View Single Post
jkarolyi jkarolyi is offline
Carbon Emitter
 
jkarolyi's Avatar
 
Join Date: Feb 2004
Location: Socialist Republic of California
Posts: 2,128
911E valve adjustment gone bad...help!

Hi All,

As a new 1971 911E owner, I was reffered to Pelican from some people at Rennlist, and found it to be a great place for ordering parts and for tech articles.

I bought the book "101 projects" and all the parts needed for a valve job and oil change. All went smoothly (I've adjusted valves for years on my 1971 BMW) until I started her up. Feels like it's running on five cylinders.

Thinking it might be an electrical problem, I pulled plug wires one at a time and ran the engine. Each time it ran even rougher than with all of them connected, so I'm assuming I'm getting good spark. Wouldn't this point to a misadjusted valve?

I bought the special "question mark" feeler guage and even went through the cycle a second time to check the clearance. I followed the 101 Projects instructions and removed the spark plugs while checking clearance, but looking at the Pelican website today I noticed a tech article that said you should leave them in, lest carbon shake loose and prevent the valves from sealing. DOH!

Questions:

1. When checking valve clearance, do you err on the "can barely move it in" or "moves in easily but has some resistance". I did the latter, which always worked fine on my BMWs.

2. Should I check compression on all cylinders...would that reveal a misadjusted or carbon-blocked valve?

3. If a valve is blocked by carbon, how can I clean it out? Some kind of engine cleaner flush?

4. If you lift the car on one side only, can I remove one lower valve cover without losing all my nice, fresh oil?

5. Where would you start to diagnose the problem? I've considered towing to a mechanic, but they just LOVE fixing other people's "repairs" . Any good 911 mechanics in the Redlands or Riverside, CA area?

A frustrated new 911E owner,

Jay Karolyi
Old 02-02-2004, 04:20 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)