|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
10-10-2023, 11:27 AM | #1 |
Senior Member
Join Date: May 2010
Location: Bucks Co, Pa
Posts: 3,740
|
Zeroing in a fly wheel cover
As the title says I'm zeroing in a FW cover and and the surface is too pitted and makes the indicator dance around too much for a good reading. I'm thinking of a laser. I can make a fixture to bolt it to the crankshaft, that's not a problem. I'm using a Starrett "Last Word" and a Etalon and the ball gets caught in the pits. What I need is a laser device to do the reading.
Terry |
10-10-2023, 01:08 PM | #2 | |
Senior Member
Join Date: Jan 2020
Location: SF Bay Area
Posts: 1,080
|
Re: Zeroing in a fly wheel cover
Quote:
__________________
JayJay San Francisco Bay Area ------------------------ 1930 Murray Town Sedan 1931 Briggs S/W Town Sedan Last edited by JayJay; 10-10-2023 at 01:22 PM. |
|
Sponsored Links (Register now to hide all advertisements) |
|
10-10-2023, 02:08 PM | #3 |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,521
|
Re: Zeroing in a fly wheel cover
Hey Terry, I think most people misunderstand this process, ...and quite honestly I used to also.
When you read the Service Bulletins and understand the instruction, the process is not to shim the Flywheel Housing into alignment, ...but the indicator is used to just check the FW Housing to verify it is in alignment. The only place that shims were allowed is in the upper two holes, -and this was to compensate for the gasket thickness. If installing a 0.010" shim in the two holes where the tabs are did not bring the housing into alignment, then Ford specified to install a new housing. New ones are available today, -or some original housings can be machined. I modified a grinder by installing a large faceplate to be able to re-machine a flywheel housing where both sides are coplanar. Click on the link below to see what is happening; https://youtu.be/2GDg5AT2TmI |
10-10-2023, 02:23 PM | #4 |
Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,904
|
Re: Zeroing in a fly wheel cover
It is a good idea to grind the two ends, even if you don't clean up all the pits. For one thing, the side that mounts to the block has to make a good seal where the rear cam bearing is. A lot of flywheel housing are not flat there which has lead to leaks. As far as indicating it, clean up the face with a flat file, just enough to get rid of any rust and burrs, and then indicate where there are not pits. Check the fit to the block by trying to insert feeler gauges after bolting the housing to the block without a gasket.
__________________
A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
10-10-2023, 03:05 PM | #5 | |
Senior Member
Join Date: May 2010
Location: Bucks Co, Pa
Posts: 3,740
|
Re: Zeroing in a fly wheel cover
Quote:
Terry |
|
10-10-2023, 03:26 PM | #6 | |
Senior Member
Join Date: May 2010
Location: Bucks Co, Pa
Posts: 3,740
|
Re: Zeroing in a fly wheel cover
Sponsored Links (Register now to hide all advertisements)
Quote:
Terry |
|
10-10-2023, 03:58 PM | #7 |
Senior Member
Join Date: Apr 2018
Location: Mebane NC
Posts: 2,358
|
Re: Zeroing in a fly wheel cover
I wonder if you could fill the pits with SteelStik or another steel putty.
|
10-10-2023, 04:04 PM | #8 | |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
|
Re: Zeroing in a fly wheel cover
Quote:
First, there must be enough flat surface left to do this. After simple cleaning with a file, make up a shoe for your indicator. Take a ordinary high tool speed tool bit, say a 3/8 square by 3 inches long and braze a pin to the middle of the tool bit that will fit in the indicator receiver hole. Now check the pin for 90 degrees to the bottom surface of the bit using another indicator. Close is good enough. Grind the corners off the bottom of the tool bit so it will slide easily over the surface being checked. Now try checking your housing surface. |
|
10-10-2023, 06:03 PM | #9 | |
Senior Member
Join Date: Jun 2014
Location: Melbourne, Australia
Posts: 7,497
|
Re: Zeroing in a fly wheel cover
Quote:
__________________
I'm part of the only ever generation with an analogue childhood and a digital adulthood. |
|
10-10-2023, 07:23 PM | #10 | |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
|
Re: Zeroing in a fly wheel cover
Quote:
I never use body filler for anything. It is a Mickey Mouse way of doing a job quick and very poorly. There are a few of us left that prefer to do things to old day standards. I chopped a 41 Ford coupe once with NO lead of fillers that won best in show for body work. |
|
10-10-2023, 09:40 PM | #11 |
Senior Member
Join Date: Nov 2018
Location: Farmington MI
Posts: 284
|
Re: Zeroing in a fly wheel cover
All the "Last Word" indicators that at I have are .001
Maybe he needs a dial indicator that has removable tips, then use a "button" tip. Joe |
10-10-2023, 10:45 PM | #12 |
Senior Member
Join Date: Aug 2010
Location: SF Bay Area
Posts: 195
|
Re: Zeroing in a fly wheel cover
A small block of steel- even a 6" machinists scale placed between the indicator tip and the housing surface will allow you to check the runout as the surface irregularities will get averaged out.
|
10-10-2023, 10:45 PM | #13 |
Senior Member
Join Date: Jan 2020
Location: SF Bay Area
Posts: 1,080
|
Re: Zeroing in a fly wheel cover
I stand corrected - I was thinking of my “BesTest” that I use for machine setup, which is 0.0001”. Thanks for the sanity check.
__________________
JayJay San Francisco Bay Area ------------------------ 1930 Murray Town Sedan 1931 Briggs S/W Town Sedan |
10-11-2023, 06:31 AM | #14 | |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,521
|
Re: Zeroing in a fly wheel cover
Quote:
Actually, this uses one of the new CBN (-industrial diamond) grinding heads instead of a grinder rock. The CBN does not use coolant, and the surface really does not build heat. I am only taking about 0.002" per cut which really doesn't generate a lot of heat. Most housings will be between 0.010" - 0.020" out, so after I make the last pass that has continuous grinding, I just let it run until it sparks out and then it is dead-on. This also gives the housing plenty of time to cool if there is any heat build-up. FWIW, I have not even bothered indicating one we installed in the last couple of years, as the first ones we did always hit in the 0.001" - 0.003" range which is well within the 0.006" spec. |
|
10-11-2023, 11:45 AM | #15 |
Senior Member
Join Date: Feb 2011
Location: Lincoln, Nebraska
Posts: 1,910
|
Re: Zeroing in a fly wheel cover
Leave the dial indicator above the flywheel a small amount and then use a feeler gauge between it and the flywheel housing.
__________________
Dave / Lincoln Nebraska |
10-11-2023, 01:03 PM | #16 |
Senior Member
Join Date: Mar 2021
Posts: 130
|
Re: Zeroing in a fly wheel cover
That is a great use for a flywheel grinder. If memory serves me right the original shims where .008.
|
10-11-2023, 05:14 PM | #17 | |
Senior Member
Join Date: Jun 2014
Location: Melbourne, Australia
Posts: 7,497
|
Re: Zeroing in a fly wheel cover
Quote:
__________________
I'm part of the only ever generation with an analogue childhood and a digital adulthood. |
|
10-13-2023, 08:22 PM | #18 |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
|
Re: Zeroing in a fly wheel cover
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|