Pump timing on 603
Has the pump been off? What makes you think the pump timing is out?
Be aware that engine is only 110Hp when it was new. so it's never going to be a racer, don't be afraid to rev it, if it's an auto adjust the changes so it changes up a bit later, (you do this with the actuator on the side of the pump) loosen the 2 M6 bolts and tweak it clockwise/anticlockwise till the changes feel right. If it's a manual hold on to gears longer. This engine can't be driven on low down torque cos it aint got any.
Also check the sweep of your throttle linkage and make sure you're getting full throttle
Things to try without spending
Regards .... Gordon Diesel Oilsgerby
If your pump timing is out; your engine would be difficult to start and if it did, the exhaust would be smoky (black smoke).
I would check if you are getting full throttle initially. With the engine switched off get some one to depress the accelerator pedal fully to the floor, whilst this is being done you could observe how the travel translates on the injection pump. If the adjust is set right, there should be no travel left on the pump; if the pump's lever can travel more, this will need adjusting out.
More commonly omitted is the valve clearance check, check and adjust as necessary. If the valves are found to be tight, you can experience power loss and low fuel consumption return.
If you do not trust your garage I would suggest looking for a Bosch authorised dealer to do the job for you. You could try some commercial shop garage as opposed to normal garages, their labour rates are not usually a rip off. And these "boyzies" are used to working on "wiesels". 
How many miles has engine done. I have not studied posts and it is probably on there
My advice is slacken fuel pump bolts at frontx3 off
Just slacken them dont have them loose as oil will leak from pump o ring
Adjust pump to get fastest and smoothest running at idle and then its as good as it gets
Tighten pump screws x3 and check for any leaks
If your not happy take to be checked at a diesel specialist
100s of diesel pumps later this is the way i have set all my rebuilds
All have been pretty much dead on
Think of a petrol engine
Get t running smooth and then it goes a bit lumpy if you move distributor too much so knock back a tiny bit
If you are this far on you know what i mean
Diesel is the same just not as pronounced
Carefull listening to engine note and you will get as good as it gets. Not with a strobe light but just to hear engine note at its best
Its then as good as it gets if you know what to see and listen for
Any further tests will set it to standard and without proper kit you wont get it right as only sound can compensate for wear and chain stretch which alters timing of fuel pump
Have a play and try it, you wont hurt engine and when you achieve the best the engine is at its happiest and running at its optimum performance and efficiency
take note a little adjustment is a lot on a diesel on fuel distributor screw
g
https://m.youtube.com/?gl=GB#/watch?v=2DHD6UoALto
Try this. It maybe a 606 but the principal is the same.
Hi
Have you sorted the issue?
Timing chain stretch is a problem too but on your engine thats been well cared for it wear will be negligible
There is a plug on the side of the pump to lock pump for removal and fitting
If crank pulley is spot on the marks this should line up perfectly
Look on the net for some pics as it will be easier than writing one of my long essays
I would say my om603 engine got going well about 3250 revs up
Below this it was a plodder and my 606 is twice as good even though people say they dont have low down torque like the 603
Maybe im just lucky with the set up i run
Dont be affraid to rev it a bit as mine ave better fuel economy if revved a bit hard to get to speed
Jason gds will advise you on how a good one runs
His pulls better than my old 603 did even with everything new. Perhaps it was because i was a passenger and not driving myself
It always feels faster when someone else is in the driving seat
If you drive it like a modern turbo diesel, will appear gutless though I think it is a great bomb proof engine. As fast as I know mine untouched since leaving the factory pump wise. Does like being revved , probably a small puff of black smoke if you floor it after driving it with moderation? Hills knock them back but revs make up for it,. Have you got the emissions print out from the mot? Mine always below 1%.? Notice on a damp day, runs better .
Just thought if it reluctant to rev, might be the initial fuel filter located in the bottom of the tank. Unfortunately you need a special tool to remove this and you will be lucky if you can undo it as threads tend to go. You could try a temporary fuel supply to a Jerry can etc see if any improvement, it's only the cost of some 8 mm fuel hose.
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Hi, to my knowledge the pump has never been off. She is pretty slow, I know they are plodders, but she could be smoother and there is a bit of hesitation. She drives like she needs warming up even when she is hot if that makes sense? I have changed all the filters so just wanted to check the pump. My local 'specialist' wants a days labour to check the pump and valve timing, sounds too steep to me? Cheers Mud