vibration or shaking in steering wheel
 

I have a shaking or vibration in front end sometime when I slow down, not always but sometime. ck my weight on steer tires and recently had new brake and drum on the front. Trk is a frtliner fld 120 yr 2000.

Also have a leak (oil), around turbo said it was from truck idling. Have det. engine with 829000 miles. Is it a way to ck turbo to see if it might be going bad.

Thanks in Advance

Possibly the shocks?

Could be ride height, exact same thing happened to the neighbor in our shop. She claimed it was front end as well.

Re: vibration or shaking in steering wheel
 

the Goodyear shop in Jackson Ms behind the Flying J has a really good truck front end man, I suggest you take it there.

Dave Nemo had a guy on one time who was discussing vibration issues and he said that if you think it is in the front end check the back end.

Both trucks that I have driven in the last year had a front end vibration, both felt the same but different problems. First, was caused by a bad shock, the mount was loose, cupped the front tire badly. New shocks and new steer tires solved this. 2nd was at 30,000 miles on a new truck, one of the steer tires was out of balance, had a severe wheel vibration, cupped out and had to be replaced. 80,000 miles later, no vibration, steer tire still in good shape.

Best bet is take it to a repair shop that specializes in alignment/front end work.

Does the vibration come in at a certin speed and then go away?? If so it could be a wheel balance problem. Where is your 5th wheel positioned? Is it more twards the rear axle or more twards the int axle?

Thx for the replies, Yes it start shaking between 45 and 50 mph, after that it stop.

Turbo---- Are you letting your truck idle for about 3 minutes if you have to shut down after hard pull? The turbo is very hot and if the oil that is circulating stops circulating because the motor is shut off the oil will burn or "coke" on the turbo shaft and eventually the burned oil will get built up enough that it will ruin the seals causing leaks. And like the shop told you to much idlilng.

When you idle especially at low rpms not enough cylinder temp is created and this allows oil to sneak past the rings eventally coming to rest in the turbo and then leaking out

Front end shaking----- Get a good three axle alignment. The rear ends have to be square to the frame and parrallel to each other and the front axle has to be parallel to the rears. And the rears have to be in line with each other.

I had the 45 to 50 shake and wobble. I knew when it would start and when it would stop. Some road types it would not do it. More or less crown, flat etc.

There was a alignment guy on Dave Nemo a couple years ago and he described this wooble problem to a "T" . He said that the rear ends are the problem. So I started measuring and using strings and got the rears allot closer and the wooble went away. Then I got a three axle alignment and the alingment shop got everthing to within a 1000ths of a degree. Truck is perfect now. One rear had to be moved 7/32"

Also take the top off your power steering pump tank and with your truck at a idle look inside if it is foamy looking you have air getting in some how and that might cause a wooble in your steering.

Hope this helps
Mike

[quote="9200IH"]Turbo---- Are you letting your truck idle for about 3 minutes if you have to shut down after hard pull? The turbo is very hot and if the oil that is circulating stops circulating because the motor is shut off the oil will burn or "coke" on the turbo shaft and eventually the burned oil will get built up enough that it will ruin the seals causing leaks. And like the shop told you to much idlilng.

When you idle especially at low rpms not enough cylinder temp is created and this allows oil to sneak past the rings eventally coming to rest in the turbo and then leaking out

The cold idle causes unburnt fuel to condense in the manifold/ turbo/ exhaust pipe and drip out... appearing like oil