Motor Recommendations - JeepForum.com
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post #1 of 27 Old 08-02-2020, 12:37 PM Thread Starter
djt101274
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Motor Recommendations

Well I think I blew the head gasket on my 258 i6. I have the funds and I'm ready to put a new motor in it. I was burping my coolant system after the new thermostat was put in with my no spill funnel and it turned into a volcano!!

Can anyone recommend a good crate motor? I think I want to stick with the 258 add an electric fan and shroud and a new water pump.

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post #2 of 27 Old 08-02-2020, 12:49 PM
oldschool74cj5
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hello

how many miles on the orig engine? was it running strong before the headgasket blew? the reason im asking is if it was running good why not just change the head gasket and maybe even reseal the motor?

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post #3 of 27 Old 08-02-2020, 01:48 PM
bob4703
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Before you go crazy buying a replacement engine check two things. Did you perhaps put the thermostat in backwards? My son's favorite free mechanic did that to his truck. Boy was I embarrassed! Make sure your radiator isn't clogged up. Fixing either is cheaper than buying an engine.

Good luck and cool running!

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post #4 of 27 Old 08-02-2020, 03:09 PM Thread Starter
djt101274
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Thanks. It was running strong. The previous owner rebuilt the engine about 60,000 miles since it was rebuilt. ODOM reads 153,000.

Fixing it is probably a better idea but there is a draw to going OEM new for me.
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post #5 of 27 Old 08-02-2020, 05:51 PM
adman02
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do a 4.0 swap.
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post #6 of 27 Old 08-02-2020, 06:20 PM
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Ditto on checking thermostat. You may have just become your own victim.

If you do not need a very fast amount of heat from your heater, I would suggest you drill a 1/4" hole in the top edge of the thermostat, it will allow a small amount of hot water to circulate which will give you better thermostat opening and release any air trapped.

As to new engines, yes a crate rebuild of the 258 will keep it original and be the easiest to install. If you go 4.0 you will want the fuel injection, so there is a lot more to do. the 4.0 has slightly more torque but it carries on to higher rpm so you get more horsepower higher up, great on the highway but unneccessary off road.

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post #7 of 27 Old 08-07-2020, 07:10 PM Thread Starter
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I'm going to replace the head gasket add an electric fan which it desperately needs and I am close to deciding on getting rid of my Holly carb and add fuel injection.
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post #8 of 27 Old 08-07-2020, 07:31 PM
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another head gasket here


https://www.jeepforum.com/forum/f8/2...-time-4077458/

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post #9 of 27 Old 08-07-2020, 09:55 PM
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Motor Recommendations

Donít listen to any of these people! You will need to swap out the 258 and drop in a 401. Probably have the T4/5 in it now so youíll need a beefier transmission and the mounting brackets from Novak to mate it all up to your Dana300.

That amount of torque might be too much for the axles so better swap those as well. Now that you have beefier axles you might as well go up to at least 37Ē tires.

Of course youíll need to something about that suspension and lift to fit the 37ís.

Those 401ís are notorious for running warm so youíll want to invest in a robust radiator/cooling system.

You canít afford NOT to! Good luck and whatever you do DONíT stop spending money!


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I want my two dollars!
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post #10 of 27 Old 08-07-2020, 10:39 PM
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^^^^^^

But heck, go for the LS7 and wider tyres for the wheel spin

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post #11 of 27 Old 08-08-2020, 12:17 AM
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And what makes you think you blew a head gasket? Did it get really freaking hot at some point? Is it blowing white smoke out the exhaust? Reason i ask is this is, if your gasket is blown and the piston is pushing air into the coolant passages. It is also sucking coolant and burning it out the exhaust. If so, just replacing the head gasket is probly not the answer. You need to see if you warped the head(if it got really freaking hot). Put a level on it or take it to a machine shop. With 60.000 on a rebuilt motor and you have the head off of it, it would be best to #1 have it rebuilt, or #2 put a reman head on it. Basically with a rebuilt head you are extending the life of that motor by a lot.

What was the reason for the thermostat replacement? Is the thermostat you just put in working properly? Could very well be stuck shut. You can put it in boiling water and see if it opens or replace with another one. The reason i ask this is, a clogged water passage will create a volcano effect in your radiator. The water pump is creating pressure and that pressure has to go somewhere. The easiest place for it to go is through the open radiator cap. Are you actually getting air out thru the funnel or is it just pushing fluid up thru it and makes it look like air. Thing is a blown head gasket is gonna be a steady burp of air, burp burp burp burp, while a clogged water passage is gonna be a suck suck suck big burp, suck suck suck big burp..... If ya get what i'm saying..
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post #12 of 27 Old 08-08-2020, 04:47 AM
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I am also not convinced the head gasket is bad. How were you purging the air out of the system? Perhaps the engine was already getting hot , there was an air pocket or more?

Reread the first post so you were using a funnel that attaches to the radiator? As the air burps out it will bubble and splash if the funnel is full.
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post #13 of 27 Old 08-08-2020, 09:03 AM
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The last thing you did to your Jeep before you started having problems was to change the thermostat. Before changing a head gasket check your thermostat. Anytime you start having problems after doing something always check if your last work is done right.

Wise old mechanic once said "If it ain't broke don't fix it!"

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post #14 of 27 Old 08-08-2020, 10:51 AM Thread Starter
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When I burped my system I had a volcano come through the no spill funnel consistently for 5 minutes boiling over The thermostat was bad and we replaced it. funny is no smoke out of the pipe I dont see oil in the radiator and the engine oil looks fine. I think Im getting combustion in the radiator
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post #15 of 27 Old 08-08-2020, 11:01 AM
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Quote:
Originally Posted by djt101274 View Post
. I think Im getting combustion in the radiator
There is a test kit for that. Combustion leak detector. I did it a few years ago. I think I was able to rent the tool for free from AutoZone or somewhere like that, but just had to buy the fluid that it uses.
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