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Jeep MJ Comanche 4.0L 6 Cylinder Engine

Make Sure It Fits Your Vehicle

If your off-roading rig doesn't have a thick layer of mud and dirt when the sun goes down, then it's been a wasted day. Don't let the trail beat you in your quest to have the ultimate white-knuckle, full-throttle run. Swap out your old, worn out Jeep 6 cylinder engine parts with some of the premium aftermarket and OEM parts available from 4WheelParts.com and breath new life into your favorite off-roading rig. From an Omix-ADA valve cover gasket to a Crown Automotive oil filter, have all the rugged parts you need, no matter how big or small, to keep your Jeep MJ Comanche 4.0L engine running strong and conquering trails.

Tough Parts for a Hard-Core Engine
4WheelParts.com sells dozens of high-quality replacement parts for your MJ Comanche 4.0L 6-cylinder engine. Whether you're looking for a humble Jeep engine main bearing set or a rugged Jeep MJ Comanche camshaft, we carry them from trusted aftermarket and OEM manufacturers like Omix-ADA and Crown Automotive. We understand that your engine is the heart of your jeeping machine. That's why we only sell the toughest engine parts for your beloved rig. You jeeping adventures take you down some of the gnarliest trails, and 4WheelParts.com gives your Jeep the tools it needs to keep up with everything you throw at it. Swap out your gaskets, pumps and bolts today and get the performance upgrade you've been craving in your preferred rig.

Great Prices on Premium Equipment
4WheelParts.com knows that not everyone is a born mechanic, but you still want to take care of your hard-core jeeping machine. To help you with this, we offer free shipping on all qualifying orders over $99. We also allow you a customer-friendly 30-days, with no restocking fee, to return any items you ordered by mistake. Our 100% Price Match Guarantee means you never have to worry about paying more than the lowest price for anything you order from us. Order those parts you need today and check out why we have so many repeat customers.

130 Product Groups

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Omix-ADA Engine Valve Cover Gaskets

From $24.99

Valve Cover Gasket
California Residents: WARNING

From $24.99

Crown Automotive Head Gasket

From $10.99

Head Gasket
California Residents: WARNING

From $10.99

Omix-ADA Head Gaskets

From $11.47

Head Gasket
California Residents: WARNING

From $11.47

Crown Automotive Engine Lower Gasket Set

From $20.99

Engine Lower Gasket Set
California Residents: WARNING

From $20.99

1.0 1.0 (3)

Crown Automotive Oil Filter

From $11.99

Engine Oil Filter
California Residents: WARNING

From $11.99

Omix-ADA Oil Filters

From $12.83

Oil Filter
California Residents: WARNING

From $12.83

Crown Automotive Engine Oil Pump

From $106.99

Engine Oil Pump
California Residents: WARNING

From $106.99

Omix-ADA Oil Pumps

From $115.34

Oil Pump
California Residents: WARNING

From $115.34

Crown Automotive Engine Oil Pump Screen

From $57.99

Engine Oil Pump Screen
California Residents: WARNING

From $57.99

Crown Automotive Engine Oil Pans

From $103.99

Engine Oil Pan
California Residents: WARNING

From $103.99

3.8 3.8 (20)

Omix-ADA Oil Caps

From $11.34

Oil Cap
California Residents: WARNING

From $11.34

Crown Automotive Oil Filler Cap

From $3.99

Oil Filler Cap
California Residents: WARNING

From $3.99

5.0 5.0 (3)

Crown Automotive Valve Cover Grommet

From $0.99

Valve Cover Grommet
California Residents: WARNING

From $0.99

5.0 5.0 (2)

Omix-ADA Pistons

From $15.71

Piston
California Residents: WARNING

From $15.71

Crown Automotive Engine Piston And Pin

From $41.99

Engine Piston And Pin
No Connecting Rod Included
California Residents: WARNING

From $41.99

Omix-ADA Piston Ring Sets

From $101.92

Piston Ring Set
California Residents: WARNING

From $101.92

Crown Automotive Engine Piston Ring Set

From $102.99

Engine Piston Ring Set
California Residents: WARNING

From $102.99

Crown Automotive Connecting Rod

From $32.99

Connecting Rod
California Residents: WARNING

From $32.99

Crown Automotive Connecting Rod Bolt

From $3.99

Connecting Rod Bolt
California Residents: WARNING

From $3.99

Omix-ADA Main Engine Bearing Sets

From $100.08

Main Engine Bearing Set
California Residents: WARNING

From $100.08

Crown Automotive Crankshaft Thrust Bearing

From $11.99

Crown Automotive Crankshaft Bearing

From $9.99

Oversized crankshaft thrust bearing
.010 inch
California Residents: WARNING

From $9.99

Crown Automotive Connecting Rod Bearing Set

From $26.99

Connecting Rod Bearing Set
California Residents: WARNING

From $26.99

Crown Automotive Camshaft Plug

From $1.99

Camshaft Plug
2-9/64 inch diameter
Camshaft Plug
California Residents: WARNING

From $1.99

Omix-ADA Camshaft Bearings

From $12.04

Camshaft Bearings
California Residents: WARNING

From $12.04

Crown Automotive Intake Valve

From $10.99

Intake Valve
California Residents: WARNING

From $10.99

Crown Automotive Exhaust Valve

From $10.99

Exhaust Valve
California Residents: WARNING

From $10.99

Omix-ADA Intake Valve Stem Seals

From $4.98

Intake Valve Stem Seal
California Residents: WARNING

From $4.98

Crown Automotive Valve Spring Retainer Keeper

From $0.99

Valve Spring Retainer Keeper
6-2 with Valve rotators
Exhaust valves
California Residents: WARNING

From $0.99

Omix-ADA Rocker Arms

From $11.54

Rocker Arm
California Residents: WARNING

From $11.54

Crown Automotive Rocker Arms

From $15.99

Rocker Arm
California Residents: WARNING

From $15.99

1.0 1.0 (2)

Crown Automotive Rocker Arm Pivots

From $1.99

Rocker Arm Pivot
California Residents: WARNING

From $1.99

Omix-ADA Rocker Arm Pivots

From $2.08

Rocker Arm Pivot
California Residents: WARNING

From $2.08

Omix-ADA Rocker Arm Bridges

From $2.77

Rocker Arm Bridge
California Residents: WARNING

From $2.77

Crown Automotive Rocker Arm Pivot Bridge

From $1.99

Crown Automotive Rocker Arm Pivot Bolt

From $0.99

Rocker Arm Pivot Bolt
California Residents: WARNING

From $0.99

3.5 3.5 (2)

Crown Automotive Valve Springs

From $0.99

Valve Spring
California Residents: WARNING

From $0.99

Omix-ADA Valve Lifters

From $26.46

Valve Lifter
California Residents: WARNING

From $26.46

Crown Automotive Valve Lifter

From $19.99

Valve Lifter
Sold individually
California Residents: WARNING

From $19.99

Crown Automotive Push Rod

From $1.99

Push Rod
Sold individually
California Residents: WARNING

From $1.99

Omix-ADA Push Rods

From $1.76

Push Rod
California Residents: WARNING

From $1.76

Omix-ADA Timing Chain Covers

From $101.45

Timing Chain Cover
California Residents: WARNING

From $101.45

Omix-ADA Timing Cover Gasket Sets

From $14.99

Timing Cover Gasket Set
California Residents: WARNING

From $14.99

Crown Automotive Timing Gasket And Seal Kit

From $6.99

Crown Automotive Crankshaft Seal

From $1.99

Crankshaft Seal
California Residents: WARNING

From $1.99

Omix-ADA Crankshaft Oil Seals

From $0.54

Crankshaft Oil Seal
California Residents: WARNING

From $0.54

Crown Automotive Timing Cover Gasket

From $12.99

Timing Cover Gasket
California Residents: WARNING

From $12.99

Omix-ADA Timing Chain Guides

From $22.49

Timing Chain Guide
California Residents: WARNING

From $22.49

Crown Automotive Timing Chain Guide

From $20.99

Timing Chain Guide
California Residents: WARNING

From $20.99

5.0 5.0 (2)

Crown Automotive Timing Kit

From $102.99

Timing Kit
California Residents: WARNING

From $102.99

4.0 4.0 (3)

Crown Automotive Engine Timing Chain

From $118.99

Engine Timing Chain
California Residents: WARNING

From $118.99

Omix-ADA Timing Chains

From $109.84

Timing Chain
California Residents: WARNING

From $109.84

Crown Automotive Camshaft Sprocket

From $23.99

Camshaft Sprocket
California Residents: WARNING

From $23.99

Omix-ADA Camshaft Gear/Sprockets

From $114.66

Camshaft Gear/Sprocket
California Residents: WARNING

From $114.66

Omix-ADA Crankshaft Gear/Sprockets

From $11.54

Crankshaft Gear/Sprocket
California Residents: WARNING

From $11.54

Crown Automotive Crankshaft Sprocket

From $17.99

Crown Automotive Harmonic Balancers

From $0.99

Crown Automotive Harmonic Balancer
California Residents: WARNING

From $0.99

Crown Automotive Oil Slingers

From $1.99

Oil Slinger
NP231, NP242 transfer case
California Residents: WARNING

From $1.99

1.0 1.0 (1)

Crown Automotive Clutch Pilot Bearings

From $16.99

Pilot Bearing
California Residents: WARNING

From $16.99

Crown Automotive Flywheel Ring Gear

From $23.99

Flywheel Ring Gear
California Residents: WARNING

From $23.99

Crown Automotive Flywheel Assembly

From $109.99

Flywheel Assembly
Manual Transmission
California Residents: WARNING

From $109.99

Omix-ADA Exhaust Manifolds

From $164.93

Exhaust Manifold
State Legal: 49 State
In California, this part may not be used upon a highway and may only be used for race purposes
California Residents: WARNING

From $164.93

Crown Automotive Exhaust Manifold Gaskets

From $10.99

Exhaust Manifold Gasket
California Residents: WARNING

From $10.99

1.0 1.0 (8)

Crown Automotive Engine Mounts

From $11.99

Engine Mount
California Residents: WARNING

From $11.99

4.5 4.5 (40)

Crown Automotive Engine Oil Pan Gasket

From $1.99

Engine Oil Pan Gasket
California Residents: WARNING

From $1.99

5.0 5.0 (10)

Omix-ADA Rocker Arm Kits

From $26.90

Rocker Arm Kit
California Residents: WARNING

From $26.90

Crown Automotive Crankshaft Main Bearing Set

From $102.99

Omix-ADA Connecting Rod Bearings

From $10.41

Connecting Rod Bearings
California Residents: WARNING

From $10.41

Omix-ADA Radiator Hoses

From $10.19

Radiator Hose
California Residents: WARNING

From $10.19

Crown Automotive Transmission Mounts

From $10.99

Transmission Mount
California Residents: WARNING

From $10.99

Omix-ADA Valve Cover Gasket Kits

From $12.27

Valve Cover Gasket
California Residents: WARNING

From $12.27

5.0 5.0 (1)

Omix-ADA Timing Chain Tensioners

From $100.78

Timing Chain Tensioner
California Residents: WARNING

From $100.78

Crown Automotive Intake Manifold Gaskets

From $1.99

Intake Manifold Gasket
California Residents: WARNING

From $1.99

Omix-ADA Exhaust Manifold Kits

From $16.99

Exhaust Manifold Kit
California Residents: WARNING

From $16.99

5.0 5.0 (5)

Omix-ADA Exhaust Valves

From $10.80

Exhaust Valve
California Residents: WARNING

From $10.80

Crown Automotive Connecting Rod Bearing

From $10.99

Connecting Rod Bearing
California Residents: WARNING

From $10.99

Omix-ADA Valve Cover Grommets

From $1.45

Valve Cover Grommet
California Residents: WARNING

From $1.45

Crown Automotive Valve Covers

From $32.99

Valve Cover
Plastic
Grommets sold separately
California Residents: WARNING

From $32.99

5.0 5.0 (3)

Omix-ADA Engine Mounts

From $12.07

Engine Mount
California Residents: WARNING

From $12.07

Omix-ADA Valve Cover Mount Kits

From $26.99

Valve Cover Mount Kit
Includes gasket,rubber grommets,oil cap and bolts
California Residents: WARNING

From $26.99

Crown Automotive Engine Mount Kits

From $107.99

5.0 5.0 (2)

Omix-ADA PCV Valves

From $13.99

PCV Valve
California Residents: WARNING

From $13.99

Crown Automotive Oil Pressure Sending Unit

From $11.99

Oil Pressure Sending Unit
California Residents: WARNING

From $11.99

5.0 5.0 (8)

Omix-ADA Automatic Transmission Rebuild Kits

From $251.98

Automatic Transmission Rebuild Kit
California Residents: WARNING

From $251.98

Omix-ADA Flex Plates

From $102.23

Replacement flex plates
Omix-ADA proudly offers high-quality replacement parts for your Jeep vehicle that always meet or exceed OE standards
California Residents: WARNING

From $102.23