Thread: Until NOW !!!....TD5 ValveTiming ...

Have you checked as to how this relates to the correct position as in Rave, which is set by pins in the flywheel and camshaft sprocket?

I think you have to careful as a valve could strike a piston easily.
Regard sPhilip A

Hello,
Yes did lots of research and reading the RAVE manual, Basically the pin is in the flywheel and pin in the top camshaft. I removed the top pin and looked in the hole. You could clearly see that the groove in the cam shaft was not in line with the hole despite the pin fitting in, I measured it to make sure the pin was at the bottom, I moved the camshaft so it was perfectly in line with the hole then about a 1 mm further if that. Still have the hesitation, but also the driver demand so still looks like the TPS has a dead spot just on or after movement. Thank you for you thoughts
Ian

Can this also help to improve fuel econonmy?

From rave

Valve timing
Inlet valves:
Opens 14° BTDC
Closes 33° ABDC
Exhaust valves:
Opens 57° BBDC
Closes 14° ATDC

Has anyone actually checked valve timing using degree wheel etc?
Regards

Hello,
This is one sites I found and others said the same that the timing is done more for the emissions than performance, most likely I am wrong, but that what a lot of sites said. I would think every engine might be a bit different, here is the link to what I read
AutoSpeed - Big Changes from Tiny Adjustments!

I didn't move the gear very much but it is really going well. Can not comment of economy but wouldn't move it to much other wise as one post said here things could go very wrong. It would quite hard to see the valve openings if you had a degree wheel.
I still have give it that wash and polish, flying out on Sunday so not sure I will have time.
Ian

I just read the link and the writer points out that the slotted adjustment "must be safe without causing contact of valves and pistons".......his was adjusted right to one end with no original problems before new belt.
Firstly, I am no mechanic, and I have not done any research and have no experience with this issue, but my logic tells me if those slots are for fine tuning the cam, that statement must have a degree of truth because otherwise a loose adjustment would be catastrophic.
Putting the belt one tooth out or more is obviously much more of a rotation than the small adjustment go the slots.

I'm sure someone who is a mechanic, or who has actually checked this out will confirm one way or another, and I hope they do because I'd like to play around a bit myself but not until I understand the consequences, preferably without crash and bang
Food for thought though isn't it
Cheers
Kev

Worn cam chain and gears will cause retarded valve timing. If your cam timing was set correctly from new and many miles later adjustment makes a noticeable performance difference it is time to replace the cam chain and gears. One tooth out will not usually cause any valve to piston contact, but it will run like crap. A degree wheel is probably the only way to set cam timing correctly with worn components.

Rick

Old Alfas have alignment marks on the camshafts and bearing caps and the sprockets are meant to be adjusted as the timing chain and sprockets wear.