A failed hydraulic tappet often clicks or clatters. Such noise is louder when the engine is in a cold state, and may automatically disappear after warm-up of the engine.
If noise is heard from all or almost all hydraulic tappets, it may be caused by dirty or glued engine oil, insufficient oil pressure, or presence of oil foams due to water in the oil.
If only one tappet generates noise, the possible reasons include the following: too tight engagement between the plunger piston and the tappet body, soft or broken plunger piston spring, oil leakage of the ball valve, worn plunger piston, improper installation or loss of the snap ring, and insufficient pressure of oil delivered to the plunger piston.
If the hydraulic plunger piston is not properly adjusted or if the ball valve leaks, the plunger piston should be completely cleaned in dedicated solvent such as acetone before further use.
Name: hydraulic tappet
Ref No. : 034109309AD
Replacement Ref No. : 034109309/034109309AC/034109309N/074109309
Applicable models:
Skoda: FAB 04-08/FEL 95-01/OCT 97-11/PICK 96-01
VW: BO 99-01/CA 83-92;96-03COR/89-95/CR 06-16GO/84-98/GOC 84-02/GOLF 98-01/GOSY 86-91;93-98/GOV94-99/ILT 79-88/IMD 77-96;81-08/IMOT 77-09/JE 84-92/LT 83-07/LU 99-06/MA 02-16/PA 82-00/PASY 85-88;90-99/PO 82-02/POC 97-00/SCI 84-92/SHA 96-00/TR 91-04/TRSY 93-04/VE 92-98
Seat: AL 96-00/AR 97-04/CO 97-99/IB 97-99/IN 96-03/LE 00-01/TO 97-01
Audi: A100 83-94/A10Q 91-94/A200 84-91/A20Q 85-91/A3 97-00/A4 95-01/A4Q 95-01/A6 95-01/A6Q 95-97/A80 82-96/ACA 92-00/ACO 81-96/ACOQ 85-96/AQS 80-91/RS2 94-96
