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Poll: Scored cylinder failure for your 997, Y or N? tell us (yr, 997.1 or 997.2)

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View Poll Results: Poll: Have you had bore scoring on your 997.1 or 997.2 engine?
Yes, 997.1 (05-08 MY)
54
12.65%
Yes, 997.2 (09-12 MY)
2
0.47%
No, 997.1 (05-08 MY)
238
55.74%
No, 997.2 (09-12 MY)
133
31.15%
Voters: 427. You may not vote on this poll

Poll: Scored cylinder failure for your 997, Y or N? tell us (yr, 997.1 or 997.2)

Old 11-11-2018, 11:53 AM
  #196  
rtl5009
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Charles- You stated that later motors had the correct piston offsets, is that later M97 motors or it didnt switch till the 997.2
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Old 11-13-2018, 01:18 PM
  #197  
Charles Navarro
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Originally Posted by rtl5009 View Post
Charles- You stated that later motors had the correct piston offsets, is that later M97 motors or it didnt switch till the 997.2
Not until the 987.2 and 997.2 engines unfortunately.
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Old 11-16-2018, 02:48 PM
  #198  
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Mind if I ask what the engine replacement cost? I am thinking I will most likely replace the engine on my 997. Just trying to pull some numbers together. Thanks in advance.
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Old 12-02-2018, 06:38 PM
  #199  
Dennis R. Cliff
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I just bore scoped my 997.2 S with 54K miles on the car that has a little known history of maintenance. My concern was triggered by large carbon deposited in the exhaust ports. So far I have only looked at two cylinders as the other four were too near TDC for my scope to see much. The rear wheels are off of the floor so I am thinking of hitting the starter briefly with the plugs out to get BDC on different cylinders (any problem doing this?). The plugs on this car looked as if they were the original plugs with layers of deposits, the center electrode was black with carbon, the ground electrodes were well rounded off. I have included a few photos of the two cylinders that I was able to scope. These were the rearmost bores on each bank. It seems obvious to me that the scoring, the straight scratches or grooves in the cylinder walls and on piston skirts could only be caused by grit or hard particles such as carbon chunks or bits of metal scuffed off from the engines metal parts. Wear from piston skirt against cylinder wall should be smooth and uniform, not scratches or grooves. Would not dirty oil be the cause of bore scoring?
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Old 12-02-2018, 07:06 PM
  #200  
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The pictures didnít attach
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Old 12-02-2018, 07:25 PM
  #201  
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Rather than hit the starter, get a 24mm socket, put it on the main pulley and turn clockwise.
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Old 12-03-2018, 02:48 AM
  #202  
Dennis R. Cliff
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Default Cylinder bore scoring (997.2).

Sorry that the attachments did not attach. I will try again. I went out to do more bore scoping and did not get a chance to read the forum's best way comment to rotate the crank. A quick burst of the starter allowed viewing the bores of the other four cylinders. You can identify the latter photos by the fuel sheen on the piston tops. I am hoping that all the oil sheen was not washed off of the cylinder walls. Anyway I am not seeing any clear cut evidence of scoring. In only one photo does a short vertical (parallel to cylinder) line appear. You can see a lot of reflections off of the cylinder walls and they seem to have a uniform grey surface. The piston tops seem heavily encrusted with carbon. One photo near the end shows what appears to be blobs of oil on the wall of the cylinder and the edge of the piston looks strange. So anyway it would be great to get all your comments and impressions. I was totally impressed with the quality little borescope that I got on Amazon for $109.00. It is a Teslong digital borescope with a 3 or4 foot fiber optic cable. It is basically a digital camera with the fiber optics. Now I will have to borescope everything. It seems that my Porsche does not have scored cylinders.










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Old 01-09-2019, 04:12 AM
  #203  
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Taken my engine (2005, 3.8S, 135,000 kms) apart a few weeks ago.
Had beginning scoring in cil 4, 5 and 6, see picture.
The pistons are all reusable, was in time!
Will replace Lokasil by cast iron bushes (external compagny) and place new piston rings.
The cooling has allready been improved!

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Old 01-09-2019, 11:06 AM
  #204  
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Originally Posted by Lblade View Post
Taken my engine (2005, 3.8S, 135,000 kms) apart a few weeks ago.
Had beginning scoring in cil 4, 5 and 6, see picture.
The pistons are all reusable, was in time!
Will replace Lokasil by cast iron bushes (external compagny) and place new piston rings.
The cooling has allready been improved!

Nice to hear you caught early. Did you have any symptoms prior to seeing the minor scoring?
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Old 01-09-2019, 03:16 PM
  #205  
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There was some oil abuse, approx 0,5L per 1000 miles. But the valve guides are also worn out, have 0.5 mm play io the max of 0.25 mm.
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Old 01-09-2019, 03:24 PM
  #206  
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Originally Posted by Lblade View Post
There was some oil abuse, approx 0,5L per 1000 miles. But the valve guides are also worn out, have 0.5 mm play io the max of 0.25 mm.
How did the coating look on the sides of the piston skirts?
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