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I had a problem with my car (91 900NA, 180k miles) at work a couple of weeks ago and found zero compression in cylinder 3 (posts from 10/28 and 10/31). I had the car towed to my house last Friday and have been working at it little by little in the evening after the kids were in bed. Just last night finally took off the head and found a big chunk missing from one of my exhaust valves. I did not find the piece or any damage in the cylinder so I guess it blew out and is probably sitting in my catalytic converter. I have some cool pictures but I don’t know how to host them on the board.
I will bring the head to a local machine shop that is used by my Saab indy and have them take a look at it. In general, would one replace all valves at the same time or just the one that is damaged? Also, how does something like this happen? The deposits in the chamber are different than from the other three but I don’t know if it is because it ran for about 20 minutes total after it happened or if that is an indication that something was wrong with cylinder three before. The injectors all looked very clean but should I have a shop verify the flow rate for the one in number 3?
The good news was that the block looks in very nice shape with very little signs of corrosion. The head gasket was good too, I think (installed at around 10k miles when they replaced some valves under warranty for the PO). I have been using the Mercedes stuff and the 82C thermostat so maybe that helped too.
One last question, one of the sources I used was Townsend and they have the following instructions:
“If the tensioner you have is black, with a 12 mm bolt on top of a 27 mm body, you have the updated tensioner and there is no need to replace it with a new one, but use a new seal for it. To remove it, remove the 12 mm bolt, get the spring and plastic plunger out of the hole. Then remove the 27 mm tensioner body. When you get the main body out, measure the length the plunger is extended. If it is more than 11 mm, Saab says to replace the timing chain because it is stretched. See the section on replacing the timing chain for more info.”
How do you measure the length of the plunger (i.e. do you include the measure of the plunger head)? From the top of the plunger to the body, I’m at over 12mm. From the bottom of the plunger to the body, I’m under 10mm.
posted by 167.83.10...
, Thu, 17 Nov 2005 21:22:14
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