My ongoing UGLY ENGINE CLEANUP thread

[Gogar]

With the help of some very nice new friends a while back, I got my dirty, nasty, stinky engine out of my car for cleanup/ leak fixin', powder-coating fun. I just wanted to start a thread and show some of my pics and ask questions and get advice from anyone who has a look. I've been doing a lot of reading and I'm going pretty slow. I've been doing a lot of cleaning and I'm just about ready to get parts back from powdercoating and put stuff back together and do seals and gaskets and return tubes and yadda yadda.

One thing I should have done was hosed it off BEFORE I started taking crap off. Live and learn. All the cleaning has been by hand with a scotch brite and brake cleaner and carb cleaner and degreaser and stuff. I won't be getting anywhere near this thing with a hose now.

If you see something troubling along the way, please let me know.

I had fun taking this messy thing apart.



I tried for quite some time to get the injectors out, and after I realized I didn't really have to, I gave up for now. The injectors on a 73.5 CIS motor are not a part of the intake runner, so I didn't have to take them out to send the runners to powdercoat.

Taking the CIS off was fun, there were some things that WERE NOT hooked up.

What's this that wasn't hooked up, right on the back of the CIS?



Funny, the standoff/bracket that goes up from the throttle linkage plate and holds the whole CIS system steady - was just lying on top of the engine



Here's a question: at about 2PM on this fan shroud there's a hole that looks like it wants to have an air line hooked up to it. Should it - and where does the other end go?




Thanks in advance!!!!!! All the pics from here on should be PRETTY. VERY PRETTY.

[Poor-sche Lover]

The electrical plug is your cold-start valve, I think. I don't know about the hole in the shroud.

[HarryD]

I would guess that the hole at 2 o'clock is to supply air to the carbon canister as part of the evaporative emmisions control system.

This is how it is hooked in (assuming it is a 73.5):


© Dr. Ing. h.c. F. Porsche A.G.

1. Expansion Chamber
2. Vent Chamber
3. Activated charcoal container
4. Engine fan upper shrouding
5. Pressure line from fan to activated charcoal container
6. Purging line from activated charcoal container to engine air cleaner.



For a bit later car, the setup looks like this:


© Dr. Ing. h.c. F. Porsche A.G.


1 – Fuel tank
2 – Expansion chamber
3 – Activated charcoal filter
4 – Cooling fan upper shroud with hose connector
5 – Hose from cooling fan to activated charcoal filter
6 – Hose from activated charcoal filter to engine air filter
7 – Engine air filter
8 – Return hose connecting fuel tank with expansion chamber



thanks Grady! tank ventilation-MFI diagrams

[Gogar]

Wow that's a great thread Harry! I think I missed it because I was searching for something to hook up to the CIS instead of the canister stuff.

None of my canister stuff was hooked up, the lines were just hanging there. I'm probably going to get it out of there.

[HarryD]

Originally Posted by Gogar

Wow that's a great thread Harry! I think I missed it because I was searching for something to hook up to the CIS instead of the canister stuff.

None of my canister stuff was hooked up, the lines were just hanging there. I'm probably going to get it out of there.

Gogar:

Errr.. don't do that...

Your gas tank will need to vent gasoline fumes (when filling or as the tank naturally "breathes"). The vapor system is there to keep YOU from breathing them or accidentally setting your car on fire.

[Gogar]

Ok errr . . . I guess that was just an ASSumption of mine. There sure are a lot of "canister removal" threads out there.

Is there a proper way to vent the tank -without- using the complete charcoal canister system? Mine was purposely disconnected by -someone.

Thank you!

[greg bradbury]

If the plug at the is at the back of the CIS body I think you will find that it is the cut off connection so that the fuel pump only runs if the engine is running. If its disconnected the pump will run all the time which is not the best as the risk of a fire is greater.

Regards,
Greg.

[Gogar]

I think "Cold Start Valve" is the
winner.



Greg, I'm wrong a lot, but I'm pretty sure that the fuel pump ran all the time in 73.5.

That connector is similar though, to the one right behind the sensor plate that I think you're talking about, but not on THIS engine.

[HarryD]

Originally Posted by Gogar

I think "Cold Start Valve" is the
winner.



Greg, I'm wrong a lot, but I'm pretty sure that the fuel pump ran all the time in 73.5.

That connector is similar though, to the one right behind the sensor plate that I think you're talking about, but not on THIS engine.

My fuel pump always runs.

[HarryD]

Originally Posted by Gogar

Ok errr . . . I guess that was just an ASSumption of mine. There sure are a lot of "canister removal" threads out there.

Is there a proper way to vent the tank -without- using the complete charcoal canister system? Mine was purposely disconnected by -someone.

Thank you!

Gogar,

You are correct. See what the guys with the Fuel Cells do.

[RWebb]

Originally Posted by Gogar

Is there a proper way to vent the tank -without- using the complete charcoal canister system? Mine was purposely disconnected by -someone.

Thank you!

- not really

- if you do rip it out, I'll be glad to take it off your hands

[HarryD]

Try this thread for some ideas: http://forums.pelicanparts.com/porsche-911-technical-forum/299053-tank-ventilation-mfi-diagrams-post2760216.html?highlight=fuel+tank+vent#post2760216

[Winter]

I missed the engine drop, but my offer to try to be on hand for the reinstall still stands depending upon my work schedule. Cool thread, keep me posted.

---

Tom '75 Targa ("stinky")

[Gogar]

Thanks for the info, you guys. Maybe I should keep it in there and hook it up correctly or something.

Here's some more interesting stuff:

Do I NOT have an "idiot light" switch up here:



Because it's HERE:




Also: Can someone tell me about these OIL RETURN TUBES?



All four tubes were leaking on each end. I was going to take them out with the "SMASH AND BEND AND CUT" method, but a funny thing happened. When I slid the circlip into the middle of each tube and got on it with some vice grips, they came RIGHT OUT. Total time - 10 seconds for each tube.

Are these some kind of older-style collapsible return tube or something?




I was excited to get the tubes out, because 1. I'm going to do the cooling tin mod and 2. I need a little room to get the end of the LONG oil line off.

The big nut is stuck, and the fitting that goes into the case wants to come out with the line. Any suggestions? It's soaking in some PB blaster right now.

[al lkosmal]

gogar,
That's the oil temperature sensor that you're pointing at. The canister like thing above and to the right of it is the oil pressure sender. It appears that there is a bolt installed in the oil pressure switch (idiot light) position.

regards,

Al

[Gogar]

Originally Posted by al lkosmal

gogar,
That's the oil temperature sensor that you're pointing at. The canister like thing above and to the right of it is the oil pressure sender. It appears that there is a bolt installed in the oil pressure switch (idiot light) position.

Okay, thank you. I always get it mixed up in my head with the thermotime switch.

[HarryD]

Originally Posted by Gogar

Thanks for the info, you guys. Maybe I should keep it in there and hook it up correctly or something.

Here's some more interesting stuff:

Do I NOT have an "idiot light" switch up here:



Because it's HERE:

In my 73.5, which looks like that area, there is no idiot light, only oil temperature and pressure. Also, the 73.5 does not have the thermotime sensor.

[Gogar]

Originally Posted by HarryD

Also, the 73.5 does not have the thermotime sensor.

Well I can't imagine what it is then . . . . That's where they go when there is one, right? And thermotime switch is listed in the 69-73 catalog section.

Thanks!

[gsmith660]

+1 that is a thermotime switch since it looks like you have CIS then it is logical that you would have one I guess.

[HarryD]

Originally Posted by gsmith660

+1 that is a thermotime switch since it looks like you have CIS then it is logical that you would have one I guess.

In the 73.5 you use a Hand throttle to start the car and set the idle as the car warms up. Later, Porsche, added the thermotime circuit to eliminate the hand throttle system.

I wonder if Gogar has a later timing chain cover and the thermotime switch is acting as a plug for the hole.

Gogar,

Does you car have a hand throttle between the seats? It looks like the heater lever but is black and will be on the left side of the handbrake.

Also, be aware that the 73.5 engine has some items that are unique to that engine.