Still pulling hair- Twin Cam timing marks. How accurate?
Posted: Sat Jun 14, 2008 7:50 pm
Thanks for all the suggestions and advice. Decided to check cam timing.
Workshop manual shows cam pulley timing marks set exactly opposite each other and dead in line with top of front cover.
Have tried moving a tooth on both cams to get everything in line as per the book, but careful and precise though I am, they will not line up like the illustration. The closest they get with bottom pulley on tdc, is about 5mm lower than the top of the front cover, when lined up with a straight edge.
Move a tooth so they line up straight at their outer markings and are also level with the top of the front cover, and the bottom pulley is about 5 degrees out; which suggests a tooth out.
I'm trying to do it without taking the bonnet off
Getting late and tired so have knocked off for now.
Is that illustration wholly accurate and should they be bang in line with the top of the front cover as well as each other, or is it right they do actually sit about 5mm below it.
Perhaps this is why it might have been done wrong originally.
The chain doesn't seem too stretched for the tensioner is less than half way in.
Thanks everyone,
Mark.
Workshop manual shows cam pulley timing marks set exactly opposite each other and dead in line with top of front cover.
Have tried moving a tooth on both cams to get everything in line as per the book, but careful and precise though I am, they will not line up like the illustration. The closest they get with bottom pulley on tdc, is about 5mm lower than the top of the front cover, when lined up with a straight edge.
Move a tooth so they line up straight at their outer markings and are also level with the top of the front cover, and the bottom pulley is about 5 degrees out; which suggests a tooth out.
I'm trying to do it without taking the bonnet off
Getting late and tired so have knocked off for now.
Is that illustration wholly accurate and should they be bang in line with the top of the front cover as well as each other, or is it right they do actually sit about 5mm below it.
Perhaps this is why it might have been done wrong originally.
The chain doesn't seem too stretched for the tensioner is less than half way in.
Thanks everyone,
Mark.