tr4 Timing chain renewal

[Nick Brooks]

Hi there,

 

Does anyone know the recommended timing chain replacement interval for the 2138cc engine?

 

I remember the duplex chain on a saab I had, was recommended at 100,000 miles, but that seems a lot for a TR engine!

 

Thanks, Nick

[mike3md]

Nick,

 

I think it's more a question of examining the condition of the chain and sprockets to decide if they need replacement.

 

Mike

[AlanG]

You'll know when the tensioner wears out.

Alan.

[Nick Brooks]

Thanks Mike for your feedback. Yes of course that is the best way. I changed my timing chain at 25,000 miles when doing an engine rebuild. I notice that the Haynes manual suggests changing at 30,000 miles.

[mike3md]

Nick,

 

Oddly my (hardback) Haynes only has the same test of wear on the chain/sprockets as the WSM, i.e. that the chain should not be able to be pulled more than 0.4" (10mm) away from a straight edge between the sprockets. As Alan says, the tensioner needs to in good condition.

 

Mike

[mike3md]

Whoops, just found that the Haynes does indeed suggest replacing at 30,000 miles!

 

 

 

Not in the WSM though, and seems unduly cautious.

 

Mike

[Nick Brooks]

Hi Mike,

Yes I think it's rather cautious, I would have thought around 50,000 miles was more like it. Hunted around the Internet for opinions but to no avail. When I do come to replace it I notice that people are recommending Reynolds and German chains and tensioners and to avoid the Chinese products around.

Thanks for your thoughts,

Nick