So on top of everything else that has dumped on me lately, my daughter's Jetta flames out at the end of the road yesterday. No problem I tell her, probably just a coil or ignition switch, Mk3's are known for such things. So I get home last night and check into it.
Spark, yep.
Fuel, yep
Injectors firing, yep.
Igniton rotor turning, yep.
So now I check timing marks, huh, cam is retarded two teeth. Belts kinda loose, no big deal, slide the belt off the cam sprocket and line it up. Distributor is close enough, still no start. So I pull the lower cover and check the aux. shaft, yeah it's out. Line everything back up and still no start. So I do a compression check on 1 and 4 (only ones you can get to) Oh CRAP! Nothing. How come I get customer cars in my shop all the time with these motors with broken timing belts and can put a belt on them and be fine? But when my Jetta breaks one at a stop sign it bends valves. I'm more than a little perplexed at this point. Sweet running little car too. Off with it's head!
91 Cabriolet, red w/white
86 Cabriolet white/white (oldest daughter)
97 Golf, black (youngest daughter)
98 Beetle, red
94 Cabrio, dark green (oldest son) Cogito Ergo Zoom
Well, here's the deal. Most of your customers prollie got lucky and had the belt brake at lower rpm levels or were quick with pushing in the clutch.
Sucks that she bent the valves, hopefully when you get in there you won't see too much damage. I'd rather have to replace the pistons at that point then have to source another head. Then again, you prollie have the right connections to get another head, so maybe thats easier for ya.
Either way, good luck with that and if you wouldn't mind, could ya take some pics. I haven't seen any good pics of this issue on a VW just yet and would like to see the aftermath.
I can't imagine that there would be any head or piston damage. We
aren't talking 16v here. Yeah I'll take some pics and try to get them up. I'll be at the new job next week and I don't know how locked down the PC's are yet. It might be fun bypassing the system. I was spoiled here, pretty much do what I want.
91 Cabriolet, red w/white
86 Cabriolet white/white (oldest daughter)
97 Golf, black (youngest daughter)
98 Beetle, red
94 Cabrio, dark green (oldest son) Cogito Ergo Zoom
Oh boy, I read this and had a flash back to when my Diesel skipped a tooth, actually the new belt broke a tooth....well okay it had less than 5 k on it.
There was a hole next to the number 1 intake piston the exhaust piston was bent a bit, and the intake valve was forged to the head...
That is when I looked and remember that there weren't no clearence clarence between the valve and the pistons at 0 TDC.......
I hope you don't have them same issues.... I wouldn't think since they are supposed to be non interfearence for the clearence.
Briano
Yes as matter of fact, I have the Luck o'the Irish...everything I touch turns to fertilizer of the bovine variety. You can lead a user to a link, but you can't make him Click....
Diesel is a whole different animal. You can't be one tooth off without damage to a diesel. I just did a timing belt on a 91 diesel last week. Set up all the sprockets and rotated the motor by hand, real slow about a dozen times to make sure all is well. I'm sure I'll find just enough damage to the valves to keep them from seating. No more, no less.
91 Cabriolet, red w/white
86 Cabriolet white/white (oldest daughter)
97 Golf, black (youngest daughter)
98 Beetle, red
94 Cabrio, dark green (oldest son) Cogito Ergo Zoom
Actually, according to the timing belt issue that I have the 2.0ABA motors are interference motors. I have just never seen one hit valves before. Course it has to be mine that does it.
91 Cabriolet, red w/white
86 Cabriolet white/white (oldest daughter)
97 Golf, black (youngest daughter)
98 Beetle, red
94 Cabrio, dark green (oldest son) Cogito Ergo Zoom
When isn't that the case. it's always my car that eats a wheel bearing. However, it's never the same reason, or even the same side. But it all sucks the same
Yeah, that's news to me also. Out of all the 2.0's broken timing belt occurences that I have dealt with I have never seen damage internally.
If you do get some pics, please send them.
sixsracing wrote:Actually, according to the timing belt issue that I have the 2.0ABA motors are interference motors. I have just never seen one hit valves before. Course it has to be mine that does it.
Of course, that's O'Toole's Therum..."Murphy was an optimist!"
Update: Got it apart last night and I took a look . I do not see any valve damage at all, I'm going to pull them and lap them in anyway because there seems to be debris on the seats. The head is amazingly clean, but the tops of the pistons had quite a bit of flaky carbon on them. My theory is that when the belt jumped, the valves came down and loosened some carbon. When the exhaust valves opened up, some of the carbon stuck to the seats and would not allow the valves to close properly. If I had not done a compression check I would feel I pulled the head for no reason. There is just a small amount of carbon on each seat, but it's enough to keep the valves from sealing. The kicker is the head gasket was perfect, no signs of weakening at all, and I broke two pipe to manifold studs Oh well, couple hours work and a $100.00 should put her back on the road.
91 Cabriolet, red w/white
86 Cabriolet white/white (oldest daughter)
97 Golf, black (youngest daughter)
98 Beetle, red
94 Cabrio, dark green (oldest son) Cogito Ergo Zoom
Isn't that always the case.. I guess it's better than the worst case scenario!
I just finished my wife's 8V. Had a nasty ringing sound like a cracked flexplate. Got half way done with removing the block and my elbow hit the skidplate on the slushbox. There's the noise... So since I was halfway there, I did the rings, oil pump and valves. Replace three broken studs while I was at it. The #1 exhaust had none holding it on! It's running nicely now, but cost me more $$$ and a few more split knuckles than I was counting on. So now the 924 has got to wait awhile longer...
Oh, and the Bentley warned against the 8V as being an interference motor.
Her car, my tools. It's all about sharing! ///Ocean State Dubs
'87 red/white Cabby
'92 Triple white Cabby(an 8V decked and overbored nightmare. 303 Cam baybee!)
this is an old thread but I guess I'll finish the story. The motor went back together fine, put the key to her and she cranked and cranked but no puff. Check spark, timing marks, fuel pressure and everything was perfect. Would not fire and run. The spark was a good white, hot flame but just didn't look right. So we put a coil in it and started right up.
Moral of the story is:
Don't trust a good white spark!
91 Cabriolet, red w/white
86 Cabriolet white/white (oldest daughter)
97 Golf, black (youngest daughter)
98 Beetle, red
94 Cabrio, dark green (oldest son) Cogito Ergo Zoom
posisble that the coil was producing good spark but not sending a proper signal back to the ingnition.
I know on my rocco that the coild can fire properly, but if it's not sending a good signal back, it won't allow the fuel pumps to turn on and therefore, no vroom-vroom.
. I do not see any valve damage at all, I'm going to pull them and lap them in anyway because there seems to be debris on the seats. The head is amazingly clean, but the tops of the pistons had quite a bit of flaky carbon on them. My theory is that when the belt jumped, the valves came down and loosened some carbon. When the exhaust valves opened up, some of the carbon stuck to the seats and would not allow the valves to close properly. If I had not done a compression check I would feel I pulled the head for no reason. There is just a small amount of carbon on each seat, but it's enough to keep the valves from sealing. The kicker is the head gasket was perfect, no signs of weakening at all, and I broke two pipe to manifold studs 
Oh well, couple hours work and a $100.00 should put her back on the road.
I guess it's better than the worst case scenario!
So since I was halfway there, I did the rings, oil pump and valves. Replace three broken studs while I was at it. The #1 exhaust had none holding it on! It's running nicely now, but cost me more $$$ and a few more split knuckles than I was counting on. So now the 924 has got to wait awhile longer...