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General NG900 / Old 9-3 Posts and Information Please post general topics pertaining to the NG900 and old 9-3.

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Old 06-12-2017, 04:44 AM   #41
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I wonder if what you are seeing on the pistons is a result of head gasket failure. In the past engines I have taken apart some of the pistons looked like they were steam cleaned. A result of coolant in the combustion chamber.

The contact I've seen (but not necessarily from a saab engine) has never looked like that.

You could maybe test your theory out while waiting, place something thin an impressionable on the piston top and put the head back on and rotate it? Maybe put some thin oil on the top and make sure the head is dry and see the oil contact the valves? Lots of options here.

If that were my motor, I think I would be trying to validate that the rings had not collapsed. I may pull a few pistons out of the top and check the condition and ring gaps (make sure they are not lined up).
This is a good idea. Maybe take a little bit of tin foil, make a couple of loose folds in an "M" shape. Put it on the piston top and see how far down it compresses.
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Old 06-12-2017, 04:52 AM   #42
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I wonder if what you are seeing on the pistons is a result of head gasket failure. In the past engines I have taken apart some of the pistons looked like they were steam cleaned. A result of coolant in the combustion chamber.

The contact I've seen (but not necessarily from a saab engine) has never looked like that.

You could maybe test your theory out while waiting, place something thin an impressionable on the piston top and put the head back on and rotate it? Maybe put some thin oil on the top and make sure the head is dry and see the oil contact the valves? Lots of options here.

If that were my motor, I think I would be trying to validate that the rings had not collapsed. I may pull a few pistons out of the top and check the condition and ring gaps (make sure they are not lined up).
In person it is much easier to tell the difference between the steam cleaning that you mentioned and this contact on the pistons. I have a feeling the contact has probably been occurring the entire time this motor has been together. The bare area on the edge of each piston where it looks like the coating was worn off matches the pattern of bumps on the spots on the head.

It was definitely leaking for some time, two of the pistons were steam cleaned pretty well. Two are still covered in carbon.
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Old 06-12-2017, 05:26 PM   #43
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If that were my motor, I think I would be trying to validate that the rings had not collapsed. I may pull a few pistons out of the top and check the condition and ring gaps (make sure they are not lined up).
I agree, that sounds like a really good idea since you're in there. Another hour or two to pull the oil pan and pop the pistons out the top would let you inspect things. I think you just want to be careful to put the bearings back in the same spots.
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Old 06-15-2017, 08:17 AM   #44
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Old 06-15-2017, 08:54 AM   #45
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I've been wanting to get a set of ARP exhaust manifold bolts. The new bolts (from eeuro) that I put in the 9-5 are already bad. 25k miles and one has broken. not looking forward to that repair, and of course it is the one next to the waterpump.

I cant help wondering if some stainless fasteners from mcmaster would be cheaper though!
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Old 06-15-2017, 10:37 AM   #46
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I've been wanting to get a set of ARP exhaust manifold bolts. The new bolts (from eeuro) that I put in the 9-5 are already bad. 25k miles and one has broken. not looking forward to that repair, and of course it is the one next to the waterpump.

I cant help wondering if some stainless fasteners from mcmaster would be cheaper though!
I'm sure a stainless set could be sourced for cheaper, it's just convenient t9 get it all packaged together. And since I was able to find the ARP # I found a set of 10 for pretty much what a set of 7 would have cost from the big name suppliers. I'm thinking of getting the 4 pack as well so I can run them on the turbo and downpipe.
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Old 06-20-2017, 06:07 PM   #47
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Picked this up today, 2008 black on black 2.0! And for a $1,000! Guy tried flipping it last winter when he bought it at an auction and then noticed it had a hard time starting in the bitter cold. It needs intake valves but runs great in the warm weather. It'll be my DD until the weather cools down and I can do the head job.



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Old 06-21-2017, 05:25 AM   #48
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In person it is much easier to tell the difference between the steam cleaning that you mentioned and this contact on the pistons. I have a feeling the contact has probably been occurring the entire time this motor has been together. The bare area on the edge of each piston where it looks like the coating was worn off matches the pattern of bumps on the spots on the head.

It was definitely leaking for some time, two of the pistons were steam cleaned pretty well. Two are still covered in carbon.

Have another look at your tune... those spots (based on the pictures) look exactly like a lean mixture.
Reason they match those spots to the head is because that is the highest point of compression, so that's where a lean mixture burn hottest.
A lean mixture will melt a piston before you know it.

EDIT: Saw your posts initially on SC but didn't see this specific info over there
I will re-emphasize to look at your tune. premature headgasket failure and the condition of the edges of the piston are sure signs of a lean mixture.


This is exactly what happened to my motor when my water/meth injection pump locked up and wasn't spraying methanol into my engine and made the mixture extremely lean
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Old 06-21-2017, 09:18 AM   #49
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Have another look at your tune... those spots (based on the pictures) look exactly like a lean mixture.
Reason they match those spots to the head is because that is the highest point of compression, so that's where a lean mixture burn hottest.
A lean mixture will melt a piston before you know it.

EDIT: Saw your posts initially on SC but didn't see this specific info over there
I will re-emphasize to look at your tune. premature headgasket failure and the condition of the edges of the piston are sure signs of a lean mixture.


This is exactly what happened to my motor when my water/meth injection pump locked up and wasn't spraying methanol into my engine and made the mixture extremely lean
Thanks, I'll go back to stock until I decide to get it tuned again.
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