4.0 I.6 makin ticking sound??
11-26-2011, 11:40 AM
#31
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Location: Nor-Cal
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Year: 1990
Model: Cherokee
Engine: The venerable 4.0
Originally Posted by camoed90XJ
well I have had to work on a customer jeep and he was complaining about a tick, that gets worse as it gets cold. could definitely tell it was coming from the top end, which leaves valve train to be suspected. there are a couple different TSBs available for these types of noises. one in particular stuck out in my head. the line boring on the block for the cam was done wrong and the cam was allowed to move back and forth hitting the timing cover which had a possible fix of putting a new cam bolt in. the other fix which is what i did to this jeep was a valve rotation. although this is mostly associated with a misfire problem it can cause a noise. the 4.0 causes so much carbon build up that the valve get large deposits and can no longer rotate the will eventually start to stick, its as simple as removing the valve cover and inspecting the tappet it should have a round wear mark on the top of it indicating the valve is spinning if it doesn't a valve rotation should be done. i believe there was also another TSB involving the distributor and how it picks up its timing causing noise. a mechanics stethoscope becomes very handy looking for these noises.
11-28-2011, 10:44 AM
#32
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Model: Cherokee
the valves need to be spun 90 degrees. sorry also have to remove rocker arms. its not the tappet since its a push rod motor that was my mistake. its the actual valve stem. circular wear pattern indicates a spinning valve. i am assuming you mean roller rockers multiple companies make them. have no experience with any of them therefore have to opinion or suggestions to make, just google it
03-22-2018, 02:42 PM
#34
Newbie
Ticking sound...
If it is the evap solenoid, would the ticking stop when increasing the rpm? On mine it ticks very bad when cold. Seems like it takes a while to stop, it acts like a bad lifter, if so it would not go away, correct? If it were a lifter would changing the viscosity of the oil change the characteristic of the noise?
03-23-2018, 09:47 PM
#36
CF Veteran
Yeah... what's considered a normal tick for these 4.0s? say like a '99? and what is a possible indicator that something needs to be looked at further?
I know coming from building and running inline 4's for performance for ones with the newer VVTi. Those can sound really odd at idle but is perfectly normal for that design.
I know coming from building and running inline 4's for performance for ones with the newer VVTi. Those can sound really odd at idle but is perfectly normal for that design.
03-25-2018, 04:58 PM
#37
CF Veteran
the valves need to be spun 90 degrees. sorry also have to remove rocker arms. its not the tappet since its a push rod motor that was my mistake. its the actual valve stem. circular wear pattern indicates a spinning valve. i am assuming you mean roller rockers multiple companies make them. have no experience with any of them therefore have to opinion or suggestions to make, just google it
So ..how do you rotate a valve with the spring and keepers installed?
If you rotate it because carbon is holding it in one spot, is the purpose to break a chunk of carbon off the valve?
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