Valve Shims

PostPost by: John Connin <johnc at » Thu Jul 15, 1999 12:25 pm

Group,

Not having set the valve clearances before, I am looking for advice on the
best way of obtaining shims of the correct thickness. I seem to recall
mention of someone running a valve shim exchange program.

The only other reference I have run across is the attached message from
David Andrews from the Sevens list which describes a method of grinding
the shims to desired thickness.

regards,
johnc

-----------------------------------------

Date: Wed, 24 Mar 1999 13:46:15 EST
From: [email protected]
Subject: Re: [sevens] Mechanical Lifters

In a message dated 24/03/99 14:24:19 GMT Standard Time, [email protected] writes:





I use a bench mounted grinder, next to the grinder is a fabricated tower
bolted to the bench made of box section, a hole has been drilled thru the box
section of 13mm diameter, a small holder (outside diameter 13mm) has been made
into which I fix the
tappet shim using a small grub screw, the holder (basically a long piece of
bar with a hole
for the shim in the end) is pushed thru the two holes in the tower until it
contacts the side of the grinding wheel (the tower is shimmed to be absolutely
square), the holder is rotated slowly as the tappet shim contacts the side of
the grinding wheel. When the fit is nearly perfect, the shim holder is mounted
in a drill and the tappet shim is linished with wet and dry, quick accurate
and it gives an excellent finish. If you would like a quick drawing of the
arrangement, let me know, obviously the holder end needs to match the size and
type of the shims being sized.

Dave






John Connin <johnc at
 

PostPost by: paul_adamson » Thu Jul 15, 1999 1:57 pm

John I don't know where you are located but, and I can't remember the exact text of the twink procedure, but from your text I assume that the engine is run in, but is in need of a little attention.
What I have done in the past is:-

Measure all the valve clear
Strip the shimms out of the head and measure them.
Work out the thickness of the shimms required for that valve
if the shim needs to be 10thou thicker add 10 thou to the existing thickness etc
Get them machined form bar stock at a local machine shop with a surface grinder (needed for the flatness)
Install

I found this a lot cheaper than buying shim sets.

Also if you are very carefull and have a fine (material) flat oil stone you can carefull thin them down, place the shim on the oiled stone and move in a figure of eight pattern. Then rotate them 45 degrees relative to your finger and continue. Measure
at frequent intervals .

Hope this helps.

Right time to get in the family plug...
If you are located in the UK (or may be Europe) my father in law will be glad to machine them for you - he runs a precission engineering company.
He does quite a lot of car work for UK classics such as brake calipers for Daimler Darts. His rates seem quite cheep. - but then I'm biased and he lets me do (some of) my own machining!

Brian
---------------------o0o------------------
Brian Scally - Philips Semiconductors Systems Lab. Southampton UK
tel : +44 2380 312654 fax : +44 2380 316303
mailto:[email protected] seri : bscally@ukpsshp1





John Connin <[email protected]> on 15/07/99 14:25:01
Please respond to lotuselan <[email protected]> @ SMTP
To: onelist.com!lotuselan <[email protected]> @ SMTP
cc:
Subject: [lotuselan] Valve Shims
Classification: Restricted
From: John Connin <[email protected]>

Group,

Not having set the valve clearances before, I am looking for advice on the
best way of obtaining shims of the correct thickness. I seem to recall
mention of someone running a valve shim exchange program.

The only other reference I have run across is the attached message from
David Andrews from the Sevens list which describes a method of grinding
the shims to desired thickness.

regards,
johnc

-----------------------------------------

Date: Wed, 24 Mar 1999 13:46:15 EST
From: [email protected]
Subject: Re: [sevens] Mechanical Lifters

In a message dated 24/03/99 14:24:19 GMT Standard Time, [email protected] writes:





I use a bench mounted grinder, next to the grinder is a fabricated tower
bolted to the bench made of box section, a hole has been drilled thru the box
section of 13mm diameter, a small holder (outside diameter 13mm) has been made
into which I fix the
tappet shim using a small grub screw, the holder (basically a long piece of
bar with a hole
for the shim in the end) is pushed thru the two holes in the tower until it
contacts the side of the grinding wheel (the tower is shimmed to be absolutely
square), the holder is rotated slowly as the tappet shim contacts the side of
the grinding wheel. When the fit is nearly perfect, the shim holder is mounted
in a drill and the tappet shim is linished with wet and dry, quick accurate
and it gives an excellent finish. If you would like a quick drawing of the
arrangement, let me know, obviously the holder end needs to match the size and
type of the shims being sized.

Dave




Books, music, auctions, and more. Amazon.com!
<a href=" http://clickme.onelist.com/ad/Amazon6 ">Click Here</a>

------------------------------------------------------------------------










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PostPost by: jimfixit » Fri Jul 16, 1999 6:30 am

I took the time and calculated the shims I needed and ordered them from
Bean...Of course I had the time to wait.
I also heard of combing the wrecking yards for triumphs...
jimbo
----- Original Message -----
From: John Connin <[email protected]>
To: <[email protected]>
Sent: Thursday, July 15, 1999 5:25 AM
Subject: [lotuselan] Valve Shims























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PostPost by: mopho » Fri Jul 16, 1999 6:22 pm

We ordered shims from Bean and they sent us all the wrong sizes, so we had to
grind them anyway. This has happened a lot with them, they send us the wrong
stuff and we have to send it back. It has set us back a lot of time. Beware!
---Morgan Segal
'67 S3

jimfixit wrote:










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PostPost by: jimfixit » Sat Jul 17, 1999 8:50 am

guess it's been some time since I last checked them...5 years?
jimbo
----- Original Message -----
From: Morgan Segal <[email protected]>
To: <[email protected]>
Sent: Friday, July 16, 1999 11:22 AM
Subject: Re: [lotuselan] Valve Shims
































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PostPost by: Foxie » Mon Jul 19, 1999 6:53 pm

I'm doing some work on the cylinder head of my 1970 Plus 2 at the moment.

My machine shop, who does a lot of twincams, has recommended that he bores
the original guides and fitting thin wall phospher bronze inserts into them,
instead of fitting complete new original type bronze guides, (even though I
already have a set of these from Burtons)

He says this is less likely to damage /distort the aluminum head, and is
now the preferred method in the business.

Before I give him the go-ahead, has anybody encountered this type of work,
or have any comments ?

TIA,

Sean Murray
Wexford
Ireland






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