 Is it valves or rings ? |
|
|
|
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. |
|
|
| jsteele22 |
 Sep 29 2005, 04:12 PM
Post
#1
|
|
Senior Member  Group: Members Posts: 727 Joined: 24-August 05 From: Colorado Springs, CO Member No.: 4,653  |
My '76 2.0L is putting out a little smoke on hard acceleration. Is there a way to tell if the oil is leaking past valves vs. piston rings ? The old trick I always heard was to test compression, put a little oil in the spark plug hole, and retest. But that won't work on a horizontal cylinder. My hunch is that it's the valves, but only because its easier for someone (PO, not me !!!) to screw them up by not doing regular valve adjustments. My records are a little patchy, but I think the engine was rebuilt less than 50k mi. ago. Any consensus on what tends to go sooner ? Thx |
   |
 
|
  |
Replies
| lapuwali |
Sep 29 2005, 10:49 PM
Post
#2
|
|
Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743  |
Yes. The only way to tell if you have bad guides is to pull the heads off and find out. Compression and leakdown tests only check ring and valve sealing.
|
|
|
|
Posts in this topic
jsteele22 Is it valves or rings ? Sep 29 2005, 04:12 PM
lapuwali Not valves, but valve guides (which have nothing t... Sep 29 2005, 04:29 PM Jake Raby Never recommend a top end only rebuild...
The eng... Sep 29 2005, 04:33 PM billd The usual way do diagnose a compression problem is... Sep 29 2005, 06:56 PM Sammy If you have it on TDC it can't leak past the g... Sep 29 2005, 08:49 PM Brett W Bad valve guides will show up on start up. If you... Sep 29 2005, 11:43 PM jsteele22 Wow,
You folks have chops. I never knew why... Sep 30 2005, 10:07 AM BMartin914 Get it waived. Adjust your valves, buy a couple ca... Sep 30 2005, 12:57 PM
jsteele22 |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 9th July 2025 - 12:04 PM |
Invision Power Board
v9.1.4 © 2025 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 ... |