Factory branded timing belt?

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Originally Posted by INter674

Yes we found that many used d3 d4s were due for belt/s...so bought a petrol to avoid the reported belt/turbo/manifold issues

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Surely petrol engines need their timing belts changed too?

Imho there are no “issues” with regards to timing belts on any of the D3 or D4’s, they just need replacement every 7 years or 160,000km.

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Originally Posted by Eric SDV6SE

Surely petrol engines need their timing belts changed too?

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The Super Charged SCV6 has two timing chains, one for the left bank & one for the right bank. There is no scheduled service requirement to replace them.

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Originally Posted by kelvo

The Super Charged SCV6 has two timing chains, one for the left bank & one for the right bank. There is no scheduled service requirement to replace them.

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Three actually lol. One drives the jack shaft which then drives the balance shaft and cam chains from what I can see. Seems more complicated than I’d have expected but I’ll defer to their knowledge.

Correct the SCV6 has lots of chains☺ and there were some issues with early Ford based engines which were addressed by fitting upgraded timing chains. Chains have not been a problem with these engines since.

Certainly it's very nice not to have to shell out cash on belts..which leaves more money for petrol. ..which it likes very much😆

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Originally Posted by twr7cx

The rubber breaks down over years from the vapours and heat. Personally, I wouldn’t risk it with the front belt as it’s an interference engine so failing would result in fatal engine damage and significant expense and hassles. The delayed replacement could cost you big if it goes wrong. Regardless of kms, if it’s 7 years or older replace it.

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Years ago a brother bought an Alfa 90 that was overdue for a belt change. The belt broke while driving it home, bending every valve.

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Originally Posted by Eric SDV6SE

Surely petrol engines need their timing belts changed too?

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Yes, but only if they have a timing belt fitted. In Land Rover applications, most seem to use timing chains so don’t require interval changing like the timing belts.

Does anyone know why one (chains/belts) is chosen over the other when designing the engine?

Timing Belts are cheaper and quieter.

Timing Chains are more durable and last longer. But more expensive.

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Originally Posted by Dagilmo

Does anyone know why one (chains/belts) is chosen over the other when designing the engine?

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Belt is cheaper as mentioned. Belts are also quieter. Packaging can be a factor as well. A chain is narrower for the same strength.

You sometimes see both - chain for upper cams and belt timing it all to the bottom end.