[DeTomaso] Pushrod guideplate adjustment?? [Re-trying to get this post.]

[wkooiman at earthlink.net]

Measuring the distance from the studs sounds like a good idea.

You might also consider taking the heads to a different machine shop.  i.e. not the one that converted the heads to screw-in studs.

Someone mentioned that the rocker studs might have been tapped off center (or crooked).

Regardless, a decent machine shop should be able to tell if the studs are where they're supposed to be.

The bottom line is if the studs are bent or crooked, the rocker will be crooked too, and even if you cut/reweld the guide plates, you're still going to have a rocker related failure.


-----Original Message-----
>From: Dave Londry <davel at emspace.com>
>Sent: Apr 6, 2010 12:17 AM
>To: wkooiman at earthlink.net
>Cc: detomaso Forum <detomaso at realbig.com>
>Subject: Re: [DeTomaso] Pushrod guideplate adjustment?? [Re-trying to get this post.]
>
>No pain Will;
> that's a bonus question Will - and I haven't.
>You can tell I'm used to rockershafts or direct acting.
>I guess I should be able to measure the centre to centre distance of the 
>studs on #8 and compare them to 2 or3 other cylinders.
>(unless the pedestals were bored skewed)
>I'm guessing that they're compcams magnum, everything else is,
> so for $53 for a set plus another $35 to get them here, I can just try 
>a new pair.
>And I'll need some hi-temp threadlock I guess.
>
>You're right.
>I'd really like to get rid of the problem without extra clanging noises.
>dave
>
>wkooiman at earthlink.net wrote:
>> What about the rocker stud?  Have you verified it isn't bent?
>>
>> Sorry to be a pain.  I'd just hate for you to spend lots of time getting it back together only to bend something else.
>>
>>
>> -----Original Message-----
>>   
>>> From: Dave Londry <davel at emspace.com>
>>> Sent: Apr 5, 2010 7:11 PM
>>> To: detomaso Forum <detomaso at realbig.com>
>>> Subject: Re: [DeTomaso] Pushrod guideplate adjustment?? [Re-trying to get this post.]
>>>
>>>
>>> OK I get it. Thanks guys.
>>> Sounds like a "measure lots - tack once" job.
>>>
>>> Will & Jack
>>> - both #8 rockers, all the valves and all the valve springs have been 
>>> replaced.
>>> The pushrods are as straight as my granite flat and I still need to move 
>>> them about 0.110 closer together.
>>> (but that's quite a bit less than when the bent rocker was still there)
>>>
>>> dave
>>>
>>> -------------------------------------------------------------------
>>> Dave,
>>>
>>> I think most people actually cut the guideplates in two and retack them back together once they have the correct alignment.
>>> Julian (Kift)
>>>
>>> ----------------------------------------------------------------------
>>> Actually from that picture it looks like something is bent.  It shouldn't be off by that much.
>>> (Will Kooiman)
>>>
>>> --------------------------------------------------------------------
>>>
>>> hemipanter at hemipanter.se wrote:
>>>
>>> Cut the guidelate in the middle and weld a washer over the connection.
>>> I did this 100:eds of times.
>>> Goran
>>>
>>> JDeRyke at aol.com wrote:
>>>     
>>>> rockers, guide plates and pushrods- are hardened steel and cannot be 
>>>> straightened if even slightly bent. Matter of fact, if anything IS bent, throw it 
>>>> away before it breaks in two and takes out the top end or worse. It may only 
>>>> be a matter of visual perspective, but better to spend a couple of hours 
>>>> checking than find out the hard expensive way. good luck- J DeRyke
>>>> _______________________________________________
>>>>   
>>>> Check everything. All the parts involved- the valve stems, pivot 
>>>> studs, the
>>>>       
>>> -------------------------------------------------------------------------------------------------------------
>>>     
>>>> I'm re-assembling #6143's valvetrain now and I don't see how to do
>>>> guideplate adjustment.
>>>>
>>>> http://www.poca.com/index.php/gallery/?g2_itemId=15138
>>>> The is a pre-teardown pic but it shows my question nicely.
>>>>
>>>> The roller-end of both intake and exhaust  need to be moved outward
>>>> (from the bore centre).
>>>> That means the pushrods need to be closer together.
>>>> Do I put more bend  in the guideplate to do that?
>>>>
>>>> thanks in advance
>>>> dave
>>>> (never did pedestals before)
>>>>
>>>> --
>>>> Dave Londry
>>>> davel at emspace.com
>>>>   
>>>>       
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>>
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