05-20-2013, 08:50 AM
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#1
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Registered User
Join Date: Jun 2012
Location: Frederick MD
Posts: 658
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pulling cam covers
I used the search, but I found no info on my question.
Both cam coves are leaking enough to create smoke when stationary. Tried to re-torque and that made it worse. I have the cam lock left over from the IMSB retrofit that was done at an indy.
2 questions:
1) What size bolt is used to hold the cam locks in place.
2) the cam locks that came with the IMSB retrofit look very different from one another. Does the IMSB retrofit come with the tools to secure both cams on the 5 chain engine in my 2002 S?
I suspect the IMSB came with one cam lock for the 5 chain engine and one for the 3 chain engine. I am in a pickle as to how to secure both cams at the same time without spending money on buying or fabing a second part...
Ross
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05-20-2013, 08:55 AM
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#2
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,583
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You cannot use the tools for locking the cams to hold and retain the cams when removing the cam covers, that requires entirely different set of tooling.
This is what a home brewed version of Porsche's cam holding tool look like:
A nicer made unit:
And this is the factory unit:
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
Last edited by JFP in PA; 05-20-2013 at 10:03 AM.
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05-20-2013, 10:23 AM
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#3
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Registered User
Join Date: Jun 2012
Location: Frederick MD
Posts: 658
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Thanks JFP,
Can I ask why the the LN units cannot be used? In looking at you picture, I cannot see the reason why?
R
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05-20-2013, 10:43 AM
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#4
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Registered User
Join Date: Dec 2012
Location: Scotland
Posts: 44
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Because it only retains one cam................
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05-20-2013, 11:53 AM
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#5
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
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Quote:
Originally Posted by shadrach74
Thanks JFP,
Can I ask why the the LN units cannot be used? In looking at you picture, I cannot see the reason why?
R
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Very simply: Because the cam holding tool screws into the end of the cam rather than slides into a slot as the locking tool does, and therefor has a much better grip on the cams. There is a lot of spring pressure on the cams and you do not want to have them move away from the cylinder head saddles when the upper saddles (part of the cam cover) are removed.
And just a by-the-by, be very careful with the cam covers, they are machine matched to the mating cylinder head, and cannot be mixed or replaced.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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05-20-2013, 12:11 PM
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#6
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Registered User
Join Date: Jun 2012
Location: Frederick MD
Posts: 658
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Quote:
Originally Posted by JFP in PA
Very simply: Because the cam holding tool screws into the end of the cam rather than slides into a slot as the locking tool does, and therefor has a much better grip on the cams. There is a lot of spring pressure on the cams and you do not want to have them move away from the cylinder head saddles when the upper saddles (part of the cam cover) are removed.
And just a by-the-by, be very careful with the cam covers, they are machine matched to the mating cylinder head, and cannot be mixed or replaced.
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So, if you crack a cam cover you must find a good MIG welder or your engine is toast???
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05-20-2013, 01:16 PM
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#7
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,583
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Quote:
Originally Posted by shadrach74
So, if you crack a cam cover you must find a good MIG welder or your engine is toast???
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Basically; the cam cover and cylinder head saddles are machined as one assembled unit, switch covers on a head and the saddle journals no longer match and are out of round making the new assembly useless, which is why Porsche sells them as a set.
And these alloys are easier to weld with a TIG than a MIG welder.............
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
Last edited by JFP in PA; 05-20-2013 at 01:45 PM.
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05-20-2013, 03:20 PM
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#8
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Registered User
Join Date: Jun 2012
Location: Frederick MD
Posts: 658
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What's interesting is that a friend that works for an Indy swears that the LN lock is a knock off of the factory tool. He also said that valve spring forces are very low at TDC. And that he has done this procedure a number of times with the slotted locks.
I'm not ringing in personally as i have no idea, just tryin to get as much info as possible, unfortunately some of it's contradictory...
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05-21-2013, 02:14 AM
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#9
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,583
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Quote:
Originally Posted by shadrach74
What's interesting is that a friend that works for an Indy swears that the LN lock is a knock off of the factory tool. He also said that valve spring forces are very low at TDC. And that he has done this procedure a number of times with the slotted locks.
I'm not ringing in personally as i have no idea, just tryin to get as much info as possible, unfortunately some of it's contradictory...
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The LN tool is a knock off of the OEM tool, but of the cam locking tool, not the cam holding tool; they are two different items with different part numbers.
Your indy is correct in that spring pressures are reduced at TDC, but they are still there or you would not need the locking tool to keep the cams from moving while doing an IMS witht the engine at TDC. The cam locking tool keeps the cams from turning under spring pressure, the cam holding tool keeps the cam in the journal saddles after the cam cover is removed, other wise one end of the cam would simply pop up from spring pressures, possibly breaking the cam itself.
At the end of the day, it is your car, and you can do it any way you please........
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
Last edited by JFP in PA; 05-21-2013 at 02:17 AM.
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05-21-2013, 04:55 AM
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#10
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Registered User
Join Date: Jun 2012
Location: Frederick MD
Posts: 658
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I'm buttoning it up and taking it to a different Indy that has the hold down tools. This is a DIY that will cost more interns of time, effort and specialty tools than it's worth. The tolls alone are $500 to buy or $50wk to rent. Having the tools fabeducated adds an unknown cost and time to completion. The whole ting appears to be a PIA that I'll happily pass on to a pro.
Thanks for talking me down of the edge. I'm sure I could have completed it but the returns of the DIY we're minimal (if at here are any at all) and the risks great...
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05-21-2013, 04:56 AM
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#11
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Registered User
Join Date: Jun 2012
Location: Frederick MD
Posts: 658
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JFP, are you actually in PA and of so, where?
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