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Old 04-03-2015, 05:35 PM   #1
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Camshaft Deviation

I finally got the chance to check my camshaft deviation on a 2000 Boxster S and found Cam 1 at -4.38 and cam 2 at -8.42 should I be worried what does this really mean?
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Old 04-03-2015, 05:44 PM   #2
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Deviation is out of spec. Usually worn chain ramps (plasticky guides that put tension on the cam chains). The Parts don't cost much but it's a labour intensive job. I Did mine last year when I dropped the engine. Mine were 5.x and 9.x ; much better now. I Can't say it changed the way the car runs. Maybe better gas mileage.
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Old 04-03-2015, 05:45 PM   #3
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Your CAM bank 2 is 2+ deg past manufacturer spec allowance.
Probably nothing serious just yet but unless you go in and change the vario
cam sliders this is going to get worse!!! Eventually the chain will eat through
what's left of the sliders and then it will get expensive! Not a bad job and it
can be done with the engine in the car :-)
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Old 04-03-2015, 07:19 PM   #4
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Do you guys know of a guide on how to change them with the engine in the car?

I'm sure redeye280z would like to see it.
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Old 04-03-2015, 07:42 PM   #5
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Wow wasn't expecting this should I be doing anything else if I go in and change the worn out sliders?
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Old 04-03-2015, 09:51 PM   #6
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Yes. Replacing the 4th and 5th timing chains.

One guide is in the Pelican Parts tech section:

Pelican Technical Article: Boxster Camshaft Upgrade / Chain Tensioner Replacement - 986 / 987

Not an easy job with the engine in the car.
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Old 04-04-2015, 06:43 AM   #7
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This is an interesting thread showing what can happen when one of the chain sliders in a M96 breaks. The relevant posts are #65 and 70. It doesn't end well. I find it disgusting that this part is made of plastic.

Dragged home one of these. - Rennlist Discussion Forums
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Old 04-04-2015, 08:30 AM   #8
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Quote:
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I find it disgusting that this part is made of plastic.
They are plastic on every car, even Ferraris.
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Old 04-04-2015, 08:38 AM   #9
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I just got a Durametric and mine are -3, -9. I'm glad to hear that this is a possible to do myself. Has anyone written a DIY guide on this?
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Old 04-04-2015, 09:22 AM   #10
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I just got a Durametric and mine are -3, -9. I'm glad to hear that this is a possible to do myself. Has anyone written a DIY guide on this?
Did you check it with the engine fully warm?
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Old 04-04-2015, 09:32 AM   #11
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Did you check it with the engine fully warm?
Fully warm as in a hard drive, not after a 5 minute drive while you wait for the coolant temp arrow to get to the 180. I have done that and got an artificially high reading that freaked me out.
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Old 04-04-2015, 04:09 PM   #12
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Well I drove around for 20-30 minutes, but not "hard", shifting at maybe 4000.

I just now changed the oil: after 5000 city/highway miles it was a beautiful clear brown with nothing in the filter or on the magnetic plug. The engine just turned over 80K (I think it is the original) - its hard for me to think that there is something majorly wrong...
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Old 04-04-2015, 04:22 PM   #13
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There are lots of instructions available but I'm not sure if there are specific "in car" how-tos. Having done the job with the engine out, I can't say as I would relish the prospect of doing the same job with the motor still in the car, especially for a first timer.
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Old 04-04-2015, 05:09 PM   #14
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While you're in there, consider changing out the variocam solenoids. Not that expensive and you'll have done most of the labor already.
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Old 04-04-2015, 05:40 PM   #15
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Quote:
Originally Posted by DG Boxster View Post
Well I drove around for 20-30 minutes, but not "hard", shifting at maybe 4000.

I just now changed the oil: after 5000 city/highway miles it was a beautiful clear brown with nothing in the filter or on the magnetic plug. The engine just turned over 80K (I think it is the original) - its hard for me to think that there is something majorly wrong...
I think 30 minutes is enough to get it fully warmed up so your measurements should be good.
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Old 04-05-2015, 11:59 AM   #16
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When fully warm as previously stated, would you typically expect the numbers to decrease or increase from cold readings? I mistakenly just warmed it up in the garage while idling and found the numbers to increase slightly from cold start readings.
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Old 04-05-2015, 12:26 PM   #17
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I've never checked them cold but when I check when the car is not fully warmed up the deviations are greater.
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Old 04-07-2015, 03:30 PM   #18
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Well I finally got a ride out of my new toy purchased in November and put to sleep immediately due to old man winter. I was able to warm it up completely as suggested previously and checked the deviation values after the ride and found both readings to drop approximately 1 degree bank 1 went from -5.54 to -4.45 bank 2 went .from -8.75 to -7.77 from the readings taken by warming it up in only in the driveway This was after 1/2 hour of light to moderate driving limited by frost heaves. Car ran great, I think I am going to monitor the readings for a while before I jump into anything.
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Old 04-07-2015, 03:39 PM   #19
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-7.7 is still beyond the limit... Personally I would not gamble on making them last until something happens.... I'm just sayin' and that's only my opinion!
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