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post #1 of (permalink) Old 04-14-2003, 12:50 PM
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adjusting the valves on my 258

I'm getting a ticking sound at the top of my engine. The sound has been there for a while and I'm starting to think that I really should do something about it... [img]images/graemlins/crazy.gif[/img] After checking with a steth, I'm pretty sure I need a valve adjustment/valve job. The sound has been there for a while and I'm starting to think that I really should do something about it, like maybe adjust the valve clearances or something. I'd like to do it myself, to learn how and to save money, but I can't find the clearances in my usually-trusty Haynes manual. Any thoughts, links, anything?
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post #2 of (permalink) Old 04-14-2003, 01:36 PM
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Re: adjusting the valves on my 258

They are hydraulic (lifters) and no provision is made for adjustment. If there is excessive clearance causing the ticking, one or more of the parts in the valvetrain have worn and require replacement. (Assuming normal oil pressure is available to make the lifters work).

I'd remove the valve cover and find out which valve is making the noise. You can run the engine this way, but watch out for oil spurting out the tops of the pushrods. A little strip of plastic sheeting will help. I use the woodend end of a hammer against the rocker arm. You will press down and it will dampen out the noise when you find the right one. Can you feel clearance or a collapsed lifter? If not, you can swap the rocker and pushrod from another valve to see if that moves the noise around. If not, use a dial indicator to measure valve lift to see if the lobe on the cam is going flat.

If the cam lobe is alright, or if the lifter is collapsed, it's time to remove the cylinder head and replace the suspect lifter. I had to do that on my engine and it cured the noise. For some reason, after a rebuild, one of the replaced lifters just wasn't doing it's job right. Cured that annoying tick.
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post #3 of (permalink) Old 04-16-2003, 08:23 AM
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Re: adjusting the valves on my 258

Could it be that one or more of your Valve springs have worn out?
This might be a good opertunity to upgrade to a forged roller rocker with a little be larger ratio, and some heavy duty valve springs. That could open up some HP, and eliminate the noise.
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post #4 of (permalink) Old 04-17-2003, 01:03 PM
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Re: adjusting the valves on my 258

If it's been like almost a decade since you've last done any work with your valves it might be worth investigating but according to the "Jeep Bible" us 6cyl 258 owners don't have to worry about adjusting valves because they are made to be "auto-adjusting". [img]images/graemlins/grin.gif[/img]
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