hi,
recently i have gone through the loss motion spring upgrades.

the engineer broke 4 screws (the black screws) when opening the engine trying to replace the loss motiong springs. On top of the screw were written number 12. those screws were later replace by another similar sized silver screws which on top of the screw were written number 10.

is it safe? how will it effect the engine?

valve timing was done manually, without any computer aids. the engineer used some sort of metal instruments that looks like a very thin plate to adjust the valve, and tighten the bolts.

is this how valve timing were done correctly?

its kinda bothers me that they are not using any computer to to the adjustments.

fuel consumption has increased a bit, engine feels tighter, less vibration and clicking sounds. 12.3km per litre, has dropped to 10.3km per litre.

do help...

 

The numbers should be grade markings... the higher the number, the stronger (but more brittle) the steel is. "Standard" bolts are 8.8

Shouldn't be any issues there.

What the tech was adjusting is the valve lash, not timing. Lash is the amount of free space between the rocker arm (screw) and the top of the valve. Some space is needed to allow for metal expansion when hot, too much means noise and that valves are not opened all the way.

Those thin metal plates are feeler gauges, they are precisely made pieces of metal of a specific thickness. The correct procedure is to loosen the jam nuts, then adjust the screw until the gap is in the specified range (a gauge that is at the top end will either not go in at all or just barely, and one at the bottom end will go in without resistance) and retighten the jam nut, then check to make sure it didn't readjust while tightening jam nut. There is no computer used to perform this adjustment in the field, the factory line has a VERY expensive robot to set this initially.

Tighter & quieter is the point of the lash adjustment. I expect that fuel consumption is a result of the battery being disconnected and computer (ECU) resetting... needs to relearn fuel maps. Also, it is possible that they flashed the ECU with a patch that corrects the fuel efficiency as reported by the dash, the factory program had incorrect, higher efficiency reported.

 

I would not worry about it. Those thin pieces of metal, are feeler gauges. It is the correct tool to adjust valves. Or it used to be anyway. Just pay attention to any extra noises you may hear. OF course, you will start hearing them now., Don't worry.

 

after two days of the upgrades and adjusted the valve lash as said by 'kbri', the noise from the engine has lessen. pickup seems to improve abit..

thanks for you helps guys! really appreciate it!