Stupid Person

[messi]

There's a guy selling an Ls430 that has 145000 miles on it , I asked him when was the Cambelt changed? His reply, it doesn't have a Cambelt, it has a timing chain lol

[ColinBarber]

:iraqi-info-minister:

[brendangeorge]

There's a guy selling an Ls430 that has 145000 miles on it , I asked him when was the Cambelt changed? His reply, it doesn't have a Cambelt, it has a timing chain lol

Has he put a 460 engine in it? They have chains :)

Bren

[Malc]

Didn't realise the 460 had a chain, is it at all susceptible ? like cam chains can be in so many other marques ??

Malc

[messi]

:) he also thought my ls400 was chain driven too

[brendangeorge]

Didn't realise the 460 had a chain, is it at all susceptible ? like cam chains can be in so many other marques ??

Malc

It is designed to last the life of the engine so you have to follow the inspection regime - Toyota don't seem to make duff engines and unlike BMW don't put the chain at the back of the engine on some designs and so make it impossible to replace at a reasonable cost. Most people think chains are better than belts for normal engines.

Bren

[steve2006]

Before the advent of OHC ( Over Head Cam) engines most were chain driven as the chain lenght for OHV ( Over Head Valve) engines was a short run so problems with stretch and tensioners were mimimal.

With OHC engines there was a greater run of chain required and this is when problems arose with stretching and tensioners so most manufacturers moved to belt drive.

With improvements in construction the chain has made a comeback but it seems the tensioners are still failing. Sometimes a modified version sorts the problem but in some cases the chain, tensioners and sprockets need doing.

Failures are also associated with poor servicing regimes and the use of the incorrect type of oil.

[brendangeorge]

Before the advent of OHC ( Over Head Cam) engines most were chain driven as the chain lenght for OHV ( Over Head Valve) engines was a short run so problems with stretch and tensioners were mimimal.

With OHC engines there was a greater run of chain required and this is when problems arose with stretching and tensioners so most manufacturers moved to belt drive.

With improvements in construction the chain has made a comeback but it seems the tensioners are still failing. Sometimes a modified version sorts the problem but in some cases the chain, tensioners and sprockets need doing.

Failures are also associated with poor servicing regimes and the use of the incorrect type of oil.

I think another factor is modern engines are "overly square" (short stroke) which reduces the length of the chains, rods etc and allows high revs with reliability. This is one of the reasons a F1 engine can get to 18K RPM without blowing up.

Bren