Hatchback 4WD F4-1781cc 1.8L (1983)
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Inspect the cone for any debris or damage and clean or replace as necessary
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Perform the Centering Check® Procedure (software version 2.1 and higher) before each wheel is balanced
PROCEDURE
Always verify the concern with a test drive before beginning diagnosis and performing repairs. Drive the vehicle a minimum of 10 miles to eliminate any
flat spots on the tires. Immediately after the road test, lift the vehicle into the air to minimize flat spotting. Adjust tire pressures according to the door
label and inspect for any visible damage. If any damage is found, resolve these concerns before continuing with diagnosis.
Tire dynamic imbalance should be measured first and adjusted to within 5 grams. Leave any remaining factory weights in place and remove weights that
have been added afier production; be careful not to damage the wheel.
If the assembly cannot be adjusted to within 5 grams, inspect for the following:
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Improperly mounted tire or unseated tire bead
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Improperly mounted assembly to the balancer
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Damage to the wheel or tire
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Damage to the tire balancer
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Debris located inside the tire
If a vibration can still be felt afier the wheels have been properly balanced, there is a possibility of excessive radial force variation (RFV) in the tire and
wheel assembly. To address RFV concerns, a wheel balancer capable of measuring RFV must be used; Subaru Of America Inc. recommends the use of
the Hunter GSP 9700 Road Force Measurement System. If a GSP 9700 is not available, locate the nearest machine through the Hunter Engineering web
site (www.gsp9700.com).
Measure and record the RFV readings of the wheel and tire assembly for R1H. Then perform the wheel runout measurements by following the on-screen
instructions or by referring to the operating instructions; this will determine the individual tire and wheel RFV measurements. The following assembly
RFV measurements can be used as a guide:
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R1H on passenger tires - 8.0kg (17.6lbs) or less
If higher than normal RFV measurements are found for the assembly, refer to the on-screen instructions or the operating instructions to match the tire and
wheel to minimize the assembly RFV By matching the low spot of the tire to the high spot of the wheel, radial force can be reduced without replacing
any components.
After all RFV measurements are adjusted to the lowest possible level, install the wheels with the lowest RFV measurements on the front of the vehicle
and road test to verify the concern has been reduced.
Replacement of tires due to excessive assembly measurements may be unnecessary.
If the concern still exists at an unacceptable level, contact the Subaru Technical HelpLine with the following information readily available:
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Thorough description of customer's concern
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VIN
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Mileage
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Tire manufacturer, size and condition
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Completed "Dealer vibration Analysis Worksheet and Tire Analysis Worksheet" available under TechLine Pre-Call Worksheets on Subarunet. (All
measurements should be in grams or kilograms)
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Service history of vehicle
WARRANTY/CLAIM INFORMATION
