B3000 SE Regular Cab 4WD V6-3.0L OHV (1998)
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Always re-grease the axle shaft main vacuum seal with 3 grams or more of high temperature grease.
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If the wheel hub and bearing pack are ever unbolted from the knuckle, replace and re-grease the wheel bearing O-ring in the wheel bearing
groove as shown. This is a sealing point for the hub vacuum system.
Caution
^ Never attempt to remove or repair the in-board wheel bearing retainer nut. Removal of this nut can cause loss of wheel bearing preload
and severe damage to the wheel hub and bearing.
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In addition to the wheel hub O-ring, the wheel bearing O-ring, and the main knuckle vacuum seal, other sealing points in the wheel end
assembly include:
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steel vacuum line into the knuckle
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wheel bearing seals
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Anti-lock Brake System (ABS) sensor on the wheel bearing (if equipped).
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Upon reassembling the front wheel end system, ALWAYS recheck the vacuum sealing per the PVH troubleshooting section in the Workshop
Manual (page 03-01-41).
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During all diagnostics, note that engagement of the vacuum pulse lasts for approximately 50 seconds. When diagnosing the operation of the
hublock system, let this amount of time pass before checking shaft engagement. The disengagement vacuum timer lasts for approximately 15
seconds. Let this amount of time pass before checking shaft disengagement.
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The engagement vacuum from the solenoid is the high vacuum level and corresponds to the maximum charged level from the engine manifold
in the vacuum canister. The disengagement vacuum from the solenoid is regulated and should measure between 6 and 7 in-HG of vacuum.
Hublocks engage at values around 7.5 ~ 8.5 in-HG.
9.
Verify repair.
