Calgary Jeep Association
4x4 Related Groups => Tech Talk => Topic started by: 4Play on January 18, 2007, 05:14:12 PM
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Well this week I was hunting a noise in the front of my jeep and replaced the clutch fan, water pump and timing chain and got her put back together; and it still makes the noise It is kind of a knocking, only after it heats up, and only at about 1800 RPM. I am thinking the motor has had it. Any ideas. Just replace it with a used one change all my good and new parts over? Would a 4.0 block work, put my manifold on, and keep the new holley on. Damn jeep runs perfect except that noise. Expensive to rebuild I am assuming. Just built a place in Airdrie and moving in Jan. 30 so a V-8 conversion is out for a few months till the garage is equipped with at least a bench and lights and some bills are payed.... Any thoughts or ideas. Thanks.
Mike
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Well this week I was hunting a noise in the front of my jeep and replaced the clutch fan, water pump and timing chain and got her put back together; and it still makes it. It is kind of a knocking, only after it heats up, and only at about 1800 RPM. I am thinking the motor has had it. Any ideas. Just replace it with a used one, and change all my good, new, parts over. Would a 4.0 block work, put my manifold on, and keep the new holley on. Damn jeep runs perfect except that noise. Expensive to rebuild I am assuming. Just built a place in Airdrie and moving in Jan. 30 so a V-8 conversion is out for a few months till the garage is equipped with at least a bench and lights. Any thoughts or ideas. Thanks.
Mike
The teeth on timing gear break. Have plastic teeth. When i stripped my engine down there was like 3 chunks of plastic missing and some others crack.
You may have checked it or not already.
Theres pics of the timing gear in the project section under 88YJ that i built. Then u can see.
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When I replaced the timing gears, the old gears were all intacked. Just a very stretched chain. The noise is usually gone on the highway, but when in the city it does sound bad (much like the rattle of a chain) passing 1700 RPM or so.
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actually the rebuild for the 4.2 is not as expensive as you would think. If you do it yourself and get rid of the labor. I did mine last winter. Firebolt has good deals on kits (i think they are called celtis now)
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actually the rebuild for the 4.2 is not as expensive as you would think. If you do it yourself and get rid of the labor. I did mine last winter. Firebolt has good deals on kits (i think they are called celtis now)
Couldn't find celtis in the phone book. Just called firebolt and for a rebuild, crank to cylinder head; $1750 + GST
And they don't sell rebuild kits.
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Thats not too bad of a price. Does that include machining?
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Thats not too bad of a price. Does that include machining?
I didn't even ask them. Cant afford near that right now...! I would rather do a V8 swap for that kinda money!
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Personally, if it has good oil psi, doesn't get hot, or make horendous noise, I would run 'er 'til she blows :) Everyone has a different opinion as to what is noisy. Have you done a compression test? Is it noisy under load/coasting...?
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Personally, if it has good oil psi, doesn't get hot, or make horendous noise, I would run 'er 'til she blows :) Everyone has a different opinion as to what is noisy. Have you done a compression test? Is it noisy under load/coasting...?
It is to loud to drive. No compression test. It is noisey under load. When coasting it pretty much goes away. Very loud when warmed up and at a certain idle. My mechanic just suggests throughing a used one in for the time being and replace all gaskets and put a header on. keep a $500 budget and rebuild mine on the side. Just seems weird that it still has power and I thought it was a well running strong truck, with a suddenly loud spot!!!!
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try something out in left field...run it without any belts on it (ps, etc.). In my years as a mechanic I've run into belt driven accessories that make an engine sound really bad. Just my two cents worth. also. does the noise change whether or not you step on the clutch? could be a bad thrust bearing on the crank.
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cracked manifold??
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Canadian-Ron
on this site has a good 4.2 engine in the "Jeep stuff for sale" section.
Just thought I'd let you know
Also ............... I made a mistake on the engine rebuild kit
I got it from ........... Canadian Hi-performance discount
they are in prince george..............Gaskets and bearings only costed me 221.90$
I got the pistons and rings from firebolt (and the machining)
All the smaller stuff ie. Water pump, gel battery, fuel pump from napa
And the motor craft 2100 carb from BOWNESS AUTO ( wicked guys!!!)
Autowreakers for the HEI ingition conversion ...see here http://www.4x4wire.com/jeep/tech/electrical/hei02/
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Canadian-Ron
on this site has a good 4.2 engine in the "Jeep stuff for sale" section.
Just thought I'd let you know
Also ............... I made a mistake on the engine rebuild kit
I got it from ........... Canadian Hi-performance discount
they are in prince george..............Gaskets and bearings only costed me 221.90$
I got the pistons and rings from firebolt (and the machining)
All the smaller stuff ie. Water pump, gel battery, fuel pump from napa
And the motor craft 2100 carb from BOWNESS AUTO ( wicked guys!!!)
Autowreakers for the HEI ingition conversion ...see here http://www.4x4wire.com/jeep/tech/electrical/hei02/
What do you think you spent on the entire rebuid doing it yourself? And as far as CanadianRon, I have already PM'ed him!
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I think with all the extras i spent about 800$-900$ including the 75$ core for the 4.2
Ohh yeah the timing chain and gears were from firebolt as well
.............. i had a 4 cyl in my CJ before
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bad cam button??