stonecreek

I was the owner of a 944 S2 untill the cam shaft timing CHAIN broke. Needless to say that was a mess I ended up selling the car and got a 86 944 turbo. I am now looking at a 928 S4, whats the deal with the CHAIN. I was all over changing the timing belt and rollers and water pump and the damn CHAIN broke. Is this a common problem, how often do they need to be adjuster/looked at? My 944 S2 had 175000 miles on it.

thanks bob

andy-gts

I asked a well repected 928 mechanic and he said he would routinely change between 100 and 125K but he admitted he has only seen one give it up in 20 years.
andy

Mrmerlin

Hey BOB the timing chains should be replaced at about 100K and the tensioners and wear pads should also be inspected and replaced if either parts look suspect.
If you got 175K out of your 4 banger thats a long time in service..
Of course if your wanting something with more dispalcment and capable of Hi miles without worry of a timing chain breaking, you could always buy a 928 with 16 valve heads and super charger

mark kibort

the chain should last as long as the engine. I did have the original S4 engine, and it was sheding sprocket teeth, but the belt was fine. I ended up putting the 968 racing chains on it.
75 race days later, that combo is working fine!
mk

Bill Ball

Egad! I'm almost 100K miles overdue!

hacker-pschorr

Here we go again......

Sure the chain should last the life of the motor. Assuming the plastic guides it rides on do not wear out (and they do). Once they are gone you have metal on metal.

Mike Frye

Which, of course, turns your cam into a chain-saw.

Mrmerlin

Probably a good chance your chain was bad thats why the teeth were coming off..
\
The cam chains are just like motorcycle chains . Though the links may all still be connected the chain itself will stretch, this isnt something that is easily viewed, the only way is to fit a new sprocket and see how much play there is or measure over a distance of link pins . But this measurment must be compared to a new chain. You can also verify this by looking at the old sprockets if the teeth look slightly thinnerr than your chain is worn/stretched

Jim bailey - 928 International

RPM is what matters not over all miles since MOST 928s spend much of their time under 3,000 RPM , often well under , the chains tend to last a very long time.

Sailmed

Not when I'm driving

Jim bailey - 928 International

Mike shift into 5 th gear sometimes !

Jfrahm

yes the S2 valvetrain is under more stress and seems to need pads sooner than a 928. Less heat, I would imagine, in a 5.0L 928 making 160-ish HP per head also, compared to the S2 making 208. The S2 I think also uses stiffer valvesprings and the S2 valvetrain is subject to more rapid changes in RPM, generally speaking.

A 928 used on the street, I would hope the pads last to 180k or more but I'd be inclined to change them sooner. Since the valve cover doughnuts might be leaking and the covers themselves in need of refinishing it's probably a good idea to sort them all out anytime past 100k or so.

-Joel.

worf928

My $0.928:

Street car: No later than 150k miles for pad and chain replacement. I've eyeballed three sets of 125k-mile pads and chains. The pads were less or much less than 50% worn. If your pulling the cam covers at 100k+ you might as well replace them. But, IMO, there's no reason to pull the cam covers just to replace the pads and chains unless you're in the 150k range.

Sailmed

That when the rev limiter kicks in at 146mph in the 86.5
Or so I'm told.

Leon Speed

So how does one go about to change the cam chain without special tool 9248?