: rear pinion bearing



devin28
09-19-12, 12:52 AM
Hey yall. Seems the rear pinion bearing is shot. Seems the seal busted as well. Gear oil is all over the back of the
rearend where the pinion seal is. Shifts very hard into reverse because the yoke or whatever it is is banging against the bottom of the car. Driving it makes a loud clanking/humming/rattling? noise. Not so bad when im on the gas. I can really here it when i let off the gas. Not until i come to a complete stop the noise stops. Any tips or advice yall can give me before i attempt to swap this out? any special tools needed? Thanks for the help!

2001 cadillac catera. 3.0 v6

JohnJJO
09-19-12, 04:25 PM
Bearing Noise

Differential Pinion Gear Bearings

Worn bearings tend to perform the following conditions:
-Tend to aggravate and magnify the drive.
-Tend to float and coast the noise.
-Tend to result in heavy, irregular drive noise on constant acceleration and float.
-Tend to result in an irregular noise on deceleration. Rough bearings tend to perform the following conditions:
-Tend to aggravate and magnify the drive.
-Tend to float and coast the noise.
-Tend to result in heavy, irregular drive noise on constant acceleration and float.
-Tend to result in an irregular noise on deceleration. Loose bearings tend to perform the following conditions:
-Tend to aggravate and magnify the drive.
-Tend to float and coast the noise.
-Tend to result in heavy, irregular drive noise on constant acceleration and float.
-Tend to result in an irregular noise on deceleration. Rough or brinelled pinion bearings produce a continuous whine. This whine persists when coasting with the transmission in neutral even to a low speed. End play in the pinion gear bearings, even from natural wear, which permits the pinion to feed back into the ring gear, causes a noise on overrun or coast.


Rear Wheel Bearings
Rough or pitted rear wheel bearings that are can be are responsible for a growling noise. The first impression of this growling noise could be suspected as a differential noise. The noise, however, does not vary on drive or coast. Additionally, the noise persists when coasting with the transmission in neutral. Frequently this noise can be readily identified by the sound being conveyed in an eccentric form. The noise can also be intermittent as the noise may fade for a short period. Perform the following steps to confirm the diagnosis of a rear wheel bearing noise:
1.Support the rear of the vehicle on safety stands.
2.Start the engine.
3.Disengage the traction control.
4.Raise the engine speed up to a fast idle with the top gear engaged.
5.Use a stethoscope to compare the noise of one bearing against the other.
6.Keep the volume adjustment down low to obtain the best results.
7.A difference in the noise of the rear wheel bearings can also by discerned by placing a steel-shafted screwdriver to the ear and in close proximity to each bearing in turn. A noticeable difference in noise can usually be observed between a good and an excessively worn bearing.


Differential Carrier Side Bearings

Side bearings produce a constant grinding noise of a slower nature than pinion bearings. Side bearing noise cannot be determined by the diagnosis procedure for rear wheel bearing noise, but is in the same frequency as the rear wheel bearings.

Common Causes of Bearing Related Noises
The following list are common causes of bearing related noises:
1.Low lubricant level.
2.Incorrect lubricant used.
3.Foreign matter in the lubricant.
4.Incorrect preload setting.
5.Incorrectly mounted bearings (e.g. dirt trapped behind abutment faces during the assembly).


Determining Type of Noise

Tire Noise
Tire noise can easily be mistaken for differential noise even though the noisy tires may be located on the front of the vehicle. Tire noise may change with different road conditions, whereas, differential noise is more speed and/or torque (load) sensitive. Eliminate tire noise before proceeding to diagnose a deferential noise.

Wheel Bearings
The following conditions cause a noise similar to tire noise:
-Worn wheel bearings.
-Brinelled wheel bearings.
-Chipped wheel bearings.
-Damaged wheel bearings. The noise is constant if the noise does not vary on drive or coast and if the noise still persists when coasting with the transmission in neutral. This noise does not noticeably change on differing road surfaces to the same degree as does tire noise. Although not so pronounced, wheel bearing noise can also be compared to a road surface noise, which is produced when the vehicle is traveling over uneven or rough road surfaces.

Backlash Clunk
The following conditions cause excessive clunk with acceleration and deceleration:

-A worn differential drive pinion gear.
-A worn differential case.
-An excessive clearance between the inner CV joint shaft and the differential side gear splines.
-An excessive clearance between the differential side gear hub and the counterbore in case.
-A worn differential pinion and side gear teeth.
-An excessive differential drive pinion gear-to-differential ring gear backlash. The entire differential assembly should be disassembled and inspected if it is determined that the differential components are damaged or excessively worn.

Drive-Line Snap
A snap on sudden start, either forward or reverse, may be caused by a loose pinion flange. Replace the nut or the flange if the pinion flange is loose. Refer to Pinion Oil seal and Flange Replacement.

Engine And Other Contributing Factors
The following noises are occasionally confused with the differential noises:

-Noises which originate from the engine.
-Noises which originate from the transmission.
-Noises which originate from the muffler. Perform the following steps to isolate these noises:

1.Carefully note the approximate vehicle speed and the conditions where the supposed differential noise is most pronounced.
2.Ensure the vehicle is in a quiet place to avoid interfering noises.
3.Ensure the vehicle is stationary.
4.Run the engine up and down slowly through the engine speeds that correspond to the vehicle speeds at which the noise was prominent.
5.Observe whether there is any similarity to a differential noise.
6.Muffler noises are usually readily identified. The exception being when a muffler emits a high-pitched periodic whistling noise that may be confused with a bearing noise.

Noise Diagnosis - Rear Drive Axle

97627


Ring and Pinion Gear Noise
Noise produced by the ring and pinion gearset is of a cyclic nature. The following is a list of the noises:

-A drive noise. A drive noise is most pronounced on constant acceleration through the speed range of 50 km/h to 90 km/h (33 mph to 60 mph) .
-A coast noise. A coast noise is most pronounced when the vehicle is allowed to coast through the speed range from 90 km/h to 50 km/h (60 mph to 33 mph) .
-A flat noise. A flat noise is most pronounced while the vehicle is kept at a constant speed for periods between 50 km/h and 90 km/h (33 mph and 60 mph) . Differential noise always changes when comparing drive and coast. Differential noise usually ceases when coasting with the transmission in neutral at speeds under 50 km/h (33 mph) .

Differential Side and Pinion Gear Noise
The noise produced by the differential side gear and pinion gear occurs when there is an excessive wear between the side gear hubs and the differential case bores. This can cause a clunking noise when the vehicle is driven at low speeds. Noise produced due to excessive wear between the gear teeth is most pronounced on turns.

Common Causes of Gear Related Noises
The following list are the common causes of gear related noises:

-A low lubricant level.
-An incorrect lubricant used.
-An incorrect meshing of the gear teeth (i.e. incorrect pinion positioning shim or incorrect backlash setting adjustment).
-Scored gear teeth. Scored gear teeth are usually the result of incorrect lubricant type or incorrect lubricant level.
-Endplay in the bearings.
-Bruised teeth.
-Chipped teeth.
-An excessive runout of the differential drive pinion gear head.
-Ring gear backlash.
-Ring gear creeping on the differential carrier. Ring gear creeping on the differential carrier results from loose ring gear bolts. This noise usually appears as a sharp metallic sound when shifting from reverse to first gear.

JohnJJO
09-19-12, 04:37 PM
Removal Procedure

97628


1.Raise and support the vehicle. Refer to Vehicle Lifting.
2.Support the differential with a transmission jack (1).
3.Disconnect the ABS sensor connectors (2).
4.Remove the drive axles. Refer to Wheel Drive Shaft Replacement.
5.Remove the propeller shaft. Refer to Propeller Shaft Replacement - Two Piece.
6.Remove the rear propeller shaft coupling.

97629

7.Remove the automatic level control height sensor bolt.

97630

8.Remove the differential support bracket bolts (1).

97631

9.Remove the differential bushing bolts (1).
10.Remove the differential.


Installation Procedure

97633

1.Use the transmission jack to raise the differential into the mounting position.
Notice: Refer to Fastener Notice in Service Precautions.

97632

2.Install the differential bushing bolts (1).
Tighten the differential bushing bolts (1) to 100 Nm (74 ft. lbs.) .



3.Install the differential support bracket bolts (1).
Tighten the differential support bracket bolts (1) to 90 Nm (66 ft. lbs.) + 38 .
4.Install the rear propeller shaft coupling.
5.Install the propeller shaft. Refer to Propeller Shaft Replacement - Two Pieces.
6.Install the drive axles. Refer to Wheel Drive Shaft Replacement.

97634

7.Install the automatic level control height sensor bolt.
Tighten the height sensor bolt to 14 Nm (124 inch lbs.) .

97635

8.Connect the ABS sensor connectors (2).
9.Remove the transmission jack (1).
10.Refill the differential with proper lubricant. Refer to Lubricant Level Check.
11.Lower the vehicle.
12.Test drive the vehicle.
13.Inspect the vehicle for leaks.

JohnJJO
09-19-12, 04:59 PM
i think u can find dead body for sale on ebay if u try really hard
look what i found
http://www.ebay.com/itm/CADILLAC-CATERA-REAR-AXLE-SERVICE-TRAINING-MANUAL-VHS-/370541205548

devin28
09-19-12, 05:29 PM
So i see the step by step instructions. Ummm so this is a process? Will i need a press for the new bearings if i attempt this challenge? It sounds pretty difficult.

JohnJJO
09-19-12, 07:28 PM
Differential Side Bearings Disassemble

Tools Required
J 22888-20A Universal Puller

1.Install the J 22888-20A to the differential carrier.
2.Remove the differential carrier side bearings from the differential carrier.
97638

JohnJJO
09-19-12, 07:35 PM
u can replace just the seal
http://www.rockauto.com/catalog/moreinfo.php?pk=1299200
inspect bearings if they ok leave them alone, u have to press them out
97639

Side Bearings part number is gm90446654
there is one on ebay , i have idea where u can get second one
http://www.ebay.com/itm/VAUXHALL-OPEL-GM-CADILLAC-Catera-1X-BEARING-SET-Differential-Side-Gear-90446654-/180959556826?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2a2207b4da&vxp=mtr
if i would be u, i just get whole used Differential assembly and replaced using instructions that i previously gave it to u - its to complicated to replace thous bearings

MoistCabbage
09-19-12, 10:16 PM
If he's hearing noises/feeling vibrations, the bearings are long gone.

devin28
09-23-12, 03:08 PM
Im going to attempt to tear this down and see what i can find. I bought the one side bearing on ebay. Need to find a few more bearings it looks like. 2 side bearings and 1 pinion bearing correct?

JohnJJO
09-24-12, 01:51 AM
thats correct but pinion is different side but listen u have good luck to replace thous bearings... u no even know what pain in ass is that , thats why i recommended to u just to get used one, whole differential and for u to know. warp bearing will not cost shakiness just noise until it really really, im saying REALLY bad