Fairchild Club Forum

On Sat, Aug 11, 2018 at 9:34 PM, Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub] wrote:
 
Hi Everyone,

While dealing with my leaky cam housing cover and loose studs...

With the cam housing cover off, it seemed a good time to check valve
clearances. They were not too good. Charles happened along and reminded
me the intake clearances are .030", not .015" like the manuals say. I
set them all to .030".

Then I thought, "How about valve timing?" First I set  #1 valve
clearances temporarily to .015" per the Overhaul Manual before
measuring. Intake opens about 9-10 deg. BTDC where it should be 15.
That's 5-6 degrees late. Exhaust closes  14-15 degrees late. So intake
is 5-6 deg late and exhaust 14-15 deg late. My Overhaul Manual says to
'balance' intake and exhaust errors which I assume means 'split the
difference', AND they should be within 2 degrees. It seems obviously
impossible to get both within 2 degrees. The best I can do according to
my rough calcs is to set intake about 5 degrees early and exhaust about
5 degrees late. (split the difference) There must be something here I'm
missing! I'd appreciate any advice I can get from you guys on valve timing.

Next question, I need to loosen the cam gear and turn it a few notches,
but unfortunately the nut is on quite tight. Is there a nice way to hold
the cam from turning without removing it from the engine?

Thanks guys,

David

  With the vertical drive shaft engaged with the camshaft gear, holding the prop will prevent the camshaft from rotating while loosening the camshaft nut. 
On Sat, Aug 11, 2018 at 9:34 PM, Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub] wrote:
 
Hi Everyone,

While dealing with my leaky cam housing cover and loose studs...

With the cam housing cover off, it seemed a good time to check valve
clearances. They were not too good. Charles happened along and reminded
me the intake clearances are .030", not .015" like the manuals say. I
set them all to .030".

Then I thought, "How about valve timing?" First I set  #1 valve
clearances temporarily to .015" per the Overhaul Manual before
measuring. Intake opens about 9-10 deg. BTDC where it should be 15.
That's 5-6 degrees late. Exhaust closes  14-15 degrees late. So intake
is 5-6 deg late and exhaust 14-15 deg late. My Overhaul Manual says to
'balance' intake and exhaust errors which I assume means 'split the
difference', AND they should be within 2 degrees. It seems obviously
impossible to get both within 2 degrees. The best I can do according to
my rough calcs is to set intake about 5 degrees early and exhaust about
5 degrees late. (split the difference) There must be something here I'm
missing! I'd appreciate any advice I can get from you guys on valve timing.

Next question, I need to loosen the cam gear and turn it a few notches,
but unfortunately the nut is on quite tight. Is there a nice way to hold
the cam from turning without removing it from the engine?

Thanks guys,

David

> On Aug 11, 2018, at 11:34 PM, Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub] wrote:
>
> Hi Everyone,
>
> While dealing with my leaky cam housing cover and loose studs...
>
> With the cam housing cover off, it seemed a good time to check valve
> clearances. They were not too good. Charles happened along and reminded
> me the intake clearances are .030", not .015" like the manuals say. I
> set them all to .030".
>
> Then I thought, "How about valve timing?" First I set #1 valve
> clearances temporarily to .015" per the Overhaul Manual before
> measuring. Intake opens about 9-10 deg. BTDC where it should be 15.
> That's 5-6 degrees late. Exhaust closes 14-15 degrees late. So intake
> is 5-6 deg late and exhaust 14-15 deg late. My Overhaul Manual says to
> 'balance' intake and exhaust errors which I assume means 'split the
> difference', AND they should be within 2 degrees. It seems obviously
> impossible to get both within 2 degrees. The best I can do according to
> my rough calcs is to set intake about 5 degrees early and exhaust about
> 5 degrees late. (split the difference) There must be something here I'm
> missing! I'd appreciate any advice I can get from you guys on valve timing.
>
> Next question, I need to loosen the cam gear and turn it a few notches,
> but unfortunately the nut is on quite tight. Is there a nice way to hold
> the cam from turning without removing it from the engine?
>
> Thanks guys,
>
> David
>
>
>
> ------------------------------------
> Posted by: Ranchaero Wing Shop
> ------------------------------------
>
>
> ------------------------------------
>
> Yahoo Groups Links
>
>
>

 
The correct valve clearance is .015 for intake and .030 for exhaust. From table of limits.
JOHN

Sent from my iPhone

> On Aug 11, 2018, at 11:34 PM, Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub] fairchildclub@yahoogroups.com wrote:
>
> Hi Everyone,
>
> While dealing with my leaky cam housing cover and loose studs...
>
> With the cam housing cover off, it seemed a good time to check valve
> clearances. They were not too good. Charles happened along and reminded
> me the intake clearances are .030", not .015" like the manuals say. I
> set them all to .030".
>
> Then I thought, "How about valve timing?" First I set #1 valve
> clearances temporarily to .015" per the Overhaul Manual before
> measuring. Intake opens about 9-10 deg. BTDC where it should be 15.
> That's 5-6 degrees late. Exhaust closes 14-15 degrees late. So intake
> is 5-6 deg late and exhaust 14-15 deg late. My Overhaul Manual says to
> 'balance' intake and exhaust errors which I assume means 'split the
> difference', AND they should be within 2 degrees. It seems obviously
> impossible to get both within 2 degrees. The best I can do according to
> my rough calcs is to set intake about 5 degrees early and exhaust about
> 5 degrees late. (split the difference) There must be something here I'm
> missing! I'd appreciate any advice I can get from you guys on valve timing.
>
> Next question, I need to loosen the cam gear and turn it a few notches,
> but unfortunately the nut is on quite tight. Is there a nice way to hold
> the cam from turning without removing it from the engine?
>
> Thanks guys,
>
> David
>
>
>
> ------------------------------------
> Posted by: Ranchaero Wing Shop david@ranchaerowingshop.com
> ------------------------------------
>
>
> ------------------------------------
>
> Yahoo Groups Links
>
>
>

  With the vertical drive shaft engaged with the camshaft gear, holding the prop will prevent the camshaft from rotating while loosening the camshaft nut. 
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On Aug 13, 2018, at 6:37 PM, Ranchaero Wing Shop david@ranchaerowingshop.com [fairchildclub] wrote: