 Cracked crank, Yet more problems |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
| jeffdon |
 Jun 29 2014, 02:23 PM
Post
#1
|
|
Senior Member  Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 Region Association: None  |
Put my engine back together in November, and have been driving since then. Couple of 200 miles drives, mostly around town. Itts a 2056, webers, cam, nothing super high power. This weekend it started an awful clunk deep inside, and I got it off the road and towed home.
Got her puller apart, and here is what I have found. Crank broke threw the rearmost counterweight. How does this happen? So I need a new crank. What else should I replace? Obviously all main bearings. Rod bearings too? Attached thumbnail(s)  Attached image(s) 
|
   |
 
|
  |
Replies
| Matt Romanowski |
Jun 30 2014, 09:46 AM
Post
#2
|
|
Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
I'd inspect the case before trashing it. I've seen a decent number of cranks break in different motors and not hurt anything (other than the crank).
Expensive and not fun way to make paper weights. It sucks when you have to add a second broken parts shelf to the garage..... |
|
|
|
| jeffdon |
Jun 30 2014, 11:22 AM
Post
#3
|
|
Senior Member Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 Region Association: None |
QUOTE(Matt Romanowski @ Jun 30 2014, 08:46 AM)  I'd inspect the case before trashing it. I've seen a decent number of cranks break in different motors and not hurt anything (other than the crank). Expensive and not fun way to make paper weights. It sucks when you have to add a second broken parts shelf to the garage..... Looks like it hit the case. Marks that look like rough machine marks, but not even like machining. Deeper at the top. Is my case toast? Attached image(s) 
|
|
|
|
| Valy |
Jun 30 2014, 04:39 PM
Post
#4
|
|
Senior Member Group: Members Posts: 1,677 Joined: 6-April 10 From: Sunnyvale, CA Member No.: 11,573 Region Association: Northern California |
QUOTE(jeffdon @ Jun 30 2014, 10:22 AM) QUOTE(Matt Romanowski @ Jun 30 2014, 08:46 AM) I'd inspect the case before trashing it. I've seen a decent number of cranks break in different motors and not hurt anything (other than the crank). Expensive and not fun way to make paper weights. It sucks when you have to add a second broken parts shelf to the garage..... Looks like it hit the case. Marks that look like rough machine marks, but not even like machining. Deeper at the top. Is my case toast? Those marks will not trash the case. They don't look so deep that may cause structural problems. However, you need to check the case bore. It looks to me that the bearing has some play along the crank axle, seen on the bearing seat in the picture. It might be just the camera but you better check. |
|
|
|
| jeffdon |
Jun 30 2014, 09:55 PM
Post
#5
|
|
Senior Member Group: Members Posts: 1,094 Joined: 24-October 06 From: oakland, ca Member No.: 7,087 Region Association: None |
QUOTE(Valy @ Jun 30 2014, 03:39 PM) QUOTE(jeffdon @ Jun 30 2014, 10:22 AM) QUOTE(Matt Romanowski @ Jun 30 2014, 08:46 AM) I'd inspect the case before trashing it. I've seen a decent number of cranks break in different motors and not hurt anything (other than the crank). Expensive and not fun way to make paper weights. It sucks when you have to add a second broken parts shelf to the garage..... Looks like it hit the case. Marks that look like rough machine marks, but not even like machining. Deeper at the top. Is my case toast? Those marks will not trash the case. They don't look so deep that may cause structural problems. However, you need to check the case bore. It looks to me that the bearing has some play along the crank axle, seen on the bearing seat in the picture. It might be just the camera but you better check. They seem light-ish. I have another case. Guess I could send them both out and have a shop tell me which would be the best. |
|
|
|
Posts in this topic
jeffdon Cracked crank Jun 29 2014, 02:23 PM
jeffdon Ok, 914 guy I know had me look the thrust surface ... Jun 29 2014, 02:40 PM Jake Raby Was the crank magnafluxed at assembly? That fractu... Jun 29 2014, 07:35 PM
jeffdon
Was the crank magnafluxed at assembly? That fract... Jun 29 2014, 10:02 PM
jeffdon
Was the crank magnafluxed at assembly? That fract... Jun 30 2014, 11:38 AM Mark Henry Most likely your case is trashed, get a new core.
... Jun 30 2014, 07:05 AM stugray
Due to the the poor lighting in the pics, it is ... Jun 30 2014, 11:41 AM jeffdon
Due to the the poor lighting in the pics, it is... Jun 30 2014, 01:12 PM colingreene I have a spare factory 2.0 crank if you need it le... Jun 30 2014, 02:20 PM jeffdon
I have a spare factory 2.0 crank if you need it l... Jun 30 2014, 03:23 PM stugray Youd be better off getting one of the complete cra... Jun 30 2014, 04:07 PM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 1st June 2024 - 09:05 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.