1994 Toyota 4Runner Spun Bearing

1994 ALL OTHER MAKES ALL OTHER MODELS
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4-RUNNER
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  • 3 POSTS
i spun a bearing but ive been told i can change them without taking the motor out . which leaves me to believe that this is common . how can i tell if the crank is damaged and if there is still some bearing protecting the rod and crank would it be ok . ive changed them but their not the right size. so ima change them again. i guess what im asking is since the bearing material is so much softer thatn the rod and crank . it shopuld be ok right? the bearing was squished but it was still separating the rod from the crank. please respond asap thanks ........4 runner
Jan 1, 2007 at 8:53 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Dirt is the major enemy on engine rebuilding. you can use a plastigage to read the clearance and then decide to go undersize bearings.No funds -like back in the old days we'll use leather instead of bearings for quick fix for DIY's.

You need to investigate why those bearings when bye-bye. might be a bent crank,taper or out of round. Best fix is to get a crank kit.
Jan 3, 2007 at 8:37 PM
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Suggested Repair

Measure rod-bearing clearance with Plastigage and use the correct undersize bearings if needed. Inspect the crankshaft for bend, taper, or out-of-round wear, and use a crankshaft kit if it is damaged. Keep the engine extremely clean during assembly and determine why the bearings failed.

Conversation Summary

The owner of a 1994 Toyota 4Runner 3.0 spun a rod bearing and asked whether the bearings could be replaced without removing the engine, how to check for crank damage, and whether remaining soft bearing material meant the crank was still protected. The owner had already installed the wrong-size bearings. The expert advised using Plastigage to measure clearance, inspecting for a bent, tapered, or out-of-round crank, and using a crank kit as the proper repair while keeping the assembly clean.

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