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Balance your pressure plates, even when new.

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Balance your pressure plates, even when new.
#1
Mitchman2 Avatar
Mitchman2 Mitchell Andrus
Mills River, NC, USA   USA
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Even when new, they can be way off.

Mine from Moss (AP made for a TD) required a 20 gram weight (approx 4 US quarters) to get it right.


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Re: Balance your pressure plates, even when new.
#2
TD4834 Avatar
TD4834 Bill Chasser
Sacramento, CA, USA   USA
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1950 MG TD
1951 MG TD
1951 MG TD MkII
1952 MG TD MkII    & more
Always! Good catch Mitchell


Bill Chasser
TD-4834
TD-5779
TD/c-8151
TD/c-16920
TD-19408
TD-24060

TF-8200

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Re: Balance your pressure plates, even when new.
#3
Paul J Avatar
Paul J Silver Member
Locust Grove, OK, USA   USA
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1955 MG TF 1500
Mitch, Was it spun balanced? PJ

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Re: Balance your pressure plates, even when new.
#4
MGTF1500 Ardeche France Avatar
MGTF1500 Ardeche France Thierry SUCHIER
TOURNON SUR RHONE, Rhône-Alpes Auvergne, France   FRA
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1955 MG TF 1500
How do you do balancing?
At a tire fitter?
Sincerely, Thierry de l'Ardèche

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Re: Balance your pressure plates, even when new.
#5
Ctwidle Chris Twidle
Reesville, Queensland, Australia   AUS
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1954 MG TF
I have just sent my crankshaft, pulley, flywheel and pressure plate away to be dynamically balanced as a unit. I believe there are only 2 places in my nearest city, Brisbane, that have the equipment to do this type of work. I don’t think a tyre balancer could do it.
I will do the static balancing of the pistons and rods at home.
Chris

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Re: Balance your pressure plates, even when new.
#6
MGTF1500 Ardeche France Avatar
MGTF1500 Ardeche France Thierry SUCHIER
TOURNON SUR RHONE, Rhône-Alpes Auvergne, France   FRA
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1955 MG TF 1500
At a turner then.
Sincerely, Thierry

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Re: Balance your pressure plates, even when new.
#7
Buckdendave David Hill
St Neots, Cambridgeshire, UK   GBR
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1954 MG TF
Yes, any decent machine shop that works on car engines can usually do it.
Dave H

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Re: Balance your pressure plates, even when new.
#8
Mitchman2 Avatar
Mitchman2 Mitchell Andrus
Mills River, NC, USA   USA
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In reply to # 3644804 by Paul J Mitch, Was it spun balanced? PJ

Yes, along with the crank and flywheel. The crank was new billet from Steve Baker, the flywheel was original and needed about 1/4 gram removed (drilled).


The Flat Earth Society has members from all corners of the globe.

'30 Model A Ford Town Sedan
'48 MGTC Q Special
'53 XK120SE OTS
'58 MGA roadster
'66 Series 1, 4.2 Jag E-Type OTS

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Re: Balance your pressure plates, even when new.
#9
Mitchman2 Avatar
Mitchman2 Mitchell Andrus
Mills River, NC, USA   USA
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In reply to # 3644861 by MGTF1500 Ardeche France How do you do balancing?
At a tire fitter?
Sincerely, Thierry de l'Ardèche

Machine shop. Rotated and marked. Search Youtube to see it done.


The Flat Earth Society has members from all corners of the globe.

'30 Model A Ford Town Sedan
'48 MGTC Q Special
'53 XK120SE OTS
'58 MGA roadster
'66 Series 1, 4.2 Jag E-Type OTS

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Re: Balance your pressure plates, even when new.
#10
Ctwidle Chris Twidle
Reesville, Queensland, Australia   AUS
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1954 MG TF
Just heard from the machine shop, my crank and flywheel balanced fine but what i assumed was the original pressure plate is out by 90g! He tried the 180o option and it was twice as bad! Will visit in the morning to discuss options.

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Re: Balance your pressure plates, even when new.
#11
Mitchman2 Avatar
Mitchman2 Mitchell Andrus
Mills River, NC, USA   USA
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In reply to # 3645233 by Ctwidle Just heard from the machine shop, my crank and flywheel balanced fine but what i assumed was the original pressure plate is out by 90g! He tried the 180o option and it was twice as bad! Will visit in the morning to discuss options.

90 grams will rattle the beer cans in the cockpit. Seriously, this stuff so far out of balance, you could spend the rest of your life adjusting the carbs trying to get to run right.....

And we wonder why crankshafts break.


The Flat Earth Society has members from all corners of the globe.

'30 Model A Ford Town Sedan
'48 MGTC Q Special
'53 XK120SE OTS
'58 MGA roadster
'66 Series 1, 4.2 Jag E-Type OTS

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Re: Balance your pressure plates, even when new.
#12
LaVerne Avatar
LaVerne LaVerne Downey
Fruita, CO, USA   USA
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1954 MG TF "Green Hornet"
1969 MG MGB "The Beater"
1979 Triumph TR8 "Turd 8"
This was a TD engine that hadn't been opened up since before 1974 that I worked on last year. Apparently nothing new.


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Re: Balance your pressure plates, even when new.
#13
hurst280 Avatar
hurst280 Sean D
Plano, TX, USA   USA
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1954 MG TF "Yellow Bird"
Here is my moss pressure plate after balance! The car ran about 200 miles with the unbalanced new pressure plate before the crankshaft broke in half. Thanks Moss!


Patience gets you nowhere fast!


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IMG_20170101_131033.jpg

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Re: Balance your pressure plates, even when new.
#14
Ctwidle Chris Twidle
Reesville, Queensland, Australia   AUS
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1954 MG TF
I took a spare pressure plate (possibly MGB, I believe it is compatible) to the machinist yesterday. It was only 3grams out compared to the original being 90g out, guess which I will be using? When we looked closely it was apparent that the holes for the dowel pins in the original didn’t allow the pressure plate to sit concentric with the flywheel. I wonder what it had felt like to drive?

I had the friction plates replaced but it appears the new ones are thicker than the originals so they supplied a set of washers to hold the pressure plate further from the flywheel. Sounds a bit Mickey Mouse, anyone seen that before? I suppose further down the track I could remove them and extend the clutch life - though it is probably optimistic to think I am ever going to drive enough miles to wear out a clutch.

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Re: Balance your pressure plates, even when new.
#15
Buckdendave David Hill
St Neots, Cambridgeshire, UK   GBR
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1954 MG TF
As long as it functions and fits inside the bell housing, I guess that it's ok and better than what you had. Though it shouldn't come to this - a non-concentric clutch cover is junk.
Dave H

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