Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: ukturbo2000 on April 17, 2014, 11:01:58 PM

Title: 249 to 242 conversion question
Post by: ukturbo2000 on April 17, 2014, 11:01:58 PM
I have a 98 zj that I'm gonna be doing the 242 conversion on. I have a great right up on the actual conversion but, I want to get rid of the CV front prop for a uj type. How do I go about changing the cv fitting on the axle for a yoke for the uj prop without upsetting the crown and pinion setup.

sent from the new nexus 7

Title: Re: 249 to 242 conversion question
Post by: daggie on April 18, 2014, 07:47:53 AM
I've un done them with a tourque wrench set at the reqiured value, then reversed it for re-assembly :icon_biggrin:
Title: Re: 249 to 242 conversion question
Post by: Delk on April 18, 2014, 11:59:25 AM
I think you will find the front axle will have a crush sleeve that will require replacement. These are one time use and you bin them when disturbed.
Title: Re: 249 to 242 conversion question
Post by: bigjeepzj on April 18, 2014, 02:11:00 PM
if you can get a high pinion axle off  an xj.
just make sure the ratios match

that gives you a high pinion and lower prop angles
Title: Re: 249 to 242 conversion question
Post by: Bubba on April 18, 2014, 06:45:40 PM
I think you will find the front axle will have a crush sleeve that will require replacement. These are one time use and you bin them when disturbed.








it will indeed have a crush that is once only  but in the field if you are careful and have some idea what you are about you can change the seal and or the drive flange and re sett it  and not replace the crush
Title: Re: 249 to 242 conversion question
Post by: ukturbo2000 on April 18, 2014, 07:40:39 PM
Thanks everyone, i think i will have a go at changing it over using the 'careful' method. If it goes tits up i do have another axle i can use.
Title: Re: 249 to 242 conversion question
Post by: Dave69 on April 19, 2014, 08:45:45 AM
if you have a torque wrench then you can verify the torque of the bolts before you remove them where possible. then retighten during asembly
Title: Re: 249 to 242 conversion question
Post by: Delk on April 19, 2014, 03:31:08 PM
The nut is not torqued when new. It is tightened compressing the crush sleeve to set the pinion preload. The more you turn the tighter the preload. The preload is checked with a small torque wrench.

Other then that the nut is very tight and normally I ended up with a bar and a pipe on the end.
Title: Re: 249 to 242 conversion question
Post by: JamesH on April 19, 2014, 04:22:09 PM
I've changed the seal before by marking the nut and counting turns to remove and then re-counting it back on. Mine is a non crush sleeve type diff though so not sure if that makes a difference.
Title: Re: 249 to 242 conversion question
Post by: dtooth on April 20, 2014, 12:47:03 PM
the crush sleeve spacer effects preload on pinion bearings so should be renewed this is also true of the pinion nut too ( but does that  :ecomcity:)