twack
Full Access Member
while waiting to pick someone up last night i noticed a slight noise.......the jeep is making a knocking noise at about 2k. not happy about this.
Uh Oh! it finally happened
- Thread starter twack
- Start date
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twack
Full Access Member
Lol
170k miles
Its had a good life, its seen all kinds of conditions in its life. Ive maintained it very well. But i dont baby the jeep.
HAHA i wasnt sitting there at 2k i noticed it pulling in and i reved it a couple times once i parked to confirm the noise.
Well, if you noticed it before 2k rpm, then it's not specifically happening at that rpm, and is consistent.
I wouldn't assume that it's got a knock just yet...
For example, I just finished building a liberty that had a "knock" around 2000 RPM. determined that it was up front. Removed serpentine, restarted, no funny noises. reconnected after feeling out if anything was noticeably loose, looked for what wasn't right.
Figured out it was the serpentine belt tensioner...the spring had lost tension and was shaking back and forth under load. Replaced, all good to go.
I wouldn't assume that it's got a knock just yet...
For example, I just finished building a liberty that had a "knock" around 2000 RPM. determined that it was up front. Removed serpentine, restarted, no funny noises. reconnected after feeling out if anything was noticeably loose, looked for what wasn't right.
Figured out it was the serpentine belt tensioner...the spring had lost tension and was shaking back and forth under load. Replaced, all good to go.
1BADKJ
Full Access Member
I second that. Had that problem
twack
Full Access Member
Its definitely coming from inside the motor and not the pulleys and belt. My brother came over tonight and we poked around for awhile and he swears it sounds like a rocker popped off. so i think im going to pull the valve covers and see what i got.
Pull the serpentine off and run it. Let me know if it still knocks. And which side. Is it stumbling at all? Or just knocking? If it's a knock and runs fine, it's in the bottom end. Knock and runs like crap, probably a dropped valve seat. If it's a tick and ruins fine, lifters or rollers on the rockers. Tick and runs like crap, dropped valve seat and or purely bad rocker
TwoBobsKJ
Full Access Member
I had a tap that turned into a knock which turned into an engine swap. Just finished it this weekend.
Put a 3.7 from a 2007 Dodge Dakota into my '03. Found the donor motor at a local yard with only 9700 miles on it - runs like a top. Have put 600 miles on it since Sunday night (2 days of driving.)
I hoped and hoped that the sound I was hearing was something up top or in the front but as JeepCoMJ said it ran fine so I knew it was a bottom end problem. Right at the end I was sure the rod was coming through the block - the Jeep scared people at traffic lights it was so loud.
The swap isn't hard but a few particulars will help anyone doing a swap avoid some mistakes.
I'll be doing a quick overview of my experience here in a few days.
Bob
Put a 3.7 from a 2007 Dodge Dakota into my '03. Found the donor motor at a local yard with only 9700 miles on it - runs like a top. Have put 600 miles on it since Sunday night (2 days of driving.)
I hoped and hoped that the sound I was hearing was something up top or in the front but as JeepCoMJ said it ran fine so I knew it was a bottom end problem. Right at the end I was sure the rod was coming through the block - the Jeep scared people at traffic lights it was so loud.
The swap isn't hard but a few particulars will help anyone doing a swap avoid some mistakes.
I'll be doing a quick overview of my experience here in a few days.
Bob
Didn't you have to swap the timing sets out in order to do the swap>
twack
Full Access Member
it pretty much runs like normal, sometimes when it warms up it even takes a minute or two for the noise to start. I took off the valve covers and everything looks good in there. so sadly i think this might be the end of the road for my jeep unless JeepCoMJ you want to sell me that spare motor for dirt cheap
TwoBobsKJ
Full Access Member
I found a shop in Michigan that sells the right side cam sprocket and the crankshaft reluctor ring as well as a blocking plate for the EGR valve. Saves having to break down the old motor to pull timing sprockets out only to then put them in the new engine.
I didn't want to tear down two engines just to swap those parts so the kit was worth it for me - cost $200 from Engine-Guru.com.
Bob
I unfortunately don't have a spare motor right now. Used my last one on the blue KJ. Looking at another KJ with seized motor tomorrow, so I will be on the lookout for a motor sooner than later...
Did you take the serpentine off as I asked? It's really such a simple task (15mm wrench), that it's worth doing on the off chance that it's in the serpentine assembly.
You have to remember that aluminum heads resonate sound better, and the front cover is aluminum and will transfer noise straight up and across the entire engine.
twack
Full Access Member
tomorrow ill put the valve covers back on and try it without the belt on and see what happens.
Krashdragon
New Member
Question... my 2002 has a ticky at warm idle, put it neutral and rev up about 1200 rpm and it goes away. So this is the beginning of the end?
i was told to now run heavier oil was always mobile1, and dont tow anything.
also to either put in neutral with a little gas or shut it off at long stops.
Major problem, since i'm running out to LA from DFW next month, then moving to Ohio from Ft Worth and have to tow my bike. only 180000 miles, but lots more idling sitting in traffic jams in Hawaii. Guess i'll cross my fingers. y'all drive safe.
mary aka krashdragon
sorry, typing on phone *****...
i was told to now run heavier oil was always mobile1, and dont tow anything.
also to either put in neutral with a little gas or shut it off at long stops.
Major problem, since i'm running out to LA from DFW next month, then moving to Ohio from Ft Worth and have to tow my bike. only 180000 miles, but lots more idling sitting in traffic jams in Hawaii. Guess i'll cross my fingers. y'all drive safe.
mary aka krashdragon
sorry, typing on phone *****...
twack
Full Access Member
ill update this. i pulled the pan and the oil filter........i struck gold!!!!!! so much flakes in the oil. bearing ate itself. something happened and it consumed a bunch of oil then it ate a bearing. so i had to source out a motor
