Beiträge von fishhead

Hi Micha, thanks for your quick reply and confirmation what I had suspected. As in addition the engine shows massive carbon built-up on the intake valves, it will take a complete overhaul including the timing chain and tensioner. Likely there will be some carbon on the piston rings as well, so it will need to be soaked with some solvent.

Greets Dirk

Hi folks,
as an owner of a Renault Megane 3 (Model 2013, H5F400, 180.000 km) I came across the article "The Hidden Cause Behind Failing Timing Chains"
(https://www.diagnosedan.com/de/the-hidden-…-timing-chains/)
Especially the extract from DD-5955 on the crankshaft/camshaft ratio captured with the scope caught my interest.
So I replicated this capture with my H5F400 and you can see the identical 7 crankshaft pulses from the gap til the next edge of the inlet camshaft signal.
Is anyone familiar with the signals of a fresh timing chain, or does my timing chain need replacement asap ?

I sent an email to diagnosedan.com but never received an answer, they are clearly not interestest in inquiries from hobbyists.

The crankshaft seems to be divided by 60 teeth with 2 missing for the gap, so one pulse to the next one would be equivalent to 6°.
If 7 crankshaft pulses like in my picture already defines a worn out chain, how many pulses will I count for a freshly mounted timing chain ?