Noisey saab, saga continues with new video - Saab 9-5 Bulletin Board - Saabnet.com
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'00 Aero, 133K mi, project car
Continuing from https://www.saabnet.com/tsn/bb/9-5/index.html?bID=282175
To the best of *my* abilities I've pinpointed the noise from the top end in the vicinity of #4. Using a stethoscope the noise was loudest on the exhaust manifold. The noise was prominent on the valve cover and on the intake manifold as well. Every other place on the engine block and pan that I probed I heard only distant, faint tapping or whirring sounds.
Note that I also heard some really loud rough noise on the alternator frame.
Given this we went ahead with a head swap. We removed the head from the donor car and refreshed with valve job, resurfacing, new seals and rebuilt and primed the lifters.
Today we removed the head from the recipient car. We replaced the alternator and the water pump for good measure. Side note: Alternator was a breeze with the head off! And I thought that the water pump would be too ... it's not!
Here are my findings with the head out of the car:
- There was no sign of sludge in the timing area or anywhere. There were no obvious problems (no broken springs, no bent valves.
- the lifters were all hard. there was no travel when they were unloaded. They were all rock hard.
- The valves on #4 looked markedly different from 1,2 and 3. The whole combustion chamber was carboned up, the valves themselves were dark (the others were white). I dont know what to make of this, but it does suggest something is up with #4
- I "rocked" all of the pistons side to side with my fingers. They all had some movement, all pistons had about the same amount of movement. Here is a video of #1 piston: https://photos.app.goo.gl/VkmHR7rxqEts3bJa7
- rocking them front to back (90 deg from that in the video) showed no noticeable movement and no clicking
- is that play in the pistons normal?
- Is it a fools errand to put that new refreshed head on this car?
'08 9⁵ 2.3T SportCombi, Polar White
'01 9⁵ Aero Midnight Blue (benched, busted piston)
'00 9⁵ Aero Silver (RIP - transmission )
'99 9⁵ Cosmic blue
'11 9⁵ Aero NG
'00 9⁵ Aero Mightnight Blue
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