Vehicle - Vibration Diagnosis

Bulletin No.: T-89-101
File in Group: 0
Number: 34
Corp.Ref.No.: 710124R
Date: May, 1989

SUBJECT:
VIBRATION DIAGNOSIS USING A REED TACHOMETER AND ROTATIONAL ORDER CHARTS

MODELS AFFECTED:
1988-1989 DE VILLES, FLEETWOODS, BROUGHAMS, STS SEVILLES, AND ALLANTES
1988 CIMARRONS

To aid in diagnosis of vibrations, Cadillac has developed rotational order charts. These charts combined with resonant reed tachometer provide a systematic method for diagnosing vibration conditions. Refer to Serviceman Bulletin T-86-4, Group 0 for background and use of reed tachometers. This bulletin includes rotational order charts for the following vehicles:

1988-1989 DeVilles and Fleetwoods

1988-1989 Eldorados and Sevilles

1988-1989 STS Sevilles

1988-1989 Broughams

1988-1989 Broughams with Trailer Towing Package

1988-1989 Allantes

1988 Cimarrons with Automatic Transaxle

1988 Cimarrons with Manual Transaxle





ROTATIONAL ORDER CHART
1988 DEVILLE AND FLEETWOOD IN 4TH GEAR, VCC ENGAGED

NOTE:
RPM VS. MPH IS AN APPROXIMATION ONLY. THIS RELATIONSHIP MAY VARY FROM VEHICLE TO VEHICLE OR UNDER DIFFERENT DRIVING CONDITIONS. THEREFORE, USE THE MPH SCALE FOR ROAD SPEED SENSITIVE ITEMS (I.E. TIRES) AND USE THE RPM SCALE FOR ENGINE SPEED SENSITIVE ITEMS (I.E. GENERATOR, A/C COMPRESSOR, AIR PUMP STEERING PUMP WATER PUMP AND CRANKSHAFT).





ROTATIONAL ORDER CHART
1989 DEVILLE AND FLEETWOOD IN 4TH GEAR, VCC ENGAGED

NOTE:
RPM VS. MPH IS AN APPROXIMATION ONLY. THIS RELATIONSHIP MAY VARY FROM VEHICLE TO VEHICLE OR UNDER DIFFERENT DRIVING CONDITIONS. THEREFORE, USE THE MPH SCALE FOR ROAD SPEED SENSITIVE ITEMS (I.E. TIRES) AND USE THE RPM SCALE FOR ENGINE SPEED SENSITIVE ITEMS (I.E. GENERATOR, A/C COMPRESSOR, AIR PUMP STEERING PUMP WATER PUMP AND CRANKSHAFT).





ROTATIONAL ORDER CHART
1988 ELDORADO AND SEVILLE IN 4TH GEAR WITH VCC ENGAGED

NOTE:
RPM VS. MPH IS AN APPROXIMATION ONLY THIS RELATIONSHIP MAY VARY FROM VEHICLE TO VEHICLE OR UNDER DIFFERENT DRIVING CONDITIONS. THEREFORE, USE THE MPH SCALE FOR ROAD SPEED SENSITIVE ITEMS (I.E. TIRES) AND USE THE RPM SCALE FOR ENGINE SPEED SENSITIVE ITEMS (I.E. GENERATOR, A/C COMPRESSOR, AIR PUMP STEERING PUMP WATER PUMP AND CRANKSHAFT).





ROTATIONAL ORDER CHART
1989 ELDORADO AND SEVILLE IN 4TH GEAR WITH VCC ENGAGED

NOTE:
RPM VS. MPH IS AN APPROXIMATION ONLY. THIS RELATIONSHIP MAY VARY FROM VEHICLE TO VEHICLE OR UNDER DIFFERENT DRIVING CONDITIONS. THEREFORE, USE THE MPH SCALE FOR ROAD SPEED SENSITIVE ITEMS (I.E. TIRES) AND USE THE RPM SCALE FOR ENGINE SPEED SENSITIVE ITEMS (I.E. GENERATOR, A/C COMPRESSOR, AIR PUMP STEERING PUMP WATER PUMP AND CRANKSHAFT).





ROTATIONAL ORDER CHART
1988/89 STS SEVILLE IN 4TH GEAR WITH VCC ENGAGED

NOTE:
RPM VS. MPH IS AN APPROXIMATION ONLY THIS RELATIONSHIP MAY VARY FROM VEHICLE TO VEHICLE OR UNDER DIFFERENT DRIVING CONDITIONS. THEREFORE, USE THE MPH SCALE FOR ROAD SPEED SENSITIVE ITEMS (I.E. TIRES) AND USE THE RPM SCALE FOR ENGINE SPEED SENSITIVE ITEMS (I.E. GENERATOR, A/C COMPRESSOR, AIR PUMP STEERING PUMP WATER PUMP AND CRANKSHAFT).





ROTATIONAL ORDER CHART
1988/89 BROUGHAM WITH 2.93 REAR AXLE IN 4TH GEAR, TCC ENGAGED

NOTE:
RPM VS. MPH IS AN APPROXIMATION ONLY THIS RELATIONSHIP MAY VARY FROM VEHICLE TO VEHICLE OR UNDER DIFFERENT DRIVING CONDITIONS. THEREFORE, USE THE MPH SCALE FOR ROAD SPEED SENSITIVE ITEMS (I.E. TIRES) AND USE THE RPM SCALE FOR ENGINE SPEED SENSITIVE ITEMS (I.E. GENERATOR, A/C COMPRESSOR, AIR PUMP STEERING PUMP WATER PUMP AND CRANKSHAFT).





ROTATIONAL ORDER CHART
1988/89 BROUGHAM WITH TOWING PACKAGE IN 4TH GEAR, TCC ENGAGED

NOTE:
RPM VS. MPH IS AN APPROXIMATION ONLY. THIS RELATIONSHIP MAY VARY FROM VEHICLE TO VEHICLE OR UNDER DIFFERENT DRIVING CONDITIONS. THEREFORE, USE THE MPH SCALE FOR ROAD SPEED SENSITIVE ITEMS (I.E. TIRES) AND USE THE RPM SCALE FOR ENGINE SPEED SENSITIVE ITEMS (I.E. GENERATOR, A/C COMPRESSOR, AIR PUMP STEERING PUMP WATER PUMP AND CRANKSHAFT).





ROTATIONAL ORDER CHART
1988 ALLANTE IN 4TH GEAR WITH VCC APPLIED

NOTE:
RPM VS. MPH IS AN APPROXIMATION ONLY. THIS RELATIONSHIP MAY VARY FROM VEHICLE TO VEHICLE OR UNDER DIFFERENT DRIVING CONDITIONS. THEREFORE, USE THE MPH SCALE FOR ROAD SPEED SENSITIVE ITEMS (I.E. TIRES) AND USE THE RPM SCALE FOR ENGINE SPEED SENSITIVE ITEMS (I.E. GENERATOR, A/C COMPRESSOR, AIR PUMP STEERING PUMP WATER PUMP AND CRANKSHAFT).





ROTATIONAL ORDER CHART
1989 ALLANTE IN 4TH GEAR WITH VCC ENGAGED

NOTE:
RPM VS. MPH IS AN APPROXIMATION ONLY. THIS RELATIONSHIP MAY VARY FROM VEHICLE TO VEHICLE OR UNDER DIFFERENT DRIVING CONDITIONS. THEREFORE, USE THE MPH SCALE FOR ROAD SPEED SENSITIVE ITEMS (I.E. TIRES) AND USE THE RPM SCALE FOR ENGINE SPEED SENSITIVE ITEMS (I.E. GENERATOR, A/C COMPRESSOR, AIR PUMP STEERING PUMP WATER PUMP AND CRANKSHAFT).





ROTATIONAL ORDER CHART
1988 CIMARRON WITH AUTOMATIC TRANSAXLE IN 3RD GEAR WITH TCC ENGAGED

NOTE:
RPM VS. MPH IS AN APPROXIMATION ONLY. THIS RELATIONSHIP MAY VARY FROM VEHICLE TO VEHICLE OR UNDER DIFFERENT DRIVING CONDITIONS. THEREFORE, USE THE MPH SCALE FOR ROAD SPEED SENSITIVE ITEMS (I.E. TIRES) AND USE THE RPM SCALE FOR ENGINE SPEED SENSITIVE ITEMS (I.E. GENERATOR, A/C COMPRESSOR, AIR PUMP, STEERING PUMP, WATER PUMP, AND CRANKSHAFT).





ROTATIONAL ORDER CHART
1988 CIMARRON WITH 5-SPEED MANUAL TRANSAXLE IN 5TH GEAR

NOTE:
RPM VS. MPH IS AN APPROXIMATION ONLY THIS RELATIONSHIP MAY VARY FROM VEHICLE TO VEHICLE OR UNDER DIFFERENT DRIVING CONDITIONS. THEREFORE, USE THE MPH SCALE FOR ROAD SPEED SENSITIVE ITEMS (I.E. TIRES) AND USE THE RPM SCALE FOR ENGINE SPEED SENSITIVE ITEMS (I.E. GENERATOR, A/C COMPRESSOR, AIR PUMP STEERING PUMP WATER PUMP AND CRANKSHAFT).