Name: ACL Mitsubishi 4D30 4D30A 4D31 4D31 4D34 Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-mitsubishi-4d30-4d30a-4d31-4d31-4d34-engine-crankshaft-main-bearing-set-t14-632271
Price: 23.37 USD
Availability: BackOrder

Question 1

What does 'undersize' mean?

Accepted Answer

When an engine is rebuilt, the crankshaft journals may be ground down to remove damage. Undersize bearings compensate for this material removal, maintaining the correct oil clearance. Always measure your journals before selecting a bearing size.

Question 2

What other parts should I replace when replacing my main bearings?

Accepted Answer

At a minimum, you should always replace your connecting rod bearings at the same time as your main bearings. It's also best practice to inspect the crankshaft for wear and have it machined if necessary. Don't forget new main cap bolts.

Question 3

How do I know if my main bearings need replacing?

Accepted Answer

Common signs of worn main bearings include low oil pressure, a knocking sound from the bottom of the engine, and the presence of metal flakes in the oil. If you experience any of these symptoms, it's important to have your engine inspected by a professional.

Specifications

ACL Mitsubishi 4D30 4D30A 4D31 4D31 4D34 Engine Crankshaft Main Bearing Set

Key Features

Specifications

Frequently Asked Questions

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