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Unread 05-26-2011, 02:34 PM   #1
skysthelimit001
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1987 YJ Wrangler 
 
Join Date: Apr 2011
Location: sound beach, new york
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help, deep in the motor, the wallet, and still not in the mud

3 months ago i bought an 87 wrangler yj...i've been working on it ever since...after a few days i replaced some gaskets and the exhaust and noticed that the motor had a knock from the lower half....since then, i've bored out the block and installed every part brand new or reconditioned including: crankshaft, main and rod bearings, pistons, freeze plugs, camshaft and cam bearings, full gasket kit, harmonic balance, oil pump, etc....i fired her up late last night and there is still a knock about the same as it was before the rebuild slightly higher pitch....i'm so frustrated with it this jeep is fighting so hard i'm at a loss for what to do next...please any ideas would help

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Unread 05-26-2011, 02:44 PM   #2
bec
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1993 YJ Wrangler 
 
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new oil filter?did you run it with the drivebelt off?automatic transmission or manual transmission? could be a flywheel.just some suggestions if the motor was properly built
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Unread 05-26-2011, 02:51 PM   #3
MONSooNmonkey
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New oil pump, it is mechanical no?
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Unread 05-26-2011, 02:52 PM   #4
MJMPC
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Check your oil pan for dents. It dont takr much of a dent to hit the crank an sound like a rod going out.
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Unread 05-26-2011, 03:02 PM   #5
bec
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i said oil filter if you did not change it and it was plugged up
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Unread 05-26-2011, 05:40 PM   #6
skysthelimit001
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brand new oil filter...its a manual tranny....no visible dents in the oil pan but i had someone helping me and he felt a knock vibration when he put his hand on the oil pan....the only thing i can think of is that something wasnt right w the crankshaft and main bearings, when i put it in the motor was on a stand and it was hard to turn it over by hand once i got it started it spun ok but not as easily as i would have liked....i should have used a feeler gauge but the napa auto parts called their machine shop and they swear the bearings match the cut on the crank...?????
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Unread 05-26-2011, 09:53 PM   #7
bec
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Sorry for the news,I would sure make napa responsible if indeed they gave you the wrong bearings.you don't think it is possibility a rod cap is turned backwards or cap is on wrong rod?first engine I built I completed block and turn crankshaft over and the crank got tight.pulled rod caps and found out that I had two caps in wrong location.switch em back and turned like a champ .that I what I got for not clearly marking the rod and caps.engine had been built before because there were several rods marked the same no.lesson well learned for me.
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Unread 05-26-2011, 11:26 PM   #8
MJMPC
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Quote:
Originally Posted by skysthelimit001 View Post
brand new oil filter...its a manual tranny....no visible dents in the oil pan but i had someone helping me and he felt a knock vibration when he put his hand on the oil pan....the only thing i can think of is that something wasnt right w the crankshaft and main bearings, when i put it in the motor was on a stand and it was hard to turn it over by hand once i got it started it spun ok but not as easily as i would have liked....i should have used a feeler gauge but the napa auto parts called their machine shop and they swear the bearings match the cut on the crank...?????
It doesnt take much of a dent to makt it knock. If the old motor knocked and this one does also almost have too be the same thing wrong with both.
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Unread 05-27-2011, 12:25 AM   #9
GOWAD
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your not the only one my motor is doing the same thing ........ we took it a part 3 times still same knock
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Unread 05-27-2011, 02:58 AM   #10
bec
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Now that my memory is coming back I do remember a bulletin.was the pistons you installed black coated?if not clearance issues need to be addressed.this was with a piston knock at idle.
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Unread 05-27-2011, 03:55 AM   #11
bec
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I'm sorry I believe that bulletin was on 93 or later.
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Unread 05-28-2011, 07:25 PM   #12
skysthelimit001
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i figured it out after another late night wrenchin it was a dent in the oil pan that looked so uniform and factory i thought it was supposed to b like that, i also forgot to put in a new crank pilot bearing....thanks for all the advice.....

i have a new set of issues now, im on my second set of new freeze plugs and their still leaking, i tried permatex gasket maker, next im gonna loosen the radiator cap and run the motor under lower pressure and c if the heat will help them seal....this yj is putting up quite a fight but i'll make her run smooth in the end weather she likes it or not!!
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Unread 05-29-2011, 12:44 PM   #13
laybackman
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Quote:
Originally Posted by skysthelimit001 View Post
i figured it out after another late night wrenchin it was a dent in the oil pan that looked so uniform and factory i thought it was supposed to b like that, i also forgot to put in a new crank pilot bearing....thanks for all the advice.....

i have a new set of issues now, im on my second set of new freeze plugs and their still leaking, i tried permatex gasket maker, next im gonna loosen the radiator cap and run the motor under lower pressure and c if the heat will help them seal....this yj is putting up quite a fight but i'll make her run smooth in the end weather she likes it or not!!
If you do not use or make a 'tool' to tap in the freeze plugs so they are in straight they will leak no matter how much goop you put on them. Use a proper sized socket or section of pipe to tap them in straight. They should have a bit of Permatex on them but not gobs of the stuff.
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help needed , knocking , rebuild kit , stroker motor

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