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Steve
 
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Join Date: May 2014
Location: Commerce, MI
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How did I break my Cam Shafts

-disassembled 2.7 yesterday

-broke the end of the cam shaft off

-yes used the crow foot and socket from Pelican

-done 3-4 engines before with same tools, never had issues

-used (2) 2 foot long 1/2" drive ratchets

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1975 914 1.8l
1979 911SC Targa - In Restoration
1972 Pantera
Dune Buggy Dual Port 1835cc
1980 911SC Targa - Driver/Winter Project
Old 08-28-2017, 07:17 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
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I doubt you damaged them.

Its more likely that they were stressed upon installation during the tightening process or perhaps they were dropped.

They are more fragile than people think.
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Steve Weiner
Rennsport Systems
Portland Oregon
(503) 244-0990
porsche@rennsportsystems.com
www.rennsportsystems.com
Old 08-28-2017, 10:55 AM
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Under the radar
 
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Better now than on the track.

Show us a picture.
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Gordon
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'71 911 Coupe 3,0L outlawed
#56 PCA Redwood Region, GGR, NASA, Speed SF
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Old 08-28-2017, 12:11 PM
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Steve
 
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-will get a picture tomorrow

-I'm glad it happened also now, better than in my running rebuilt engine
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1975 914 1.8l
1979 911SC Targa - In Restoration
1972 Pantera
Dune Buggy Dual Port 1835cc
1980 911SC Targa - Driver/Winter Project
Old 08-28-2017, 01:45 PM
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Any knowledge of it having been reground in the past?
Old 08-28-2017, 06:32 PM
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Steve
 
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1975 914 1.8l
1979 911SC Targa - In Restoration
1972 Pantera
Dune Buggy Dual Port 1835cc
1980 911SC Targa - Driver/Winter Project
Old 08-29-2017, 02:47 AM
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Steve
 
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Quote:
Originally Posted by Edoyle View Post
Any knowledge of it having been reground in the past?
- no idea, I bought it from a guy who bought it from a guy deal

- I will measure some of the lobes when I pull the cams from the cam housings
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1975 914 1.8l
1979 911SC Targa - In Restoration
1972 Pantera
Dune Buggy Dual Port 1835cc
1980 911SC Targa - Driver/Winter Project
Old 08-29-2017, 02:48 AM
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broken cam

Over tightened from a previous installation.These cams are cast and not that strong.Fred
Old 08-29-2017, 03:01 AM
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Quote:
Originally Posted by faapgar View Post
Over tightened from a previous installation.These cams are cast and not that strong.Fred
Totally agree,...someone overtorqued them.
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Steve Weiner
Rennsport Systems
Portland Oregon
(503) 244-0990
porsche@rennsportsystems.com
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Old 08-29-2017, 08:05 AM
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Is that why Porsche changed to the newer style bolt in the '80s?
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Gordon
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'71 911 Coupe 3,0L outlawed
#56 PCA Redwood Region, GGR, NASA, Speed SF
Trackrash's Garage :: My Garage
Old 08-29-2017, 08:43 AM
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If anything, this is a good reminder to torque the cam sprocket correctly instead of zapping it with an airgun as I have heard some people do (to remove and install).
Old 08-29-2017, 06:45 PM
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Steve
 
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thanks to everyone for response, figured it was not something I did but something the PO did
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1975 914 1.8l
1979 911SC Targa - In Restoration
1972 Pantera
Dune Buggy Dual Port 1835cc
1980 911SC Targa - Driver/Winter Project
Old 08-30-2017, 05:33 AM
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Happened to me one time also..
Old 08-30-2017, 02:09 PM
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Steve
 
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Quote:
Originally Posted by GotaT View Post
Happened to me one time also..
glad to hear, I don't like starting a new club or being in one all by myself

[img]
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1975 914 1.8l
1979 911SC Targa - In Restoration
1972 Pantera
Dune Buggy Dual Port 1835cc
1980 911SC Targa - Driver/Winter Project
Old 08-30-2017, 05:49 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #14 (permalink)
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Drill and thread, time to go with the bolt


Sent from my iPhone using Tapatalk
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Craig
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Twinplug, head work, case savers, rockers arms, etc.
Old 09-01-2017, 04:17 PM
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Wow dude.

Have you considered an arm wrestling competition?
Old 09-01-2017, 04:24 PM
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Steve
 
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[QUOTE=cgarr;9723614]Drill and thread, time to go with the bolt


thanks Craig you can tell me all about it, coming to see you in the next few weeks and bringing you the heads from this build
__________________
1975 914 1.8l
1979 911SC Targa - In Restoration
1972 Pantera
Dune Buggy Dual Port 1835cc
1980 911SC Targa - Driver/Winter Project
Old 09-01-2017, 04:34 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #17 (permalink)
Steve
 
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Quote:
Originally Posted by Catorce View Post
Wow dude.

Have you considered an arm wrestling competition?
really didn't crank that hard on them, put a lot more torque on other ones that didn't bust but came loose just fine
__________________
1975 914 1.8l
1979 911SC Targa - In Restoration
1972 Pantera
Dune Buggy Dual Port 1835cc
1980 911SC Targa - Driver/Winter Project
Old 09-01-2017, 04:36 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #18 (permalink)
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Quote:
Originally Posted by smarens View Post
really didn't crank that hard on them, put a lot more torque on other ones that didn't bust but came loose just fine
Just giving you a ribbing!

Old 09-01-2017, 04:43 PM
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