Oil type and timing chain rattle on start-up

[san rensho]

Originally Posted by Jake Raby

Oil does impact tensioner rattle.. This is in part to the way oils will retain pressure in their tensors, as well as how well the boundary layer protection is able to buffer the sound of the chains.

Oils high in Moly love tensioners. The best oil to quieten tensioners has always been redline. Our latest generation of DT40 is the best its ever been for this, as well.

I tried Redline and as the french say, no diffrance.

[Jake Raby]

Originally Posted by san rensho

I tried Redline and as the french say, no diffrance.

Then you have a tensioner issue, or chain issue, or both. The IMS tensioner is the worst for this, and as it rattles it hammers on the IMS bearing, and it's tensioner paddle and wear pad. I think this contributes at least some to IMSB failure.

Its not a normal occurrence; just because most do it, doesn't make it mechanically acceptable. The tensioners for 5 chain engines have been revised 7 times, 3 chain have been revised 3 times.

If its rattling at start up, things are wearing. Period.

A huge amount of preventative packages we are doing these days end up getting chains, as most are stretched and send the tensioners out of range.