Rumbling when releasing clutch from start

[wareagle]

I posted the same question at the same time to a Yahoo Ford group I belong to(helps to have multiple resources when figuring something like this out) and was told to check the accelerating pump diaphragm and the power valve in my carb. Now that I feel confident checking, but getting into the bell housing would take a mechanic.

 

[m78]

What does it do if you tried starting off in second gear ?

 

[Alvin in AZ]

I posted the same question at the same time to a Yahoo Ford group I belong
to(helps to have multiple resources when figuring something like this out) and
was told to check the accelerating pump diaphragm and the power valve in
my carb. Now that I feel confident checking, but getting into the bellhousing
would take a mechanic.

Did I get you confused? :/

I thought I read where you said you were a mechanic in the army and familiar
with all sorts of tools etc.

The older I get, the dumber I get. :/

Alvin in AZ
ps- 2 shy of an M-80's question is a good one.
pps- How's it feel? Like it's the carburetor or the clutch?

 

[wareagle]

What does it do if you tried starting off in second gear ?

Same thing.

 

[wareagle]

Did I get you confused? :/

I thought I read where you said you were a mechanic in the army and familiar
with all sorts of tools etc.

The older I get, the dumber I get. :/

Alvin in AZ
ps- 2 shy of an M-80's question is a good one.
pps- How's it feel? Like it's the carburetor or the clutch?

Unfortunately, I worked on these in the Marines....
http://en.wikipedia.org/wiki/Amphibious_Assault_Vehicle

Until the carb was even mentioned by this other guy, I was totally thinking it had something to do with the clutch or anything associated with the clutch.

 

[Alvin in AZ]

Unfortunately, I worked on these in the Marines....
http://en.wikipedia.org/wiki/Amphibious_Assault_Vehicle
Until the carb was even mentioned by this other guy, I was totally thinking it
had something to do with the clutch or anything associated with the clutch.

EEEEEEEEEEEEEEEEEEEEEeeeeeeeeeeeeeeeeeeeeEEEEEEEEEEk!!!

That's the sound of prying information out of wareagle.

Butthead in AZ

 

[wareagle]

EEEEEEEEEEEEEEEEEEEEEeeeeeeeeeeeeeeeeeeeeEEEEEEEEEEk!!!

That's the sound of prying information out of wareagle.

Butthead in AZ

What did I leave out

 

[Alvin in AZ]

What did I leave out?

LOL

Quit bangin' your head on the wall and tell us about how it acts and what
it feels and acts like and -when- it feels and acts that way. Rattle on like
you're from Arizona? You have our only clues to what's wrong with it and
there is definitely something wrong with it, no doubt about that.

After you got it in gear, clutch out and rolling slow and you let off the gas
and then you give it a little gas again... does it act the same way?

...or only in the process of using the clutch?

Here's some words for you to use...

stumbles
hesitates
jumpy
shudders

Butthead in AZ

 

[wareagle]

LOL

Quit bangin' your head on the wall and tell us about how it acts and what
it feels and acts like and -when- it feels and acts that way. Rattle on like
you're from Arizona? You have our only clues to what's wrong with it and
there is definitely something wrong with it, no doubt about that.

After you got it in gear, clutch out and rolling slow and you let off the gas
and then you give it a little gas again... does it act the same way?

...or only in the process of using the clutch?

Here's some words for you to use...

stumbles
hesitates
jumpy
shudders

Butthead in AZ

Gotcha... Okay, from a dead stop after I have her in gear and start letting off the clutch while at the same time pressing the gas pedal the whole truck starts shaking. The shaking occurs only until I have fully released the clutch and am just pressing the gas. Now, if I apply more gas when releasing the clutch, then the shaking is reduced. The problem with this is that I'm worried I will burn up the clutch by attempting this method for a prolonged period of time, so this is definitely not an option.

 

[Alvin in AZ]

Gotcha... Okay, from a dead stop after I have her in gear and start letting off
the clutch while at the same time pressing the gas pedal the whole truck starts
shaking. The shaking occurs only until I have fully released the clutch and am
just pressing the gas. Now, if I apply more gas when releasing the clutch, then
the shaking is reduced. The problem with this is that I'm worried I will burn up
the clutch by attempting this method for a prolonged period of time, so this is
definitely not an option.

BTDT
All that.
Many times!
Last time I took it apart, I -only- swapped out the wallered out oil-lite
pilot bearing for a 6303 ball bearing and fixed mine pretty dangged good.

That's not a cure, it was just a band-aid/experiment.

Alvin in AZ
ps- So... it's not the carburetor.
We were on the right track to start with.

 

[fatherdoug]

I am still getting a severe rumbling of the whole truck when I put in 1st gear and start driving. Goes away quickly, but is still there. The flywheel has been resurfaced and I have a new clutch kit on it. Supposedly the drive shaft was balanced as well...

Anyone else know what else it could be? I have a 1970 F100, 360 with a T85N 3 speed tranny..

Thanks in advance,
Steven

I rumble a little bit when I release too. Sorry, I couldn't hold back any longer.

 

[wareagle]

BTDT
All that.
Many times!
Last time I took it apart, I -only- swapped out the wallered out oil-lite
pilot bearing for a 6303 ball bearing and fixed mine pretty dangged good.

That's not a cure, it was just a band-aid/experiment.

Alvin in AZ
ps- So... it's not the carburetor.
We were on the right track to start with.

Alright, remember I'm new on this, by pilot bearing, which part of the vehicle are we talking about???

 

[wareagle]

I rumble a little bit when I release too. Sorry, I couldn't hold back any longer.

I rumble a lot, especially after eating Taco Bell for lunch

 

[kiwi f150]

Alright, remember I'm new on this, by pilot bearing, which part of the vehicle are we talking about???

Pilot Bearing fits into the crankshaft like this

One thing i would suggest is that if/when you pull out the gearbox you take the flywheel down to a reputable engineering workshop and have them check for any "high" spots on the flywheel which they can "true up" on a good lathe and also get them to balance it as well.

I tend to agree with Alvin when he is saying that a misalignment problem with your bellhousing can cause this and a roller bearing such as shown in the pic above is a lot more forgiving than the standard solid bushing that i imagine is fitted in the back of your crankshaft at present.

Cheers Mark

 

[wareagle]

Prepare for moron question.... Wait for it.....

That is the back of the engine in the picture with the flywheel removed, right? And the roller bearing is smack dab in the middle?

 

[kiwi f150]

Prepare for moron question.... Wait for it.....

That is the back of the engine in the picture with the flywheel removed, right? And the roller bearing is smack dab in the middle?

Yep bearing is smack in the middle.

Cheers Mark

 

[wareagle]

on the back of the engine behind the flywheel

 

[kiwi f150]

on the back of the engine behind the flywheel

Yep welcome to skinned knuckles and a new opportunity to string together curses in ways you never thought of before.

On the plus side this is also an opportunity to buy new tools - always a good thing.

Cheers Mark

 

[wareagle]

Yep welcome to skinned knuckles and a new opportunity to string together curses in ways you never thought of before.

On the plus side this is also an opportunity to buy new tools - always a good thing.

Cheers Mark

Looking forward to it!!!!! Haven't really cussed badly since I was in the Marines...

 

[BKW]

I posted the same question at the same time to a Yahoo Ford group I belong to (helps to have multiple resources when figuring something like this out) and was told to check the accelerating pump diaphragm and the power valve in my carb. Now that I feel confident checking, but getting into the bell housing would take a mechanic.

Bogging down, hesitating, stumbling from a dead stop and when accelerating at speed are indications that the accelerator pump and its check valve are defective.

But I doubt these parts (and the pilot bearing) are causing the problem.

Oil on the flywheel/pressure plate/clutch disc caused by a rear main seal leak, greasy hand prints on the clutch disc, worn clutch disc/pressure plate, warped flywheel will all cause "clutch chatter" the usual term for your problem.

Once a flywheel is warped, turning it down will not solve anything, because once it's warped, it's warped forever.

All turning it down will do...is remove the blue heat spots, but these will re-appear within a short time.

I doubt the power valve has anything to do with your problem. It's clutch disc/pressure plate flywheel related.