers now to see if I have a broken valve spring, or rocker. So far the intake looks good, exhaust next.

[snbush67]

Could it be as easy as your valves are adjusted poorly? Lets hope it is that easy, or simply some carbon in the seat. Going a little deeper it could be a bent valve, or worst case I think is that the rings are bad.

It seems more likely it is an issue with the valve opening.

I hope it is something simple.

Shane

[Grady Clay]

I am deficient:
WELCOME to the Forum
You will find a lot of help here.

Do a cylinder leak test on your dead cylinder. This will give you more clues than a cranking compression test.

Listen for escaping air in the intake (intake valve), exhaust (exhaust valve), oil filler (rings) and between the head and cylinder (head seal).

It is tradition for new members to post an image of your 911. Lots of detail images of the worst will let us offer suggestions.

What 356s?
Some of us have or have had a few.
Mine have ranged between a ’52 coupe and two ’64 2000GS Cabriolets.

Again – a warm WELCOME.

Best,
Grady

[James Brown]

what is the bet it's a head stud ?

[dvcarrporsche]

Thanks so much for the warm welcome- Yes- cylinder leak down test is my next step. I would think that a bad head stud, or bad rings would give me some compression, who knows, this could be easy or hard. I think if it was easy, it would be fixed long ago, but you never know. I figure that I'd try the obvious and pull the valve covers to ensure that the valves are functional. The previous owner was driving the car, so if there is any damage, its already been done. Engine oil pressure is great, and I hear no funny noises. I suspect that someone thought it may have been a fuel injection problem and replaced everything before they diagnosed a dead cylinder.

I've been following Pelican on and off for years, I also look at the forums from time to time. I've owned many 911's, but its been 5 or so years years and I've have been Porsche free- and thats wayy too long.

A few months ago I started looking for a car that needed some TLC, and I came across this 82 SC Targa. I have a bunch of pics, once I figure out how to post pics I'll throw some up. Currently, she's guards red, but was painted several times in its life. Its time to strip her do bare metal and start from scratch. Iris Blue is my favorite color, so thats it.

I restored a couple of 1960 356s, one red normal car, and the other a Oslo Blue Super, but those are long gone. I'm currently involved in a restoration of a 59 Triumph TR3a, and a 66 Jag E-Type coupe, I'll most likely end up keeping the Tr3a as a retirement car, and I'm still searching for a 66 E-Type roadster to restore!. So as you can see, I like to get into car trouble!! But my true love for cars is to drive are 911's, and I'm looking to make my SC a nice daily driver. I can't wait but it will take several months to make this car right.