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Remind us again why you are pulling #3.
You have a smoke issue. How did you get to conclude #3 is the problem, and how did you conclude it was the cylinder/piston? Have you checked the valve/valve guides(s). #3 and others. Regards Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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11-11-2012, 06:59 PM
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Join Date: Sep 2009
Location: Norway
Posts: 508
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It smoked blue on acceleration and when i removed the headers the #3 exhaust outlet (probably the wrong name) was wet with oil. Others where dry.
Here`s a picture of #3 Imageshack - 06092011031.jpg Ofcourse i should`ve done a leakdown and/or compression test first... but i didn`t. Kinda regret it now when the rings seem ok. Maby the rings are just worn out on that sylinder... |
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11-12-2012, 04:18 PM
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You can measure the ring gap by inserting the rings (removed from piston) in the TOP of the cylinder - the very fraction that does not suffer piston wear. This is the true original bore size. Any wear on the rings will show as an increase in gap between the ends. Measure with a feeler gauge the gap.
Check the oil ring is OK - not broken. If you intend re- using the rings - ie they check out OK - take note which ring comes from where. And there is a top and bottom edge to each ring - ie do not flip them upside down if putting back in. regards Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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11-12-2012, 04:33 PM
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Join Date: Nov 2003
Location: Naperville, Il
Posts: 496
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You never mentioned the mileage on the motor in any of your posts. The single photo you posted of the #3 exhaust port is not very telling. However, having said all that, these 911 motors are usually good for about 200k miles for bearings and rings. But, the valve guides are usually only good for a life of about half that. When your valve guides wear, olil will leak down the valves stems into the exhaust port and create the blue smoke of which you spoke.
So, my suggestion is that you consider inspection of valve guides and not rings as the potential source of your smoking. If the motor does, in fact, have around 100k miles since new (or the last rebuild), then consider doing a complete valve job on the engine including inspection and/or replacement of worn valve guides. It is relatively easy to pull the heads now that you have the motor out of the car and partially disassembled.
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Ernie 98 993 C2S - Arena Red/Beige 76 914/6 3.2 Conversion - Estorill Blue/Coral Red |
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11-13-2012, 09:15 AM
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Have you removed the valves on #3. Apart from wear they can also crack or break.
Check the rings as per mentioned above - including the oil ring - there is a special orientation for each part of that ring. And check the guides for wear or damage. Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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11-13-2012, 11:52 AM
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Join Date: Sep 2009
Location: Norway
Posts: 508
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Will try check the guides and do some more research on the rings. i have new rings for that sylinder though so i think i`ll replace them. i should maby change on all but i`ll see.
The engine has run 194k km so it has stretched it`s legs quite a bit. not sure on history on the engine so i have no idea what if anything has been done to it. Thank so far and i`ll give an update in the weekend as i`m working now. Much apprech!!! 
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11-13-2012, 04:21 PM
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