Sounds like a reasonable conclusion based on experience , Pete .So maybe there is a pattern here? Maybe the M3 tensioner is good upgrade for an engine with a few kms under its belt but for new engines its best to stick to OE?
It's considered an upgrade for reliability.Additionally, can someone shortly try to explain why there is a need to upgrade to OE tensioner at all??? Is it a known problem and fails more often than not? Why?
Sorry if my explanation was a bit vague. I didn't mean the diaphragm stores oil pressure.I am somewhat doubtful that the diaphragm actually stores oil pressure for cold start ups.
That makes sense from what I gathered from the post mortum on my old tensionerSorry if my explanation was a bit vague. I didn't mean the diaphragm stores oil pressure.
I believe what it's for is that while there is oil pressure in the engine it displaces the diaphragm by filling the chamber with pressurised oil. If oil pressure decreases such as at shut-down, the diaphragm reacts by relaxing and consequently displacing oil which has nowhere to go other than acting as a force on the tensioner piston.
This probably is also a factor at start up when there is a volume of cold, thick (all be it without pressure) oil in there, which resists the piston being forced back by the chain guide.
I'm not sure if this is 100% correct but looking at how it's all put together and where oil goes in the system, it's what I suspect the case to be.