Automotive Help

[RngFndr]

i think you're the only other one that noted that it happens in neutral. that's what makes me lean towards bell bolts, loose/missing pressure plate bolt or srping, or possibly a fialed throughtout bearing. if it were anything at all to do with engine balance, it would be all the time. there could be internal transmission problems too, now that i think of it....those wouldn't be evident unless the tranny was being spun, which would happen any time that the clutch pedal is released....even in neutral.

Yep, that is my thinking..

[100Coogn]

Interesting.. While in Neutral, let the clutch out, the whole Trans and engine start shaking, or JUST the shifter stick???

Remember the 300/6 is an externally balanced engine.. Requires a specific flywheel, balanced for the engine, and Pressure plate as well.. Although many Fords have the same Crank Flange pattern, so the wrong Flywheel will bolt in place easily.. And that will cause this problem.. But it should be shaking ALL the time if that was the cause..

If it is just the stick, then it might be bent shaft in the transmission..

Hmmmm???

Just the shifter is shaking upon letting out the clutch.  The engine runs real good.  I agree, a 300/6 is very true engine.
The fact that it's doing in neutral is bugging me.

Coogan

[RngFndr]

Just the shifter is shaking upon letting out the clutch.  The engine runs real good.  I agree, a 300/6 is very true engine.
The fact that it's doing in neutral is bugging me.

Coogan

Yeah, 300/6 is a great motor for trucks a 4WD.. Gear driven and Solid Lifter, like it belongs in a Farm tractor..
Oh, wait a sec, IT DID COME IN A FARM TRACTOR, LOL!

CAP and TomD caught it before I did.. I'm thinking a bent output shaft in the Trans..

You are sure the drive shaft is solid, and still in balance??? Two piece driveshaft??? correctly phased too right???

[RngFndr]

Wait a sec, after more thought, not the output shaft..
It only turns while the Rig is moving.. Would have no
effect in neutral, sitting still..

That leaves the Synchro, Reverse gear shaft, or the Input..
Bad input shaft bearing might do this too..

Guess it depends on how bad the wobble is..

[CAP1]

Wait a sec, after more thought, not the output shaft..
It only turns while the Rig is moving.. Would have no
effect in neutral, sitting still..

That leaves the Synchro, Reverse gear shaft, or the Input..
Bad input shaft bearing might do this too..

Guess it depends on how bad the wobble is..

this is my thinking. 90's tranny is going to be internally shifted through a top mount shifter. any excessive play inside the tranny will cause this.

[Slate]

  Did the vibration start after a clutch or trans replacement? I've seen where the wrong pilot bearing size was installed into the crankshaft (or was not installed, damaged ect.). That will cause the input shaft to wobble and it can do damage internally to the Transmission bearings, gears, or synchros. Generally you will develope a front seal leak on the trans also.
  If there is an inspection plate than you can inspect the clutch and input shaft. Engine Off!

  If you suspect internal trans damage drain the fluid and check for heavy metalic contamination.
  

[100Coogn]

The gentleman, that owns the truck, says everything was good until about a month ago.
It was then he noticed a very light vibration while driving.  It has since developed into a severe vibration.
I've advised him not to drive it anymore.

Coogan

[Masherbrum]

Just the shifter is shaking upon letting out the clutch.  The engine runs real good.  I agree, a 300/6 is very true engine.
The fact that it's doing in neutral is bugging me.

Coogan

EDIT:   Enjoy.

[CAP1]

 Did the vibration start after a clutch or trans replacement? I've seen where the wrong pilot bearing size was installed into the crankshaft (or was not installed, damaged ect.). That will cause the input shaft to wobble and it can do damage internally to the Transmission bearings, gears, or synchros. Generally you will develope a front seal leak on the trans also.
  If there is an inspection plate than you can inspect the clutch and input shaft. Engine Off!

  If you suspect internal trans damage drain the fluid and check for heavy metalic contamination.
  

 excellent!! i hadn't thought of pilot bearing. good thought.

[cobia38]

never could figur out why they call a bushing a bearing 

[JOACH1M]

aren't you 15?

Probably younger than that. 

[CAP1]

never could figur out why they call a bushing a bearing 

because in some instances it is. look it up before posting a response to this. 

[cobia38]

because in some instances it is. look it up before posting a response to this. 

 Really cap ? a bearing consists of 2 races and several Ball/rollers
  A bushing is marely a liner,it has no friction reducing characteristics
   The job of a pilot "bearing" is to keep the input shaft/flywheel alligned

    And BTW, i dont need to " Look it up ", i been in this field for 25 + years,there is alot of things that are missnamed in the auto field 

[CAP1]

Really cap ? a bearing consists of 2 races and several Ball/rollers
  A bushing is marely a liner,it has no friction reducing characteristics
   The job of a pilot "bearing" is to keep the input shaft/flywheel alligned

    And BTW, i dont need to " Look it up ", i been in this field for 25 + years,there is alot of things that are missnamed in the auto field  

 i know you've been in it for awhile. that's why i tried to remind you to look before you posted.


pilot bearing by 1LtCap, on Flickr

 some of those 6 banger fords had pilot bearings, rather than pilot bushings. too many people feel that there is no need to replace them when things are opened up. then bad things happen.

[cobia38]

  lol your missing my point cap, people still think the bronze one is a bearing too,i wasent trying to be harsh towards you.