Home 
Home Search search Menu menu Not logged in - Login | Register
> Jensen Healey & Jensen GT Tech > Engine & Transmission > Valve clearenc on a rebuilt head

 Moderated by: Greg Fletcher
New Topic Reply Printer Friendly
Valve clearenc on a rebuilt head  Rating:  Rating
AuthorPost
 Posted: 09-03-2013 08:25 pm
  PM Quote Reply
1st Post
George
Member
 

Joined: 04-05-2005
Location: Boyds, Maryland USA
Posts: 88
Status: 
Offline
Hi guys.  I got a rebuilt head that looks to be in good shape from someone who didn't know much about it.  Now, I am not sure about how to set the valve clearances.  I thought maybe I could measure the clearances without a shim in and then do the math to figure the size shim I needed.  However, it occurred to me that this would not take into account the amount the shims sit down into the spring retainers.  Is this a standard depth?  Or is there some other way I should be doing this?  Or do I need to get a machine shop involved?

 

Thanks

george

Back To Top PM Quote Reply  

 Posted: 09-03-2013 08:50 pm
  PM Quote Reply
2nd Post
Jensen Healey
Super Moderator


Joined: 03-11-2005
Location: San Anselmo, California USA
Posts: 977
Status: 
Offline
Do you have any shims at all? Maybe one of the east coast guys has a box of shims you could use to get close before you start buying the exact shims you need.

Back To Top PM Quote Reply

 Posted: 09-03-2013 09:41 pm
  PM Quote Reply
3rd Post
George
Member
 

Joined: 04-05-2005
Location: Boyds, Maryland USA
Posts: 88
Status: 
Offline
Thanks for the idea.  I do have some shims and I thought maybe I could use them to get a measurement as a basis for the size shim I needed, but they all seem to be too thick (no clearance at all with them in place)

Back To Top PM Quote Reply  

 Posted: 09-03-2013 11:21 pm
  PM Quote Reply
4th Post
Dakota123
Member
 

Joined: 03-20-2009
Location: Colorado USA
Posts: 126
Status: 
Offline
In some cases the pad on the underside of the bucket may contact the valve stem, allowing you to take the measurement with no shims.  You can tell by putting a thin smear of grease on the valve stem tip and see if it gets transferred to the bucket when you place it on top.  If it doesn't then you can take up the gap by using washers or scrap hard plastic or something (as long as it's rigid and flat).  There's a good chance that first measurements are only going to get you in the ballpark (+/- a few thousandths) anyway so this method isn't as hokey as it sounds.

Back To Top PM Quote Reply

 Posted: 09-04-2013 12:30 pm
  PM Quote Reply
5th Post
LambandAndy
Member


Joined: 10-21-2005
Location: Eastanollee, Georgia USA
Posts: 72
Status: 
Offline
George,

I have a set of shims that I had ground to the minimum thickness to use at as a starting point.  Send me your address to limey01@aol.com and I can mail them to you.

Andy

Back To Top PM Quote Reply  

 Posted: 09-05-2013 07:53 pm
  PM Quote Reply
6th Post
George
Member
 

Joined: 04-05-2005
Location: Boyds, Maryland USA
Posts: 88
Status: 
Offline
Thanks, Andy !  Will do. 

I had another thought, would it work to put a sraight edge across the top of the retainer and measure the gap to the top of the valve, then add this measurement to the size of the shim needed?  I am getting a little out of my depth here . . .  Anyway, the thin shims you have should do the trick

thanks again

g

Back To Top PM Quote Reply

 Posted: 09-05-2013 10:28 pm
  PM Quote Reply
7th Post
Dakota123
Member
 

Joined: 03-20-2009
Location: Colorado USA
Posts: 126
Status: 
Offline
The pad on the underside of the bucket will sit down below the top of the retainer, so that won't work.  Here's an image of the underside of the follower:

http://qedmotorsport.co.uk/qed-shop/view-all-products-in-shop?keyword1=cam%20follower%20bucket


Back To Top PM Quote Reply  

 Posted: 09-06-2013 12:51 pm
  PM Quote Reply
8th Post
George
Member
 

Joined: 04-05-2005
Location: Boyds, Maryland USA
Posts: 88
Status: 
Offline
I knew those pads were there, but I hadn't fully considered their implications!  Thanks for the advice.  I'll wait for Andy's thin shims.

 

g

Back To Top PM Quote Reply

Current time is 05:07 am  
> Jensen Healey & Jensen GT Tech > Engine & Transmission > Valve clearenc on a rebuilt head Top




UltraBB 1.172 Copyright © 2007-2011 Data 1 Systems