Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > 911 Engine Rebuilding Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered
 
thaxtela's Avatar
 
Join Date: Jun 2006
Location: Alberta Canada
Posts: 132
Distributor shaft vertical movement

I attempted to search the previous post and found some postings on distributor shaft movement however cannot find a tolerance figure or something that would tell me how much movement is considered normal or OK. As mentioned in a previous post, three contact points in my distributor cap have small gouges from rotor contact. The rotor contact point is also wore unevenly on the right side and burnt. Attempting to identify if this is the result of the distributor cap not being seated correctly or or if my distributor needs to be rebuilt. The distributor shaft has approx. 1/16 inch vertical movement and very slight horizontal movement (way to small to measure). I telephoned a rebuilder today and he informed me that the shaft should have zero vertical movement and that the distributor needed to be rebuilt. Apologies of the question is a silly one. Still attempting to learn from reading postings and forums.

__________________
1986 911 Factory Turbo Look Targa 3.2 litre
Old 07-07-2008, 07:18 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered
 
BURN-BROS's Avatar
 
Join Date: Jun 2003
Location: Camarillo, Ca.
Posts: 2,418
You are looking for .005 of play..or so. The fabric washers fail giving the dizzy the excessive endplay.
__________________
Aaron. F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
https://www.instagram.com/burnhamperformance/
Old 07-08-2008, 04:51 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered
 
safe's Avatar
 
Join Date: Feb 2004
Location: Sweden
Posts: 4,148
Garage
"zero vertical movement"
Jesus! Mine moves up and down probably 1/8 of an inch....
and I do have a strange knocking sound now and then, mostly at low idle.
__________________
Magnus
911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
911T Coupe -69, 3.6, G50, "RSR", track day.
924 -79 Rat Rod EFI/Turbo 375whp@1.85bar.
931 -79 under total restoration.
Old 07-08-2008, 05:25 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Try not, Do or Do not
 
Henry Schmidt's Avatar
 
Join Date: Apr 2004
Location: Fallbrook, Ca. 92028
Posts: 14,087
Garage
Aaron is correct but let us expand:
The distributor shaft should have minimal axial play .001-.0015" and the lateral play (although taken up by fiber washers to be close to zero) should be no more than 004."or so.

The main source for concern in the early points distributor is the play/tolerance between the rotor shaft and the main shaft in the distributor. There is a small piece of felt under the rotor that is meant to be lubricated during every service but this service has been relegated to an "occasional at best" service and this lack of lubrication causes wear that is very often overlooked.

During a rebuild of this early style distributor it is not uncommon for one or both of these pieces are worn beyond usable ranges.

New parts are unavailable so core distributors with usable parts are the only resource.
__________________
Henry Schmidt
SUPERTEC PERFORMANCE
Ph: 760-728-3062
Email: supertec1@earthlink.net

Last edited by Henry Schmidt; 07-08-2008 at 07:07 AM..
Old 07-08-2008, 06:47 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Try not, Do or Do not
 
Henry Schmidt's Avatar
 
Join Date: Apr 2004
Location: Fallbrook, Ca. 92028
Posts: 14,087
Garage
Quote:
Originally Posted by safe View Post
"zero vertical movement"
Jesus! Mine moves up and down probably 1/8 of an inch....
and I do have a strange knocking sound now and then, mostly at low idle.
Low rpm knocking noises in 911 engines are generally caused by intermediate shaft gear wear or piston slap. It is uncommon for a distributor to be a source of strange knocking noises.

That said: with enough excess play I guess you could have some noise.
__________________
Henry Schmidt
SUPERTEC PERFORMANCE
Ph: 760-728-3062
Email: supertec1@earthlink.net
Old 07-08-2008, 07:12 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered
 
safe's Avatar
 
Join Date: Feb 2004
Location: Sweden
Posts: 4,148
Garage
Quote:
Originally Posted by Henry Schmidt View Post
Low rpm knocking noises in 911 engines are generally caused by intermediate shaft gear wear or piston slap. It is uncommon for a distributor to be a source of strange knocking noises.

That said: with enough excess play I guess you could have some noise.
Doesn't sound that promising...
I have been ignoring this and several other issues (probably worn valve guides) for a while, but I have a low mileage 3.2 thats going in later this year.
I'm hoping it will stay together for a couple of thousand miles more... Then I will look into it.

__________________
Magnus
911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
911T Coupe -69, 3.6, G50, "RSR", track day.
924 -79 Rat Rod EFI/Turbo 375whp@1.85bar.
931 -79 under total restoration.
Old 07-08-2008, 07:22 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Reply


 


All times are GMT -8. The time now is 04:14 PM.


 
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 -    DMCA Registered Agent Contact Page
 

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