Flywheel Question

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.

igotta40

igotta40

10 Year 15 Year
Joined
Oct 16, 2006
Threads
71
Messages
1,801
Location
Houston, TX
Can someone advise approximately how much I should expect to be quoted for resurfacing my flywhel? It's a 2F motor.
 
Thanks for the replies. I will keep the step/recess in mind.
 
John Smith said:
My guys do it for $20. Make sure they know about the step that should be retained if they are not familiar with LC flywheels.
Click to expand...

Retaining the step is largely a myth; your pressure plate is designed to accomodate the changing thickness of the clutch disk as it wears, and it is equally capable of compensating for the relatively small "step" between the friction surface and the shoulder.

I didn't want them to try to pull the pins out of mine so I had them surface the friction surface only and leave the shoulder alone. Absolutely no problems.
 
I just go over it with a sanding disc on an angle grinder until the surface is nice and evenly swirly ('cause that's what my mechanic did), and it's all good.
 
amaurer said:
Retaining the step is largely a myth; your pressure plate is designed to accomodate the changing thickness of the clutch disk as it wears, and it is equally capable of compensating for the relatively small "step" between the friction surface and the shoulder.
Click to expand...




This kind of thought concerning a F engine/flywheel/three finger clutch assembly will net you less effective clamping force and accelerated clutch disc/pressure plate/flywheel wear since the disc will be allowed to slip easier.

The step on this style flywheel is opposite of the 2F/diaphragm clutch assembly.
 
I like the sanding disk idea, thanks.

Reading Steve's reply got me confused. My memory isn't what it used to be. The truck is a 1974 but 22 years ago the F engine threw a valve thru #1 piston so we got a 1976 donor truck and swapped motors. I know I put the three finger clutch and the 2/74 four speed back in, but now I can't recall which flywheel I used. Probably the one from the F engine. I'd put up a picture but it's still in the truck.
 
Have it turned, retain the step per factory specs, adjust your heights and youll be golden. Dont just resurface with a cookie wheel. If that hasnt been out in 22 years, its time to have it ground right down, there are bound to be hot spots and a few little cracks that the quick surface job wont get out.
 
igotta40 said:
I like the sanding disk idea, thanks.

Reading Steve's reply got me confused. My memory isn't what it used to be. The truck is a 1974 but 22 years ago the F engine threw a valve thru #1 piston so we got a 1976 donor truck and swapped motors. I know I put the three finger clutch and the 2/74 four speed back in, but now I can't recall which flywheel I used. Probably the one from the F engine. I'd put up a picture but it's still in the truck.
Click to expand...





Then you will have the three-finger flywheel/F engine flywheel, as the three-finger clutch pressure plate will not work on the 2F, or diaphragm clutch flywheel.
 
Poser said:
This kind of thought concerning a F engine/flywheel/three finger clutch assembly will net you less effective clamping force and accelerated clutch disc/pressure plate/flywheel wear since the disc will be allowed to slip easier.

The step on this style flywheel is opposite of the 2F/diaphragm clutch assembly.
Click to expand...

How big is the step on the F flywheel? I recall checking the specification for the clutch disk thickness and the variation in the disk thickness over life was so much larger than the size of the step as to make it negligible.
 
amaurer said:
How big is the step on the F flywheel? I recall checking the specification for the clutch disk thickness and the variation in the disk thickness over life was so much larger than the size of the step as to make it negligible.
Click to expand...



These are the step measurements on the F style flywheel and the 2F style flywheel...



F Flywheel uses the three-finger pressure plate. .630" step or 16.002mm


2f Flywheel uses the diaphragm style pressure plate. .020" step or .508mm




Again, from here <---- this is a link



Since the clutch discs are interchangeable between the two pressure plates, it only stands to reason that if you increase the step height, that you will lessen the clamping force.



I spent a couple weeks trying to figure out why my three-finger clutch was slipping after only a couple thousand miles of use, only to find that my step height was over 19mm. The step had not remained consistent during the years that it had been resurfaced. The machine shops had only cut the clutch disc wear surface.

Ding. :idea:





Differences in flywheels, treerootCO’s post from the best 2F thread:



treerootCO said:
I got out the scale for fun and was surprised that both the 3 speed and 4 speed pressure plates weighed in at 25lbs. The 4 speed flywheel is 34lbs and the 3 speed is 37lbs.
Click to expand...



attachment.php






:beer:
 
$30 here on Saturday, cash, while you wait. At least that's how I got mine done!
 
Thanks again for the help. Thanks for the links also. I get it about the step now, good info to have when I take it in.
 
74 F with 4 speed

For a couple of months in 1974, F motors came with a 4 speed using the old 3 Finger type clutch. (Just some useless trivia)

Mine was one of them.
 
You must log in or register to reply here.

Share this page

Back
Top Bottom