560sel new timing chain stuck - PeachParts Mercedes-Benz Forum

johnlo · #1 10-15-2006, 05:49 PM

putting in a new timming chain the pindelski way chain got crimped on the rail and jumped, now you can't turn the moptor at the crank. what happen? how do you fix it?

Tomguy · #2 10-15-2006, 07:17 PM

Your valves have run into the pistons. Turn the crank backwards and sync the crank and cam back, and continue to roll it in.

johnlo · #3 10-15-2006, 08:22 PM

thanks tomguy know how do you do that? as i said before i don't know much on these things i was lucky to marry into a mechanic family but mercedes have them stumped. but i appreciate your help.

johnlo · #4 10-15-2006, 08:33 PM

thanks tomguy now how do yo re-insync them? i don't know much at all my inlaws know alot but not on mercedes

MikeTangas · #5 10-16-2006, 12:57 AM

I had this happen, luckily I caught it early. I turned the crank slightly in the other direction then carefully "milked" the chain back over the driver's side cam then the passenger side cam. I may have also had to roll the passenger side cam back one tooth, but can't recall for sure as it has been a few years now.

Both ends of the chain have to stay in contact with the passenger side cam, especially when working solo. Tom Pindelski likes to use vise grips, I prefer zip ties. I started using zip ties after having the chain jump on me.

david s poole · #6 10-16-2006, 09:37 AM

this is a complicated[read need to take care] job when done in a shop.there is a now very common tool that is used to remove the rocker arms.unless you know exactly what jumped and by how much i suggest that you remove the rocker arms[some will not move until you roll engine around a little]until they are all out[i'm assuming that you already removed the spark plugs] now you can roll in the chain and then set it up on tdc and find the jump and correct it.unless you have done this job with someone else first i don't think it's a diy.

Strife · #7 10-16-2006, 12:22 PM

Quote:

Originally Posted by david s poole

this is a complicated[read need to take care] job when done in a shop.there is a now very common tool that is used to remove the rocker arms.unless you know exactly what jumped and by how much i suggest that you remove the rocker arms[some will not move until you roll engine around a little]until they are all out[i'm assuming that you already removed the spark plugs] now you can roll in the chain and then set it up on tdc and find the jump and correct it.unless you have done this job with someone else first i don't think it's a diy.

I agree 100% with this, I think leaving the RH (passenger) rockers in at all during this procedure is risky, and getting them out now is also going to be tricky.

I used a "cap" that bolts over the chain so I can't slip up. One good thing about having the right (and I know they cost $$$) tools is that they not only make the job faster, but safer, IMO.

Tomguy · #8 10-16-2006, 03:09 PM

Unlike David and Strife, I disagree 100% with the percieved need to remove the rocker arms. Yes, it may become an issue if your chain skips a link; however, if you simply roll back the engine while keeping the cam in the same place, and moving a link back, then you will be fine. I rolled my timing chain in (by myself) in slightly over an hour including all the pictures I took for my DIY article. You do NEED to secure the new chain to the cam sprocket via vise-grips or cable ties. I prefer vise-grips, others prefer cable ties (as Mike said).

david s poole · #9 10-16-2006, 03:22 PM

once you have seen and or helped someone else do the job so that you understand what needs to be done when,and why sure it's easy.for this job someone needs to make a video with explanations or more people are going to wind up in a jam[literally].

johnlo · #10 10-16-2006, 08:15 PM

so when you roll thje crank back does the chain need to be on the cam sproket? do i rolll it back until tension returns?

ctaylor738 · #11 10-16-2006, 10:27 PM

Mark the chain and the right sprocket with paint so you know where you are. You should be able to lift the chain off the right sprocket and pull it tight against the left sprocket. With it tight, turn the engine CCW until you can get the chain on the right sprocket one tooth back. Then see if you can go forward. Once you get the chain in, be sure to check the assembly marks on the cam thrust washer against TDC on the balancer.