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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16660
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Jan 29, 2019 6:34 pm    Post subject: Reply with quote

The cams were stationary(so likely a snapped chain). The reason that piston didn't hit a valve is because the valves were seated, whilst all the others were open, thus getting wacked by the pistons.
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 8364
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Tue Jan 29, 2019 6:39 pm    Post subject: Reply with quote

alex yates wrote:
The cams were stationary(so likely a snapped chain). The reason that piston didn't hit a valve is because the valves were seated, whilst all the others were open, thus getting wacked by the pistons.


Sounds about right, I had 10 bent valves (IIRC) when my chain snapped.
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16660
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Jan 29, 2019 6:45 pm    Post subject: Reply with quote

.......and snapped chain possibly down to getting damaged when trying to fit the LN bearing in situ. nooo
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kas750
Shanghai


Joined: 31 Mar 2013
Posts: 4510
Location: Chorley lancashire

2006 Porsche 911

PostPosted: Tue Jan 29, 2019 6:54 pm    Post subject: Reply with quote

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Chris_in_the_UK
Estoril


Joined: 19 Mar 2014
Posts: 3585
Location: Harrogate


PostPosted: Tue Jan 29, 2019 8:37 pm    Post subject: Reply with quote

alex yates wrote:
.......and snapped chain possibly down to getting damaged when trying to fit the LN bearing in situ. nooo


Pretty much I reckon.
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7135
Location: Brighton


PostPosted: Tue Jan 29, 2019 8:58 pm    Post subject: Reply with quote

I had a strange one in about 6 monthes ago .. Cayman with a snapped chain .. i removed the head on the side of the snapped chain .. nothing obvious but trying to rotate the engine by hand and it locked up .

Something wrong with the opposite side then ..

I removed that head and it turned over fine .. it was carbon build up in the cyls .. compressed carbon is pretty much concrete .. it had built up to the point that it jammed against the pistons and snapped the chain .

never seen it before , i couldn,t figure out the reason for this as these cars dont tend to do this ..well .. its a new one on me anyways .. repaired the car .. not cheap btw and spent ages looking at values trying to figure this fault out .

Didnt get to the bottom of it but its one we are monitoring ..

In essence a snapped chain can be down to different reasons .
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infrasilver
Fast & Furious
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Joined: 04 Oct 2010
Posts: 8364
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Tue Jan 29, 2019 9:15 pm    Post subject: Reply with quote

Never really worked out why mine snapped, original IMS bearing as was still in good nick, the guides and tensioners were fine, it only had around 60k miles so not particularly high miles.

The only thing I came up with is a roller on the chain came off and jammed into the scavenger pump locking the cams and with the rest of the engine still turning it all went haywire. The collateral damage is so much when something like this happens its hard to pinpoint where it all started.
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