Will a 4.0 flywheel fit a 2.4 engine?

[BradB]

Newbie, so please bear with me.
Changing clutch pack on a 2003 Tj with a 2.4L engine. Flywheel does not look to bad, but if flywheel was not expensive, was going to replace it while in there. Searched for flywheels and found some dual mass for 4.0L in the $150 range but everything that pulls up for a 2.4L are like $600+. What is the difference, both are dual mass.
Will a 4.0L fit a 2.4L?

 

[Jerry Bransford]

Unless your flywheel has physical damage to its surface it's a waste of money to replace it. Replacing the flywheel is not a normal or usual part of replacing clutch. At the most it sometimes has a bit of glazing on its surface that is easily removed with emory cloth or a mild grade of sandpaper.

 

[BradB]

Unless your flywheel has physical damage to its surface it's a waste of money to replace it. Replacing the flywheel is not a normal or usual part of replacing clutch. At the most it sometimes has a bit of glazing on its surface that is easily removed with emory cloth or a mild grade of sandpaper.

Thanks. Gonna pull everything this weekend and see. Jeep still driveable, can just tell it is starting to slip. So hope it is still good.
Any reason why the 4.0 are so much cheaper?

 

[Jeffseven777]

Long story short. 4.0 cheaper cause millions were made. Don't get crazy swapping diff flywheels they are sometimes spec for specific crankshafts or specific clutch plate clearance. If you see deep scratches or very smooth areas get out that scotch pad/emery/fine sand paper and scuff it up. nothing crazy but give some texture for it to grip better. Scuff in circles. but clean it really good with some acetone or high % alcohol or even brake cleaner something that will evap off. wipe it really good any oil or grease can ruin your grip.

Lay it on a very flat surface and latterly take a small level and go along all over the surface see if you can find any uneven wear. This is as good as it gets if your doing it in your garage and don't have say a dial gauge. Also if you cant use a 4.0 and you feel yours is not good anymore call some machine shops ask if they can inspect the surface to see if its flat they will have the needed inspection tools not a dinky autoplace but a legit machine shop.

 

[BradB]

Long story short. 4.0 cheaper cause millions were made. Don't get crazy swapping diff flywheels they are sometimes spec for specific crankshafts or specific clutch plate clearance. If you see deep scratches or very smooth areas get out that scotch pad/emery/fine sand paper and scuff it up. nothing crazy but give some texture for it to grip better. Scuff in circles. but clean it really good with some acetone or high % alcohol or even brake cleaner something that will evap off. wipe it really good any oil or grease can ruin your grip.

Lay it on a very flat surface and latterly take a small level and go along all over the surface see if you can find any uneven wear. This is as good as it gets if your doing it in your garage and don't have say a dial gauge. Also if you cant use a 4.0 and you feel yours is not good anymore call some machine shops ask if they can inspect the surface to see if its flat they will have the needed inspection tools not a dinky autoplace but a legit machine shop.

Thank you!! That is very helpful!! So if mine is bad, is it possible to use at 4.0 flywheel on a 2.4? Or not? $100 for 4.0L , $600 for 2.4L.

 

[Jeffseven777]

If yours is bad and cant be flipped then just google some specs on the two fly wheels if they are exact. WHICH THEY SHOULDNT. then get the cheaper one. If you cant find specs then buy the cheaper with a return policy and compare they will need to be pretty close in all spec or it can get dicey. if the 4.0 is alot heavier it will mess with response in the RPS. heavier plate spinning is harder for a smaller engine. but deff just ask a shot to check its level and google the specs.

 

[Lou]

4.0 uses a single mass flywheel, the 2.4 is a dual mass. That is why the price is different.

 

[Jeffseven777]

The 2.4 shows 8 bolt hole pattern 4.0 shows 6 bolt pattern. id say get a 2.4 and call it a day if it doesnt pass an inspection here is some cheaper options on Rockauto

 

[TurboTJ]

Lay it on a very flat surface and latterly take a small level and go along all over the surface see if you can find any uneven wear. This is as good as it gets if your doing it in your garage and don't have say a dial gauge. Also if you cant use a 4.0 and you feel yours is not good anymore call some machine shops ask if they can inspect the surface to see if its flat they will have the needed inspection tools not a dinky autoplace but a legit machine shop.

The 4.0 flywheel is not flat by design.

 

[Jeffseven777]

The 4.0 flywheel is not flat by design.

More reason to get the 2.4 u need.

 

[Lou]

They are not interchangeable...

 

[Jerry Bransford]

Long story short. 4.0 cheaper cause millions were made. Don't get crazy swapping diff flywheels they are sometimes spec for specific crankshafts or specific clutch plate clearance. If you see deep scratches or very smooth areas get out that scotch pad/emery/fine sand paper and scuff it up. nothing crazy but give some texture for it to grip better. Scuff in circles. but clean it really good with some acetone or high % alcohol or even brake cleaner something that will evap off. wipe it really good any oil or grease can ruin your grip.

Lay it on a very flat surface and latterly take a small level and go along all over the surface see if you can find any uneven wear. This is as good as it gets if your doing it in your garage and don't have say a dial gauge. Also if you cant use a 4.0 and you feel yours is not good anymore call some machine shops ask if they can inspect the surface to see if its flat they will have the needed inspection tools not a dinky autoplace but a legit machine shop.

Nice stuff though understand the 2.5, 4.0, and 2.4 flywheels are not flat, they have a slight convex (dome) shape to the engagement surface. Most machine shops don't know about the convex shape and will cluelessly grind it flat which makes the clutch engage less smoothly.

Also, the 2.4's flywheel has a different dual-mass design that makes it not interchangeable with the 4.0's.

 

[BradB]

4.0 uses a single mass flywheel, the 2.4 is a dual mass. That is why the price is different.

Got it, but see dual mass 4.0L flywheels from $200 compared to the $600-$800 for the 2.4L I was totally confused.
Thanks for everyones help!!!

 

[BradB]

Nice stuff though understand the 2.5, 4.0, and 2.4 flywheels are not flat, they have a slight convex (dome) shape to the engagement surface. Most machine shops don't know about the convex shape and will cluelessly grind it flat which makes the clutch engage less smoothly.

Also, the 2.4's flywheel has a different dual-mass design that makes it not interchangeable with the 4.0's.

Thanks!! Understand bit still sucks. Lol!!