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2.5 acv fuel pump timing

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19K views 10 replies 5 participants last post by  Or_GazM  
#1 ·
Hello fellow t4 nuts and gurus

Bit of a long winded post, started a new job on Monday, first job was to re-commission a 1998 2.5 tdi t4(that has been worked on by a previous mechanic), usual stuff service, shocks, brake hoses etc.

The customer wanted a cam belt done on it about 6 months ago and where I'm working was another mechanic, he removed the belt and the got swamped with other work, left the belts off of the van, and the just buggered off 2 weeks ago leaving the owner of the business in the lurch, (came in Monday morning 2 weeks ago and found he had taken all his tools and left his keys by the main door).

Now my job is to get the van running again, I have done many belts in the past, and am used to locking pins etc on the crank and cam shaft, when doing some research i see that you lock the cam from the pump end with a special tool (which is turning up tomorrow), is there any way of checking where the piston is on #1 tdc? i have gone trough about 15 different how to's and videos and spoke to other seasoned mechanic friends at other garages and when I spoke to them they laughed and said 'have fun with that'.

When putting the 'rear' pulley back on, does it have a wood ruff key or is it just a taper fit? does anyone have a picture of where the little notch on the rear pulley should be as a visual guide?

Sorry for the long winded post but any info or pics you guys could share with me would be greatly appreciated

Thanks once again

Simon:ILU:
 
#5 ·
This is a good place to start off with my problem as well as some of it ties into the thread above.
Background is a T4 combi run into the ground, and then rescued after being used as a lounge in a African Township.
I took out the engine and replaced all replaceables except the crank and conecting rods.
puti it all together and it would'nt start. Put in new (second hand ) pump and injectors and it started but oil pressure dropped as soon as engine started to work. Pulled engine and put in a new oilpump to replace the new oilpump that was in there.
Put all back together and on first try discover a broken cam lifter. Replaced that, and the oil cooler just to be sure, took the head to engineering to smooth out the burring caused by the follower's demise, and replaced the camshaft as it showed some wear on the lobe driving the vacuum pump. Put it all back together , and now it refuses to start... Help please I am at wits end.
 
#6 ·
As I understand the pump timing, the keyway on the dieselpump shaft must be directly in line with the nr 1 fuel line. That would be the one at about 1 o clock if you look at the pump from the back, and imagine that it is the face of the clock. Keyway lining up with the centre of your pump, you would probably need a ruler, and a sharpie to transfer the line over to your keyway, or you can draw a line on the pump pulley when it is not on the shaft, and if they line up, it should start, bar a bit of fiddling with the timing when you loosen the nut on the taper fit pulley to get that engine sounding just right, that is if you can get it started ,(Which mine does not want to do..) If the engine is then at TDC it should start ..... or not as in my case..
I probably need dowel gauges and a lot of computers, but It did run when I had it at that setting.
 
#7 ·
You don't need "a lot of computers".....just an old laptop running Windows XP, an OBDII lead and a registered VCDS lite (99$).
Total cost in UK would be around ÂŁ150....I'll let you convert to local currency.
Yeah, you have to get it running, and up to temp, but then VCDS shows when the timing is "correct"...55 on the graph.
 
#8 ·
You do not need to remove the pump pulley or see the keyway, you set the static timing with a 15mm tool/ 15mm tube that fits through one of the holes in the pump pulley and locks the position, if that is right then it should start.
My pump pulley on the 2.4 also has a notch in the pulley wheel which lines up with a notch on the pump mount bracket at about 9 oclock.
 
#9 ·
Help please my oil pressure is down... Dont know why?

Right as there does not seem to be an incredible reaction to this post, I shall carry on with the saga as I had to keep on working on my project T4. I took off the head again, as there seemed to exhaust gas coming from the water pipes, as we were attempting to start up. after taking off the cylinder head, and putting in a new gasket, again,
So indeed the head gasket had blown. Seems my trusty Mechanic did not Torque properly. This now the not so trusty mechanic. I did the torqueing myself this morning, she started right up , pump keyway going down towards 2 o clock , maybe a bit further. When you look at the pump from the back that is.

Now it seems I am back at Square one. Oil pressure is low, and declines as engine heats up.. DOES ANYBODY HAVE ANY IDEA WHY IT DOES THIS?
I am measuring with a mechanical gauge , engine does sound good though.
To recap, New Mains , new Big ends and the two middle pistons , new rings, new Oilpump( FEBI Bilstein )twice over.
DID valves , cam followers: replaced 2 after one broke.
Replaced dieselpump and injectors.
Replaced Camahaft .
 
#11 ·
Quote;
" I took off the head again, as there seemed to exhaust gas coming from the water pipes, as we were attempting to start up. after taking off the cylinder head, and putting in a new gasket, again, "

I hope you used new head bolts....they are a "one time fit" as they are designed to stretch as you torque them up.