P0303 code

[TexasMojitoRubi]

and sadly i'm pretty sure i'm going to just sell it once its up and running. major engine issue at such low mileage is a bad combo

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[roaniecowpony]

Doesn't look like any o-rings are sold separately for the power steering lines.

McMaster Carr

 

[roaniecowpony]

and sadly i'm pretty sure i'm going to just sell it once its up and running. major engine issue at such low mileage is a bad combo

I understand your decision to sell it. I weighed that decision myself. However, I had just lifted it, 37s and all kinds of other mods amounting to $20k the year before. I wasn't done getting the fun out of it. So, I decided I'd do whatever I could to keep the new engine healthy. I went to higher quality and higher viscosity oil (for the cams) and premium gas to stay out of detonation which could be a cause or contributor to the head gasket problems. Keep in mind, these are 11.3:1 compression engines. A little more for gas is cheap insurance for a head gasket, IMO.

I had the same thing happen last year on my 2018 3.6 with 34,453 miles. Way out of warranty. I elected to find a new engine. I found a new engine from a 2024 JT with 160 miles. That got me a larger alternator and some spares like starter, ac compressor, hoses, and accessories. Now have a good parts collection for problems.

Currently helping to replace a member's engine that puked a cylinder and flattened a cam, at 110k. Since it had a lot of miles, we're going with a new engine as well. There's a lot of people that have had these issues.

While you're in there, replace the Oil Filter Housing with a new part number 68596318AB . You can read about it here 2014-2018 JK Oil Cooler Housing Mega Thread | Page 165 | Jeep Wrangler Forum

2014-2018 JK Oil Cooler Housing Mega Thread | Page 171 | Jeep Wrangler Forum

 

[TexasMojitoRubi]

I understand your decision to sell it. I weighed that decision myself. However, I had just lifted it, 37s and all kinds of other mods amounting to $20k the year before. I wasn't done getting the fun out of it. So, I decided I'd do whatever I could to keep the new engine healthy. I went to higher quality and higher viscosity oil (for the cams) and premium gas to stay out of detonation which could be a cause or contributor to the head gasket problems. Keep in mind, these are 11.3:1 compression engines. A little more for gas is cheap insurance for a head gasket, IMO.

I had the same thing happen last year on my 2018 3.6 with 34,453 miles. Way out of warranty. I elected to find a new engine. I found a new engine from a 2024 JT with 160 miles. That got me a larger alternator and some spares like starter, ac compressor, hoses, and accessories. Now have a good parts collection for problems.

Currently helping to replace a member's engine that puked a cylinder and flattened a cam, at 110k. Since it had a lot of miles, we're going with a new engine as well. There's a lot of people that have had these issues.

While you're in there, replace the Oil Filter Housing with a new part number 68596318AB . You can read about it here 2014-2018 JK Oil Cooler Housing Mega Thread | Page 165 | Jeep Wrangler Forum

2014-2018 JK Oil Cooler Housing Mega Thread | Page 171 | Jeep Wrangler Forum

It’s an excuse to buy a 2 door. I will never be out.

 

[TexasMojitoRubi]

Rebuild has started. Freshened up heads are reattached. waiting on a few parts before I can really get going.

 

[TexasMojitoRubi]

Parts acquired. Race to the finish line this week (hopefully). I will video the moment of truth. Ideally the jeep doesnt explode.

 

[TexasMojitoRubi]

It’s built up enough to start. Headed to get some oil and coolant and then blast off

 

[HHGadget]

It’s built up enough to start. Headed to get some oil and coolant and then blast off

Looking good!

 

[TexasMojitoRubi]

0 spare parts. Most importantly.

 

[TexasMojitoRubi]

Fucking battery is dead. Moment of truth tomorrow

 

[HHGadget]

It’s built up enough to start. Headed to get some oil and coolant and then blast off

Did the heads end up being true?
Your pictured gasket looked much better than mine.

 

[HHGadget]

 

[58Willys]

Fucking battery is dead. Moment of truth tomorrow

I’ve had that happen numerous times after a rebuild. At least no spare parts!

Did you have to completely remove exhaust manifold/cat, or were you able to just unbolt and slip head off?

 

[roaniecowpony]

To me, the machined slot between the cylinders looks like it wasn't part of the original design, but rather a fix to an issue. Otherwise there would be more surface area there.

 

[TexasMojitoRubi]

Sounds like a wrangler.

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