hashim1995

Thanks for you reply, I do have wis but it’s not always clear about instructions. I did take the Engine out and disassemble it completely and did mark on chains and gears but still not sure if I'm doing the timing correctly. WIS says to rotate crank to 53 degrees but mines has only 40 degrees so I had to count but still whenever I turn the crank to 40 or 53 the cylinder 1 or 5 will not reach its top dead Center ? I just don’t understand. Everything is easy except setting the timing ? Any advice will help !

arsupisemnet

Your motor is dead. Based on what i see. It is going to smoke and through misfire check engine. It has to be sleeved with new pistons.

arsupisemnet

Check for the second set of labels on the back of your harmonic balancer

Brown guy BA

Hi everybody sorry for get out of context...but I'm working on a 2014 glk 450 v8 twin turbo mice eat the wires from knock sensors and the idea that I have at the moment was to drop engine to take care of problem...the intake have to came out...thru the bottom I barely see the wires and I don't feel confident on fix wires like that so I drop the engine...anybody think that removing the intake without dropping engine w as better idea??

arsupisemnet

Knock sensors and wiring located on the top of the engine in between under intake and intercooler.
It is up to you, you can either drop engine or take plastic firewall off and take your intake out.

GL450Estonia

Hi! I´am doing a m278 rebuild. I have a question what would happen if i use original pistons (If i don´t do the performance coating) with Mahle 41930CP piston rings in cast iron sleeves?

In this video they put original piston into cast iron sleeves :

BlownV8

Aluminum piston in an aluminum bore requires a coating on the piston or bore since you have to run dissimilar metals. Aluminum piston in an iron bore does not require a coating.