Chevette L4-98 1.6L (1982)
Fluid Pump: All Technical Service Bulletins
A/T - Whistling Noise at Engine Idle
Number:
83-T-30
Section:
VIIc
Date:
Apr., 1983
Subject:
WHISTLING NOISE AT ENGINE IDLE
SPEED - 1982-83 CHEVETTES WITH THM 180C (BUILT PRIOR TO BREAKPOINT SERIAL #2649550)
TO:
ALL CHEVROLET DEALERS
The vehicles referenced above may exhibit the following condition:
High pitched whistling noise occurring in reverse, drive and manual lo with the engine warm to hot. The noise which is only heard at
engine idle speeds sounds like a whistling tea kettle. Do not confuse this whistle noise with pump whine or cavitation which can be caused
by either a plugged oil filter or leaking oil filter gasket. This whistling noise, if found, is coming from the converter feed hole located in the
oil pump wear plate.
To eliminate this whistling noise, obtain a new oil pump wear plate, P/N 96013212, from WDDGM and install it.
If the oil pump wear plate is obtained from dealership stock rather than from WDDGM, check the surface finish prior to installing the part.
If the surface of the part is bright or shiny with wire brush or grind marks running in one direction across the surface - do not use the part.
It may result in a reoccurrence of the noise condition. If the surface is dull with many small marks in an irregular pattern the part is OK to
use.
When reassembling the transmission follow the steps shown in your service manual and be certain to use the converter to oil pump
alignment tool J-23082-01.
