Quick Answer

Frequent Question Where do 0331 heads crack?

Most “0331” heads are cracking on the valve spring side (which won’t cause a miss). If it’s between an exhaust port and the water jacket, you’ll have steam coming from the exhaust but the engine will run fine.

How do you tell if I have a 0331 head?

To find out which 0331 you have, shine a light down in the oil filler cap and look at the surface of the head between the #3 and #4 cylinders. Below is a pic another member here posted a while back of an original 0331 on the left, and a Clearwater 0331 on the right.

Are all Jeep 4.0 heads the same?

Not so! The heads will swap mechanically, so they’ll bolt right up to the block (the 258 and 242ci heads, 1975 and later, use the same screw pattern and can use much the same gasket.) Yes, the 0331 head (1999-2006) will have the coil rail bosses that the previous heads will not.

Where is the casting number on a jeep 4.0 HEAD?

It’s on the driver’s side. Use a GOOD light to help you read it! Above &amp
between the #3 &amp
#4 exhaust ports, outside the valve cover rail. It’s a four-digit number.

How much does a jeep 4.0 head weigh?

The block, clean and stripped, weighs 138 pounds. The head without valves, springs or rockers weighs 65 pound. The crank weighs 57 pounds.

What Jeeps have the 4.0 inline 6?

The following years and Jeep models have 4.0L straight-6 engines:

  • 1987-2001 Jeep Cherokee.
  • 1993-2004 Jeep Grand Cherokee.
  • 1987-1990 Jeep Wagoneer.
  • 1987-1992 Jeep Comanche.
  • 1991-2006 Jeep Wrangler.

What years did the Jeep Wrangler have the 4.0 engine?

However, one thing all of us can agree on is the fact that the Jeep 4.0 engine is downright legendary. The 4.0 liter Jeep engine was used in Jeeps from 1987 to 2006 and it’ll never be gone from our hearts. However, the origins of the Jeep inline 6 date back even further.

How do I know if I have a 4.0 Jeep engine?

4.0L Engine Date Codes

  1. 1st Digit-The year (8 = 1998).
  2. 2nd & 3rd Digits-The month (01 – 12).
  3. 4th & 5th Digits-The engine type/fuel system/compression ratio (MX = A 4.0 Liter (242 CID) 8.7:1 compression ratio engine with a multi-point fuel injection system).
  4. 6th & 7th Digits-The day of engine build (01 – 31).

How can I tell what year my Jeep engine is?

Engine date code. The date code is on the passenger side of the engine, on the block, just forward and up from the distributor on a machined flat surface. The digits of the code identify: 1st Digit-The year (8 = 1998).

How do I know what engine is in my Jeep?

Examine the right side (driver’s side) of the engine below the distributor and above the oil pan. The casting numbers are typically found on top of the engine head in the right front corner.

How much horsepower does a 4.0 inline 6 have?

4.0 Straight-Six Engine Specs

Engine AMC/Jeep/Chrysler 4.0
Valvetrain OHV
Bore x Stroke 98.4mm x 86.7mm
Compression 8.8 : 1 to 9.2 : 1
Power 173-190 HP

What does a 350 engine weigh?

There is about 540 to 560 pounds in the old 350, whereas 445 pounds were added.

How heavy is a 2Jz engine?

How Much Does A 2Jz Short Block Weight? The stock 2jzge weighs roughly 475 pounds when it comes to w/speakers, and its biggest weight is 650 pounds when it comes to w/o transmissions as opposed to the stock 2jzge which weighs approximately 500 pounds.

Why is the Jeep 4.0 so good?

The Jeep 4.0 liter six-cylinder engine provided good acceleration from low speeds in Jeep Wranglers and Cherokees for years, with high torque at low engine speeds. It was used in other vehicles (such as the Grand Cherokee) as well, a strong, durable performer loved by its owners.

How long will Jeep 4.0 last?

According to the manufacturer, the Jeep 4. It is generally possible for an 0 engine to last approximately 200k miles and some even make it 300-400k without a single problem. Longevity and reliability are two good things to consider.

What year jeeps should you stay away from?

It needs to be emphasized that the 2007-2008 and 2012-2014 model year Wranglers should be avoided at all costs. This is due to their hefty repair costs, poorly designed interior, and underpowered engine.

Is the Jeep 4.0 reliable?

Jeep 4.0 engines are well received and appreciated by the market because they are reliable, provide a good amount of torque, and are simple.

Is the Jeep 4.0 fuel injected?

Ta-da, a 242ci 4.0L six-cylinder arrives in the Cherokee and Comanche. The 177hp and 224lb-ft of torque inline-six has a multiport fuel injection and a high-flow cylinder head, plus a larger bore and shorter stroke than the 4.2L (3.88×3.

How can I tell what year my XJ is?

The VIN is comprised of 17 alphanumeric characters. Locate the tenth character of the VIN, counting from left to right. This character will tell you the year of the Jeep (this only applies to Jeeps built after the 1970s).

How do you know if your Jeep is a JK or JL?

JK Wranglers have a button that you must push in order to open the door or rear gate. The tail lights on the JL Wrangler have a very distinct, non-rectangular shape with a reverse light in the middle. JK’s have a square tail light with a reverse light at the bottom.

How can I tell if my Jeep is a JK or JL?

When examining the front of your Wrangler, pay attention to the placement of its headlights. JL headlights encroach on the grille vents, but the JK headlights do not. The JL also features front-facing indicator lights on the fender flares.

Is my Jeep a JK or JL?

On the JK edition, that grille is smooth from top to bottom and has a narrow space between each grille opening. It also has the Jeep logo in chrome, right above the grille openings. On the newer JL Wranglers, the grille has a ‘kink’ in the middle as the grille face goes slightly out and then back from top to bottom.