would small amounts of chain stretch on a 603 cause an advance or retard of the fuel injection timing?

Retarded.

__________________
Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References

Did somebody call my name?

reason im asking is related to crappy starting characteristics many people seem to share with the 603 engine.i remember the older vw diesels had a manual timing advance lever for cold starts which would advance timing by 2 deg .this made all the difference eliminating bumpy smokey starts.its amazing what a few degrees of injection can mean to starting a diesel.im wondering if a few degrees of chain stretch can have an equally profound negative effect on starting.ive checked everything on my 603 injector spray glow plugs all see m to check out ok but still the crappy starting.im going to have a look at the timing chain asap .

michael,

But the IP timing is retarded by only 1/2 the amount that the camshaft is retarded by the elongation (timing chains do not stretch) of the timing chain.

So if the degrees on the vib damper show the cam to be 3 degrees late, the IP will be only 1.5 degrees late and you can correct that by timing the IP.

P E H

can this pump be timed easily without additional tools?

michael,

You should have a "drip tube". It can be purchased or made from a piece of IP to injector pipe.

P E H

Umm, does the 'drip tube' work on an OM603?

JimH,

The drip tube can be used on any MB engine with a mechanical fuel pump. What it does is tell you the exact position of the IP. This position is then set to a predetermined position of the crankshaft by rotating the IP to time the fuel injection.

The predetermined position is something like 24* ADC. This 24* is a reference point, not the actual timing when the fuel is injected.

P E H

I guess I should have asked if the drip works on an OM603, which has no primer pump to build pressure. Does the fuel pump produce enough pressure for this?

I din't mean to sound like a smart**s, I thought there was a different method for OM603.

I found this thread helpful...
Drip timing ??

The electronic timing/testing gear seems to be the 'hot' setup, adjust the timing with the engine running. It's just not likely to show up at my house anytime soon.

Best Regards,
Jim

JimH,

You need pracrically no pressure to use the drip tube. You can rig up a fuel gravity flow can above the IP.

P E H