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How to check for warping on a Mitsubishi 4B12 cylinder head before gasket installation? | WTA Guide

2025-06-03

Table of Contents

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How to Check for Warping on a Mitsubishi 4B12 Cylinder Head Before Gasket Installation
What Tools Are Needed to Check for Cylinder Head Warping?
How Do You Prepare the Cylinder Head for Inspection?
What Is the Step-by-Step Method for Checking Warping?
What Are the Acceptable Warpage Tolerances for the 4B12 Cylinder Head?
What Should Be Done if Warping Exceeds Specification?

Discover expert tips to detect and address warping on Mitsubishi 4B12 cylinder heads before gasket installation. Essential for engine sealing pros. WTA

How to Check for Warping on a Mitsubishi 4B12 Cylinder Head Before Gasket Installation

What Tools Are Needed to Check for Cylinder Head Warping?

To accurately check for warping on a Mitsubishi 4B12 cylinder head, you need a precision straight edge (preferably at least 600 mm in length) and feeler gauges. Ensure both tools are clean and free from debris for precise measurements.

How Do You Prepare the Cylinder Head for Inspection?

Thoroughly clean the cylinder head surface, removing all gasket residue, oil, and deposits. Rest the head on a flat, stable surface. Ensure it is at room temperature to avoid thermal expansion or contraction affecting the results.

What Is the Step-by-Step Method for Checking Warping?

Place the straight edge diagonally, and then along the length and width of the cylinder head deck surface. Slide feeler gauges between the straight edge and the cylinder head at various points. Record the largest gap found; this indicates the amount of warping.

What Are the Acceptable Warpage Tolerances for the 4B12 Cylinder Head?

For the Mitsubishi 4B12 engine, the allowable warpage is typically 0.05 mm (0.002 in) maximum. Consult your service manual for the precise spec. If the warpage exceeds this value, the head must be resurfaced before gasket installation.

What Should Be Done if Warping Exceeds Specification?

If warping is greater than the acceptable tolerance, send the cylinder head to a professional machine shop for resurfacing. Installing a head gasket on a warped head can lead to sealing failures and engine damage.

Conclusion: Checking for warping is essential in ensuring a proper seal and preventing costly engine repairs. Always measure carefully and address any irregularities before installing a new gasket.

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