Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

Timing Belt FUBAR

Thread Tools
 
Search this Thread
 
Old Jan 29, 2014 | 03:18 PM
  #1  
928newb's Avatar
928newb
Thread Starter
Advanced
 
Joined: Oct 2013
Posts: 99
Likes: 1
From: Phoenix, AZ
Default Timing Belt FUBAR

All the belts and the water pump were replaced by the PO in 2004 by AZtech performance in Gilbert AZ. The car has been driven for less than 2k miles and then parked for 8+ years before I got my hands on it and began to fix it up.

Since I was given the receipts for everything the PO had done on it, I took it for granted that it was OK. Today, when I decided to take the air pump out of the equation and install the 21" belt, just for the sake of it, I cranked the engine to the 0 mark and checked the camshaft gear through the peep holes in the covers.

To my surprise, the timing marks were not to be seen. I have removed the passenger side cover and found that the timing mark is on the bottom, 180 degrees from where it should be....


[IMG][/IMG]

[IMG][/IMG]
Reply
Old Jan 29, 2014 | 03:25 PM
  #2  
Mrmerlin's Avatar
Mrmerlin
Team Owner
20 Year Member
 
Joined: May 2004
Posts: 31,279
Likes: 4,248
From: Philly PA
Default

OK so spin the crank a few more times and the cams will then line up at TDC

NOTE the engine now is set at 180 degrees out of TDC
Reply
Old Jan 29, 2014 | 03:25 PM
  #3  
Dutch 928 fan's Avatar
Dutch 928 fan
Racer
15 Year Member
 
Joined: Dec 2009
Posts: 305
Likes: 9
From: The Netherlands, Zuid Beijerland
Default

Check if it is really at TDC. Is the distributor arm pointing towards spark plug number one?
You may have to crank one more round since the TDC mark (OT=Oben Top) passes by every 180degr.
Reply
Old Jan 29, 2014 | 03:25 PM
  #4  
PorKen's Avatar
PorKen
Inventor
Rennlist Member

20 Year Member
 
Joined: Sep 2002
Posts: 10,218
Likes: 468
Default

Try rotating the crank one-more-time.


The cam bolts have been messed with, so I would check the timing with a PK32V'r.
Reply
Old Jan 29, 2014 | 03:26 PM
  #5  
BRB-83-911SC's Avatar
BRB-83-911SC
Rennlist Member
20 Year Member
 
Joined: Jul 2005
Posts: 1,096
Likes: 133
From: Woburn MA
Default

Crank it around 1 more time to "0" and the cam marks should line up. The crank turns 2x for each cam revolution.
Reply
Old Jan 29, 2014 | 03:27 PM
  #6  
BRB-83-911SC's Avatar
BRB-83-911SC
Rennlist Member
20 Year Member
 
Joined: Jul 2005
Posts: 1,096
Likes: 133
From: Woburn MA
Default

Looks like everyone's on it simultaneously
Reply
Old Jan 29, 2014 | 03:28 PM
  #7  
928newb's Avatar
928newb
Thread Starter
Advanced
 
Joined: Oct 2013
Posts: 99
Likes: 1
From: Phoenix, AZ
Default

LOL - I guess that was a brain fart...
Reply
Old Jan 29, 2014 | 03:29 PM
  #8  
Kevin in Atlanta's Avatar
Kevin in Atlanta
Rennlist Member
20 Year Member
 
Joined: May 2002
Posts: 9,283
Likes: 1,330
From: Roswell, GA
Default

Deleted.
Reply
Rennlist Stories

The Best Porsche Posts for Porsche Enthusiasts

story-0

10 Best Non-Flat Six Porsches You Can Buy For Under $100K

 Joe Kucinski
story-1

Porsche's Top 5 Most Questionable Naming Decisions

 Verdad Gallardo
story-2

Pogea Racing's 964 Porsche 911 Reimagination Stands Out in a Crowded Field

 Verdad Gallardo
story-3

6 Convertible Top MYTHS Most People Don't Understand!

 Michael S. Palmer
story-4

2026 Porsche 911 Club Coupe is Spectacular, And Everything Wrong with the Porsche Market

 Joe Kucinski
story-5

Talos Takes Your 991 Porsche 911 GT3 to the Next Level for a Cool $1.13 Million

 Verdad Gallardo
story-6

9 Vehicles Porsche Helped Engineer that Aren't Porsches

 Verdad Gallardo
story-7

9 Features and Characteristics That Only Porsche People Understand

 Verdad Gallardo
story-8

I've Written 500 Rennlist Articles: Here's How Porsche Has Changed Along the Way

 Joe Kucinski
story-9

10 Most Unnecessary Porsches Ever Built (And Why We Love Them)

 Verdad Gallardo
Old Jan 29, 2014 | 03:54 PM
  #9  
John Speake's Avatar
John Speake
Rennlist Member
20 Year Member
 
Joined: Feb 2002
Posts: 7,060
Likes: 42
From: Cambridge England
Default

If the belt is 8 years old it should be changed, regardless of mileage ?
Reply
Old Jan 29, 2014 | 05:00 PM
  #10  
Mrmerlin's Avatar
Mrmerlin
Team Owner
20 Year Member
 
Joined: May 2004
Posts: 31,279
Likes: 4,248
From: Philly PA
Default

to make things easier remove the 2 top bolts on the fan shroud and then pull it clear,
this will give you much room to work
Reply
Old Jan 29, 2014 | 07:32 PM
  #11  
Gary Knox's Avatar
Gary Knox
Rennlist Member
20 Year Member
 
Joined: Dec 2004
Posts: 3,529
Likes: 591
From: West Chester, PA
Default

To pull the fan shroud, you MAY need to take the upper radiator hose off the radiator so the shroud can be tilted back and pulled up. Of course, first drain some of the coolant to get the level down below that hose! Drain plug is on the bottom right corner of the radiator.

Gary-

Last edited by Gary Knox; Jan 30, 2014 at 04:35 PM.
Reply
Old Jan 29, 2014 | 09:07 PM
  #12  
Avar928's Avatar
Avar928
Rennlist Member
 
Joined: Nov 2011
Posts: 1,068
Likes: 1
Default

For every two revolutions of the crank, the cam gears turns once.
Reply
Old Jan 29, 2014 | 09:44 PM
  #13  
Imo000's Avatar
Imo000
Captain Obvious
Super User
 
Joined: Aug 2003
Posts: 22,846
Likes: 348
From: Cambridge, Ontario, Canada
Default

I bet you'll never make this mistake again.
Reply
Old Jan 29, 2014 | 09:46 PM
  #14  
Adamant1971's Avatar
Adamant1971
Rennlist Member
10 Year Member
 
Joined: Aug 2011
Posts: 7,296
Likes: 2,222
Default

Originally Posted by Imo000
I bet you'll never make this mistake again.
I did the same recently so your not alone. I had my belt off and had a little freak out moment until it was confirmed that since my crank was at 45 it was all good.

And ya that's a mistake you only make once.
Reply
Old Jan 29, 2014 | 10:11 PM
  #15  
JBGold07's Avatar
JBGold07
Instructor
10 Year Member
 
Joined: Feb 2013
Posts: 210
Likes: 3
From: GTA Canada
Default

The belt appears to be riding the front lip of the passenger cam gear? Im guessing there is a fault somewhere, is this a common failure at the tensioner or water pump pulley? or even oil pump pulley? My 86.5 is exactly the same
Reply



All times are GMT -3. The time now is 04:27 PM.

story-0
10 Best Non-Flat Six Porsches You Can Buy For Under $100K

Slideshow: If you have $100K to spend on a Porsche but want something a little different, these are the 10 best non-flat six Porsches you can buy.

By Joe Kucinski | 2026-05-28 15:36:11


VIEW MORE
story-1
Porsche's Top 5 Most Questionable Naming Decisions

Slideshow: For a company obsessed with engineering precision, Porsche has occasionally named its cars in ways that left even loyal enthusiasts scratching their heads.

By Verdad Gallardo | 2026-05-27 18:43:48


VIEW MORE
story-2
Pogea Racing's 964 Porsche 911 Reimagination Stands Out in a Crowded Field

Slideshow: Pogea Racing's latest Porsche 964 project blends carbon-fiber construction, modern chassis upgrades, and up to 500 horsepower while keeping the air-cooled 911 experience firmly analog.

By Verdad Gallardo | 2026-05-23 10:34:27


VIEW MORE
story-3
6 Convertible Top MYTHS Most People Don't Understand!

Slideshow: dispelling common convertible top myths

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-4
2026 Porsche 911 Club Coupe is Spectacular, And Everything Wrong with the Porsche Market

Slideshow: The 2026 Porsche 911 Club Coupe is being resold $150K above sticker and that is a real problem.

By Joe Kucinski | 2026-05-21 11:52:54


VIEW MORE
story-5
Talos Takes Your 991 Porsche 911 GT3 to the Next Level for a Cool $1.13 Million

Slideshow: Talos Vehicles has transformed the Porsche 911 GT3 RS into a carbon-bodied, race-inspired machine that costs well over $1 million before the donor car is even included.

By Verdad Gallardo | 2026-05-19 13:39:04


VIEW MORE
story-6
9 Vehicles Porsche Helped Engineer that Aren't Porsches

Slideshow: Long before engineering consulting became trendy, Porsche was quietly helping other automakers build everything from supercars to economy hatchbacks.

By Verdad Gallardo | 2026-05-15 12:44:44


VIEW MORE
story-7
9 Features and Characteristics That Only Porsche People Understand

Slideshow: Some brands build cars. Porsche builds traditions, obsessions, and a few habits that stopped making sense decades ago but somehow became part of the charm.

By Verdad Gallardo | 2026-05-13 18:46:13


VIEW MORE
story-8
I've Written 500 Rennlist Articles: Here's How Porsche Has Changed Along the Way

Slideshow: Six years and 500 Rennlist articles later, these are the biggest changes at Porsche.

By Joe Kucinski | 2026-05-11 09:52:55


VIEW MORE
story-9
10 Most Unnecessary Porsches Ever Built (And Why We Love Them)

Slideshow: Some Porsches exist for very specific reasons-others feel like they were built just to see if anyone would notice.

By Verdad Gallardo | 2026-05-06 18:00:32


VIEW MORE