Pelican Parts Forums

Pelican Parts Forums (http://forums.pelicanparts.com/)
-   911 Engine Rebuilding Forum (http://forums.pelicanparts.com/911-engine-rebuilding-forum/)
-   -   New rocker-should I return it? (http://forums.pelicanparts.com/911-engine-rebuilding-forum/875235-new-rocker-should-i-return.html)

Neilk 07-17-2015 04:09 PM

New rocker-should I return it?
 
Hello,

One of my rockers backed out and looks a little worn, so I bought a new OEM one from our host. I was wondering if I should deburr the top part, but in taking the picture, I wonder if it is even worth installing. Thoughts?

http://forums.pelicanparts.com/uploa...1437178541.jpg

Flat6pac 07-17-2015 05:04 PM

Compare it to the new one, it looks anything but smooth and that's your valve lift.
Bruce

Neilk 07-17-2015 06:08 PM

That is the new one. The old one is a little marred on one side but looks much smoother.

So should I keep it?

al lkosmal 07-17-2015 09:14 PM

Return it...............crappy quality control.
regards,
al

safe 07-17-2015 10:42 PM

The top bit wouldn't worry me, but the surface looks horrrible for a new part. Return it.

Steve@Rennsport 07-18-2015 12:09 AM

Thats what a LOT Of new ones now look appear. Porsche's QC is not good anymore, which is why we look for use rocker arms and refurbish them.

Even new rockers MUST be reground so the pads are parallel with the cam lobes.

chris_seven 07-18-2015 01:08 AM

Quote:

Originally Posted by Neilk (Post 8715333)

This casting clearly shows signs of porosity on its surface. It is possible that grinding may remove these defects but could also reveal more holes in the surface.

Not really very good at all.

Our forged rockers are shot peened after machining and then Isotropically Superfinished (REM) before being Nitrided using a modern PVD process.

http://i197.photobucket.com/albums/a...psgok160ua.jpg

Steve@Rennsport 07-18-2015 10:23 AM

Very nice, Chris!

Neilk 07-19-2015 12:07 PM

Thanks for confirming. I will return it and either get my old rocker resurfaced or find one that has already been reconditioned to proper spec.


All times are GMT -8. The time now is 06:38 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website


DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.