Pug 106 TUD5 diesel pump timing

Hello all

I'm in the process of replacing the head on a 106 - 1st time for me,
so please bear with me

Because of the way the engine failed, I was unable to get it to TDC
and fix all the sprockets so I'm having to do it after the event. This
brings me to the diesel pump...

Acording to the haynes manual, you put a pin through the hole in the
sprocket, through the hub, into the pump body to lock it. I'm OK with
this. The problem I have is that there seem to be 2 holes in the body
that a pin will go into (it's difficult to see the holes with the pump
in place). There is one at about 7 o'clock and another at 1 o'clock
looking from the sprocket end of the pump.

Am I missing something? Which one is it? Also, am I in danger of
being 1 revolution of the pump out, or is it one complete pump cycle
per revolution?

Could this also be the case with the camshaft and crankshaft
sprockets? Any help here would also be handy

Thanks for any help

Steven.

 

1 cycle per 2 revolutions so you can't be out 180deg.

 

Do you mean I CAN be out 180deg? Is there anything I can do to check
this? or do I have to just try it?

 

looking at the pump pulley, there are three bolts and two holes

the two holes (with one bolt between) are positioned to the right of centre,
the one o'clock hole is the one to use . So looking at all it in the right
place, from 12 o'clock going clockwise is pin in hole (1 o'clock), bolt (3
o'clock) , unused hole at just after 6.30 o'clock, bolt at 8 o'clock, bolt
at 10.30

you need the timing pin for the flywheel, and the camwheel too

mrcheerful

 

Thats great, thanks for the info Any advise on Duncanwood's post?
The pump needing 2 revolutions to complete 1 cycle..... How do I know
if I'm at the start or the middle of the cycle?

Thanks

Steven

 

it doesn't make any difference, the pump (and cam shaft) turns one turn for
every two of the crank. there is only one cam position one crank position
and one pump position. put them all together with the belt and it will
work.
(this is because the piston has to come to the top twice to complete one
'cycle' of the engine)

mrcheerful

 

No, the pump only turns once for every two engine revolutions so you can't
get that wrong.

 

Ahh the penny has dropped

Thanks for your help again

I'm sure I'll be back with more questions before it's done!

Steven

 

Thanks for the confirmation - Duncanwood just posted saying simmilar.

How far away from March in CAMBS are you? you may hear the whooping
if i get the thing to turn over & start

Steven

 

Too close, keep the noise down, please.

mrcheerful

 

That's far too close for comfort

 

You cannot do any damage with the pump iming out. But you must ensure
cam/crank shafts are correct or you will damage the valves and possibly
pistons.

 

so by having the pump half a revolution out, he is injecting to cylinders 2
and 3 instead of 1 and 4 and vice versa
The engine turns twice to the pump turning once, but the pump does not
inject at the top of the exhaust stroke, only at the top of the compression
stroke. Your assumption is that the pump fires twice per revolution. The
pump has a larger pulley so it only revolves once per two engine
revolutions, hence he could be 180 degrees out.

 

but the valves will not correspond to the pump if it is not set correctly.

 

But you can't get the timing pin in 1/2 a revolution out.

 

Thats what I thought

If you look later on in the thread, mrcheefull explaines which hole is
the right one to use. So all should be ok!!

I would have had a go at timing it up and turning her over this
weekend - but it was freezing out!!

Thanks for the input.

Steven