What does a bad lifter sound like? - Off-Road Forums & Discussion Groups
Go Back   Off-Road Forums & Discussion Groups > Jeep > Jeep-Short Wheelbase

Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 08-14-2006, 07:40 AM
Keyboard Implanted
 
Join Date: Aug 2001
Location: Vermont
Posts: 2,348
Thanks: 0
Thanked 0 Times in 0 Posts
Olin18 is an unknown quantity at this point
Default What does a bad lifter sound like?

I am getting a strange noise from my jeep, and I am pretty sure it is coming from the engine.
The motor I have in my Jeep is a 350. It has hydro lifters in it, and I am wondering if maybe one is bad? The engine only has 1700 miles on it at this point.
The noise I am getting only happens some times. The rest of the time the engine runs like a dream.
I think I would describe the noise as a "clatter" (it kind of sounds the same as when my last jeep had a cracked flex plate) (this Jeep is a standard, so it has no flex plate)

I get the sound, only when the RPM's in the engine are low, and the jeep is under hard accelerate.
So, say I am in 1st gear, and I shift into second, and apply a heavy throttle... I get a clatter for a bit. If I let off a little the clater will go away. And once the RPM's come back up a little, the clatter goes away.
The only other time I hear it is if I am in 4th gear, and I am going up a long hill.. If I apply more throttle, sometimes I will get the same caltter. Basically when the throttle (carb butterfly) is open more than needed for the given Motor RPM (under very low manafold vac) I seem to get this clatter.

I am hopefully going to get a local motor builder to go for a rid with me some time this week, or next. I would just like to be clued in a little before I talk to him about this.

Does this sound like maybe a bad lifter to anyone? Anyone have any other ideas?

Thanks for any help, I know that sounds are hard to diagnose in this manner, I figure I would try.
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 08-14-2006, 07:57 AM
CJ7Taz's Avatar
Official Curmudgeon
 
Join Date: Nov 2001
Location: Kansas
Posts: 4,684
Thanks: 1
Thanked 1 Time in 1 Post
CJ7Taz is an unknown quantity at this point
Default Re: What does a bad lifter sound like?

Sounds like timing knock to me.
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #3  
Old 08-14-2006, 08:19 AM
Keyboard Implanted
 
Join Date: Aug 2001
Location: Vermont
Posts: 2,348
Thanks: 0
Thanked 0 Times in 0 Posts
Olin18 is an unknown quantity at this point
Default Re: What does a bad lifter sound like?

Taz,
Thank you for the quick response.
I must admit that I have never heard of timing knock before. Can someone explain what it is? And how to go about fixing it?

It would make perfect sence if this was a timing issue. I had to replace the dist. about a month ago. I thought I had everything timed back in correctly but it seems like maybe I don't.

If what I am experencing is timing knock, how would I go about getting rid of it? I hope that I am not doing any damage to the engine in any way..

Thank you
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #4  
Old 08-14-2006, 08:27 AM
Addict
 
Join Date: Feb 2003
Location: Charlotte, N.C.
Posts: 556
Thanks: 0
Thanked 0 Times in 0 Posts
tincan is an unknown quantity at this point
Default Re: What does a bad lifter sound like?

Agree with Taz, knock can ruin any motor... so do not hit the throttle hard until you fix the problem...
Retard the spark.
Depending on what changes you have in the motor. You may have a knock sensor that is not working or not connected. Changing the distributor you may have the wrong spark advance curve.
I suggest you have the engine set up by some one who is qualified to check all of the above. A SUN Test meter is needed to do the complete check.
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #5  
Old 08-14-2006, 08:29 AM
Veteran
 
Join Date: Sep 2002
Location: Marion N. Carolina
Posts: 875
Thanks: 0
Thanked 0 Times in 0 Posts
Timber is an unknown quantity at this point
Default Re: What does a bad lifter sound like?

You're getting too much spark advance, from the distributor, at the wrong time, for the engine. You're probably getting to much total advance.

Your distributor needs to be tuned to your engine's needs.

I'm sure someone here can explain this better to you than me. It's not that complicated, or hard to do, most of the time. But someone who's very experienced at it, could explain it better.

Maybe someone will give you a link that explains how to correct it.
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #6  
Old 08-14-2006, 08:35 AM
Way Outta Control
 
Join Date: Sep 1999
Location: usa
Posts: 10,815
Thanks: 0
Thanked 1 Time in 1 Post
RRich is an unknown quantity at this point
Default Re: What does a bad lifter sound like?

Timing knock --- also known as "Ping."

Sounds like a bunch of marbles flying around.

Try something - remove distrubutor cap - note which way the rotor turns when you bump the starter.
Replace cap
move the distributor a little in the SAME direction the rotor turns.
Drive it - helps?
Keep doing that till it doesn't ping.
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #7  
Old 08-14-2006, 08:44 AM
Way Outta Control
 
Join Date: Sep 1999
Location: The Palouse
Posts: 13,392
Thanks: 0
Thanked 2 Times in 2 Posts
LEVE is on a distinguished road
Default Re: What does a bad lifter sound like?

The first thing you do is to trot down to your local autoparts store and buy a mechanics stethoscope for about $7. Then listen for where that noise is coming from, and under what repeatable circumstances. Otherwise <ul type="square">[*]your whistling in the wind..[*]it could be this...[*]it could be that...[*]it may be thus and so.[/list]You say the noise is only understandable at low RPM and under load. That's a clue, but it may also be noticeable using a stethoscope when the engine is not under load.

IMHO... more information is needed to determine the problem and it's fix.
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #8  
Old 08-14-2006, 08:52 AM
Way Outta Control
 
Join Date: Sep 1999
Location: usa
Posts: 10,815
Thanks: 0
Thanked 1 Time in 1 Post
RRich is an unknown quantity at this point
Default Re: What does a bad lifter sound like?

New distributor (discount store rebuilt?) -
Betcha -
1. intial timing too high
2. too much advance due to:
A. Wrong vacuum
B. Mechanical advance too fast/too much (light springs)
C. Vacuum advance diaphram moves to far.

An advance timing light would be very helpful.
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #9  
Old 08-14-2006, 11:15 AM
Keyboard Implanted
 
Join Date: Aug 2001
Location: Vermont
Posts: 2,348
Thanks: 0
Thanked 0 Times in 0 Posts
Olin18 is an unknown quantity at this point
Default Re: What does a bad lifter sound like?

Thank you all for the feedback. It sounds to me like what I have going on is Timing knock.
It sounds Exactly like a bunch of Marbles flying around.
My engine does not have a knock sensor, there is no computer.

I do have a stethoscope, and I have listend just about everywere I can think to listen with the jeep sitting in the driveway running. Nothing sounds funny until the engine is under a load.

I did replace the Dist with a rebuilt from a parts store.
There is a very good chance that my inital timeing is too high. This afternoon after work I will try turning the dist a little, and give it a drive. Hopefully that will do what I need, and eliminate the knock. I have never recurved a Dist before. It seems to be a confusing task from what I have read. If it comes down to that, I may need to seek help from a pro.

Hopefully all I need is a little turn of the dist.
thanks again for the help
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #10  
Old 08-14-2006, 11:17 AM
Keyboard Implanted
 
Join Date: Aug 2001
Location: Vermont
Posts: 2,348
Thanks: 0
Thanked 0 Times in 0 Posts
Olin18 is an unknown quantity at this point
Default Re: What does a bad lifter sound like?

I do have an advance timing light, but I have never used the "advance" before. I have only used it for setting inital timing..
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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 -5. The time now is 05:19 PM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.2.0
Copyright 1994-2009, VerticalScope Inc. // Off Road forums & discussion groups sitemap
side by side | atv | dirtbike | snowmobile | sandsport | competition | land use | Jeep | Toyota | Ford | GM