1.8L OHC Engine Knock Noise - TENSIONER/Idler Pulley (SUB0482AP)

Publication date: 1993-06-01
Reference number: SUB0482AP

1.8L OHC ENGINE KNOCK NOISE - TENSIONER/IDLER PULLEY

TECHNICAL INFORMATION TIP

Reference Number(s): SUB0482AP, Date of Issue: June 1993

KNOCKING NOISE IN 1800 OHC ENGINE

YEAR(S): 1985-93

MANUFACTURER: Subaru

MODELS: STD/GL/DL; Loyale

DATE OF ISSUE: June 1993

ISSUE & TIP

A knocking noise on 1985 and later Subaru 1800 overhead cam engines may be caused by a bad idler or tension pulley bearing or a loose timing belt. This engine has two timing belts, two tensioner pulleys, and one idler pulley, so there are a lot of possibilities.

Make sure the belts are properly tensioned first. A loose left timing belt will cause a knocking noise from the distributor area. If both belts are properly tensioned, try to determine which side of the engine the noise is coming from.

Once you've got it narrowed down, remove both timing belts and inspect the idler and tensioner bearings. It might not be a bad idea to replace them all along with two new belts at this time, unless you don't mind going through this exercise again some time in the future.

Courtesy of Import Service Magazine

with thanks to:

Dan Mayrin

Pacific Import Auto

Tacoma, Washington

REFERENCE NUMBER

SUB0482AP

NOTE: This information has been obtained from sources generally believed to be reliable. Use your own judgment before relying on this data. Neither the suppliers of these Technical Information Tips, nor lemon-25 Repair Information Company, LLC, guarantees or assumes responsibility for data accuracy or completeness, nor is liability assumed by the suppliers of these Technical Information Tips or lemon-25 Repair Information Company, LLC, for any claims or damages resulting from the use of this information.