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Engine Specific Info and Questions => IDI Engine => Topic started by: 1985JettaTD on January 20, 2008, 08:08:13 pm
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timing belt on my 1985 1.6TD has been slipping off the pullies since i have replaced the injection pump. told to fix the problem we have to replace the Intermediate shaft pullie with on that doesnt have a lip on it. today we did that and now the belt is being eaten at an even faster rate. 2mm in about 50km. we have no idea what would cause this and need any ideas you might have please help, Thanks very much
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are you missing any I.P. bracket bolts?
Duane
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we were and they have been replece, that is how we first found out the the belt was been eaten
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i wonder what is 'eating it' does it rub on the block side or the cover side? did you replace the timing belt or just the pump?
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it is rubbing on the outside cloest to the fender, seems to rubbing the most down lower on the crank. there was alot of wear marks the pullie that is on the crank that gives power to the alternator and pumps.
when we did the IP we replaced timing belt aswell
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did you remove the crank pulley? if so did you re-use the bolt? maybe there is too much play in the crank down there? maybe time for some new bearings :(
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motor was rebuilt less the 80000km ago with a new short block so all the baring are new and there was no play in crank
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anyone know anything what it might me be please and thanks
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The usual cause is a mis-aligned pump bracket or in extreme cases a very worn main pump bearing.
.Did you replace the missing bolts with official VW parts ? When you tightened the bracket was there any free play that could have caused the bracket to be misaligned ??
Some people have reported needing to shim the front of the pump slightly... never needed to do it myself but others may chime in.
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motor was rebuilt less the 80000km ago with a new short block so all the baring are new and there was no play in crank
Where did you get your short block? (apologies for the hijack... you can also email me [email protected])
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you might try a strait edge accross the sprokets and see any gaps are aparent? you would need one long enough to cross the whole sprokets?
i hope you understand what i'm trying to explain because i'm not sure how to explain it?
thanks Duane
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we have tryed the strait edge across them and they are all lined up, and that is why we are confused it is like there is nothing wrong but the freakin belt is just getting up and walking itself in to the other pullies to piss me off
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The usual cause is a mis-aligned pump bracket or in extreme cases a very worn main pump bearing.
I agree with the main bearing idea. Especially if your car has 600,000km like it says in your signature. Has the pump ever been rebuilt?
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I would say grab all of the sprockets and pull them in the direction the belt pulls 'em to see if they're loose. I recently had to rebuild a IP because the bushing was worn out causing the belt to run off center. I've heard of Int shafts causing this problem to. Good luck :)
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how about the correct tightness of the belt? is it over tight where the pump wore out ? thats all i can think of?
thanks Duane
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he says his motor was rebuilt 80'000km ago with a new short block. it should barely be broken in at this point... i wonder if the two piece thrust bearing was used, and that crank problem is occuring?
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what is this crankl problem that your talking about, i thought that there where only that problem on the 1.9 and not the 1.6
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I recently had to rebuild a IP because the bushing was worn out causing the belt to run off center.
Ditto,
I put a used pump on a customer car and it came back 6 months later with a really skinny belt.. replaced pump with a rebuilt one with new bushing.. works like new..
If the block is rebuilt then the int shaft brgs should have been done.. kind of eliminates that possibility.
I am highly skeptical of the 2 piece bearing causing that, there would have to be extreme wear on all the journals for any misalignment of the crank.
FYI the 2 piece bearing issue is the one where a 2 piece collared thrust washer #3 main is used instead of a the factory style 4 piece main bearing with separate thrust washers.
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If the pump was off, and it worked ok before, I'd start there, and shim it if necessary till it runs straight. I had one eat itself at 40k, and I wasn't happy, Now they get checked at every oil change.
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I've come across something similar.. not sure if your belt does it, but my belt use to walk across the pulleys (side to side), which caused it to rub and fray. I replaced the belt with a new one and it was fixed.
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we pulled the pump off today and found that there was some side to side play in the pump, brought it to our parts guy and he side that there is something wrong with one of the bushings. will bring it back to the place we had it rebuilt at to have it fixed under warranty. will post back when it comes back from the shop
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I am thinking brackets...
Seen this before, make sure ALL the bolt are in.
There should be 4 bolts holding the pump bracket to the engine under the t belt cover, than 3 bolts holding the pump, than 1 bolt from the alternator bracket tot he pump bracket, than 2 bolts for the 90 degree angle bracket to brace the pump bracket, and 2 more on the same bracket that go into the engine to hold it true, than finally 1 last bolt that goes through that same bracket with a large cone nut that braces the back of the pump.
So there are 13 bolts you need to check, check them all.