Does anyone know the differential pinion oil seal number for the h-145? I've got numbers of the seal but it doesn't translate into a part # that I can find. Plus a source if you've got one.

not sure on part number but most things i can get from bursons auto parts for my 120y! just ask over the counter they do special orders some times!

Thanks, but I'm in Los Angeles... Don't think I'll be walking into Bursons..

Oreillys, Pep Boys, Rockauto.com, Autozone ... take your pick

Pinion seal
Quote:

If you are replacing the pinion oil seal in an iron housing H145 then be prepared for a little bit of work.

Here's the proper procedure.

Jack up car & remove both rear axles.
Uncouple driveshaft & remove differential.
Mount differential in suitable stand & remove hemisphere & crownwheel assembly
Remove drive flange & extract pinion.
After cleaning housing, replace seal.
Fit new colapsable pinion pre load spacer & refit pinion.
Refit all other parts.
Check & adjust as necessary pinion depth of mesh & preload as well as pinion to crownwheel free play.
Correct as necessary.
Using new gasket, refit differential to rear axle housing.
Re-install axles & refit drive shaft.
refill diff with oil
Run car in gear on jackstands to check that all is well.

Lower car to ground & return it to service.

For alloy housing H145

1. Place car on jacks or hoist.
2. Remove drive shaft & drive flange.
3. replace seal.
4. reverse steps 2 & 1

Quote:
And the pre-load (crush) spacers are NLA...

Replacing the seal and torquing to spec worked for me. You'll know if your diff stays quiet.

•SKF Oil Seal #550219 Partsamerica.com $22.99
Partsamerica no longer around... When's the last time you bought any part for a 1200 at Pep Boys or O'riellys? Haven't had much luck lately..RockAuto lists the wrong seal (for H190 and R180)I actually have 3 new crush spacers for the 145 diff, but was hoping to just replace the seal and retorque. Bad Idea?
Quote:
If you are replacing the pinion oil seal in an iron housing H145 then be prepared for a little bit of work.

Here's the proper procedure.

Jack up car & remove both rear axles.
Uncouple driveshaft & remove differential.
Mount differential in suitable stand & remove hemisphere & crownwheel assembly
Remove drive flange & extract pinion.
After cleaning housing, replace seal.
Fit new colapsable pinion pre load spacer & refit pinion.
Refit all other parts.
Check & adjust as necessary pinion depth of mesh & preload as well as pinion to crownwheel free play.
Correct as necessary.
Using new gasket, refit differential to rear axle housing.
Re-install axles & refit drive shaft.
refill diff with oil
Run car in gear on jackstands to check that all is well.

Lower car to ground & return it to service.

For alloy housing H145

1. Place car on jacks or hoist.
2. Remove drive shaft & drive flange.
3. replace seal.
4. reverse steps 2 & 1

Why don't you need to replace the crush sleeve on an alloy diff housing?

Partsamerica.com has been renamed to oreillyauto.com

I don't buy many parts as the Datsun is very reliable. But I found 1200 parts there two weeks ago.

I would get it from Nissan:
* 38189-18000 SEAL-OIL DRIVE PINION
Only $8.28 in the 2011 catalog, hopefully they won't have to order it from Japan but will have it in stock.

According to Nissan, that part is out of manufacture. However, they did a search for me and found 8 at a dealer in Tennessee. I was gonna get a few, but he said if I got all 8 I could have them at half price each so I got em all. So if anyone needs one I've got extras.

I always loctite the pinion nut back on.