• Hey Guest!
    British Car Forum has been supporting enthusiasts for over 25 years by providing a great place to share our love for British cars. You can support our efforts by upgrading your membership for less than the dues of most car clubs. There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Upgraded members don't see this banner, nor will you see the Google ads that appear on the site.)
Tips
Tips

Tappets Hot - Tappets Cold

Share this page

B

bob hughes

Luke Skywalker
Country flag
Offline
OK guys

It says 12 thou hot for tappet settings, anyone have an idea on what they should be cold. - Just putting finishing touches to the refurbed head installation and it is time to set the tappets. I do intend to check them when hot but could do with a starting gap.

Bob
 
In my experience with the 100-4, there is not enough clearance change between hot & cold to make much difference. I expect the Sixes were likely the same.

There was a period when the valve lash tags on the rocker covers could not agree upon whether the lash settings were for hot or cold.
D
Edit---
I looked up the "factory settings"
Valve Cover tags - Valve lash
BN1, BN2 - No tag. Shop manual .012 cold
Except with 100M cam. .015 cold.

BN4, BN6, BN7, BT7 - Brass riveted tag. .012 hot.

BJ7, BJ8 - first - Brass riveted tag. .012 hot.
BJ8 - second - Aluminum riveted tag. .012 cold.
BJ8 third - foil stick on. .012 cold.
D
 
Twelve thousandths of an inch (.012") _hot_ is fifteen thousandths (.015) _cold_, at least it was when I did back to back checks on an MGB engine (2/3s of the Healey) some years ago.

Those values would be for an OEM camshaft, as most of the aftermarket ones I'm familiar with are .018/.020"

If you do set them at .015 cold and check them hot, please let us know the resulting clearance (I wouldn't want to keep perpetuating a myth /bcforum/images/%%GRAEMLIN_URL%%/wink.gif )
 
I never checked them Randy but I set them at 0.013" hot. If you can hear them they be safe just don't let them clack! Some engines want more up to 0.018" never knew why??--Keoke
 
Thanks for the info

For myself, I was guessing at 13 - 14 thou. I will give it a go at 14 and see what the end result is, as long as she runs, we can get back to the hot setting. Whatever that may be !!?
 
I have never seen any difference on my 6 or 4 between hot or cold settings. Always 0.12!
 
healeynut said:
I have never seen any difference on my 6 or 4 between hot or cold settings. Always 0.12!
Click to expand...



-------Don't they Clack!? ?---Keoke- /bcforum/images/%%GRAEMLIN_URL%%/grin.gif
 
Well.

I have just had news from my local Healey specialist, he sets 'em at 12 thou hot or cold and further more does not re-torque the head due to the modern gasket construction. All just as well as they are already set at 12 thou and I do not have the special crows foot spanner to re-torque the nuts partially hidden under the rocker shaft.
 
Back
Top