smdl
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| posted on 28/10/06 at 09:49 PM |
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Zetec Cam Sprocket Removal
Need some help with this one.
I am just in the process of putting on vernier cam sprockets on my ST170, disabling the VCT in the process, but I am struggling with removing the main
cam sprocket bolts.
In one area of the Ford manual, is says:
"NOTE: Use an open-ended wrench to prevent the camshaft from rotating."
In another area, it says:
"NOTE: Hold the camshafts by the hexagon with an open-ended wrench to stop them from rotating."
And, finally, another area says:
"CAUTION: The camshaft must be held stationary with an open-ended wrench or a suitable pair of locking pliers. Do not use the alignment tool to
hold the camshaft in positoin or damage to the camshaft may occur. "
The only problem I have is WHERE the f**k do I apply the open-ended spanner to stop the camshaft from rotating?? It says "by the
hexagon", but what does this mean? I can't seem to find any area that fits that description.
Any help from some of you Zetec gurus?
Thanks,
Shaun
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zzr1100rick
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| posted on 28/10/06 at 09:56 PM |
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Hi either use an open ended spanner on where the cam sensor lugs are or better still make a ( v) shaped tool with two long bolts in it to go through
the holes in the cam sprocket tthen hold the tool and undo the cam bolt hope this makes sence
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stevec
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| posted on 28/10/06 at 09:57 PM |
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On the cam between the lobes near the front.
Theres a hexagon there about 22mm
[Edited on 28/10/06 by stevec]
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smdl
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| posted on 28/10/06 at 10:12 PM |
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That was quick -- thanks very much!
Looking closely at the cams themselves, I do see a half-hex shape on the bottom of the cams (when at TDC). I'm assuming that this is what they
mean? If so, I need a larger spanner as the largest I have (27mm) is still too small. I do also have an adjustable spanner, but it is too large to
go in there.
ZZR1100rick, I was able to take the exhaust pulley off by putting a wrench through the pulley and levering against the head to provide resistance, but
I can't do this on the inlet side, as the VCT crap gets in the way. Haven't tried anything near the cam position sensor, as it looks too
fragile there.
Thanks, gents.
Shaun
[Edited on 28/10/06 by smdl]
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stevec
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| posted on 28/10/06 at 10:30 PM |
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Brain is fading, spanner is 28 or 29 mm
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smdl
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| posted on 28/10/06 at 11:55 PM |
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No problem -- I got it finally using the "locking pliers" solution. Those bolts are TIGHT!
Now I have found that the bolt for the VCT pulley is larger than the standard one, so I have to drill out the vernier pulley to make it fit. That
goes along with shortening the bolt by .550". Then I have to sort out the fact that the ST170 intake cam has some static advance on it from the
factory.
No one ever said that this would be easy... 
Cheers,
Shaun
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Dusty
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| posted on 29/10/06 at 12:44 PM |
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I may not be getting it right but as the standard zetec cam sprockets are not keyed (? the same with the ST170) you don't have to use a vernier.
I don't understand why you would want to disable the variable cam timing.
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MikeRJ
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| posted on 29/10/06 at 02:48 PM |
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quote:
Originally posted by Dusty
I may not be getting it right but as the standard zetec cam sprockets are not keyed (? the same with the ST170) you don't have to use a vernier.
I don't understand why you would want to disable the variable cam timing.
Perhpas he's not using the Ford ECU, but using carbs or an aftermarket ECU system?
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smdl
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| posted on 29/10/06 at 04:19 PM |
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That's right...
I am using GSXR1000 throttle bodies and Megasquirt. I like the individual carb/TB look, and the variable inlet manifold conflicted with the
chassis.
Also, as no one (outside of Ford engineering) seems to know much about how the VCT is managed, I decided to disable it and to install vernier
sprockets to allow static cam timing adjustment.
Dave Bailey, a member of this group, is making an admirable effort to maintain the full functionality of the ST170 through the use of a Pectel ECU. I
wish I could do this, but I am on a tight deadline and can't invest the time -- not to mention the money.
I am saving all of the parts, however, and could put everything back in place at a later date if I figure out the VCT stuff.
We'll see how it goes.
Thanks again for the help,
Shaun
Edit: Dusty, I also realize that the vernier sprockets are not completely necessary, but they will facilitate simple adjustment for tuning purposes
down the road.
[Edited on 29/10/06 by smdl]
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