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Old 04-04-2006, 11:45 PM   #1 (permalink)
 
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Need help!

I'm not sure if this is the place to post this but, I have a 78 CJ-7 wit a 304. Yesterday while driving back from the local car wash, I started to get a loud knock, if I let off the gas and let it idle the knock wasn't to bad but if I gave it any gas at all it got louder in relation to the RPMs. I am pretty sure it's a rod knocking (I could be wrong)and I am on a budget (cause uncle sam pays so well). I can turn a wrench and am willing and want to learn to be able to fix anything on my Jeep, I just don't know what would need to be changed out in order to get it back on the road. I can't afford a crate engine or to have someone rebuild mine. I can follow directions and get things done as I rebuilt the TH400 using a Haynes manual and rebuilt the Dana 18 using an online write-up and both work great. Any help would be greatly appreciated.
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Old 04-05-2006, 09:49 AM   #2 (permalink)
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Please don't be insulted by this, but, check the oil. Knocks don't just come out of nowhere. Make sure it has enough, and you didn't get water into it at the car wash. A leaky seal the valve cover or the fill tube could allow water to get in and screw with it's ability to lubricate.

If it's truly rod knock, drop the pan and take a look at things. When you drain the oil to drop the pan, run a magnet through it and see what comes out. Rod bearings are fairly simple to replace with the motor still in the Jeep.

Last edited by butch6924; 04-05-2006 at 09:49 AM.
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Old 04-06-2006, 12:03 AM   #3 (permalink)
 
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I'm not insulted at all, I realize I have alot to learn. Thanks for replying! I'll pull the pan tomorrow and check it out.
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Old 04-06-2006, 08:04 AM   #4 (permalink)
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Pickup a pan gasket and some beers... Don't get in a hurry... I was rushing to fix my 258 and buggered the rear main seal when I reinstaleld the pan.
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Old 04-07-2006, 11:22 AM   #5 (permalink)
 
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thanks for the hint. I drained the oil and it looked good, no big chunks of metal or anything. I started to drop the pan when after taking of the inspection plate and the starter to get to some of the pan bolts I noticed one of my drive plate to torque converter bolts sticking way out. I recently rebuilt the trans and replaced the torque converter but I am positive i torqued the bolts down to spec. Are they supposed to have some sort of lock washer or something? When I rotated the drive plate to get to the loose bolt I found another bolt was loose also. The head on the bolt sticking out was mashed on one side so could that have been the knock I was hearing?
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Old 04-07-2006, 11:38 AM   #6 (permalink)
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Quote:
Originally Posted by im5811mp
thanks for the hint. I drained the oil and it looked good, no big chunks of metal or anything. I started to drop the pan when after taking of the inspection plate and the starter to get to some of the pan bolts I noticed one of my drive plate to torque converter bolts sticking way out. I recently rebuilt the trans and replaced the torque converter but I am positive i torqued the bolts down to spec. Are they supposed to have some sort of lock washer or something? When I rotated the drive plate to get to the loose bolt I found another bolt was loose also. The head on the bolt sticking out was mashed on one side so could that have been the knock I was hearing?

Try using Loctite on the bolts.
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