Author Topic: Asv timing failur  (Read 3236 times)

August 23, 2017, 05:09:36 am

Bigmick77380

  • Junior

  • Offline
  • **

  • 50
Asv timing failur
« on: August 23, 2017, 05:09:36 am »
Hi everybody, i have a asv with timing failur, not the time to open the engine for now, but one hydrolic lifter juste exploded, and two are craked but i don't know how that append, that append in a linear drive ( no acceleration) the timing belt is still stretched, the camshaft look good i don't understand how that happened...
Any idea ...?



Reply #1August 23, 2017, 05:31:42 pm

vanbcguy

  • Administrator
  • Veteran

  • Offline
  • *****

  • 2831
  • Personal Text
    Vancouver, BC
Re: Asv timing failur
« Reply #1 on: August 23, 2017, 05:31:42 pm »
Do you know much history on the engine?

If the belt is old or poor quality it may have lost some teeth. This usually happens at the crank gear since it has the least wrap there and the most force. If that happens it'll do damage despite the belt still being tight.

If the belt is intact it is possible the damage you see is from a past timing incident. Someone may have just put a new belt on and hoped for the best previously, now a damaged part has failed completely.

Sent from my LG-H873 using Tapatalk

Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #2August 24, 2017, 02:05:10 pm

Bigmick77380

  • Junior

  • Offline
  • **

  • 50
Re: Asv timing failur
« Reply #2 on: August 24, 2017, 02:05:10 pm »
The engine have 280 000 km (174 000 miles), buy by a friend at 180 000km (112 000 miles), it was a second end, when he buy the car, the belt has been changed, run good, i buy the car, 3 month ago, change the belt by myself (that's not my first time :) ) (its a Continal belt kit with water pump, etc...) do 2000km (1300 miles), and boom, engine stop, don't understand how  ???

Reply #3August 24, 2017, 03:40:45 pm

vanbcguy

  • Administrator
  • Veteran

  • Offline
  • *****

  • 2831
  • Personal Text
    Vancouver, BC
Re: Asv timing failur
« Reply #3 on: August 24, 2017, 03:40:45 pm »
Guess you'll have to start taking things apart... Cam sprocket tight?

Sent from my LG-H873 using Tapatalk

Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #4August 24, 2017, 04:15:10 pm

Bigmick77380

  • Junior

  • Offline
  • **

  • 50
Re: Asv timing failur
« Reply #4 on: August 24, 2017, 04:15:10 pm »
It don't move by the hand, but don't know if it realy tight, now i don't have time to control this, but within one week, i will.
But i note something, the hydrolic lifter who exploded, don't "just exploded, it jump out of it place (i think), it got stuck between head and camshaft exhaust cam, and when the cam go down, the lifter exploded.
I say this because, the head have little mark on the lifter place, and next to the exhaust lifter, a circular mark (and pieces of iron everywhere)

Reply #5August 24, 2017, 08:12:49 pm

vanbcguy

  • Administrator
  • Veteran

  • Offline
  • *****

  • 2831
  • Personal Text
    Vancouver, BC
Re: Asv timing failur
« Reply #5 on: August 24, 2017, 08:12:49 pm »
Typically that only happens after a valve hits a piston...

I think we are just guessing until the head comes off!

Sent from my LG-H873 using Tapatalk

Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #6August 29, 2017, 01:14:33 pm

Bigmick77380

  • Junior

  • Offline
  • **

  • 50
Re: Asv timing failur
« Reply #6 on: August 29, 2017, 01:14:33 pm »
After some investigation, we found out that the cam sprocket was untighted, i don't know how.

Reply #7August 29, 2017, 06:17:09 pm

vanbcguy

  • Administrator
  • Veteran

  • Offline
  • *****

  • 2831
  • Personal Text
    Vancouver, BC
Re: Asv timing failur
« Reply #7 on: August 29, 2017, 06:17:09 pm »
Ugly. Unfortunately that failure has happened before. The factory torque spec is somewhat low - it may be sufficient for a brand new clean sprocket on a brand new clean cam but it isn't enough for dirty parts. Most folks around here go for about 50% more than the book spec.

Your best course of action will probably be to find a new head. When the lifter left the bore it probably chewed it up some; while repairable the machining cost is usually not worth it.

Make sure you check piston protrusion - look for any that are significantly lower as that may indicate bent rods.

Sent from my LG-H873 using Tapatalk

Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #8August 30, 2017, 02:45:19 am

Bigmick77380

  • Junior

  • Offline
  • **

  • 50
Re: Asv timing failur
« Reply #8 on: August 30, 2017, 02:45:19 am »
In fact, i will buy a other engine, less expensive, do you know the torque value for the bolt ? For thight up the new one, don't want that happen again...thanks for your answer :)

Reply #9August 30, 2017, 03:58:16 am

vanbcguy

  • Administrator
  • Veteran

  • Offline
  • *****

  • 2831
  • Personal Text
    Vancouver, BC
Re: Asv timing failur
« Reply #9 on: August 30, 2017, 03:58:16 am »
I think the factory setting is like 32 ft-lbs, most feel more comfortable at about 45 ft-lbs.

If you have the cam sprocket off clean everything well with brake cleaner right before assembly.

Sent from my LG-H873 using Tapatalk
Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #10September 07, 2017, 05:50:08 am

Bigmick77380

  • Junior

  • Offline
  • **

  • 50
Re: Asv timing failur
« Reply #10 on: September 07, 2017, 05:50:08 am »
Thanks, i think i will do the engine replacement by the week :)

Reply #11October 08, 2017, 01:43:44 pm

Bigmick77380

  • Junior

  • Offline
  • **

  • 50
Re: Asv timing failur
« Reply #11 on: October 08, 2017, 01:43:44 pm »
So! i do the engine replacement, work well, but pressure in cooling circuit... head gasket. Leak in 3 cylinder, after a head repair and new head gasket, no more leak, but now the car have a power probleme with a crazy consumption.
When i change the timing belt, i notice that the camshaft was shift about 2 teeth (delay) with the old timing belt, crankshaft and IP was good, so i place the pump, the camshat and crankshat on the right position, but now, no more power, i notice that the pump have too much delay with vagcom, so i adjust it, better, but not good.
I check turbo pressur, it is good, don't understand the problem, don't understand why the pump timing was not good (delay)
any idea ?

Reply #12October 08, 2017, 01:58:53 pm

air-cooled or diesel

  • Guest
Re: Asv timing failur
« Reply #12 on: October 08, 2017, 01:58:53 pm »
When i change the timing belt, i notice that the camshaft was shift about 2 teeth (delay) with the old timing belt,
2 teeth is a lot, is it possible damaged valve(s) and is hasnt gotten bad enough to cross with piston(s) yet?
do you have the complex vacuum engine,timing management, like mk3s have? if so replacing and correcting hose 'pattern' may be the key.

Reply #13October 08, 2017, 02:12:07 pm

Bigmick77380

  • Junior

  • Offline
  • **

  • 50
Re: Asv timing failur
« Reply #13 on: October 08, 2017, 02:12:07 pm »
No the valves don't hit pistons, i'm sure of that, i replace all the vacuum line, the turbo work very well, i don't think that the probleme is here...
By the way, thanks for answer

 

Fixmyvw.com