knocking in a 304 once it warms up? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > WF Local > WF Local Forums for Your Region and State > Oregon Jeep Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-04-2012, 12:19 PM   #1
Newb
 
Join Date: Jun 2012
Posts: 1
knocking in a 304 once it warms up?

My 78' 304 apparently has 10k on motor since rebuild I was told when I bought it, It sounds very good when you start it except for when it warms up, it has a tick / knock once it heats up but the performance still seems good, we have checked the flywheel lifters rods rocker springs cam and all seem new, any suggestions on what else? wrist pin, bearings?

ront is offline   Quote Quick Reply
Old 06-04-2012, 08:38 PM   #2
Jeeper
 
Baby Huey's Avatar
 
Join Date: Feb 2012
Location: Western Washington County Oregon
Posts: 1,104
I have not rebuilt a 304, but I have rebuilt a 360 AMC engine in my old 73 Wagoneer.
AMC individually fits the Crankshaft Bearing at the Factory depending on how the crank pins and journals measure.
Unless your Crank was ground during the rebuild and ground to a next std. size .010" ,.020" undersize with new bearings, you may be hearing a little rod or main bearing noise.
You won't hear it too much when it's cold, a little more "Oil Cushion" , but after the oil warms up and thins out....Knock,Knock,....
Just an idea, I hope it's not a Crank, but I learned with those AMC engines to just grind em and get it over with ,no matter how good they look. The Fit size is on the back of the bearing shells, but you must put those shells back on the crank pin they came off of !! Can't mix nothin !! Same with Cam lobes, don't be mixing up the lifters, those go back on the same lobe they came off of !! Unless you put in new camshaft and lifters.
If it's a "Ticking" noise, then it's more than likely in the Valve Train.... You might remove a Valve cover and let it idle and listen for the Tick with the cover off, It'll make and oily ,smokey mess, but don't rev it up, just feel each rocker and put a little pressure on em to see if you can determine which is ticking.....Do one side at a time.
A cleaner way is to use a long screw driver and use it as a Stethascope, put the bit against the valve cover and the handle to your ear, move it along the valve cover until you find the lifter or rocker thats making the noise...
Hope this helps, Good luck .... Ohhhhh, Welcome to the Forum ! "BH"
__________________
07-JKU-X /Poison spider Evap.Skid/Master craft grab handles/Or-Fab spare tire-can carrier/ Gibson SS Duals/ Q-tec Floor Liners/Hidden Hitch Receiver/ AntennaX 7inch/ 48" Hi-Lift./ 8"X16"X4"bs Steel smoothie wheels/ 265X75R-16 Kelly Safari TSR tarz.

Viet Nam Veteran 69-70, Troop "D" (AIR) 3/4 Cav. ,25th Inf. Div. CUCHI RVN. UH-1H Crew Chief of the "Pinball Wizard" 68-16224. Call Sign "CENTAUR".
Baby Huey is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler 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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

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.



Thread Tools

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 Off
Refbacks are Off




» Featured Product

All times are GMT -5. The time now is 01:29 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC