1994 grand cherokee 4,0 valve tape

[Johnson110]

hello, i own a 1994 jeep 4.0 125k miles has valve tap, brought it w/ 110k on it, engine truck very clean, question can i run engine cleaner it w/o harming engine, currently using 10w 30 oil can i use heavier oil? great truck thnak for any input on this one

 

[Skinnywater]

Re: 1994 grand cherokee 4,0 valve tape

"Cleaners" are more likely to do more harm then good.<br />Aside from fixing the actual problem, camshaft/lifter/rocker shaft wear, a fresh oil change would do the most good.<br /><br />By all means throw your money away at all the suggestions of fixalls and snake oils that are likely to follow.

 

[LubeDude]

Re: 1994 grand cherokee 4,0 valve tape

Can we be a bit more specific? Does it do it all the time or just at start up? How long has this been going on? I do know that these engines like a 40 weight oil, In that range, I would recomend Chevron Dello 400, Yes, I know it is a deisel oil, but it has high detergents and a great aditive package! Also it is a Hydrocracked conventional oil that makes it as close to a synthetic as you can get and not pay the price of a full synthetic! Very Good oil! They have a 5W30 if you can find it, might be better for the winter! 15W40 in the summer! <br /><br />Also if it is at startup, it could be the brand of filter you are using, this engine I beleive has the filter on the side, You need a good anti drain valve on these engines! Pure one or a Wix (Napa Gold) will be fine! If you have a Fram on there now, I guarentee its junk!

 

[crazy charlie]

Re: 1994 grand cherokee 4,0 valve tape

Johnson110,dont sweat it if the motor makes a bit of a "deisely" noise.Many folks think they have a problem with those motors but they are designed to sound that way.They all do until 1996 when they shortened the pistons.Charlie

 

[mellowyellow]

Re: 1994 grand cherokee 4,0 valve tape

used it when i was young and stupid on an old<br />pontiac 326 motor and the motor froze up....<br />i would say no.

 

[Johnson110]

Re: 1994 grand cherokee 4,0 valve tape

thanks for reply folks engine taps all the time using 10-30 with purolator filter, fram stinks. put some marvel mystry oil in it will see if it quiets it down some, brought truck w/ 110k on it had valve tap when i purchased it.

 

[JasonJ]

Re: 1994 grand cherokee 4,0 valve tape

What does the oil pressure guage say when it is warmed up? If it has decent pressure, I wouldn't sweat it. I am trying to remember if the 4.0 needs periodic valve adjustments or if it has hydraulic lifters. My better halfs rig is a 93 Grand Cherokee with 4.0 and the engine runs quiet except for right after startup there is a faint ticking but once oil pressure comes up it is quiet.

 

[Johnson110]

Re: 1994 grand cherokee 4,0 valve tape

Jason, I have about 60-65 lbs cold, appox 30 lbs hot idle, tap the pedal hot her pressure jumps right up, put some marvel mystry oil in crankcase, to see what happins, i think they all develop a tap at high miles.

 

[Skinnywater]

Re: 1994 grand cherokee 4,0 valve tape

i think they all develop a tap at high miles.

Your correct here, and most do. It's something that souldn't concern you a great deal.<br />It certainly isn't something that is designed into it. <br />The mystery oil won't compensate for the valve train wear.<br />I'm just glad you didn't open a can of worms by using the "cleaner".<br /><br />At 130K our Wrangler had a mess of oil leaks and an exaust manifold was cracked and lifter noise.<br />I did a valve job, a mild off-road cam with lifters, resealed the motor. It purrs @160K.<br />Since I've done all the mods, suspension/3" lift, Eagle radiator, added A/C, 2.5" exaust, rear locker. I'll probably keep it forever.<br />The wife keeps the C-class in the garage and uses the YJ as her daily driver.

 

[JasonJ]

Re: 1994 grand cherokee 4,0 valve tape

Your oil pressure sounds good. You want to have at least 10 pounds per 1000 rpms. Have you checked for exhaust leaks? A bad exhaust manifold gasket can give you a constant ticking sound.