924Board.org

[Grenadiers]

I did open up spark plug on cylinder 1 and stuck a thin dowel rod down it. I turned it until it was at the top of it's path assuming TDC then tried to fire up and blurgh, nothing.


Another way to find TDC, is to remove the oil filler cap. Look in to see the first two valves. When they both are fully closed, take a peek at the cam knotch to see if it's lined up with the pointy thing.
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'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

[GoodCat]

Well now that I'm more knowledgeable at this finding TDC thing, I'm pretty positive I had.

Hey, sometimes a second set of eyes can say a lot. It's not going to car-x now, I found a local specialist shop just down the street here in indianapolis. They seem legit http://www.euromotorworks.com/

It's rare I give up, but I think you are right I'm somehow getting it a tooth off, but no mater how many times I do it, same results. Time to pay someone else to do the same damned thing and for some reason it work. At least then it will work
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1980 Porsche 931

[GoodCat]

well heard back from the shop. Looks like I did infact have the timing belt spot on. (all 15 times I redid it) It was an unrelated starting problem that started at the same time. Hate that stuff! They found a vacumm leak (and a 1/2" gap between turbo manifold and turbo (explaining the extreme boost lag) Thought it was just needing a gasket, but some tightening too!

After fixing the vacuum leak, fired up just fine but is only running on 2 cylinders, so they're checking that out tomorrow, likely an electrical problem. Can't wait to get this boy on the road again!
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1980 Porsche 931

[flosho]

The boost leak at the turbo outlet and charge pipe is a common issue. Take a look in the fs section at ideola's fs thread with the "lower charge tube bracket" and pick one of those up if you are missing yours. This will keep things from separating under boost.
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[This Space For Rent]

[Crux Mason]

same timing deal as Goodcat. I have the upper pulley (oil pump?) lined up with the timing mark and I can find the Z1 through the window, I assume the dash under it lines up with the bottom part of the window that sticks out. If I align that does it mean the bottom pulley (cam shaft?) is in time too? I can kinda see a notch on it but I don't know what it lines up with.

As I mentioned in my thread if you use MSN please add me: cmaynes at mchsi.com

[GoodCat]

Hey crux. The crank notches should be aligned just to get a basic idea and then look through the window to get exact for Z1. If you can see Z1 in the window, it's correct. It is totally out of the window to have the crank one tooth wrong in either direction. Be sure your cam gear is correct first though (dot BEHIND, not on front side) Good luck!
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1980 Porsche 931

[Crux Mason]

Just out there messing with it for a while and the belt never did seem to line up right. On the top it the teeth were either dead on and the belt too loose or the teeth on the pulley and the belt matched right up and it didn't seem to want to go on right. So just to be clear so I don't go crazy, I want to see -Z1 in the window and not have the - line up with the thing in the bottom so I can barely see it on the outside and see the top half of Z1 above that?

If anything I will get the belt on how I want it and then get in the window with a dremel to make my own Z1.

Kinda a good pic on this page but not quite clear enough for me and the google english translation needs some work: http://www.porsche924-944.nl/924/Tech_info.html

[GoodCat]

I'd get Z1 visible, put belt on as tight as it will go (mine was loose at this point) then rotated the crank to the clockwise) and then do tensioner. Once it's tensioned, it pulls it back into position
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1980 Porsche 931

[GoodCat]

Ugh, this would be first experience with Porsche. Cylinders 3 and 4 are completely dead with practically no compression.... Anyone got an engine for sale near Indianapolis, IN?
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1980 Porsche 931

[flosho]

Probably bent valves on 3 and 4, if your timing was off.

Look for a used 931 cylinder head and a gasket set from victor heinz.
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[This Space For Rent]

[alexvex]

[Rasta Monsta]

Those pesky roommates. Ya think they tried to start it with the belt off while you were out??
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Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[GoodCat]

I had the key, nope! Anyways, if the belts was off one notch and I started it, that's on me because I was the one to tighten the tensioner in the end, ugh. Suck the series of events! Don't sweat it Alex, it's not your fault. Water pumps come and go and the rest of it just went down hill lol. I really appreciate all the help you've been on the phone. Atleast I'm going to get myself in another daily driver soon and use this car for what is should be. Fun
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1980 Porsche 931

[Crux Mason]

Sorry about your luck Goodcat, sounds like you have some work ahead of you but at least nothing blew up. You have been a great help to me with my problem but it will be a while before we know if I got it right. I am gonna go through the rest of the car next and see if I can get all the old gas out.

[GoodCat]

ya, takes some time. It's unfortunate I was unsure of myself on the timing belt, otherwise I would have left it the first time I had it correct! Oh well, win some and lose some I guess. I'm giving up a fire of my fire arms arsonal to grab another vehicle for now, so I can take my time with this with this one. They said the leak down and compression was so bad, he assumes there's more damage inside of the engine than one would care to deal with. Maybe it's time to finally learn to do a complete engine rebuild! Swapped a ton, but never had a full understanding of the inner workings, could be a very good learning experience for me!
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1980 Porsche 931