Distributor Drive Gear Issue - JeepForum.com
 
LinkBack Thread Tools
post #1 of 10 Old 02-08-2016, 04:08 AM Thread Starter
Myjeep1986
Registered User
1986 CJ7 
 
Join Date: May 2013
Location: Ayer
Posts: 85
Cj Distributor Drive Gear Issue

I am sure its been discussed over and over as a problem, but I am hoping somebody has the permanent solution. I have now chewed up 2 gears. I do not believe I have short changed the products or the quality. Have a stock AMC 360, did the FI conversion (carb was RPIA), changed to a HEI.

When I had my 72 Wagoneer (2) and then an 86 Grand Wagoneer, never had an issue like this. Jeep looks great except it tends to spend more time on a flat bed and at shop.

Myjeep1986 is offline  
Sponsored Links
Advertisement
 
post #2 of 10 Old 02-08-2016, 06:30 AM
Matt1981CJ7
Web Wheeler
 
Matt1981CJ7's Avatar
1981 CJ7 
 
Join Date: May 2011
Location: Elbert
Posts: 16,455
It's a common problem with the cheap clone HEI distributors and AMC V8s.

You need to buy the drive and cam gear as a set to insure they don't eat each other up.

Summit sells them.

Matt
Matt1981CJ7 is offline  
post #3 of 10 Old 02-08-2016, 06:36 AM
jblue1555
Registered User
1979 CJ7 
 
Join Date: Aug 2006
Location: Topeka Kansas
Posts: 816
have you replaced the timing chain and gears in the past? if so your problem maybe there.
jblue1555 is offline  
post #4 of 10 Old 02-08-2016, 08:30 AM
texasdave
Web Wheeler
 
texasdave's Avatar
1980 CJ7 
 
Join Date: Dec 2007
Location: Killeen
Posts: 1,306
I agree with Matt. Most of the time it results in differing hardness of the two gears and the weaker one will crap out.
texasdave is offline  
post #5 of 10 Old 02-08-2016, 11:58 AM
AllenForaker
Registered User
1975 CJ5 
 
Join Date: Feb 2016
Location: Thatcher
Posts: 39
If you have destroyed two distributor gears, you need to give your cam drive gear a good looking at. I just replaced mine. When I put the new engine in back in 2010, I dropped in a new HEI from Jeggs and didn't know or care about the gear mesh, I just installed it and forgot about it. 7000 miles later my timing would not retard when idled down. Pulled the distributor and it's gear was in great shape. But, a look down at the cam gear showed razor sharp edges where the distributor gear had worn them down. I surmise this happened within the engines break in time because I had absolutely no metallic particles in the oil or filter when I pulled the timing cover. In that 7000 miles I have changed the oil twice and didn't think to check for particles in the break in oil. I replaced both gears with an MSD matched set, and they are not cheap and after about 20 engine hours now, no wear can be seen on either gear.

Allen
AllenForaker is offline  
post #6 of 10 Old 02-08-2016, 03:35 PM Thread Starter
Myjeep1986
Registered User
1986 CJ7 
 
Join Date: May 2013
Location: Ayer
Posts: 85
Thanks Allen, I need to check with my mechanic, thought we did that the first go around. I will keep you posted on the results.
Myjeep1986 is offline  
post #7 of 10 Old 02-09-2016, 07:41 PM
AllenForaker
Registered User
1975 CJ5 
 
Join Date: Feb 2016
Location: Thatcher
Posts: 39
I also fabricated a Timing Gear Oiler when I put it back together. Someone else's idea I read about somewhere, but it makes sense and it works.

Allen
AllenForaker is offline  
post #8 of 10 Old 02-10-2016, 01:07 AM
lucdog
Web Wheeler
 
lucdog's Avatar
1980 CJ5 
 
Join Date: Jul 2006
Posts: 8,762
Quote:
Originally Posted by jblue1555
have you replaced the timing chain and gears in the past? if so your problem maybe there.
Good question, and if the gear on the cam was changed, was the flashing cleaned out in the oil passage?

1957 WILLYS pickup,
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7
1989 YJ the CJ to YJ.
lucdog is online now  
post #9 of 10 Old 02-10-2016, 09:01 AM
Cashcrazy
Senior Member
 
Cashcrazy's Avatar
1983 CJ7 
 
Join Date: May 2013
Location: Tyler
Posts: 643
I just went through the something similar and was able to locate the issue. I wouldn't run it anymore until you located the issue. You don't want the metal particles getting pushed into the bearings.

If it was me this is what I would do... Go ahead and order a matched set of gears and a timing cover gasket set. I'd order a timing chain set also if you know the one in it is original with high mileage. Pull the accessories and timing cover and inspect the timing cover for anything unusual. The timing sprocket has a key way notch and an oil passage. Make sure these are installed correctly and the oil passage does not have flashing blocking the path. Check the new sprocket oil passage also. I cleaned the flashing up on mine with a small file before installing. I have read about people using a drill bit to test the hardness of the two gears. I would try this to see if one of the gears is a hardened steel and the other not. Otherwise you're just replacing the gears and hoping it doesn't happen again. I like to find the cause if possible. I have not done the HEI on a V8, but Think you have to get the AMC modified HEI with the correct shaft length and not just run the Chevy HEI like you can in the 258.

1982 CJ7(sold), 1983 CJ7(sold), 1989 YJ(sold), 1983 CJ7 undergoing frame-off.
Cashcrazy is offline  
post #10 of 10 Old 02-10-2016, 09:16 AM
Cashcrazy
Senior Member
 
Cashcrazy's Avatar
1983 CJ7 
 
Join Date: May 2013
Location: Tyler
Posts: 643
One other thing, put assembly lube on the new gears when installed. Don't want to run a new set dry at startup.

1982 CJ7(sold), 1983 CJ7(sold), 1989 YJ(sold), 1983 CJ7 undergoing frame-off.
Cashcrazy is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com 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 e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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



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 Off
Pingbacks are On
Refbacks are On

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