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2.5TDi AEL pump timing problems

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  • Monkeymagic
    replied
    Excellent news. I've always found having an easy to see reference mark on the cam/pump pulley helps no end.

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  • AndyP
    replied
    Originally posted by Monkeymagic View Post
    Reference mark on pump pulley to cam cover. Loosen the pulley keeping the cam timing set. Advance the timing and re tighten the pulley. See how she starts and check with vcds. They are frustrating but once you get used to the tiny movements required to advance and retard you'll get there. The reference tippex mark is the best way I have learned to get a basic setting before fine tweaking on vcds.
    Great advice, thanks! Scribed a line with a Sharpie and after a couple of tweaks I could tell by the sound that it was better, plugged in VCDS and it only wanted a small adjustment on the pump to be dead on. Checked this morning on a 1°C cold start and it fired right away

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  • AndyP
    replied
    I've done this a couple of times before and always got it close enough using the marks that I could fine tune it with VCDS, this time it just seems like something is out.

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  • Monkeymagic
    replied
    Only issue uve had with t4 is that the cam that drives dial gauge can wear meaning the readings are all wrong.
    I prefer the vcds way. I'm not familiar with bethe tensioners on this engine but assume one is a roller that has a reference mark to the cylinder head and the other is a tensioner with a pointer?
    Despite locking the fuel pump I've yet to do a cambekt on t4 then never had to mess with pump timing after. But will confess to not being familiar with this engine.

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  • twoqu
    replied
    Andy, PM me wih email!

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  • twoqu
    replied
    Andy,
    If you set the pump up correctly statically following the factory procedure with a few tools, then it will be spot on! Assuming that the engine TDC is also correct and you have the correct A6 pump belt (80 tooth?).
    I think you have the correct 3303 tensioner. You'll need a dial gauge adaptor for the pump. a dial gauge and some means of rotating the camshaft pump pulley and counterholding it during tightening.
    That way its all set up from scratch and you don't have to make any more marks anywhere!
    I'll try and send the info I have cobbled together via PM or alternatively PM me your email.

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  • Monkeymagic
    replied
    With the reference point on the cam pulley it saves keep trying so see the pump marks which never seems to line up. I alway dial in a bit of advance to begin with. You can normally feel the resistance on the pump pulley when you are in the right window.

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  • AndyP
    replied
    Originally posted by Monkeymagic View Post
    Reference mark on pump pulley to cam cover. Loosen the pulley keeping the cam timing set. Advance the timing and re tighten the pulley. See how she starts and check with vcds. They are frustrating but once you get used to the tiny movements required to advance and retard you'll get there. The reference tippex mark is the best way I have learned to get a basic setting before fine tweaking on vcds.
    Thanks, if it ever stops raining, I'll give that a try.

    Leave a comment:


  • Monkeymagic
    replied
    Reference mark on pump pulley to cam cover. Loosen the pulley keeping the cam timing set. Advance the timing and re tighten the pulley. See how she starts and check with vcds. They are frustrating but once you get used to the tiny movements required to advance and retard you'll get there. The reference tippex mark is the best way I have learned to get a basic setting before fine tweaking on vcds.

    Leave a comment:


  • Monkeymagic
    replied
    I get this regular on t4s and end up helping lots of garages. Set the engine to tdc. Mark with tippex a r

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  • Thuppu
    replied
    Of course not the right way, but the timing can be set very well without VCDS, just have to move the timing like 1mm and try it out. I had a Volvo with the same AEL engine. Bought it with a snapped timing belt, broken cam and a couple of bend valves, so had to take the head off. Had no locking tools and no program to check the fuel pump timing. First I had the pump in 180 degree wrong posititon, but swapped it over and the car tried to fire so it was close. Moved timing, tested, moved again, tested, now started up. Did go for a drive, worked fine, maybe little bit sluggish.. and cold start was quite long, so moved the timing a tad more, and now perfect start and power and almost no smoke.

    The area where the pump works is just a couple of mm, so it's needed to adjust in very small steps.

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  • Tractor Dave
    replied
    Ok, this was a few years ago and the car is long sold but I’m sure my vag guy had something which locked the pump timing as well. She now has a 4pot diesel which is a bit more simple!


    Sent from my iPhone using Tapatalk

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  • AndyP
    replied
    Originally posted by Tractor Dave View Post
    I think I've read every post on pump timing this week! I was going to try advancing the pump by a tooth on the belt, but it wasn't like this before and it ran perfectly?

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  • AndyP
    replied
    The only locking tool there is, is for the camshaft, and thats just a piece of flat bar that locks it paralell to the cam cover surface, you put feeler gauges under each side to shim it up.

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  • Tractor Dave
    replied
    And maybe this will help
    https://www.vwt4forum.co.uk/archive/.../t-435866.html

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