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Cylinder Head Shims Placement
Posted: Sat Jan 07, 2012 10:56 am
by misszora
Got my numbers dialed in. I am going for a 7.3 CR and need to add .04 to my deck height.
The shims go between the cylinder barrels and the cylinder heads correct? And do I need any Permatex on those?
Thanks!
- paige
Re: Cylinder Head Shims Placement
Posted: Sat Jan 07, 2012 11:37 am
by ruckman101
I thought they went between the cylinder barrels and case.
neal
Re: Cylinder Head Shims Placement
Posted: Sat Jan 07, 2012 12:45 pm
by misszora
This is what I'm trying to determine. I think those are barrel shims and they are a large diameter.
Re: Cylinder Head Shims Placement
Posted: Sat Jan 07, 2012 1:00 pm
by Westy78
If you're at 7.6 without the shims don't use them. One less point for leaks.
Re: Cylinder Head Shims Placement
Posted: Sat Jan 07, 2012 1:03 pm
by Amskeptic
misszora wrote:This is what I'm trying to determine. I think those are barrel shims and they are a large diameter.
The factory
sealing rings up at the
top of your cylinder barrels are the diameter of the barrels, and the
shims are the diameter of the case opening down at the
bottom.
With 2.0 engines, it is recommended to delete the factory sealing rings and set your deck height solely through the use of the shims. HOWEVER > if some knucklehead has over-flycut the heads, you will have to use the sealings rings (little blue stripes on them in the kit) to prevent combustion gas blowby due to incorrect barrel-to-cylinder head spigot clamping. You can actually see between the cylinder barrel wall and the head spigot when you have proper clamping. If the outer fin surface of the barrel hits the outer surface of the head, then you will need the factory sealing ring and you will have to add .028" to your deck height measurement.
Colin
Re: Cylinder Head Shims Placement
Posted: Sun Jan 08, 2012 11:16 pm
by misszora
I did find .04 inch barrel shims online today.
http://www.cip1.ca/ProductDetails.asp?P ... -C10-5185A
Right now I have .010 barrel shims and .030 sealing rings.
Re: Cylinder Head Shims Placement
Posted: Mon Jan 09, 2012 12:11 pm
by Amskeptic
Your final assembly is going to include .040" shims and .030" head sealing rings?
If you *are* using the head sealing rings, please perform this additional step:
After you have torqued the heads to their final torque value of 23 ft/lbs, do another pass and bring them up to
35 ft/lbs. Let sit for at least overnight.
Now going exactly backwards in the sequence, loosen cylinder heads nuts to below 23 ft/lbs, then bring them up to exactly 23 ft/lbs, one nut at a time. You should end at 1 in the sequence diagram.
Colin
(this helps the sealing rings develop a set and hold the final tightening torque through the coming heat/cool cycles)
Re: Cylinder Head Shims Placement
Posted: Mon Jan 09, 2012 12:32 pm
by misszora
yes to your question and I will do that step today!!!
thank you, Colin.
Re: Cylinder Head Shims Placement
Posted: Mon Jan 09, 2012 1:04 pm
by Oregon72
Paige, you should check with Discount Import Parts right here in Portland - Hall Blvd. They had all the right base shims and even endplay shims that I needed. Give a call ahead of time and they can have it waiting for you.
Re: Cylinder Head Shims Placement
Posted: Mon Jan 09, 2012 1:13 pm
by misszora
I am going with Colin's advice from above on the heads.
I've got a big ol' box of endplay shims from A-1 to pick from at the moment.
It's amazing how much time I've spent driving around for just the right part.