16v rear cam tower seal - 4 holes 3 bolts? - Rennlist - Porsche Discussion Forums

Go Back  Rennlist - Porsche Discussion Forums > Water Cooled Technical Discussion Areas > 928 Forum
Reload this Page >

16v rear cam tower seal - 4 holes 3 bolts?

Notices
928 Forum
Sponsored by:
Sponsored by: 928 Specialists

16v rear cam tower seal - 4 holes 3 bolts?

 
Old 03-15-2019, 01:41 AM
  #1  
rjtw
User
Thread Starter
 
Join Date: Oct 2002
Posts: 441
Default 16v rear cam tower seal - 4 holes 3 bolts?

I took off both rear cam tower cover plates on my 83 today and reinstalled with Rogerís cool silicone gaskets.

Question: There are 4 holes in the cover plate and 4 holes in the gasket and cam tower. 3 are threaded and take bolts. The 4th is not threaded and appears to extend right inside the cam tower and remains totally empty. These holes open up to air!! Am I missing something why doesnít this leak oil like crazy? Is there supposed to be a plug or anything?



rjtw is online now  
Old 03-15-2019, 05:38 AM
  #2  
gazfish
Addict
Rennlist Member
 
Join Date: Feb 2016
Location: Dublin, Ireland
Posts: 310
Default

That's normal, the distributed pressure from the 3 bolts is enough to keep it sealed.
gazfish is offline  
Old 03-15-2019, 11:12 AM
  #3  
Wisconsin Joe
Super User
 
Wisconsin Joe's Avatar
 
Join Date: Jan 2013
Location: Kaukauna Wisconsin
Posts: 4,267
Default

Nope, won't leak.

There's 4 holes on both the gasket and plate because both sides use the same parts, but the holes in the cam tower are mirror images.

Make sure you follow the torque spec. It's pretty low.
Wisconsin Joe is online now  
Old 03-15-2019, 12:55 PM
  #4  
rjtw
User
Thread Starter
 
Join Date: Oct 2002
Posts: 441
Default

Yes very low! I used blue loctite as well. So any idea where that fourth/unthreaded hole leads? When used on the front of the engine that is an oil passage. I inserted a dowel at least two inches into the cam tower from the fourth hole and it just seemed to connect to the inside of the cam tower. But maybe itís an unused oil passage that doesnít communicate with anything. I will assume so!
rjtw is online now  
Old 03-15-2019, 10:56 PM
  #5  
GregBBRD

Rennlist
Basic Site Sponsor

 
GregBBRD's Avatar
 
Join Date: Feb 2005
Location: Anaheim
Posts: 9,441
Default

Originally Posted by rjtw View Post
Yes very low! I used blue loctite as well. So any idea where that fourth/unthreaded hole leads? When used on the front of the engine that is an oil passage. I inserted a dowel at least two inches into the cam tower from the fourth hole and it just seemed to connect to the inside of the cam tower. But maybe itís an unused oil passage that doesnít communicate with anything. I will assume so!
Since the cam carriers are not rights and lefts, but only one part number and interchangeable from side to side, it is the same oil passage that is on the front.
__________________
greg brown




714 879 9072
[email protected]

There's a huge difference between great products and good marketing.

I'm all about the great products.
GregBBRD is offline  
Old 03-15-2019, 11:15 PM
  #6  
Speedtoys
Addict
Rennlist Member
 
Speedtoys's Avatar
 
Join Date: Sep 2010
Location: Boulder Creek, CA
Posts: 9,673
Default

Originally Posted by Wisconsin Joe View Post
Nope, won't leak.

There's 4 holes on both the gasket and plate because both sides use the same parts, but the holes in the cam tower are mirror images.

Make sure you follow the torque spec. It's pretty low.

More so with silicone, not sure that's a better solution when the OEM gasket is $1.
Speedtoys is offline  
 


Thread Tools
Search this Thread

Contact Us About Us Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: