Forums
New posts
Search forums
Image search
Shop
Amazon Store
T-Shirts
Stickers
Members
Current visitors
Supporting Member Upgrade
Sponsors
About
Log in
Register
Search
Search titles only
By:
Search titles only
By:
New posts
Search forums
Image search
Search
Search titles only
By:
Search titles only
By:
Menu
Install the app
Install
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Jeep Wrangler YJ
YJ General Discussion
New Cam, Timing Chain & Head. #1 No Compression
Reply to thread
Message
<blockquote data-quote="Gilaguy23" data-source="post: 429503" data-attributes="member: 19498"><p>If im not mistaken the 258,2.5 and 4.0 are non interference engines. That being said slipped or a broken timing chain or gears should have not caused valves and pistons to collide but compression would be affected on several cylinders if not all possibly. far as no compression,back firing and fireballs it sounds like the cam and ignition timing is off. Might try removing the rocker assembly which should close all the valves 100% and do a leak down test. That would tell at least if there is a bad valve,gasket or??. Not to be a black cloud,but new and/or rebuilt means a 50/50 change its right. If the leak down comes out good then on to plan B. IIRC Ive read many guys complain about bad timing gear marks which caused timing off 180 degrees. If that's the case you'd have to pull the TC cover off and reset cam to piston position to start and go from there. Forgive any mistakes, er...Ive had a few this afternoon. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3994" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="Gilaguy23, post: 429503, member: 19498"] If im not mistaken the 258,2.5 and 4.0 are non interference engines. That being said slipped or a broken timing chain or gears should have not caused valves and pistons to collide but compression would be affected on several cylinders if not all possibly. far as no compression,back firing and fireballs it sounds like the cam and ignition timing is off. Might try removing the rocker assembly which should close all the valves 100% and do a leak down test. That would tell at least if there is a bad valve,gasket or??. Not to be a black cloud,but new and/or rebuilt means a 50/50 change its right. If the leak down comes out good then on to plan B. IIRC Ive read many guys complain about bad timing gear marks which caused timing off 180 degrees. If that's the case you'd have to pull the TC cover off and reset cam to piston position to start and go from there. Forgive any mistakes, er...Ive had a few this afternoon. ;) [/QUOTE]
Verification
Post reply
Forums
Jeep Wrangler YJ
YJ General Discussion
New Cam, Timing Chain & Head. #1 No Compression
Top
Bottom