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Unread 04-08-2013, 05:44 AM   #1
jdhaas3
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AMC 258 Rocker fix - ticking noise

My jeep has had a small tick coming from the valve train since I bought it. I changed the oil in my jeep for the first time since I have owned it this last weekend and the tick has gotten noticably louder now. I am running 10W-30 with some Marvel Mystery in it, I can only assume the PO was running heavier oil to help mask how loud the tick was.

This coming weekend I am going to pull the valve cover off and scrape off all the blue RTV that was used (no gasket) and check out the rockers. I know there is a long list of things to look as to what can be causing the tick, especially when taking over some persons previous project. I am just looking for a few of the normal culprits to check for. I am hoping it is just a worn pivot (seems fairly common when I searched) or something easy and cheap to fix.

We are also going to install the HEI, new plugs, check the compression and set the timing. Any and all advice is appreciated. Thanks in advance!

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Unread 04-08-2013, 09:58 AM   #2
jdhaas3
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Anybody replaced rockers lately from a mostly stock 258?
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Unread 04-08-2013, 10:15 AM   #3
Jon In Tucson
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Quote:
Originally Posted by jdhaas3 View Post
Anybody replaced rockers lately from a mostly stock 258?
Not the rockers, but you might look at the the pushrods. While you have the valve cover off, turn the engine over and check the pushrods for looseness. There are different lengths used over the years. It is possible that one or more is short. The short pushrod can cause the click or tic you hear. That sound could come from a collapsed lifter also, where it doesn't pump up. If you start the engine up without the valve cover on, be prepared for an oily spray. It is amazing just how much oil can get all over everything and you... God bless.
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Unread 04-08-2013, 12:57 PM   #4
Blue83CJ7
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Also interested in this one since I have a bad tick when hot...

My wife and kids are going away for 2 weeks so I will have some garage time and looking for a small project.


How do you tell if the lifter is collapsed without pulling the head?

Just run it to pump them up pull the cover and check pushrods for looseness?

Should they also pump up if you prime it with the cover off? Not really thrilled about running it with the valve cover off.
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Unread 04-10-2013, 10:07 AM   #5
capt205
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Rockers and pushrods are easy to change. Had to replace a couple of each, recently when the pusrods bored right throught the rockers. It did it again within 2 or 3 days...turns out, the OP gauge was broke and I just assumed it had pressure...NOT. The second time it collapsed and destroyed a lifter.

So...I put in a new Mellings HV 4.0 oil pump with a 4.2 pickup, replaced the lifter and 1 rocker and pushrod. Filled her up wih 15w-40 Rotella, a new filter, and a new OP gauge...40psi cold, and once its good and warmed up, it idles with 18psi, and upward of 50-60 when getting down the road.
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Unread 04-10-2013, 11:34 AM   #6
Caish
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I doubt either of its going to cure it.
Lifters are weak and they allow a little extra clearance thus the tick.
You can here several of mine.
http://youtu.be/t1L-gb1lqDI
About the only way I've heard to cure it is replace the lifters.
Its on my todo list and actually plan on doing it when I change out to a 4.0 head.
All in good time right.
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Unread 04-10-2013, 09:11 PM   #7
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My engine likes 10-w40, even after a fresh rebuild. 10-w30 gets pretty thin after the engine warms up and the oil pressure may drop to single digits at idle, that's when you know your engine likes heavier oil.
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Unread 04-10-2013, 09:51 PM   #8
Caish
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After a rebuild if I lost oil pressure like that I would be pulling it down and plastigauge the clearances because something is wrong...
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Unread 04-11-2013, 12:17 AM   #9
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Mine runs rather low pressure. Maybe 30 PSI on startup and 8 or 10 idling when warm. I had a knock that was VERY loud (like you could hear it a half a block away) at one point. Been running Rotella 15W-40 with a pint of Marvel Mystery Oil and the knock is basically gone. It runs fantastic. Without the MMO the knock does come back a little bit.
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Unread 04-11-2013, 12:23 AM   #10
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Quote:
Originally Posted by sanddrag View Post
Mine runs rather low pressure. Maybe 30 PSI on startup and 8 or 10 idling when warm. I had a knock that was VERY loud (like you could hear it a half a block away) at one point. Been running Rotella 15W-40 with a pint of Marvel Mystery Oil and the knock is basically gone. It runs fantastic. Without the MMO the knock does come back a little bit.
I would drop the pan and roll in a set of new bearings. You have at least one bearing that is ready to spin and possibly ruin a crank..
You can change all of them without pulling the crank.
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Unread 04-11-2013, 12:28 AM   #11
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Quote:
Originally Posted by Caish View Post

I would drop the pan and roll in a set of new bearings. You have at least one bearing that is ready to spin and possibly ruin a crank..
You can change all of them without pulling the crank.
For what its worth I replaced my oil pump + all my rod and main bearings and got a little oil pressure back, but it still ticks when it warms up and drops to 5 at idle, 15 at 2100rpm.

It runs fantastic though, so I haven't looked into it since the bearings but I was told the cam bearings are a bigger source of oil pressure drop.

:shrug
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Unread 04-11-2013, 04:33 AM   #12
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Ok guys I had the same problem in my cj7 when it had an older 232 in it. I changed the pushrods and put in a melting high volume oil pump to. After all that I cam to the conclusion of the lifters being bad. I ended up rebuilding a 258 cause 2 pounds of oil pressure hot is just bad and after putting in that money was a waist of my time. Lifters are pretty easy to tell you'll notice it and I think I had some YouTube videos on my lifter noise I'll post it if I find it. If you have all these symptoms then I would just rebuil it cause chances are that she's wore pretty far, my timing chain was so loose it shaved the timing cover aluminum and Ruined all my bearings.
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Unread 04-11-2013, 04:43 AM   #13
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Here's my engine with the bad lifters, take a listen and see if it's anything like you got
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Unread 04-11-2013, 04:46 AM   #14
jdhaas3
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I have good oil pressure the whole time....according to the gauge...usually sits around 40lbs. This was the first oil change I did since changing the vehicle, I will change the 10w-30 out for 15w-40 this weekend with a little MM in it. Hopefully it isnt anything major when I pull the valve cover and check it out. At this point I just want to drive this thing, I can live with the ticking as long as it isn't horribly loud.
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Unread 04-11-2013, 08:22 AM   #15
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Quote:
Originally Posted by capt205 View Post
Rockers and pushrods are easy to change. Had to replace a couple of each, recently when the pusrods bored right throught the rockers. It did it again within 2 or 3 days...turns out, the OP gauge was broke and I just assumed it had pressure...NOT. The second time it collapsed and destroyed a lifter.

So...I put in a new Mellings HV 4.0 oil pump with a 4.2 pickup, replaced the lifter and 1 rocker and pushrod. Filled her up wih 15w-40 Rotella, a new filter, and a new OP gauge...40psi cold, and once its good and warmed up, it idles with 18psi, and upward of 50-60 when getting down the road.
tell me more about that oil pump, you mentioned the 258 pickup, do you just buy a Mellings HV 4.0 pump, and replace the pickup tube? or? I have also got that "TICK".. have to go into it and find it .. figured on changing the oil pump also, so... and valve cover gasket leaks at the back, so.... and....
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