Chain Tensioner Guides!

karozza · **Posted:** Mon Jul 27, 2020 2:25 pm

A friend of mine just bought an Italian LHD S2 & although did the usual major service, did not replace the above(as did I). The engine was running smooth as can be, until he went to start up after a spirited drive with friends; the car would not start.

Turns out the chain tensioner cracked/disintegrated etc doing extensive damage to the head....to the tune of €6000 in parts alone :shock:

Apparently these are best replaced over time as well :roll:

Needless to say, both guides will be on order. Already have Top Cover rubber seal; any other suggestions?

Now the Top Cover will be removed, perfect time to have it powder coated. Would like to go for a kind of factory look with a silver & black Porsche lettering. Any suggestions on colour?

tr7v8 · **Posted:** Mon Jul 27, 2020 3:12 pm

A trashed 16V chain can write the engine off as not only does it damage the head irreparably, but can scrap the bores with bent valves. It is not just the tensioners but the chain needs changing as well. Typically at 100-120K miles

Wh1t3Kn1ght · **Posted:** Mon Jul 27, 2020 5:29 pm

tr7v8 wrote:

A trashed 16V chain can write the engine off as not only does it damage the head irreparably, but can scrap the bores with bent valves. It is not just the tensioners but the chain needs changing as well. Typically at 100-120K miles

Also need to inspect the teeth on the cams as well as if the chain has been loose for some time it can wear them out meaning new cams required...

karozza · **Posted:** Tue Jul 28, 2020 8:16 am

OK-chain included.

Not sure I know how to replace that :scratch:

tr7v8 · **Posted:** Tue Jul 28, 2020 8:50 am

karozza wrote:

OK-chain included.

Not sure I know how to replace that :scratch:

Cams out as the chain is endless.

Waylander · **Posted:** Tue Jul 28, 2020 8:54 am

Ah then the fun of retiming the cams

pauly · **Posted:** Tue Jul 28, 2020 9:45 am

When I was about to buy a 968 from him, an indy Porsche dealer showed me what he could buy 2 new cams for. It was about £300.

Waylander · **Posted:** Tue Jul 28, 2020 11:10 am

more like 2K these days

tr7v8 · **Posted:** Tue Jul 28, 2020 11:40 am

Waylander wrote:

more like 2K these days

Yup last Porsche price I saw was £750 a Cam! There was a company in the USA who could resprocket the cams.

karozza · **Posted:** Tue Jul 28, 2020 1:02 pm

Are there any tell tale signs to show if chain needs replacement?

tr7v8 · **Posted:** Tue Jul 28, 2020 3:25 pm

karozza wrote:

Are there any tell tale signs to show if chain needs replacement?

If the chain is allowed to wear significantly then the sprocket teeth on the cams "hook" as they wear. Unfortunately they are made as part of the cam so are not a replaceable part. The teeth should be symmetrical. If they aren't then it could get expensive.

Waylander · **Posted:** Tue Jul 28, 2020 6:25 pm

tr7v8 wrote:

Waylander wrote:

more like 2K these days

Yup last Porsche price I saw was £750 a Cam! There was a company in the USA who could resprocket the cams.

That’s web camshafts

I have instructions and diagram and parts to have an engineering shop machine the cams to weld new sprockets on, somewhere

Just looked in PET, cams are £729.00 each inc vat for an S2, 968 are £947.00 each inc vat

Chain is £32,

The slide rail repair kit is 944.105.949.00 £94 inc vat

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