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Once Kevin got me on the right track a week or so ago, I was able to set the Left head cam phasing perfectly in about 5 minutes. 7 links, 113mm from tit to tit, cam profile tool fit/matched perfectly.
Went to do the Right head cam phasing yesterday and finally gave up after about 3.5 hours. No matter what I did it "appeared" to be a half link off. I removed the cams and started over so many times that I lost count. I'd set/mark the chain with a black Sharpie using calipers set to 113mm and make sure that I had 7 outer links. Place the cams into the chain with the **** pointing at the marked links, and then place the assembly in the head. I'd re-verify the 113mm from tit to tit, and that the marked links we still correct, and all would look great. Then I'd check with the 1-4 (Right) cylinder cam profile tool, and it would be off a half link. Or at least appeared to me that it was a half link. The profile tool certainly did NOT lay as perfectly on the cams as it did on the Left head cams. I'm very concerned as I don't want to screw anything up. Help.
Once Kevin got me on the right track a week or so ago, I was able to set the Left head cam phasing perfectly in about 5 minutes. 7 links, 113mm from tit to tit, cam profile tool fit/matched perfectly.
Went to do the Right head cam phasing yesterday and finally gave up after about 3.5 hours. No matter what I did it "appeared" to be a half link off. I removed the cams and started over so many times that I lost count. I'd set/mark the chain with a black Sharpie using calipers set to 113mm and make sure that I had 7 outer links. Place the cams into the chain with the **** pointing at the marked links, and then place the assembly in the head. I'd re-verify the 113mm from tit to tit, and that the marked links we still correct, and all would look great. Then I'd check with the 1-4 (Right) cylinder cam profile tool, and it would be off a half link. Or at least appeared to me that it was a half link. The profile tool certainly did NOT lay as perfectly on the cams as it did on the Left head cams. I'm very concerned as I don't want to screw anything up. Help.
Chris, your photo shows tool# 9226/4, but your signature says '89 S4. According to WSM the 9226 tools are for '85-86, and the S4 requires a different tool-- 9248. Each of those comes with two templates, one for each bank.
See the dimensions on pg. 15-127 of the WSM, that is what I have used.
Chris, as Jim Corenman say there are different lobe separation angles for different cams (106,5, 114 and 118 degrees). You have to have the right tool for the cams you are using. Another way is to use a degree wheel and a dial indicator and check the opening and closing timing at 1mm of lift on all four cams.
See page 124 and 124a:http://www.ligeti.com/928/Porsche%20...Volume%201.pdf http://dsportmag.com/the-tech/why-an...mal-headaches/
Åke
I've used that tool for a 91 and 90 and when I did it the cams were simply laid down in the- not pressed into the head. I verified the points in the casting pointed to the colored links and the number of links was 7 (from my memory). My memory is that the extrusions pointed almost straight up look at the picture below.
Here's a picture of one of mine. Cannot tell which head. Sorry.
Count links however you want, just make it look like the picture. WSM says "7 outer links of the chain". That's a bit confusing, but the picture is correct (as is Kevins).
If you number the links left to right, starting with #1 for the link aligned with the mark on the left side, then the mark on the right side needs to point to link #7.
But however you count links, just make it look like the picture and double-check the 113mm dimension.
Thanks all, but as stated in my original post, my issue is that I have set it exactly per the WSM, and re-verified multiple times, yet the profile tool is reflecting "to me" that somehow it's a half link off. I have tried to change one tooth on the sprocket in either direction one at a time on both cams and this is the best/closest. Still looks a half link off. I will go reread the info on the tooling in the WSM regarding the profile tools. I believe that 928 Motorsports as well as ArnWorx's websites show one part number for all years of 32 valves. The 9226 base number and -3 and -4 for the LT and Rt sides.
I haven't seen the 9248 info, but when I get home from work I will read further into the WSM. Thanks Jim.
Your excursions are pointing differently than mine. They need to point at 12 o'clock, then get the number of links right.
From the photo you provided it does look like there are 7 links from point to point. More like 5. Please confirm.
Nope I have 7 "outer" links, and 113mm from the bump/tit or whatever it's called on each cam. Exactly per the WSM. However at this point the profile tool does not match correctly.
Per 928 Motorsport's procedure for their brand of profile tools, it shows a "half link" off.
Count links however you want, just make it look like the picture. WSM says "7 outer links of the chain". That's a bit confusing, but the picture is correct (as is Kevins).
If you number the links left to right, starting with #1 for the link aligned with the mark on the left side, then the mark on the right side needs to point to link #7.
But however you count links, just make it look like the picture and double-check the 113mm dimension.
Jim that is the page I am going by in the WSM. All dimensions, etc.. are correct, but the profile tool doesn't reflect that. I'm going to have to look further at the 9248 tool. Thanks for mentioning that.
A couple more crummy pics. I needed another person to help with camera duties, but no one wanted to get near the garage once they heard all the cussing. One shows (kind of) the points on the cams and you can see the outer links is 7 with the marked links directly over the points.
The other pic is supposed to show the 113mm measurement from cam point to cam point, which it was on the money.
... I believe that 928 Motorsports as well as ArnWorx's websites show one part number for all years of 32 valves.
That may be what they show, but that cannot be correct. Four different cam sets were used with 32v engines: '85-86 S3, '87-91 S4, '89-91 GT, and '92-95 GTS. All different. The 9226 tool set was made for the S3 cam profile, LSA (lobe separation angle) for those cams was 114 deg. The LSA for the S4 is 106, so the tool is going to be off some-- about 4 cam degrees. (The pic on the Arnnworx site is an S3 head, fits perfect).
I'm in the "waste of time and money" camp on this one: If you can count to seven and use a caliper then why bother? The only possible error is that the "bumps" on some cams can be a bit ambiguous, but not the S4 cams IIRC.
Edit: Never mind, you posted the perfect picture. Looks good!
If the noses are at 113mm as per your photo and the crank is at 45 BTDC [agreed?] then I fail to see how you can be out.
As has been said earlier the 9226 tool is for the S3 cams with a larger LSA. If you visit the 928 Motorsports website and look up their tool for doing this they use a single tool with a different profile for each bank and tell you it is close but not a "perfect fit" depending on the cam spec type.
The Porsche manual specifies the 9226 tool for the earlier 32 valve cams and shows it in use. They mention the 9224 tool but I did not see any photos of it in use. It talks about the camshaft adjustment gauges for the 87 on models being discontinued.
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S4 Cam Phasing Connundrum-RT Head
