I stumbled across a Helms remark on the lack of accuracy of the factory alignment marks, specifically on the 550 in this conversation. The '98 I finished timing the other day had the same result. Bank 1-6 was very close, Bank 7-12 was no where near (relatively speaking).
I remeasured 3 times to make sure my coat hanger was reading accurately as well. Are you finding the same thing with this engine?
I've always understood the marks to be assembly reference points and not reliable cam timing reference points.
I haven't seen it specific to the 550 either, TR, 355, 308 etc, It was convenient in this conversation.
A little off topic, but it brings me to the thought of how hard does one need to work to make owners realize these cars aren't perfect..let alone "right" out of the factory a lot of times.
Cam timing probably not right at initial assembly, alignments usually off from the factory, dealer detail shops offering wet sand and buff service before delivery... Talk about an unfinished product. Imagine the PDI expenses if dealers actually went through new cars and set them up before selling them...
How long do the cars see usage before all of these get addressed. A Ferrari is like a pair of sneakers, the more they wear in and get adjusted the better they feel...
Brian- Does that mean you are stuck with lock and swaps or do you just not accept that kind of work? I know that once you have made your own timing marks, you can lock and swap if everything lines up OK, but how about for the first time you change belts?
LOL! Don't worry David, I always try to stop just shy the point of diminishing return.Now Josh, don't you go getting any highfalutin ideas!
I'm not at that point yet, but have always put little faith in these marks. As the stakes are pretty high, I find multiple checks are always prudent. Brian's comment about Ray Charles making the marks was very funny! I did a Boxer engine recently where 3 of the 4 marks were very close to spot on the references; whereas the 4th, clearly Mr. Charges was called in. I just couldn't believe what the degree wheel was telling me versus the reference marks. But, as you know, once true TDC is verified, you can indeed trust what you read.I remeasured 3 times to make sure my coat hanger was reading accurately as well. Are you finding the same thing with this engine?
That's how it has been spelled out in the WSM...This 550M, my own car, ran exceptionally well. However, due to a pissing cam seal, hence cams coming out, I wanted to go through this exercise. On client cars, it depends...and my philosophy of when to degree, or not, mirrors that of Brian. In the 30 years that I've been serving these cars, you can get a pretty good idea of what's running right versus 'just pretty' if you catch my drift...I've always understood the marks to be assembly reference points and not reliable cam timing reference points.