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Engine Specific Info and Questions => IDI Engine => Topic started by: 92Ecodiesel on March 18, 2006, 07:59:55 pm
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I have had quite the timing issues with my 92 eco turbodiesel. Before I pulled the engine from the donor car it started up and sounded good. After the install I had to have the whole thing timed due to changing the timing belt and not locking the IP pulley in place. Well it jumped time and I took it to the local VW guy and he said ok well its missing the rear bolt on the injector pump no big deal. I got the bolt off the N/A engine i have and use for spare parts and they retimed it. Well it jumped time again and the guy that runs the place and has been working on VW's since 1968 said if it jumps again there is a good chance I have a cracked pulley. I talked to the mechanic there who mostly work on gas jettas and he said he thinks its something with the pump. Well tonight it jumped time again. I am wondering what it could be if its not a cracked pulley and how would a cracked pulley make it keep jumping? Any and all knowledge is welcome. Sorry for the long post and thanks for the info.
Doug :x
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I've not heard of IPs jumping time, but I have heard of IP brackets being crooked (due to cracking or issing bolts), which causes the timing belt to walk off the sprocket and shred itself on the timing cover.
If your IP bolts all have the proper washers, and they are tightening the bolts down properly, I can't imagine a pump getting out of time in so short of a period...? Usually you only loose time from timing belt stretch. Are they sure the woodruff key in the IP pump sprocket is installed, undamaged, and the slots it rides in are not damaged? I heard of a guy once who found a piece of penny (!) as a woodruff key, and that caused all sorts of problems. The key should fit snugly in the slots.
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Are you sure the belt is tensioned properly ? Recheck it after starting,and again after a few weeks,as the belt will stretch some.The belt has to be kept tight,or it will slip.
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I called the shop and told them she jumped time again and I could hear the olg guy in the background saying oh its def. a cracked crank pulley. The lady that works there kind of suggested they were going to put all new pulleys on and start from scratch. I will keep everyone updated as to what happens. :?
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Tear it down and inspect it FIRST,don't just go throwing parts at it.You should be able to see a cracked crank pulley.
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On my 2.4 na eurovan - I went thorough three bottom toothed belt pulleys because I couldn't get it tightened to 300 ft/lb or something stupid.
It would just snap the key that was part of the pulley and then the timing could wander 3 -4 degrees either side of optimum. I got to know when it had gone as I'd start/run it on the cold advance 'choke' lever.
Maybe your's has done similar?
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That sounds familar, I had to run around with the cold start handle out to keep it from missing. The old guy at the shop is pretty sure something is going on with the crank pulley or something going on in that area.
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Can you pulley the altenator pulley off and look at the toothed belt pulley without distirbing it?
On my old GTD engine you can, but on the later 5 cylinder motor you can't - progress? :x
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Well I got my VW back from the shop and the timing gear on the back of the crank pulley that the timing belt rides on was the problem. The pin sheered and it did some damage to the crankshaft. The old guy said hes only seen 3 VW do this and he fixed them with no problems so far, but if it does it again I am looking at a new crankshaft. Hopefully it holds together until june and I overhaul the engine. Thanks for the help and information it was appreciated.
Doug