main bearings, and an obliterated piston. - Saab 9-5 Bulletin Board - Saabnet.com
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main bearings, and an obliterated piston.
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Posted by bobc [Email] (#473) [Profile/Gallery] (more from bobc) on Sun, 9 Aug 2020 22:27:48 Share Post by Email
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Following up on my rescue, a '00 Aero.

https://www.saabnet.com/tsn/bb/9-5/index.html?bID=282300

this weekend we harvested pistons from the donor and practiced doing the main bearings with great success.

Main Bearings:
---------------
We had a week to think about techniques to remove the main bearings. We came up with a plan and decided to test it out on the donor car.

After removing the bearing cap, we had a bearing shell in hand. We filed off the tab on that shell. We then used this half to drive out the upper half. it worked quite well. The trick is to use a suitable "pusher" that would not scratch the journal.

We made a pusher out of a piece of PVC. Since the main bearings have 3 holes in them, we were able to hook the PVC tool on a hole and tap with a hammer. This rolls the modified shell up, and around the journal while pushing upper shell around and out. once it was out the new bearing can be rolled in the same way, pushing the modified shell out the other side. It worked quite well. We plan to use this technique on the rescue in a week or so to install new main bearings.

Pistons:
---------
We harvested all 4 pistons from the donor car, just in case we need them. The head was already off so popping them out was easy.



The pistons from this 220k mi donor all seemed good, and the cylinder walls seemed in great shape. The rod bearings from this car were decent. there was some scoring but not much and nothing like the rescue.

Obliterated #1 piston:
----------------------

In other news, I may have mentioned that my 2001 Aero blew a piston. I have not had time to look closely at this car but this weekend I pulled the sparkplugs and had a look down the cylinder.

I started with #4 and removed each plug. The plugs from #4,#3 and #2 looked great. Here is what #1 looked like:



Im no expert but pretty sure that is a bad sign. So I probed a bit with my long extension through the sparkplug hole...

Starting with #4 ... clunk hit the piston. #3 clunk, a piston. #2 clunk, a piston. #1 ... hmm ... I reached as far as I could, no obstruction. It's not clear where it is (perhaps on the road somewhere?) I dont know if I threw a rod through the block or if the piston detonated and there are bits of shrapnel in the crankcase. I dont have time to look just yet but Im really curious.

If you are keeping score, 3 cars with 3 unusual failures:
'00 Aero - 220k mi - rare transmission failure.
'01 Aero - 188k mi - #1 piston obliterated (#4 seems to be the common failure)
'00 Aero - 133k mi - #3 rod bearing shot (again #4 seems to be common failure)


_______________________________________ '08 9⁵ 2.3T SportCombi, Polar White '01 9⁵ Aero Midnight Blue (benched) '00 9⁵ Aero Midnight Blue (rescued) '99 9⁵ Base model, Cosmic blue '00 9⁵ Aero Silver (RIP - transmission )


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