|
|
SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS! |
Post Reply |
|
Thread Tools | Search this Thread |
10-24-2010, 08:08 PM | #23 |
Colonel
479
Rep 2,782
Posts
Drives: ESS/G-Power Z4M, VF Z4, 996tt
Join Date: Sep 2009
Location: Los Angeles
|
Do we know what build dates are affected? What's your build date sirmalloc?
|
Appreciate
0
|
10-24-2010, 08:35 PM | #26 | |
Brigadier General
218
Rep 4,726
Posts |
Quote:
New ones should be torx bolts, doesn't mean much though.
__________________
|
|
Appreciate
0
|
10-26-2010, 07:59 PM | #28 | |
Captain
42
Rep 632
Posts |
Quote:
I hope it's not needed to do this repair - just more things for them to potentially mess up...
__________________
|=.-._.-._.-._.-._.-._.-._.-._.-._.-._.-._.-.=| Silbergrau A08 / Sepang Brown LSD6 / Carbon Leather 4MY (1 of 3, this combo) RAC RG63 | Conti EC-DW | GC/Koni-Dinan | Rogue RSM | Arqray | Autosolutions | BMW brace | Pinnacle tint |
|
Appreciate
0
|
10-26-2010, 08:04 PM | #29 |
Brigadier General
218
Rep 4,726
Posts |
That's most likely, but shouldn't be necessary. The proper way is to loosen the vanos, use the solenoid to put the pistons into a position you can unscrew them, then retard then again so you can pull it out.
__________________
|
Appreciate
0
|
10-26-2010, 08:11 PM | #30 | |
Captain
42
Rep 632
Posts |
Quote:
BTW, is there one major symptom that is present with this issue? I'm a little unclear on that - seems like a substantial number of bolts could be entirely broken and you wouldn't know it.....true?
__________________
|=.-._.-._.-._.-._.-._.-._.-._.-._.-._.-._.-.=| Silbergrau A08 / Sepang Brown LSD6 / Carbon Leather 4MY (1 of 3, this combo) RAC RG63 | Conti EC-DW | GC/Koni-Dinan | Rogue RSM | Arqray | Autosolutions | BMW brace | Pinnacle tint |
|
Appreciate
0
|
10-26-2010, 08:17 PM | #31 | |
Brigadier General
218
Rep 4,726
Posts |
Quote:
But basically the bolts we are talking about bolt a metal disk which has splines on the inside to the camshaft. This is how the camshafts are spun. So when the bolts get loose there's going to be play there and it should make noise, and when they finally break nothing is spinning the camshafts anymore.
__________________
|
|
Appreciate
0
|
10-26-2010, 08:27 PM | #32 | |
Captain
42
Rep 632
Posts |
Quote:
Can the VANOS pistons be moved by hand? I thought I read that somehwere on all the recent forum activity on this subject.
__________________
|=.-._.-._.-._.-._.-._.-._.-._.-._.-._.-._.-.=| Silbergrau A08 / Sepang Brown LSD6 / Carbon Leather 4MY (1 of 3, this combo) RAC RG63 | Conti EC-DW | GC/Koni-Dinan | Rogue RSM | Arqray | Autosolutions | BMW brace | Pinnacle tint |
|
Appreciate
0
|
10-26-2010, 08:41 PM | #33 | |
Brigadier General
218
Rep 4,726
Posts |
Quote:
Pistons can't really be moved by hand.
__________________
|
|
Appreciate
0
|
10-26-2010, 08:48 PM | #34 | |
Captain
42
Rep 632
Posts |
Quote:
So, how do I go about finding an "S54 expert" in my area/region? I know there are guys by the name of Fletcher Made Horsepower that built engines for my friend that ran a Z4M in Koni and for Turner - should I be looking up a place like that?
__________________
|=.-._.-._.-._.-._.-._.-._.-._.-._.-._.-._.-.=| Silbergrau A08 / Sepang Brown LSD6 / Carbon Leather 4MY (1 of 3, this combo) RAC RG63 | Conti EC-DW | GC/Koni-Dinan | Rogue RSM | Arqray | Autosolutions | BMW brace | Pinnacle tint |
|
Appreciate
0
|
10-26-2010, 08:50 PM | #35 | |
Brigadier General
218
Rep 4,726
Posts |
Quote:
__________________
|
|
Appreciate
0
|
10-26-2010, 08:51 PM | #36 | |
Major
112
Rep 1,262
Posts |
Quote:
|
|
Appreciate
0
|
10-26-2010, 08:59 PM | #37 |
Brigadier General
218
Rep 4,726
Posts |
Ugh, I have the pictures I just didn't want to do it, I guess I will now. Hold on.
__________________
|
Appreciate
0
|
10-26-2010, 09:13 PM | #38 |
Brigadier General
218
Rep 4,726
Posts |
Ok, so where the red line is indicates the outer edge of the part I'm about to talk about. basically this piece is bolted to the camshaft and NOTHING else is bolted to it. The way it is in that picture you can actually pull off the timing gears/timing chains without unbolting anything else.
Now the green circle is splined on the inside, it's part of the piece bolted to the camshaft. There is a splined shaft that goes into this and is the only thing that turns the camshaft. So when the bolts break that piece circled in red just starts spinning instead of the actual camshaft. When they are loose its going to rotate forward and back a little and eventually cut into the bolts like we have seen. And yes they cannot come out completely because there is a thrust washer there. You can see the splined shafts that go into the camshaft as well as what spins them. what spins the splined shaft bolts to the outer bolts in the upper picture. The second set of splines though are helical, so when the shaft foes in and out it is forced to spin a little bit in relation to the timing gears, which is what creates the change in cam timing.
__________________
|
Appreciate
0
|
10-26-2010, 09:25 PM | #39 |
Captain
42
Rep 632
Posts |
Great diagrams and explanation. Huh, all along I thought the 6 allen bolts, the ones failing, were the bolts that physically connected the cam gear directly to the cam shaft. I have not come across a fully exploded diagram of all the parts involved, which is probably why I don't/didnt fully understand it. I thought that the 6 hex bolts held the VANOS hub to the cam gear some how and allowed for the variablilty in the cam timing as the helical gears were adjusted by the system. The helical gear portion does mesh with this hub part, correct?
__________________
|=.-._.-._.-._.-._.-._.-._.-._.-._.-._.-._.-.=| Silbergrau A08 / Sepang Brown LSD6 / Carbon Leather 4MY (1 of 3, this combo) RAC RG63 | Conti EC-DW | GC/Koni-Dinan | Rogue RSM | Arqray | Autosolutions | BMW brace | Pinnacle tint |
Appreciate
0
|
10-26-2010, 09:46 PM | #40 | |
Brigadier General
218
Rep 4,726
Posts |
Quote:
__________________
|
|
Appreciate
0
|
10-27-2010, 06:52 AM | #41 |
Captain
42
Rep 632
Posts |
My final thread-jack question, maybe it's a little pertinent to the OP questions. If the cams basically need to be retimed with this fix, is this a reasonable time to consider differnt cams for the car? I've read alot of debate on cams - looking for opinions as to whether or not they are even "worth it" for the stock S54.
Is it really that much more work to swap the cams at this point? With the engine management on mine, an '07, can CSL cams, for example, even be run at all, or do they require modification of the DME? I might have a fair deal on CSL cams so the thought crossed my mind. Wouldn't want to do it if it is a mod fraught with headaches or if the money is better spent elsewhere, but then again, there may not ever be as good a time to do cams as when having the cam bolts checked/replaced.....just throwing this out there for thoughts. Thanks again.
__________________
|=.-._.-._.-._.-._.-._.-._.-._.-._.-._.-._.-.=| Silbergrau A08 / Sepang Brown LSD6 / Carbon Leather 4MY (1 of 3, this combo) RAC RG63 | Conti EC-DW | GC/Koni-Dinan | Rogue RSM | Arqray | Autosolutions | BMW brace | Pinnacle tint Last edited by onebluemcm; 10-27-2010 at 07:02 AM.. |
Appreciate
0
|
10-27-2010, 08:56 AM | #42 | |
Brigadier General
218
Rep 4,726
Posts |
Quote:
__________________
|
|
Appreciate
0
|
10-27-2010, 09:14 AM | #43 |
Captain
42
Rep 632
Posts |
meh, perhaps there are other, easier and possibly better things to do - headers, etc..... Will have to give it some thought. Engine has to be raised to slide out the rods that the rocker arms pivot on - didn't think of that. Yeah, if not for that little part, wouldn't be too bad of a job. They recommend matching new rocker arms with new cams so you don't have unmatched wear patterns? In reality, is this an issue?
__________________
|=.-._.-._.-._.-._.-._.-._.-._.-._.-._.-._.-.=| Silbergrau A08 / Sepang Brown LSD6 / Carbon Leather 4MY (1 of 3, this combo) RAC RG63 | Conti EC-DW | GC/Koni-Dinan | Rogue RSM | Arqray | Autosolutions | BMW brace | Pinnacle tint |
Appreciate
0
|
10-27-2010, 09:40 AM | #44 | |
Brigadier General
218
Rep 4,726
Posts |
Quote:
__________________
|
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|