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V8
Chronicles Internet discussion from V8SHO mailing list Here is more discussion about the V8 Cams, newest e-mails in the first batch, then the original batch posted to this page earlier: I am working on a 96 SHO with 56,000 miles at work. It has a frozen
exhaust cam on the rear head, causing the splines to strip on the intake cam and also
bending all the exhaust valves. This is now going to be an expensive repair. A bare
cylinder head is $1100.00, cams are 993.00 each, ------------ While we were on the subject I got to thinking about which cam fails the
most. So does anyone know which cam it is? The rear bank intake cam has 2 sprockets, one
for he drive chain and one for the slave chain that drives the rear exhaust cam. The front
exhaust cam also has 2 sprockets just like the rear intake. Is it the failure of one of
the slave drive sprockets on the 4 cams or one of the big driven sprockets that are bolted
onto the front of the front E. cam and rear I. cam? -------------- I think it's mostly failure of the main drive cams, not the slave cams.
The main cams are doing double duty. I think Ford goofed when they designed these. If you
look at the 2.5L engine, which these are derived from, you'll see that it has a different
set up. One chain running one bank and another chain running the other bank. No slave
chain. -------------- The hollow tube cams are a Ford design. All new OHC Ford engines use the
hollow cam design. 4.6's and such have a cam gear that bolts to the camshaft. 2.5 and 3.0
have the gear swedged like ours. And Ford had to give final approval of the design. --------------- The Maxima uses hollow cams as well. Nothing wrong with hollow cam design.
It lowers the rotational mass. -------------- Also ford has TSB for a ticking noise in the 2.5 V6.. requires replacement
of all the valve train drive components. all chains tensioners etc. Problem with them is
they tick on start-up and does not go away... --------------- HERE IS THE ORIGINAL DISCUSSION POSTED ON THIS PAGE Mike Holhut's cam sprockets are starting to go. He was getting a loud ticking noise in his engine. Doug Lewis listened to it and confirmed it was the sprocket loosening up on the cam. He explained how it is designed...piss poor design....and what the fix is. The sprockets are only swedged onto the camshaft. He said the valve covers need to come off and the sprocket needs to me MIG welded to the cam...all 4 sprockets. MIG weld each sprocket to the cam with 3 welds. He said the cost of having this done is about $400...what he charges. Mike is driving his back to Massachusetts and is going to get it done there. As I remember things of interest from the convention I will post them. I have that CRS thing...can't remember sh_t....old age as I turn 46 tomorrow.
Do you have any more detailed information about this, or do we need to pester Doug
about it? If I were to take this info to a decent mechanic, would they know what to do, or
is there a certain precision or tolerance involved?
Doug said to put 4 spot welds on each cam sprocket. The cam is hollow so you need
someone good. Doug's fee would be ~$400.00. Of course while your there a new tranny, 100k
mile valve adjustment, spark plugs......... Shouldn't cost more than $4000.00 or so. :)
I hear a quiet rattling/ticking coming from my engine, but it's hard to hear over the
other regular engine sounds. It sounds like it's coming from maybe the intake manifold or
something. I never had a chance to hear Holhut's car at Tulsa, but is that the sound his
was making? www.picturetrail.com/allegrosho SHO Club Member UDP Firestone Firehawk SP50s 225/55/R16 Nimzified Intake w/K&N Panel Coustic 2x200W Amp 2x10" Bostons Audio Access Panel 26mm Sway Bar Super Stealth Custom G-Tech Thrush Turbos/No Res
Kenny I would think you are just hearing the chain clicking in the sprockets and the
tensioner. You should have a miss if the sprockets shift. When you are up next to a wall
with the windows down and rpms up high you can real hear the high pitched noise the chains
make. Sounds great.
Kenny,
Kenny, Mike's were pretty loud at idle, it definitely sounds like something is wrong.
Plus the sound went away when he revved it a bit.
Hi Tim,
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