When replacing a cam & lifters, new or refaced lifters should always be
used. All cam lobes & all lifters should be checked by a reliable
machine shop for a hardness of RC 55 or better. Even one soft lobe or
lifter will screw up the works. It's just too much work & expense to
replace the cam & lifters with parts that have not been verified.
Cam manufacturers & regrinders - even the best - DO occsionally get
the hardening wrong or overlook a lifter in a set.
Regards,
Dave Russell
Robert Blair wrote:
>> Guys, Pls keep us posted on your findings and
>
> progress....
>
> Robert.
>
>
>> I just discovered the same on my followers yesterday when I
>> removed them from my 3000 head. Some were fine, others pitted. A
>> couple badly pitted. I was wondering over night if perhaps it
>> was tied to either exhaust or inlet valves, or was just random.
>> Haven't checked that out yet this morning (I numbered them all
>> when they came out). I am now worried that the cam lobes are
>> likewise worn, and I need to go check. Is there a tendency for
>> exhaust valve cam lobes and followers to wear faster than inlet?
>> Or vise versa? Or, should there be even wear - to no wear? Nice
>> and smooth. Within some mileage expectation. Don't know how many
>> miles are on the engine as the car is somewhat new to me. But,
>> it is not more than about 30k miles since the last rebuilt so the
>> wear seems a bit unusual. Unless, as you mention, the cam was
>> badly ground. In any event, I have new followers and a new cam
>> sitting on the bench, so away I go.
>>
>> Regards, Dave
>>
>>
>> -----Original Message----- From: sebring@illawarra.hotkey.net.au
>> To: healeys@autox.team.net Sent: Sun, 13 May 2007 4:11 AM
>> Subject: Valve job and Cam Complications
>>
>>
>> I was forced to remove my 3000 head due to a blown head gasket.
>> While it was off I set up a dial indicator on top of a pushrod
>> and for each lobe I set it at the zero lift or lowest position. I
>> rotated the crank and cam and measured the actual lift of each
>> lobe. The result was quite a variation at each lobe which I read
>> as uneven wear on each one. I then pulled the followers and
>> discovered some were heavily pitted. All of the above made me
>> believe the non-standard cam had been badly ground or
>> unacceptably worn or both. Net result a fresh cam grind on a
>> spare stock cam, new followers and finally a new head gasket . At
>> the moment it is all disassembled in the garage (shop) Regards
>> Joe
>
>
>
> Robert - Yellow 65BJ8 rnbmail@yahoo.com Cell: 408-221-5244
|