[Fot] Dual Valve Springs

[Duncan Charlton]

Some people have used compressed air (thru spark plug hole) to hold the valves
closed while undoing the collets and springs, but I prefer the method of
pushing some cotton cord down through the spark plug hole and then using the
piston to keep the valves pushed upward.

Duncan
(Texas)


On Jun 17, 2012, at 10:32 AM, walt at hot-tr6.com wrote:

> I have replaced broken springs on my TR6 racecar without removing the
cylinder head. First do a compression check to confirm that there is no
internal damage to the combustion area. Run the piston to the top of the
cylinder you are working on. Then do as you stated to replace springs,
retainers, keepers. I also found that a bent slender screwdriver works
inserted through the spark plus hole to keep the valve you are working on from
slipping down. Roller rockers are nice. I use a double roller rocker setup and
i like it.
> Walt Hollowell of Albuquerque, New Mexico responding from Nevis Island in
the Carribean.
>
> Quoting "Tylerpthompson at yahoo.com" <Tylerpthompson at yahoo.com>:
>
>> I had a miss at high rpms.  My distributor had a lot of wobble at the top
of
>> the shaft so replaced it. Although it ran stronger at low speeds, the miss
at
>> high rpms was still there. I pulled the valve cover and found the number 4
>> inner valve spring was broken. Thanks to Jim Gray (again) for suggesting I
>> check this.
>>
>> I am wondering what may have caused this.  I am also wondering if I should
>> pull the head to see if it caused any damage but since it ran very smooth
at
>> low rpms, I am thinking I was just getting some valve float at high rpms.
>>
>> I am going to replace all the springs at this point to make sure.  I think
I
>> can raise the piston to TDC for each cylinder, and use the valve spring
>> compressor for on head removal.  Have others done spring replacements this
way
>> or should I just pull the head?
>>
>> Finally, what springs do folks use?  In searching the web, it seems rare
to
>> see a valve spring break, but I have not heard what experiences other FOT
>> users have had. I have a Paeco 6600 rpm cam, titanium retainers, and
chrome
>> moly push rods as well as a rebuilt rocker assembly, but those roller
rockers
>> sure do look nice!
>>
>> Thanks in advance for your helpful advice and Happy Fathers Day to all the
>> dads out there.
>>
>> Ty
>>
>>
>> Sent from my iPad
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