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-   -   Engine knock (http://www.wranglerforum.com/f218/engine-knock-19349.html)

nvr-enough 06-19-2008 09:36 PM

Engine knock
 
I've got a problem. The problem is that there is a knock coming from the engine. I thought it may have been the engine fans clutch, but i was wrong, so after replacing that the noises coming from the engine bay has become quieter. I think that it is probably the water pump because it has a slighty wobble when the engine is running. But is also sounds like the clunk could be coming from the top of the engine block. Any idea on how to fix the problem?:confused:

Triple88a 06-19-2008 09:52 PM

try filling with higher fuel octane.

yjwrangler 06-20-2008 04:49 AM

Lucas Oil!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

4.0l sahara 06-20-2008 10:27 AM

Quote:

Originally Posted by nvr-enough (Post 238687)
I've got a problem. The problem is that there is a knock coming from the engine. I thought it may have been the engine fans clutch, but i was wrong, so after replacing that the noises coming from the engine bay has become quieter. I think that it is probably the water pump because it has a slighty wobble when the engine is running. But is also sounds like the clunk could be coming from the top of the engine block. Any idea on how to fix the problem?:confused:

If you think the water pump is bad feel the shaft for play if there is some replace it. Puting higher octane fuel in isn't the solution. How many miles on it?:D

4.0l sahara 06-20-2008 10:28 AM

Take a srew driver and hold it to the block and put your ear up agaunst it and listen and locate the noise.

Triple88a 06-20-2008 04:40 PM

Quote:

Originally Posted by 4.0l sahara (Post 238773)
Puting higher octane fuel in isn't the solution.


how do you know his gas stations dont have 80 octane rating? :doh:

I'd put the best fuel you got and see if it still knocks (no need for a full tank, as long as you use up all or most of the lower octane stuff first). If it stops then i'd do a sea foam treatment to remove carbon deposits

4.0l sahara 06-20-2008 04:47 PM

ya but normally detonbation or pinging souds a little different than a heavy knock.

yjwrangler 06-20-2008 05:07 PM

been playin in water lately??? or have you not changed or checked the oil lately????

like i said. try lucas oil and see if it shuts up, my engine knocks, its all good has 104k on it, hell i hear some jeeps come from the factory with knock. could be valves, lifters, cam bearings, crank bearings... check your oil pressure every now and again, and keep up with oil!!!!!!!!!!!!

Triple88a 06-20-2008 05:29 PM

Quote:

Originally Posted by 4.0l sahara (Post 238827)
ya but normally detonbation or pinging souds a little different than a heavy knock.

Unless i missed it i dont think he said a heavy knock.:wavey:

yjwrangler 06-20-2008 06:21 PM

knock knock knock knock knock knock knock knock knock knock knock knock knock knock knock knock knock knock

jpdocdave 06-20-2008 09:40 PM

a slight knock is almost normal in 4.0's, very slight small knock is ok. nothing harsh, sharp, loud, or felt right?

you're so close i could take a listen if you'd like. i work in libertyville

yjwrangler 06-21-2008 12:15 AM

look if it don't sounmd like a diesel than it is fine, end of discussion, as a matter of fact i haven't heard one word out of our engine knock friend, wehre are you???? still knockin, put that lucas in yet??????????????????????????????????????????????? ??????????????????????????????

nvr-enough 06-25-2008 11:32 PM

wow, sorry bout me kinda disappearing from this thread, but tomorrow the plan is to replace the water pump to see if that will solve the problem. My sister is hoping cause she who drives it. We haven't tried higher octane yet. But if the water pump isn't the problem then we'll try that. And maybe i'll start checking my own threads more often:banghead: but thanks for the input. i'll keep you posted. And someone asked how many miles: 110,000ish

nvr-enough 06-26-2008 03:37 PM

so got off all the parts to replace the radiator to realize that we had ordered the reverse spin water pump instead of the forward spin:banghead:

Unheroic Hero 06-26-2008 07:21 PM

I don't see why you wouldn't try using higher octane fuel first. It's the cheapest option to try.

nvr-enough 06-26-2008 10:48 PM

Quote:

Originally Posted by Unheroic Hero (Post 241016)
I don't see why you wouldn't try using higher octane fuel first. It's the cheapest option to try.

honestly, i had forgotten all about this tread until last night:banghead: and by that point we already had gotten all of the parts for the new cooling system...if this doesn't work then that is first on the list.

89 strangler 06-27-2008 02:58 PM

Actually the cheapest fix would be to remove the belts and start the engine to see if the engine knocks.If it does it's in the engine.If it doesen't then it's in one of the components(such as pump)that are driven by the belt.THen go from there.

nvr-enough 06-28-2008 12:32 AM

so we got the new water pump and radiator in, and, well, it is still making the noise. At leas t the engine seems to run a little stronger :) but one of my sister's friends is a mechanic and says that it is possibly a bearing in the engine :confused: he says not to drive it :( but we are going to go try to get the noise to go away by putting in premium. Beyond that idk. Someone sayed that they work pretty close to me and could listen to it to try and figure it out, i think it was Dave? i'll keep you updated

nvr-enough 06-30-2008 10:27 PM

so, we think we have final pin pointed the problem. idk about the 4.0 liter but on the 4.2 liter there are 2 pulleys attached to the crank. The front pulley is fine and the belt goes from it, to the water pump, to the A/C. The second pulley behind the first is very wobbly and goes to the water pump and power steering...which has be a problem lately too...to we aren't even going to try to fix this on our own and its going in for an estimate tomorrow:(

mike94wrangler 07-20-2008 01:06 AM

over fill the oil by a little, that should smooth out a slight knock. or use one quart of heavier wieght oil. also check spark plug cables, make sure they arent arching. mine were/ still are. haha reminds me i have to go buy some zip ties or clips for those.

nvr-enough 07-20-2008 01:10 AM

well, a few days ago we figured out that the noises were the pulleys, so we took them off and found out that the vibration dampener was missing. All it was is a rubber seal, so we replaced it with weather stripping and now it works fine:D


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