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Old 07-10-2011, 11:21 PM   #1
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Knock, knock.........

Hello,
New to the forum. Helping my son fix up his 88yj with a 4.2. We have done a few things to it......webber and HEI. The jy was running awesome after these upgrades. Here's my problem. Oil pan was leaking from a small hole in the pan. No problem....ordered an new pan and proceeded to install it today. Well, it wasn't what I call a great fitting pan. Replaced filter and oil, fired her up and got this knocking sound coming from th oil pan. It's loud and increases with rpm. It did not do this prior to changing the pan. Could the pan be that I'll fitting or cheap that it doesn't clearance the rotating assembly?
Could I have torqued the oil pan bolts to much? Damaged, the rear main seal.....don't know if that would cause a knock, thou.
I'm a chevy guy by nature, but excited about wrenching on the is jeep with my son. Any help would definetly be welcomed.
Thanks

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Old 07-11-2011, 05:30 AM   #2
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Sounds like the crank is hitting the oil pan. Did they give you the wrong one?

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Old 07-11-2011, 06:40 AM   #3
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Quote:
Originally Posted by RLaFitte
Sounds like the crank is hitting the oil pan. Did they give you the wrong one?
Yea I also think you might have gotten the wrong one
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Old 07-11-2011, 07:21 AM   #4
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I don't know if they gave me the wrong one, I'll have to check that out. It appears to be the right pan, it bolted up ok, except at the very front by the timing chain. I had to do a little persuading with a wood block and a hammer. Not enough to dent the pan, though.
But, I agree with you both that the crank is hitting the pan. I will check the application and see if there is any way i could have gotten the wrong pan. I think I need to ditch the cheap afermarket replacement pan and look for a stock pan at the boneyard.
Thanks for the input, guys. I really do appreciate it.
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Old 07-11-2011, 07:34 AM   #5
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Goodluck let us know what you find out.
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Old 07-11-2011, 07:42 AM   #6
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Yes, good luck and keep us posted on how it goes!
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Old 07-11-2011, 12:04 PM   #7
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hey guys, i have the same problem now... but i didnt change my pan, i only changed the gasket, but after i changed it i started getting more of a "ticking" noise that gets faster as the rpm goes higher. I didnt damage the pan, but i had a bunch of bolt issues, nothing that could have caused the crank to hit the pan. I was about to post my question when i saw this, but ive been told it might be from a dirty oil lifter?? do you guys think that might be possible?
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Old 07-11-2011, 12:10 PM   #8
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I have actually seen two oil pan gaskets used on a single application. What it does is space the oilpan a little bit more, and sometimes keeping it from hitting. Now I don't know whether this is a good idea but sometimes it WORKS. What say you guys?
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Old 07-11-2011, 12:14 PM   #9
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I was origionally planning on trying that, but I did a bunch of research and said it cuts the life span of the gasket in half. So instead, i used 2 full tubes of the sealant which in reality it did space it out a bit more than just the gasket.... just my .02
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Old 07-11-2011, 12:24 PM   #10
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Originally Posted by GKjeep View Post
I was origionally planning on trying that, but I did a bunch of research and said it cuts the life span of the gasket in half. So instead, i used 2 full tubes of the sealant which in reality it did space it out a bit more than just the gasket.... just my .02
Did you use high-temp gasket sealant or what? HaHa, inquiring minds want to know!
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Old 07-11-2011, 12:41 PM   #11
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i didnt =/ i had baught the regular one before i heard about the RTV ones, but its been a few days now, and i had 2 broken bolts that i retapped and didnt torque to its limit, but it seems fine so far (i hope i dont jynx it) lol ...

on a random note
I love this forum... I for my jeep in April of this year, I knew absolutily NOTHING about cars... (i didnt even know how to change oil lol) Now ive learned soo much.. i did the oil pan, changed the entire front end.. axles shocks leafs etc... bedlined by tub, installed and wired lighting, removed and re-installed my entire dash... anyway, i did this all only thanks to WF!
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Old 07-11-2011, 01:12 PM   #12
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If you turn it on and put your hand up against the pan can you actually feel it hitting the pan or you can't tell?I'm thinking maybe it had thick oil and now what you put in isn't thick enough to mask the sound.
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Old 07-11-2011, 09:08 PM   #13
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Well, I took off the new pan and sure as heck, the crank was hitting the pan on the drivers side. All 6 were hitting. Compared the new pan to old and found that the new pan did not have the same clearancing indentations on the side that the original pan had......a real pos......off to the boneyard to find a usable OEM pan. Wish I would have noticed that before I installed it. Thanks for everyone's help!!

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