pulsation

[1986montecarlols]

Ok heres the deal, between the speeds of 45-60 miles an hour I have a really big pulsation in the form of both my steering wheel, right wheel and brake pedal all shaking pretty decently.

In the past ive done brake pads
wheel bearings
ball joints
all engine work except a rebuild- all sensors have been replaced and car runs normal

Possible things
I have a few bulges on front tires I know more then 3/8 of an inch they are junk,
bad rims possibly bent
bad transmission or engine mounts
bad brake rotors


I have switched the rims before and it still shakes so I doubt its the tires or rims cuasing hte problem. HOw many motor mounts are there? I dont know this problem is pissing me off, I thought it as just ball joints but apparently not.

 

[megaladon6]

jack up the front end and shake it down, check the bearings (remember, on our cars you can adjust the preload on the bearings), ball joints, tie rods etc. also spin the tires and look for eccentricity in the diameter and the contact path of the tire.

 

[maliburacinfreak]

most likely its the tires, especially if they have bulges (impact breaks). front end parts usually wont cause a vibration, rotors will pulsate only when hitting the brakes. buy some tires man.

 

[1986montecarlols]

well im going to be replacing

the rotors soon anyway as im sure they are junk. I also got a lot of grease from the ball joints behind the dust plate on the brakes. It was funny becuase it was burning off the other day under heaving braking when I stopped my car at my house a lot of smoke was coming out. I thought perhaps the brake caliper was sticking. But it turned out be the grease. This has been happening for a while before I even did the ball joints so I know its not related to the grease. IM going to go out and check the car right now though and report my finding.


EDIT

K I went out there, the right wheel still has a lot of play in it. My friend who did them I remeber putting the sealed bearings in. But he did not put on the cap or something that needs to be sealed in. I dont know, maybe he goofed up. This may be where im getting the pulsation from


Edit there is some play in the left wheel as well but not as much as the right side.

 

[megaladon6]

g-body's don't have sealed bearings. they use a tapered roller bearing which needs to be properly tightened down, and even then as they wear they need to be re-torqued. if they are overtorqued they will wear out very quickly. it's better to be a little loose than tight.

 

[1986montecarlols]

There

was an inner bearing that he put in and tightened, then there was the outer which just slipped inside the rotor. There was some goofy looking cover to hold grease in, he said it was not needed so we tossed them.

 

[maliburacinfreak]

that cap holds grease in the bearings, yes you need it. you are probably running the bearings dry now. did you pack the bearing when you replaced them? if not, it might be time for new bearings again. next time, have someone who knows what theyre doing help you. doesnt sound like your friend does.

 

[1986montecarlols]

Yeah they were packed in real good

I dont have a presser to press the seals in. Ill have to look into it further

 

[87GP]

You don't need a "presser". Actually its called a "Bearing Race and Seal Driver Kit" You can use a soft block of wood and carefully go around the circumference of the seal. Be sure to remove any splinters of wood that may stick to the race or seal.
I'm wondering how did you seat the race if you couldn't seat the seal? The seal should be much easier to install.
Those grease seals that your buddy said you didn't need are what keeps the grease inside the rotor on the spindle. Without them the grease runs out the back and down the shield.