Engine guys... - Pirate4x4.Com : 4x4 and Off-Road Forum
 
Pirate4x4.Com : 4x4 and Off-Road Forum  

Go Back   Pirate4x4.Com : 4x4 and Off-Road Forum > Brand Specific Tech > Jeep - Non Hardcore
Notices

Reply
 
Share LinkBack Thread Tools Display Modes
Old 03-28-2013, 06:50 PM   #1 (permalink)
Registered User
 
Join Date: Aug 2012
Member # 226215
Location: The South
Posts: 1,628
Engine guys...

I bought a amc360 140k miles it ran fine and sounded good.

At home on the engine stand all cylinders read between 145 psi and 140 psi except one It's at 90 psi.

What's the chances it just needs a valve job?

I really don't have room in my budget for a rebuild at this time.
__________________
But not really.
Nixer600 is offline   Reply With Quote Quick reply to this message
Old 03-28-2013, 07:12 PM   #2 (permalink)
Insurance poor
 
Rttoys's Avatar
 
Join Date: Aug 2009
Member # 140853
Location: Waller, TX
Posts: 9,954
Pull the 2 rocker arms. Take the schrader valve out of your compression tester, pull the spark plug, install the comp tester, connect an air hose and listen for air in the crankcase, intake or exhaust. Takes the guessing out without any cost.
__________________
'80 CJ7- soon to start project "always changing directions"

'84 CJ7- all stock farm rig, except a bunch of gun racks

'79 CJ5- not stock- way too much to list
Rttoys is online now   Reply With Quote Quick reply to this message
Sponsored Links
Old 03-28-2013, 08:26 PM   #3 (permalink)
Registered User
 
Join Date: Aug 2012
Member # 226215
Location: The South
Posts: 1,628
Quote:
Originally Posted by Rttoys View Post
Pull the 2 rocker arms. Take the schrader valve out of your compression tester, pull the spark plug, install the comp tester, connect an air hose and listen for air in the crankcase, intake or exhaust. Takes the guessing out without any cost.
So I could listen in the oil fill hole.
Or In The carb or in the exhaust port right? Those are acceptable listing points right?
__________________
But not really.
Nixer600 is offline   Reply With Quote Quick reply to this message
 
Old 03-28-2013, 08:40 PM   #4 (permalink)
Insurance poor
 
Rttoys's Avatar
 
Join Date: Aug 2009
Member # 140853
Location: Waller, TX
Posts: 9,954
Yep.

Although, on a cold engine, you will get some noise in the crankcase. So listen more in the carb and tailpipe to prove a valve problem. Also, you can pull the rad cap, if there are bubbles, you have more problems, but you never said anything about water/oil mixing.
__________________
'80 CJ7- soon to start project "always changing directions"

'84 CJ7- all stock farm rig, except a bunch of gun racks

'79 CJ5- not stock- way too much to list

Last edited by Rttoys; 03-28-2013 at 08:42 PM.
Rttoys is online now   Reply With Quote Quick reply to this message
Old 03-28-2013, 08:51 PM   #5 (permalink)
Registered User
 
Join Date: Mar 2003
Member # 17632
Location: West Sacramento, CA
Posts: 8,361
If I heard this engine run and was happy enough to buy it, I would most likely run it as-is. But that's just me.
Travis..
__________________
18 Ram 2500 4x4 Big C and a 6 speed
73 Dodge W100, 400 4spd, stepside project
crashnzuk is offline   Reply With Quote Quick reply to this message
Old 03-29-2013, 01:05 PM   #6 (permalink)
Registered User
 
Join Date: Aug 2012
Member # 226215
Location: The South
Posts: 1,628
I can't hear any air coming out any of the locations. Any thoughts?
__________________
But not really.

Last edited by Nixer600; 03-29-2013 at 03:12 PM.
Nixer600 is offline   Reply With Quote Quick reply to this message
Old 03-29-2013, 03:13 PM   #7 (permalink)
Registered User
 
Join Date: Aug 2012
Member # 226215
Location: The South
Posts: 1,628
Well I got my wife to help and she heard it at the exhaust valve.

Thanks for the help.
__________________
But not really.
Nixer600 is offline   Reply With Quote Quick reply to this message
Old 03-29-2013, 06:45 PM   #8 (permalink)
Registered User
 
Join Date: Mar 2003
Member # 17632
Location: West Sacramento, CA
Posts: 8,361
Take the valve cover off and smack the valve with a rubber mallet while you have air on the cyl to see if the air noise goes away. There may just be a peice of carbon/crud in the valve that will get blown out as soon as you unseat the valve.
Travis..
__________________
18 Ram 2500 4x4 Big C and a 6 speed
73 Dodge W100, 400 4spd, stepside project
crashnzuk is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Pirate4x4.Com : 4x4 and Off-Road 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.

** A VERIFICATION EMAIL IS SENT TO THIS ADDRESS TO COMPLETE REGISTRATION!! **

Email Address:
Insurance
Please select your insurance company (Optional)

Log-in


Thread Tools
Display Modes

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



All times are GMT -7. The time now is 04:42 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 ©2011, Crawlability, Inc.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.