[V6-12v] V6-12V lifter problem ?

[Damien Gaboury]

 I got the problem.
Thank to Elliot Potter for it detailed instruction for checking the hydraulic lifters.

Yes, it is one lifter. The hydraulic lifter abouve the exhaust valve is worn out. I can push it easily and feel and hear the spring motion within it, whereas other are full of oil and cannot be pushed down. 

Next step, is to replace it. What about the simplest procedure to do that. I aware about the timing belt. Unfortunately, this belt and the water pump are new (less that 1 year and 20 000 km on it).

Any technical tip about that replacement ?

Car: 90SQ 1993, AAH engine with 156 000 km

Damien Gaboury, PhD
Scientifique de recherche
Consortium de Recherche en Exploration Minérale (CONSOREM)
Université du Québec à Chicoutimi
555 Boul. de l'Université, Chicoutimi, Qc, Canada, G7H 2B1
e-mail: damien_gaboury at uqac.uquebec.ca
Visitez notre site web: http://depcom.uqac.uquebec.ca/consorem
  ----- Original Message ----- 
  From: Damien Gaboury 
  To: v6-12v at audifans.com ; Todd Young ; Elliott Potter ; William Magliocco 
  Cc: QuattroList 
  Sent: Thursday, November 30, 2000 1:50 PM
  Subject: [V6-12v] V6-12V lifter problem ?


  I really need help. 
  I have a problem with the no 2 cylinder on the V6 -12V (AAH engine). The spark becomes fouled with carbon very quickly (in less that 10 km drive). I drive the car with strong engine vibrations at idle and between idle and 3000 rpm since 3 weeks.

   Here are the parameters:

  - Resistance of injector = OK

  - Impulsion on the injector = OK

  - Compression of the cylinder no 2 = 130 psi (checked by my mechanic)

  - Coil resistance = OK

  - Spark plug new (Bosch)

  - Plug wire new (Bosch)

  - Fire at the spark.

  Yesterday night, I swapped the injector (hoping for a leaking injector) of the bad cylinder with another in order to check if the problem follows the injector and hence, being simply related to a worn injector. Result: no. The problem is still at the same cylinder.

  Following that new information, the guest of my mechanic is that the problem is related to a bad hydraulic lifter. It is possible to have good compression in the cylinder with bad filter ?

  Is it possible to check for the lifter condition simply by removing the valve cover?

  Any tips will be greatly appreciated to solve that weird problem and for sure costly problem.

  Damien Gaboury, PhD
  Scientifique de recherche
  Consortium de Recherche en Exploration Minérale (CONSOREM)
  Université du Québec à Chicoutimi
  555 Boul. de l'Université, Chicoutimi, Qc, Canada, G7H 2B1
  e-mail: damien_gaboury at uqac.uquebec.ca
  Visitez notre site web: http://depcom.uqac.uquebec.ca/consorem

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