Valve collision problem |
|
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. |
|
Valve collision problem |
thomasotten |
Jul 1 2018, 05:11 PM
Post
#21
|
Senior Member Group: Members Posts: 1,544 Joined: 16-November 03 From: San Antonio, Texas Member No.: 1,349 |
Brass shaving found mid stem
Attached thumbnail(s) |
thomasotten |
Jul 1 2018, 05:18 PM
Post
#22
|
Senior Member Group: Members Posts: 1,544 Joined: 16-November 03 From: San Antonio, Texas Member No.: 1,349 |
It is hard to make a good photo of this, but looking
down the guide, there are areas that look non uniform. Like the way wood looks when you have lightly run a chisel over it. Again, cause or effect? I’m leaning towards imperfect guide reeming. Attached thumbnail(s) |
Elliot Cannon |
Jul 1 2018, 05:21 PM
Post
#23
|
914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None |
Next time, send them here. (IMG:style_emoticons/default/biggrin.gif) http://www.europeanmotorworks.com/
|
bulitt |
Jul 1 2018, 06:14 PM
Post
#24
|
Achtzylinder Group: Members Posts: 4,188 Joined: 2-October 11 Member No.: 13,632 Region Association: South East States |
They used the wrong size reamer ?
Roll that valve stem on a piece of glass and see if it is bent. How much did they cut/deck the heads? Are you using stock length pushrods? |
Mark Henry |
Jul 1 2018, 07:41 PM
Post
#25
|
that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Hard to see, but definitely tight and a poor job.
When you drive guides in they collapse slightly, so they have to be reamed and honed back to spec. This is just common procedure, part of the job. |
reharvey |
Jul 2 2018, 06:13 AM
Post
#26
|
Senior Member Group: Members Posts: 573 Joined: 16-July 08 From: N. E. Ohio Member No.: 9,308 Region Association: North East States |
I had this exact same problem once and it was the new valve guides that were not reamed to the correct size. That's why you see the small pieces of brass and gulling marks on the valve stem. Pull the heads and remove all the valves then have someone ream all the new guides to the right size. Ray
|
thomasotten |
Jul 17 2018, 10:42 AM
Post
#27
|
Senior Member Group: Members Posts: 1,544 Joined: 16-November 03 From: San Antonio, Texas Member No.: 1,349 |
I won't be posting more about this until I have my head back. But sufficed to say, I'm very frustrated with RIMCO. I have been asking them for a week to work with me to get this resolved, as all the evidence points to a quality control issue starting with an improper inspection and work done on the valve guides. I have been asking the owner to call me since the middle of last week.
|
Lo-Fi Version | Time is now: 28th March 2024 - 07:12 PM |
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 ... |