MainePorsche

Kevin,
What part of the world you located in ?

kevin2012

Hong kong. Difficult to get a 928 Indy here so for difficult job, dealer is the only choice.

MainePorsche

Wow.
When I asked what part of the world you're in, I was considering New England vs. the Southwest etc...

Join Rennlist so you can post pics that may help us help you. I don't know if you are considering working on the car yourself, but even if you're not this is the place to get the best guidance when confronting the dealership.

Best Wishes to you and yours.
Craig

kevin2012

I think that I was checking on the right thing on my 1991 S4

Is this the T-belt tensioner?


Is this the wire go into the T-belt tensioner for the warning light?


Thanks

MainePorsche

Correct on both.

docmirror

No it isn't. Get the manuals, buy some tools and dig in. Others have done it, so can you. The service you get at the dealer(even in HK) will not be suitable to the 928.

The valve timing system on the 928 has: 1 toothed belt, three toothed sprockets(gears, wheels), an idler, an oil pulley toothed gear, a water pump pulley, a hyd tensioner, four cams, two chains, and two hydraulic chain tensioners.

The parts replaced are all associated with the belt, and belt drive system on the timing. Its my guess that the timing 'chains' and sprockets under the cam cover have not been worked on. The are not a high failure item.

Order the PorKentioner from 928sRus, he ships internationally all the time. Remove the right side dist cap, and belt cover and test your timing belt tension. While the cover is off, visually inspect the teeth of the belt under a high intensity light. look carefully for cracks at the edge of the teeth. Look on the under side of the timing gears on each bank of the cams for wear. The shop has said they replaced them, it's best to check this carefully, they should show very little wear. Inspect the tensioner system for leaks, and repair/replace as necessary.

Put the cover and dist back on and start the car. Wait 5 minutes and see if there is another tension alarm. If not, go drive for a while, but plan a timing belt replacement soon. If there are more alarms, investigate the wiring at the CE panel which supports the alarm circuit. We will help you with the location of the wiring.

MainePorsche

Use this link to help you identify things. Also has The PN's (Part Numbers)

http://www.porsche.com/all/media/pdf...91_KATALOG.pdf

kevin2012

Are those nipples for oiling the tensioner? Fill in the lower one until the upper one leak out? or the other way around?
Thks.

MainePorsche

The fill is on the left. The bleed is on the right. What are you considering to use ?

Add: View this - will be helpful.

http://members.rennlist.com/pirtle/tbelt.html

Landseer

Kevin,
For great pictures, go to www.dwaynesgarage.norcal928.org

Look for the write-up, near the bottom of his list of tutorials, for 87 timing belt and water pump.

Study this writeup and you will be fully conversant.


Chances are you will need belt retensioning, which you can do yourself with some gymnastics. But its best if possible to have a known-expert disassemble and review everything.

928 is a car that most dealers in the US won't touch because they are no longer trained / knowledgeable. Too risky and costly for them and you. Maybe its different in HK.

kevin2012

Thanks for everyone inputs, great info. Really help me figure it out and understand my situation much better.

"Remove the right side dist cap, and belt cover and test your timing belt tension. While the cover is off, visually inspect the teeth of the belt under a high intensity light. look carefully for cracks at the edge of the teeth. Look on the under side of the timing gears on each bank of the cams for wear." >>>Yes, I think I will do that at least to have a further investigation.

In order to do so, do I need to remove the coolant hoses and drain the coolant first?

Landseer

Its pretty tight on the S4 to check the tension, again review the Dwayne writeup

Be sure, no matter what, to disconnect the battery negative before working on the car.

MainePorsche

Yep. Drain from the radiator plug. Clearing the radiator will clear the upper hose(s). This will give you much better access to remove the distributor cap.
I've used the Kempf tool for years to measure tension on my belts. Go to 928Int'l or 928Rus .com to get yourself one. It's inexpensive.

kevin2012

Will order the Kempf tool today and check the t belt tension porperly as a start. Thks.

docmirror

You don't need to remove the coolant hose to inspect and tension the belt on the right side, but it does make it easier to access.