Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> Anyone ever seen this happen?
aaron72914
post Jul 31 2014, 07:40 AM
Post #1


Newbie
*

Group: Members
Posts: 16
Joined: 20-September 12
From: Republic, KS
Member No.: 14,957
Region Association: None
I heard a not so good noise just driving in town. I was only 4 blocks from home so drove on home, put it in the garage and shut it off. Finally got the time to tear into it (a little over a year later) (IMG:style_emoticons/default/sad.gif) and this is what I found. I'm not really sure what would cause this. I rebuilt this engine back in 1998, so I guess I can't complain too much. Just curious if anyone has seen this happen before and what might have caused it.

Thanks.

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
76-914
post Jul 31 2014, 07:55 AM
Post #2


Repeat Offender & Resident Subaru Antagonist
**********

Group: Members
Posts: 13,484
Joined: 23-January 09
From: Temecula, CA
Member No.: 9,964
Region Association: Southern California
Any slack or wobble at that wrist pin? I've destroyed the top of one but never the side of one. Was there any piston slap before hand?
User is online!Profile CardPM
Go to the top of the page
+Quote Post
aaron72914
post Jul 31 2014, 08:15 AM
Post #3


Newbie
*

Group: Members
Posts: 16
Joined: 20-September 12
From: Republic, KS
Member No.: 14,957
Region Association: None
I haven't checked for slop on the wrist pin yet, but didn't notice any piston slap before hand. No real warning signs of any kind....running fine, then just broke.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
76-914
post Jul 31 2014, 08:21 AM
Post #4


Repeat Offender & Resident Subaru Antagonist
**********

Group: Members
Posts: 13,484
Joined: 23-January 09
From: Temecula, CA
Member No.: 9,964
Region Association: Southern California
Looks like it separated at the oil ring landing. Jake will have the definitive answer if he sees this.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Dr Evil
post Jul 31 2014, 11:04 AM
Post #5


Send me your transmission!
***************

Group: Members
Posts: 22,993
Joined: 21-November 03
From: Loveland, OH 45140
Member No.: 1,372
Region Association: MidAtlantic Region
I am wondering if piston defect. Weird break.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
malcolm2
post Jul 31 2014, 11:21 AM
Post #6


Advanced Member
****

Group: Members
Posts: 2,738
Joined: 31-May 11
From: Nashville
Member No.: 13,139
Region Association: South East States
I had a Type 1 bug cylinder break in the up and down orientation. It was one of the cylinders next to the flywheel. The other side was cracked but had not broken yet. I figured that end had extra vibration. (IMG:style_emoticons/default/confused24.gif)

As we dug into the engine on that car, we found out that a PO had used JC Whitney parts, or maybe the whole engine, I can't remember all the details back that far. So in 1982 we chalked that one up to lower quality parts. I haven't bought anything critical from JC Whit. since.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
scotty b
post Jul 31 2014, 11:27 AM
Post #7


rust free you say ?
***************

Group: Members
Posts: 16,375
Joined: 7-January 05
From: richmond, Va.
Member No.: 3,419
Region Association: None
(IMG:style_emoticons/default/blink.gif) it may just be the angle you took the pic, but did you leave the rd bushing out ? That wrist pin looks WAAYYYYY off center of the rod end.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
flash914
post Jul 31 2014, 11:33 AM
Post #8


Member
**

Group: Members
Posts: 124
Joined: 1-January 11
From: littlerock CA
Member No.: 12,554
Region Association: Southern California
I wonder about overheat and collapsed the skirt till it broke off. If you look at the crown of the piston at about 1 o'clock it looks like scuffing or metal movement. I think I would check my temps/ cooling system when it went back together. Gordon
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
colingreene
post Jul 31 2014, 12:09 PM
Post #9


Senior Member
***

Group: Members
Posts: 729
Joined: 17-October 13
From: Southern California
Member No.: 16,526
Region Association: Southern California
Check the piston to wall on the other cyls.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cap'n Krusty
post Jul 31 2014, 12:29 PM
Post #10


Cap'n Krusty
**********

Group: Members
Posts: 10,794
Joined: 24-June 04
From: Santa Maria, CA
Member No.: 2,246
Region Association: Central California
QUOTE(scotty b @ Jul 31 2014, 10:27 AM) *

(IMG:style_emoticons/default/blink.gif) it may just be the angle you took the pic, but did you leave the rd bushing out ? That wrist pin looks WAAYYYYY off center of the rod end.


Looks fine to me. The pin floats in the wristpin bushing, and it looks square in the rod.

The Cap'n
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
aaron72914
post Jul 31 2014, 12:43 PM
Post #11


Newbie
*

Group: Members
Posts: 16
Joined: 20-September 12
From: Republic, KS
Member No.: 14,957
Region Association: None
Thanks for all the suggestions and observation. I will definitely take them all into consideration when I continue this rebuild. I am also concerned the it got too hot, but have not found anything wrong with the cooling system...ie. blower, oil cooler, and cooling fins all look good. oil was full and clean. Could the oil pump have failed?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ClayPerrine
post Jul 31 2014, 02:18 PM
Post #12


Life's been good to me so far.....
***************

Group: Admin
Posts: 15,394
Joined: 11-September 03
From: Hurst, TX.
Member No.: 1,143
Region Association: NineFourteenerVille
If the oil pump had failed, you would have destroyed a rod or main bearing before the piston skirt failed like this.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
aaron72914
post Jul 31 2014, 02:53 PM
Post #13


Newbie
*

Group: Members
Posts: 16
Joined: 20-September 12
From: Republic, KS
Member No.: 14,957
Region Association: None
Thanks ClayPerrine, I did some resource after I posted that and realized exactly what you said. So, does the oil pump push oil through the oil cooler also, or how does that work?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SLITS
post Jul 31 2014, 03:12 PM
Post #14


"This Utah shit is HARSH!"
**********

Group: Benefactors
Posts: 13,602
Joined: 22-February 04
From: SoCal Mountains ...
Member No.: 1,696
Region Association: None
QUOTE(aaron72914 @ Jul 31 2014, 01:53 PM) *

Thanks ClayPerrine, I did some resource research after I posted that and realized exactly what you said. So, does the oil pump push oil through the oil cooler also, or how does that work?


Oil pump feeds all the galleries which feed the rotating/reciprocating parts (mains, rods, valves, cam, etc. It also pushes oil thru the cooler and filter.

Air flow through the cooler is something else. If your thermostat is working that control the flaps in the blower housing, the cooler is bypassed when the engine is cold.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
aaron72914
post Aug 1 2014, 06:14 AM
Post #15


Newbie
*

Group: Members
Posts: 16
Joined: 20-September 12
From: Republic, KS
Member No.: 14,957
Region Association: None
Thanks Slits. I'll check thermostat and flaps with a heat gun before re-installation.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 19th April 2024 - 09:19 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...