Cam gear removal - Pontiac GTO Forum
User Tag List

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 12 (permalink) Old 03-12-2015, 05:57 PM Thread Starter
 
kilkm68's Avatar
 
Join Date: May 2011
Location: Peoria, IL
Posts: 217
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Cam gear removal

Trying to put a new timing chain in my
70-455. After removing the fuel pump eccentric I cant get it to budge. Is there anything else Holding the gear on? I didn't want to use too much force till I get some advice.
kilkm68 is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 03-12-2015, 06:01 PM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,470
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 98 Post(s)
You need to walk off both gears at the same time, crank and cam. Two small breaker bars work fine. I've never needed a puller. It's a somewhat tight fit.
geeteeohguy is online now  
post #3 of 12 (permalink) Old 03-13-2015, 01:51 PM Thread Starter
 
kilkm68's Avatar
 
Join Date: May 2011
Location: Peoria, IL
Posts: 217
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Still no luck. Cut the chain off, crank gear slid right off but the cam gear won't budge. Very little room between gear and block on this 455, not enough to get the jaws of my puller behind it without grinding them way down. Teeth aren't bad, I may just leave it on and put the new chain and bottom gear on. I'd still like to know why I can't get this gear off, first time I've done this. I'm sure I could get it off with some big time pressure but I don't want to take a chance of damaging the camshaft or bearings, and the gear still appears to be serviceable.
kilkm68 is offline  
 
post #4 of 12 (permalink) Old 03-13-2015, 03:06 PM
 
rickm's Avatar
 
Join Date: Feb 2012
Location: new york state
Posts: 633
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
don't leave the old cam gear on.
rickm is offline  
post #5 of 12 (permalink) Old 03-13-2015, 03:25 PM
Former Super Moderator
 
Rukee's Avatar
 
Join Date: Feb 2007
Location: South Central Wisconsin
Posts: 9,919
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
The old gear will wear the new chain out in short time, plus you'll probably not be able to get it on anyway. I've always been able to use a pry bar on each side of the gear and wiggle it left to right to get it off. It may be stuck good, but it should come off. You might want to maybe apply some heat to the gear around the outside of were it fits over the cam then pry.
Rukee is offline  
post #6 of 12 (permalink) Old 03-13-2015, 03:56 PM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,470
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 98 Post(s)
What Rukee said. A fresh chain will not go on with the cam gear in place....not enough slop in the chain. You must replace that cam gear. Try some rust penetrant, gentle tapping, and walking it off with two opposed prybars. It will come.
geeteeohguy is online now  
post #7 of 12 (permalink) Old 03-13-2015, 04:30 PM Thread Starter
 
kilkm68's Avatar
 
Join Date: May 2011
Location: Peoria, IL
Posts: 217
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Thanks guys, appreciate your advice. Try again Sunday
kilkm68 is offline  
post #8 of 12 (permalink) Old 03-13-2015, 06:29 PM
 
PontiacJim's Avatar
 
Join Date: Dec 2012
Location: Gastonia, NC - Born & raised in Connecticut - 31 years
Posts: 3,541
Mentioned: 1 Post(s)
Tagged: 1 Thread(s)
Quoted: 361 Post(s)
Garage
I've had to fight with them myself. Sliding off the keyway is the problem. Here is a consideration you might try. Look at your cam/gears to see if this might work.

Put the bolt back into the cam to protect the threads. You will need 2 chisels or big screw drivers that you can wedge between the cam gear and block, something you can tap in to put some pressure on them - not killer pressure, just a reasonable amount (never heard of a block cracking from this, but just be careful). Then I would find a big socket that will go over the cam bolt and be large enough in diameter to still fit within the inside diameter of the cam gear.

With some pressure being applied to the cam gear on each side from your "wedge" you tapped in, give a couple good solid hits to the socket. You are trying to "shock" the gear loose off the keyway using the wedge to force it forward while hitting the cam to force it backward. After a couple good hits, if it still does not move, tap the "wedges" in a little tighter. Hit the socket again with some good hits. I would also hit the cam gear a few good times on the teeth edge where the wedges are not at. This may rock the gear just enough while they are on the "wedges."

If no luck, move the "wedges" 90 degrees to another location (or turn the cam 90 degrees) and repeat. Sometimes you have to rotate your "wedges" at different points on the gear to get it loose by applying pressure at other points on the gear. Repeat above.

If you put an uneven pressure on one side of the cam gear or the other, you will be tilting the gear and this will only make it more difficult for the gear to pop off. So it is always best to use identical type "wedges" to give you an idea that you are getting the same kind of even pressure.

You might even consider a little heat from a propane torch by applying heat around the gear just outside of the camshaft while you have your wedges inserted. You want to keep the camshaft cool and heat in a circular motion the metal adjacent to the cam. You are trying to expand the metal just a hair. Then give the camshaft a pop to break it loose from the gear.

A puller should work -although I have never used one on a cam gear, just a lot of prying. Have you tried your local auto store to see if they may have a puller that would work? My parts store has free loaner tools that you simply put a deposit on and get refunded once you return the tool. You might find one large enough to grab the outside of the gear.
PontiacJim is offline  
post #9 of 12 (permalink) Old 03-13-2015, 06:57 PM Thread Starter
 
kilkm68's Avatar
 
Join Date: May 2011
Location: Peoria, IL
Posts: 217
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Great advice Jim, thank you. I have a puller big enough but there's so little room between the gear and the block the arms won't fit. I've borrowed tools from advance auto before I might see what kind of pullers they have and use a little heat when I get back in town. It's gotta come off, one way or another.
kilkm68 is offline  
post #10 of 12 (permalink) Old 03-17-2015, 12:14 PM Thread Starter
 
kilkm68's Avatar
 
Join Date: May 2011
Location: Peoria, IL
Posts: 217
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
Finally found the right style puller and the cam gear pulled right off. Thanks everyone for your advice.
kilkm68 is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Engine Tuning and High Performance

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Using Loctite when replacing timing chain upper cam gear RM9700 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion 2 10-23-2014 02:30 PM
Speedometer Drive Gear and Driven GEAR timmyg 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring 3 05-05-2012 03:48 PM
Cam removal orelog 1964-1974 Tempest, LeMans & GTO Engine Tuning and High Performance 7 02-24-2012 05:59 PM
Cam Chose ms4 vs livernois strage 2r cam GTOMOE9 Engine Discussions 7 03-08-2011 10:20 PM
cam or gear upgrade? Kurtherogto 2004-2006 GTO General Discussion 8 03-18-2009 12:02 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome