pulling cam covers

[shadrach74]

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

[JFP in PA]

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:

[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

[Duffy3074]

Because it only retains one cam................

[JFP in PA]

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

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.

[shadrach74]

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.

So, if you crack a cam cover you must find a good MIG welder or your engine is toast???

[JFP in PA]

Originally Posted by shadrach74

So, if you crack a cam cover you must find a good MIG welder or your engine is toast???

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.............