Camshaft / injection pump timing

[aramsay]

For a 1970 280SL.........

Just about ready to start up the engine after the head was off for some new valve guides, and set of new valve seals.

Since the workshop book we are working from is pretty poor, and our job doesn't exactly follow other Forum Threads,
I would like some confirmation we have the timing correct....

Neither the fuel injection unit nor distributor were removed / disturbed.

The chain was replaced by normal, feed-round method.

With no.1 camshaft lobes pointing up (firing), the camshaft & pillar marks lining up, the crank at TDC and the rotor-arm pointing
at the slot on the edge of the distributor-body......is this correct timing ?

One thing that threw us was the fact the inj.pump pipes are ordered (front of engine to back) no.6 > no.1........

 

[ctaylor738]

Just be sure to fill the little pocket in the head where the chain tensioner sits with oil, and prise the tensioner into full tension.  Then you should be good to go.

[ja17]

The problem is that you do not know if the injection pump is still in time. It might have stayed in time with the distributor, if it was correct and left hooked up. The injection pump can be 180  degrees out of sync.

[Benz Dr.]

True, but then wouldn't the distributor tell you that if nothing had been moved?

[ja17]

OK, you installed a new timing chain loose with the head and camshaft off.  As long as the distributor and IP did not get out of sync while installing the new chain, all should be well. The special bolt on the side of the block keeps the timing chain from slipping on the large IP sprocket. As long as this bolt was left in place during your installation, everything should have stayed in sync.

[ctaylor738]

Hmm.  I read it to mean that the chain was installed with the cam sprocket in place.