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-   Porsche 924/944/968 Technical Forum (http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/)
-   -   Peek into the depths of the engine: pics + a few questions (http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/259458-peek-into-depths-engine-pics-few-questions.html)

seaboltman 01-05-2006 04:38 PM

Peek into the depths of the engine: pics + a few questions
 
Hey guys, I just got done taking apart the engine today. About 5 hours of work got the block just about stripped. When I got the head off, I was surprised at the condition of the cylinder walls. They were immaculate. The pistons had a bit of buildup on them, but that can be taken care of. And on top of that, I only lost 1 bolt, and one washer. Don't remember where the washer was from, but the bolt was one of the cam cover bolts, so i'm going to have to track down that. Pretty good for me since I usualy lose 2-3 doing small projects. Theres alot to be said for using plastic bags to hold bolts.

I only had 2 goof ups.One goof up came when I put a screw driver in the #1 cylinder to help me while spinning the crank to get the engine to TDC. I forgot it was in there, and i jammed it got jammed into the piston, and left a gash! Danm it! The other is a bigger one, and i'm going to need some help as to what to do. I got the engine to TDC (while the screwdriver was still in the spark plug hole) and I took off the timing belt. When I remembered that the screwdriver was in there, and tried to get it out, I moved the flywheel instead of the crank pulley to get the crank to turn. I lined up the "OT" mark with the casting line but i'm not sure what needs to be done now. I put the engine back at TDC, and I would assume theres no harm done correct, the cam and the crank will be lined up?

Other than that Since I've never had experience with cleaning pistons, what procedures should I take to get the carbon build up off? What about the gash that I put on the #1 piston?

I took this motor apart so I could re gasket the whole thing while it was out of the car, but what else should I do while i'm in there? I'm thinking the piston rings would be worth it, and maybe the rod bearings, but thats it. Anyone have any suggestions? Thanks for whatever help you give me. Now for the pictures

Look at the Cylinder Walls... I cant find any imperfections:
http://forums.pelicanparts.com/uploa...1136509984.jpg
Another Shot: http://forums.pelicanparts.com/uploa...1136510058.jpg
eww, carbon buildup: http://forums.pelicanparts.com/uploa...1136510168.jpg

AFJuvat 01-05-2006 05:00 PM

Gash in the pistons - no worries. Use carb cleaner and a bronze brush to remove the carbom
Since you have the motor out of the car, you can do it all - rings and bearings pretty easily.

Congrats on your first teardown

AFJ

fierochris 01-05-2006 05:09 PM

Would this be you 86' or 87' 944's motor?

seaboltman 01-05-2006 05:41 PM

this is the 87, the 86 motor was traded for an 83 that had a no motor, and a bad interior. This motor will go in the 83, and then Ill do the interior.

fierochris 01-05-2006 06:10 PM

do you have any 944 manual tranny parts?
im looking into converting my auto into a manual.

ae1969 01-05-2006 07:44 PM

Looks pretty. :D

That gash on the piston.......if its really bad you can sand/file any grooves down a little. Its more of a problem on turbos in creating a hot spot that may cause detonation but otherwise all looks good.

In case you are wondering don't touch the cylinder walls ............even if your buddy next door says that you should remove the glaze with a hone. Just nod your head and ignore him.

When you are done cleaning the pistons........... coat the walls with a little oil and turn the crank over a few times.......... As the piston rings push any residue/dirt that may have fallen down the sides to the top...... you can then wipe it off. But on that note try not to be too messy when you do clean it.

nynor 01-05-2006 08:38 PM

perfect cylinder walls?

don't you love these 944 engines? when i pulled the head on my '83, i found the same thing. my cylinder walls were perfect, no visible wear whatsoever.

seaboltman 01-06-2006 03:56 AM

Quote:

Originally posted by nynor
perfect cylinder walls?

don't you love these 944 engines? when i pulled the head on my '83, i found the same thing. my cylinder walls were perfect, no visible wear whatsoever.

yep, its pretty cool. Anyone else have anything to say about the rings/bearings question?

ae1969 01-06-2006 07:59 AM

Quote:

Originally posted by seaboltman
yep, its pretty cool. Anyone else have anything to say about the rings/bearings question?
If this car is pushing 200K. I would do the rod bearings...... The rings themselves is a toss up. If you were to measure that bore you would probably find it a little out of round and tapered. A new set of rings would not hurt but then you start asking yourself........how about the main bearings etc... So if you open that can of worms you are going to slide down a pretty slippery slope.

seaboltman 01-06-2006 08:24 AM

hum, well the engine has just over 120k, and seeing as how I plan on using a turbo motor anyway, I'll wait. The engine had no problems when I drove it around 2 years ago, might as well not give it a reason to get messed up.

seaboltman 01-06-2006 08:35 AM

Oh, when i wire brush the pistons, Should i remove them, or should I just raise them up and wirebrush them when they are flat with the block?

sasquatch 01-06-2006 06:54 PM

Geez, your that far allready, why not pull the crank and pistons, hot tank everything, put new rods and main bearing in it and a fresh set of rings? Probably another $200 tops and you have essentially a new motor. It will be all clean and shiny as well. New full set of gaskets and seals, and it will be good for another 120k miles.


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