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Old 12-04-2011, 06:06 PM   #1
Join Date: Nov 2011
Location: staten island,NY
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Having problem with my 90' yj 4.2 straight 6....loud ticking noise..probably a lifter or valve adjustment im being told. How would I adjust these valves? Haynes doesn't say and im no mechanic. People say its not that hard to do on my own...what r the steps? And where do I measure with feeler gauge? Also,now it wont start and sounds real funny when it turns over...almost like that bad starter whizzing noise...but its not the starter. Please advise

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Old 12-04-2011, 07:47 PM   #2
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the firt thing i would do is a engine compression test

i'ts hip to be square
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Old 12-05-2011, 11:23 AM   #3
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your not starting issue could be gears missing on the flywheel... or a bad throw out gear on the starter itself. Test your battery first though just to be sure.

As for adjusting the valve clearance, I did this write up awhile back.

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1994 Wrangler YJ I6 4.0 H/O Auto 3 spd. 4" RC (33x12.5) (15x8) 3:54 Gears
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Old 12-05-2011, 04:52 PM   #4

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You don't "adjust the valves" on your engine at all! You have a hydraulic valve train, so they are adjusted at the factory when they put the motor together. Unless you have put in new lifters, you are good to go. The only exception would be if one of the lifters went bad.

The "hydraulic lifters" are located on top of the camshaft. They are little hydraulic lifts that push up on "push rods". The push rods push into one side of the "rocker arm" which acts as a "seesaw". The other side of the rocker arm pushes down on your "valve stem". This in turn opens the "valve" and allows your fuel mixture to come into the cylinder for combustion.

The only adjustment that I am aware of in this type of situation is when you put in new lifters (done when you swap out camshafts or if a lifter went bad.) The manual will tell you to tighten the nut on the rocker arm so many turns. This tightens up the rocker arm to its stud which also adjusts the valve train. Once you have all of them set (per factory guidelines), you start up the engine with the valve cover removed. If there is any "clicking" you go to that rocker arm and tighten down the nut some more, generally until it stops clicking.

You may have bad lifters. If that is the case, I would replace all of them since they all get the same wear on them. The lifter manufacturer will have the installation guidelines on the lifters and can help you more.

Take care,
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Check "WWII Willy's restoration and usage..." if you want to see THE ORIGINAL JEEP IN ACTION.
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