T1000 L4-111 1.8L DSL (1983)
Fluid Pump: Customer Interest
Engine - Whistling Noise at Idle
Number 83-T-20
Section 7 Date 04/83
Subject:
WHISTLING NOISE AT ENGINE IDLE - 1982 AND 1983 1000 MODELS WITH THM 180C TRANSMISSION
Some THM 180C transmissions built prior to serial number 2649550 may exhibit a high pitched whistling noise that occurs 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 (part number 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
recurrence 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.
