Timing out on JTS - Alfa Romeo Forum
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(Post Link) post #1 of 5 Old 04-07-12 Thread Starter
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Timing out on JTS

My favourite specialist is doing my cambelt change and has just told me that the timing on my 156 JTS is out by maybe 4.5 degrees. No idea whether it was advanced or retarded, I'll ask on collection. This was done by an Alfa dealer before I bought the car, perhaps using TS camlocks. I know others have had similar experiences at belt change, albeit with different engines.

I have a very basic understanding of engines, and have never driven my car in any other condition, so what would I expect in terms of performance difference and behaviour?

I ask because I recently did a rolling road test in which it performed a little poorly but ultimately as expected for the average JTS.

Thoughts?
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I think it is pretty common to find the timing out before the belt has been changed.

A combination of not using the correct tools when it was last done, and some belt stretch will mean it is out slightly.

I have done 5 x TS belts and 4 of them had incorrect timing to start with..

Just because it was done before by an Alfa dealer of specialist doesn't automatically mean the correct locks have been used. The attitude "I know lots about these engines, I can do them without the locks" does seem to surface from time to time.

Giulietta 2.0JTDm (170), BMW 335i Cabrio, BMW 120d
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I figured belt stretch might play a part. That said, the belt is actually just under two years and 19k miles old, but the tensioners and some other parts were three years old and I wanted a bit more piece of mind.

I gather advanced timing would move power down the rev range, and retarded the opposite, but presumably there is also a point - before pistons hit valves - at which it is just plain running poorly.
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Member car:

Alfa 166

I've recently done a cambelt change on a 1.6 ts and the original timing was slightly out. Only fractionally. I put it down to belt stretchas the last time it was changed was by an alfa specialist.

I've done it myself and can see why you need the cam locks since the pulleys are not keyed to the cam. It's also a tight fit when putting the belt back on.

It runs ok and a little smoother once going but I think I need to now change a couple of the spark plugs or check the coils as one or two of them are on the way out.

The belts stretch with time and this usually accounts for slightly off timing. Personally I was just happy once I did it that it started and didn't shoot the valves out the block.
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(Post Link) post #5 of 5 Old 09-07-12 Thread Starter
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Cheers for the info. Having driven it a bit since, my feeling is there's not any noticeable power increase, but it's smoother. Could be the placebo effect or not having driven it for a bit, but it really feels a bit more composed and easy to rev.
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