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    Thread: 2.0L, interference or non-intereference engine?

    1. Member NJTy180's Avatar
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      09-27-2006 01:33 PM #1
      sorry for having to make a post on something thats probably been answered 100 times before, but I cant pick anything up with the Search and none of the links in the "2.0L 8v "Official" DIY/FAQ.." even work so thats completely useless.

      A friends son has a 2001 Jetta MKIV 2.0L and the timing belt broke on him, traveling at low speed (1st gear), and I basically need to know if its an interference or non-interference engine so I can direct him on a route of how to go about getting this repaired.

      Thank you in advance for any help and/or suggestions.

      -Morgan

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    2. 09-27-2006 01:43 PM #2
      i believe its interference...
      which probably means your friend will likely need some valve work done

    3. 09-27-2006 02:25 PM #3
      i thought it was non-interference

    4. Member vasillalov's Avatar
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      09-27-2006 02:39 PM #4
      No question about it! The MK4s are interferance engines. It is stated so in the Bentley manual.

      However, breaking the timing belt DOES NOT NECESSARILY mean that there will be damage. All it means that there MIGHT be a damage!

      Quote Originally Posted by MAG58 View Post
      Please consider your audience before saying something sensible. 80% of TCL drivers were actually banned from Formula 1 for being too fast.
      A turbocharger is a device in where exhaust gases go in, witchcraft happens, and then you go faster.

    5. 09-27-2006 02:40 PM #5
      Here we go...

    6. Member 94jetta~~'s Avatar
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      09-27-2006 02:46 PM #6
      yea this could go either way

    7. Member vwnut18t's Avatar
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      09-27-2006 03:14 PM #7
      Quote, originally posted by vasillalov »
      No question about it! The MK4s are interferance engines. It is stated so in the Bentley manual.

      However, breaking the timing belt DOES NOT NECESSARILY mean that there will be damage. All it means that there MIGHT be a damage!

      I second this. I would definitely have the head pulled just in case but if the pistons hit the valves on an 8v head just remember the valves are not at an angle to bend so if they did hit at full extension you could possibly have some serious damage to the piston. But again it is a MAYBE situation. Pull the head and go from there, thats the smartest thing to do.


    8. Member NJTy180's Avatar
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      09-27-2006 03:24 PM #8
      thanks for all the help guys. Ill see what his wallet will allow him to do now and go from there, lol
      .: MORGAN :.
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    9. 09-27-2006 03:29 PM #9
      Direct him to someone that can do a compression test.

    10. Member NJTy180's Avatar
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      09-27-2006 03:46 PM #10
      yeah well I dont think he's gonna have the $2500 - $2800 to get it done by a dealership and the garage its currently at wont even touch it, so Ill probably help him out and either do it myself or try and find someone who will cut him a break.
      .: MORGAN :.
      FOR SALE : 2001 Jetta VR6 Roller, 97k, Auto, Grey Cloth
      PARTING OUT : 1999.5 Jetta VR6 & 2001 Jetta TDI
      '00 VW Jetta GLS TDI . '93 GMC Typhoon #180 . '01 Chevy Silverado 2500HD 4x4 . '52 Cadillac Coupe

    11. 09-30-2006 08:33 AM #11
      I have a 2.0 engine here he can buy the head if he wants. cheap $350
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    12. 09-30-2006 04:44 PM #12
      Quote, originally posted by Audi4u »
      I have a 2.0 engine here he can buy the head if he wants. cheap $350

      Wow, 350 for a head? I sell OBDII longblocks for 200-225.


    13. 09-30-2006 06:20 PM #13
      Quote, originally posted by ABF Jeff »
      Wow, 350 for a head? I sell OBDII longblocks for 200-225.

      If you sell AEG long blocks for 200-225 I will come down for 2 of them right now.

      Im not here to make money selling stuff i have a complete engine i bought for the block and crank mostly and i paid more than 350 for it.

      But im serious IM me I would like to pick up 2 of those long blocks.
      Thanks
      Andre

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    14. Member Mucci's Avatar
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      10-03-2006 03:33 PM #14
      Definitly interferance. Ive got the dented pistons and shattered valves to prove it.

      Bought a whole motor with 36k for $300 with accessories! Swapped the old out and the new in in a weekend and it was my first swap.


    15. Steve@USRT
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      10-03-2006 03:36 PM #15
      its a 50/50 shot

      assume the worst.


    16. 10-04-2006 03:39 PM #16
      Quote, originally posted by vasillalov »
      No question about it! The MK4s are interferance engines. It is stated so in the Bentley manual.

      However, breaking the timing belt DOES NOT NECESSARILY mean that there will be damage. All it means that there MIGHT be a damage!

      So are the MK3 2.0L interferance engines also?


    17. Member Mucci's Avatar
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      10-04-2006 05:58 PM #17
      Quote, originally posted by kene »

      So are the MK3 2.0L interferance engines also?

      yup, thats what mine was.


    18. 10-04-2006 07:39 PM #18
      Quote, originally posted by Steve@USRT »
      its a 50/50 shot

      assume the worst.

      yep. i bent a valve when i did my head work. i ****ed the timing up because of a cam gear, and my lack of thought to check the gear first. long story short, i got it to fire for like 3 seconds. in that time, it didn't even reach 900rpm and i bent my cylinder 3 exhaust valve.


    19. Member rhussjr's Avatar
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      10-04-2006 08:17 PM #19
      At idle it is non-interference.
      At 60+ mph there is a good chance that it has interference. Especially if you have an aftermarket cam.
      SOWO key chains for "Relay For Life" - Make a difference....

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    20. 10-04-2006 11:09 PM #20

      I didn't even get my car to idle and bent a valve.


      Modified by TheBeliever at 8:12 PM 10-4-2006


    21. Member Mucci's Avatar
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      10-04-2006 11:58 PM #21

      Destroyed mine and it didnt move out of the garage.


    22. Member ps2375's Avatar
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      10-05-2006 12:20 AM #22
      I replaced a timing belt on a MKIII that the belt broke on the interstate and the guy killed the batt trying to restart it and it didn't hurt anything. As stated in previous posts, 50/50 chance on the 2.0's.
      Tradition is the art of making the same mistake repeatedly, on purpose.

    23. Member rhussjr's Avatar
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      10-05-2006 06:09 AM #23
      So, did it make you feel like an Einstein?
      SOWO key chains for "Relay For Life" - Make a difference....

      RIP Marshall Lightner - Staggered Mk4 - I will miss you my Friend and my Brother [12/15/2010]

    24. 10-05-2006 08:36 AM #24
      Quote, originally posted by rhussjr »
      At idle it is non-interference.
      At 60+ mph there is a good chance that it has interference. Especially if you have an aftermarket cam.

      Can you please explain to me how this even makes sense? Valve timing is the same as when you twist the ignition as it is at 6000rpms.

      Valves dont magiaclly grow with increased rpms......lol!

      The ABA is "technically" (by technically, I mean by the Bentley) a non-interference motor with stock valvetrain. BUT, it already has been disproved by a couple guys bending a valve.

      If you pop a belt, get a compression test done first. If it checks out, you;re good.


    25. 10-05-2006 10:03 AM #25
      I forgot to add, that my head is milled .035" so that might have been a factor...

    26. Member rhussjr's Avatar
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      10-05-2006 06:16 PM #26
      At idle when a belt breaks, the engine has a greater chance that it dies at equal cam to crank speeds which means the crank and cam stop spinning at more equal rates (cams stop quicker due to spring pressure).
      At high rpms, when the belt breaks, the cam shaft will stop spinning at an even much quicker than the crank and will have a 50/50 chance that one or more of the valves will be in an open position and thereby making contact with a crank assembly that is still physically turning.
      Luckily, in most 8V heads, the cam has a nautral or neutral position that never really lets the cam rest with either intake or exhaust valves fully opened.
      SOWO key chains for "Relay For Life" - Make a difference....

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    27. 10-07-2006 08:11 AM #27
      Quote, originally posted by tdogg74 »
      Direct him to someone that can do a compression test.

      A compression test requires replacing the timing belt, if there's a damaged valve or two that'd mean you have to do that job twice, there's a better and cheaper way to determine if any damage has been done, a leakdown test.

      Pull all the spark plugs, carefully, turn the engine by hand until all of the pistons are at least 1/4" or so below TDC that way you can turn the cam without about doing any more damage then, make sure the engine can't turn, in a standard, parking brakes on, tranny in gear for an automatic, a wrench on the crank bolt jambed up against a solid body member, then pull upper timing cover so you can see the timing marks on the cam sprocket, turn the cam as though you when lining up the cam for a timing belt change, when the cam is on it's mark, both #1 valves will be closed, now perfrom the leakdown test on #1, turn the cam 90°, test #3, another 90° the cam and test #4, one final 90 and test #2. A damaged valve will cause massive leak down


    28. Member rhussjr's Avatar
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      10-07-2006 08:25 AM #28
      If a valve is bent, an audible flow of air will be heard either out the exhaust of echoing in the intake manifold or coming out the throttle body.
      SOWO key chains for "Relay For Life" - Make a difference....

      RIP Marshall Lightner - Staggered Mk4 - I will miss you my Friend and my Brother [12/15/2010]

    29. 10-07-2006 08:30 AM #29
      That's the point, a leak down test whether by the readings or the sound will quickly determine if there's a serious problem without having to do a lot of other perhaps unnecessary work first.

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